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<h3>
Ben Gamari pushed to branch wip/m32-fixes
at <a href="https://gitlab.haskell.org/ghc/ghc">Glasgow Haskell Compiler / GHC</a>
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<h4>
Commits:
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<ul>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/52cf9952776b551a4dbed418c1276df73e7427a2">52cf9952</a></strong>
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<span>by Ben Gamari</span>
<i>at 2020-11-23T16:48:28-05:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts/m32: Refactor handling of allocator seeding
Previously, in an attempt to reduce fragmentation, each new allocator
would map a region of M32_MAX_PAGES fresh pages to seed itself. However,
this ends up being extremely wasteful since it turns out that we often
use fewer than this. Consequently, these pages end up getting freed
which, ends up fragmenting our address space more than than we would
have if we had naively allocated pages on-demand.
Here we refactor m32 to avoid this waste while achieving the
fragmentation mitigation previously desired. In particular, we move all
page allocation into the global m32_alloc_page, which will pull a page
from the free page pool. If the free page pool is empty we then refill
it by allocating a region of M32_MAP_PAGES and adding them to the pool.
Furthermore, we do away with the initial seeding entirely. That is, the
allocator starts with no active pages: pages are rather allocated on an
as-needed basis.
On the whole this ends up being a pleasingly simple change,
simultaneously making m32 more efficient, more robust, and simpler.
Fixes #18980.
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<h4>1 changed file:</h4>
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<a href="#ff22a2ef046b1fcf2beee0d03afebc155405a6d3">
rts/linker/M32Alloc.c
</a>
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<h4>Changes:</h4>
<li id="ff22a2ef046b1fcf2beee0d03afebc155405a6d3">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/52cf9952776b551a4dbed418c1276df73e7427a2#ff22a2ef046b1fcf2beee0d03afebc155405a6d3"><strong>rts/linker/M32Alloc.c</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -81,6 +81,7 @@ The allocator manages two kinds of allocations:</td>
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<pre style="margin: 0;"> <span id="LC81" class="line" lang="c"></span>
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<pre style="margin: 0;"> <span id="LC82" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * small allocations, which are allocated into a set of "nursery" pages</span></span>
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<pre style="margin: 0;"> <span id="LC83" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> (recorded in m32_allocator_t.pages; the size of the set is <= M32_MAX_PAGES)</span></span>
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<pre style="margin: 0;">+<span id="LC84" class="line" lang="c"></span>
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<pre style="margin: 0;"> <span id="LC85" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * large allocations are those larger than a page and are mapped directly</span></span>
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<pre style="margin: 0;"> <span id="LC86" class="line" lang="c"></span>
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<pre style="margin: 0;"> <span id="LC87" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;">Each page (or the first page of a large allocation) begins with a m32_page_t</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="126" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="diff-line-num unfold js-unfold new_line" data-linenumber="127" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -126,7 +127,9 @@ code accordingly).</td>
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<pre style="margin: 0;"> <span id="LC127" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;">To avoid unnecessary mapping/unmapping we maintain a global list of free pages</span></span>
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<pre style="margin: 0;"> <span id="LC128" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;">(which can grow up to M32_MAX_FREE_PAGE_POOL_SIZE long). Pages on this list</span></span>
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<pre style="margin: 0;"> <span id="LC129" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;">have the usual m32_page_t header and are linked together with</span></span>
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<pre style="margin: 0;">-<span id="LC129" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;">m32_page_t.free_page.next.</span></span>
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<pre style="margin: 0;">+<span id="LC130" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;">m32_page_t.free_page.next. When run out of free pages we allocate a chunk of</span></span>
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<pre style="margin: 0;">+<span id="LC131" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;">M32_MAP_PAGES to both avoid fragmenting our address space and amortize the</span></span>
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<pre style="margin: 0;">+<span id="LC132" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;">runtime cost of the mapping.</span></span>
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<pre style="margin: 0;"> <span id="LC133" class="line" lang="c"></span>
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<pre style="margin: 0;"> <span id="LC134" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;">The allocator is *not* thread-safe.</span></span>
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<pre style="margin: 0;"> <span id="LC135" class="line" lang="c"></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="142" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -139,7 +142,12 @@ The allocator is *not* thread-safe.</td>
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<pre style="margin: 0;"> <span id="LC142" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * M32 ALLOCATOR (see Note [M32 Allocator]</span></span>
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<pre style="margin: 0;"> <span id="LC143" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> ***************************************************************************/</span></span>
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<pre style="margin: 0;"> <span id="LC144" class="line" lang="c"></span>
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<pre style="margin: 0;">+<span id="LC145" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;">/* How many open pages each allocator will keep around? */</span></span>
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142
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146
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<pre style="margin: 0;"> <span id="LC146" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#define M32_MAX_PAGES 32</span></span>
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<td class="diff-line-num new new_line" data-linenumber="147" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
147
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<pre style="margin: 0;">+<span id="LC147" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;">/* How many pages should we map at once when re-filling the free page pool? */</span></span>
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148
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<pre style="margin: 0;">+<span id="LC148" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#define M32_MAP_PAGES 32</span></span>
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149
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<pre style="margin: 0;">+<span id="LC149" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;">/* Upper bound on the number of pages to keep in the free page pool */</span></span>
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150
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<pre style="margin: 0;">+<span id="LC150" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#define M32_MAX_FREE_PAGE_POOL_SIZE 64</span></span>
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143
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151
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<pre style="margin: 0;"> <span id="LC151" class="line" lang="c"></span>
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144
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<pre style="margin: 0;"> <span id="LC152" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;">/**</span></span>
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<pre style="margin: 0;"> <span id="LC153" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * Page header</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="204" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="diff-line-num unfold js-unfold new_line" data-linenumber="212" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -204,7 +212,6 @@ struct m32_allocator_t {</td>
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204
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212
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<pre style="margin: 0;"> <span id="LC212" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> *</span></span>
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<pre style="margin: 0;"> <span id="LC213" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * We keep a small pool of free pages around to avoid fragmentation.</span></span>
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<pre style="margin: 0;"> <span id="LC214" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> */</span></span>
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207
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<pre style="margin: 0;">-<span id="LC207" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#define M32_MAX_FREE_PAGE_POOL_SIZE 16</span></span>
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208
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<pre style="margin: 0;"> <span id="LC215" class="line" lang="c"><span class="k" style="font-weight: 600;">struct</span> <span class="n" style="color: #333;">m32_page_t</span> <span class="o" style="font-weight: 600;">*</span><span class="n" style="color: #333;">m32_free_page_pool</span> <span class="o" style="font-weight: 600;">=</span> <span class="nb" style="color: #0086b3;">NULL</span><span class="p">;</span></span>
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209
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<pre style="margin: 0;"> <span id="LC216" class="line" lang="c"><span class="kt" style="color: #458; font-weight: 600;">unsigned</span> <span class="kt" style="color: #458; font-weight: 600;">int</span> <span class="n" style="color: #333;">m32_free_page_pool_size</span> <span class="o" style="font-weight: 600;">=</span> <span class="mi" style="color: #099;">0</span><span class="p">;</span></span>
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210
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217
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<pre style="margin: 0;"> <span id="LC217" class="line" lang="c"><span class="c1" style="color: #998; font-style: italic;">// TODO</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="250" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="diff-line-num unfold js-unfold new_line" data-linenumber="257" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -250,18 +257,33 @@ m32_release_page(struct m32_page_t *page)</td>
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250
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<pre style="margin: 0;"> <span id="LC257" class="line" lang="c"><span class="k" style="font-weight: 600;">static</span> <span class="k" style="font-weight: 600;">struct</span> <span class="n" style="color: #333;">m32_page_t</span> <span class="o" style="font-weight: 600;">*</span></span>
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251
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<pre style="margin: 0;"> <span id="LC258" class="line" lang="c"><span class="nf" style="color: #900; font-weight: 600;">m32_alloc_page</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">void</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC259" class="line" lang="c"><span class="p">{</span></span>
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253
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<pre style="margin: 0;">-<span id="LC253" class="line" lang="c"> <span class="k" style="font-weight: 600;">if</span> <span class="p">(</span><span class="n" style="color: #333;">m32_free_page_pool_size</span> <span class="o" style="font-weight: 600;"><span class="idiff left right">></span></span> <span class="mi" style="color: #099;">0</span><span class="p">)</span> <span class="p">{</span></span>
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254
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<pre style="margin: 0;">-<span id="LC254" class="line" lang="c"> <span class="k" style="font-weight: 600;"><span class="idiff left">struct</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">m32_page_t</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">*</span></span><span class="n" style="color: #333;"><span class="idiff">page</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">m32_free_page_pool</span></span><span class="p"><span class="idiff right">;</span></span></span>
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<pre style="margin: 0;">-<span id="LC255" class="line" lang="c"> <span class="n" style="color: #333;"><span class="idiff left">m32_free_page_pool</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">page</span></span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="n" style="color: #333;"><span class="idiff">free_page</span></span><span class="p"><span class="idiff">.</span></span><span class="n" style="color: #333;"><span class="idiff">next</span></span><span class="p"><span class="idiff right">;</span></span></span>
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256
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<pre style="margin: 0;">-<span id="LC256" class="line" lang="c"> <span class="n" style="color: #333;"><span class="idiff left">m32_free_page_pool_size</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">--</span></span><span class="p"><span class="idiff right">;</span></span></span>
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257
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<pre style="margin: 0;">-<span id="LC257" class="line" lang="c"> <span class="k" style="font-weight: 600;"><span class="idiff left">return</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">page</span></span><span class="p"><span class="idiff right">;</span></span></span>
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258
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<pre style="margin: 0;">-<span id="LC258" class="line" lang="c"> <span class="p"><span class="idiff left">}</span></span><span class="idiff"> </span><span class="k" style="font-weight: 600;"><span class="idiff">else</span></span><span class="idiff"> </span><span class="p"><span class="idiff right">{</span></span></span>
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259
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<pre style="margin: 0;">-<span id="LC259" class="line" lang="c"> <span class="k" style="font-weight: 600;"><span class="idiff left">struct</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">m32_page_t</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">*</span></span><span class="n" style="color: #333;"><span class="idiff">page</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">mmapForLinker</span></span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">getPageSize</span></span><span class="p"><span class="idiff right">()</span>,</span> <span class="n" style="color: #333;">PROT_READ</span> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">PROT_WRITE</span><span class="p">,</span> <span class="n" style="color: #333;">MAP_ANONYMOUS</span><span class="p">,</span> <span class="o" style="font-weight: 600;">-</span><span class="mi" style="color: #099;">1</span><span class="p">,</span> <span class="mi" style="color: #099;">0</span><span class="p">);</span></span>
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260
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<pre style="margin: 0;">-<span id="LC260" class="line" lang="c"> <span class="k" style="font-weight: 600;">if</span> <span class="p">(</span><span class="n" style="color: #333;"><span class="idiff left">page</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">></span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="k" style="font-weight: 600;"><span class="idiff">struct</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">m32_page_t</span></span> <span class="o" style="font-weight: 600;">*</span><span class="p">)</span> <span class="mh" style="color: #099;">0xffffffff</span><span class="p">)</span> <span class="p">{</span></span>
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260
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<pre style="margin: 0;">+<span id="LC260" class="line" lang="c"> <span class="k" style="font-weight: 600;">if</span> <span class="p">(</span><span class="n" style="color: #333;">m32_free_page_pool_size</span> <span class="o" style="font-weight: 600;"><span class="idiff left right">==</span></span> <span class="mi" style="color: #099;">0</span><span class="p">)</span> <span class="p">{</span></span>
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261
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<pre style="margin: 0;">+<span id="LC261" class="line" lang="c"> <span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">/*</span></span></span>
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<td class="diff-line-num new new_line" data-linenumber="262" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
262
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<pre style="margin: 0;">+<span id="LC262" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> <span class="idiff left right"> * Free page pool is empty; refill it with a new batch of M32_MAP_PAGES</span></span></span>
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<td class="diff-line-num new new_line" data-linenumber="263" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
263
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<pre style="margin: 0;">+<span id="LC263" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> <span class="idiff left right"> * pages.</span></span></span>
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264
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<pre style="margin: 0;">+<span id="LC264" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> <span class="idiff left right"> */</span></span></span>
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<td class="diff-line-num new new_line" data-linenumber="265" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
265
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<pre style="margin: 0;">+<span id="LC265" class="line" lang="c"> <span class="idiff left"> </span><span class="k" style="font-weight: 600;"><span class="idiff">const</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">size_t</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">pgsz</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">getPageSize</span></span><span class="p"><span class="idiff right">();</span></span></span>
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<td class="diff-line-num new new_line" data-linenumber="266" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
266
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<pre style="margin: 0;">+<span id="LC266" class="line" lang="c"> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">char</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">*</span></span><span class="n" style="color: #333;"><span class="idiff">chunk</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">mmapForLinker</span></span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">pgsz</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">*</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">M32_MAP_PAGES</span></span><span class="p">,</span> <span class="n" style="color: #333;">PROT_READ</span> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">PROT_WRITE</span><span class="p">,</span> <span class="n" style="color: #333;">MAP_ANONYMOUS</span><span class="p">,</span> <span class="o" style="font-weight: 600;">-</span><span class="mi" style="color: #099;">1</span><span class="p">,</span> <span class="mi" style="color: #099;">0</span><span class="p">);</span></span>
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<td class="diff-line-num new new_line" data-linenumber="267" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
267
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<pre style="margin: 0;">+<span id="LC267" class="line" lang="c"> <span class="k" style="font-weight: 600;">if</span> <span class="p">(</span><span class="n" style="color: #333;"><span class="idiff left">chunk</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">></span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">char</span></span> <span class="o" style="font-weight: 600;">*</span><span class="p">)</span> <span class="mh" style="color: #099;">0xffffffff</span><span class="p">)</span> <span class="p">{</span></span>
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261
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268
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<pre style="margin: 0;"> <span id="LC268" class="line" lang="c"> <span class="n" style="color: #333;">barf</span><span class="p">(</span><span class="s" style="color: #d14;">"m32_alloc_page: failed to get allocation in lower 32-bits"</span><span class="p">);</span></span>
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262
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269
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<pre style="margin: 0;"> <span id="LC269" class="line" lang="c"> <span class="p">}</span></span>
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263
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<pre style="margin: 0;">-<span id="LC263" class="line" lang="c"> <span class="k" style="font-weight: 600;">return</span> <span class="n" style="color: #333;">page</span><span class="p">;</span></span>
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270
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<pre style="margin: 0;">+<span id="LC270" class="line" lang="c"></span>
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<td class="diff-line-num new new_line" data-linenumber="271" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
271
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<pre style="margin: 0;">+<span id="LC271" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#define GET_PAGE(i) ((struct m32_page_t *) (chunk + (i) * pgsz))</span></span>
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272
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<pre style="margin: 0;">+<span id="LC272" class="line" lang="c"> <span class="k" style="font-weight: 600;">for</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">int</span> <span class="n" style="color: #333;">i</span><span class="o" style="font-weight: 600;">=</span><span class="mi" style="color: #099;">0</span><span class="p">;</span> <span class="n" style="color: #333;">i</span> <span class="o" style="font-weight: 600;"><</span> <span class="n" style="color: #333;">M32_MAP_PAGES</span><span class="p">;</span> <span class="n" style="color: #333;">i</span><span class="o" style="font-weight: 600;">++</span><span class="p">)</span> <span class="p">{</span></span>
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<td class="diff-line-num new new_line" data-linenumber="273" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
273
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<pre style="margin: 0;">+<span id="LC273" class="line" lang="c"> <span class="k" style="font-weight: 600;">struct</span> <span class="n" style="color: #333;">m32_page_t</span> <span class="o" style="font-weight: 600;">*</span><span class="n" style="color: #333;">page</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">GET_PAGE</span><span class="p">(</span><span class="n" style="color: #333;">i</span><span class="p">);</span></span>
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<td class="diff-line-num new new_line" data-linenumber="274" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
274
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<pre style="margin: 0;">+<span id="LC274" class="line" lang="c"> <span class="n" style="color: #333;">page</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">free_page</span><span class="p">.</span><span class="n" style="color: #333;">next</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">GET_PAGE</span><span class="p">(</span><span class="n" style="color: #333;">i</span><span class="o" style="font-weight: 600;">+</span><span class="mi" style="color: #099;">1</span><span class="p">);</span></span>
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275
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<pre style="margin: 0;">+<span id="LC275" class="line" lang="c"> <span class="p">}</span></span>
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276
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<pre style="margin: 0;">+<span id="LC276" class="line" lang="c"></span>
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<td class="diff-line-num new new_line" data-linenumber="277" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
277
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<pre style="margin: 0;">+<span id="LC277" class="line" lang="c"> <span class="n" style="color: #333;">GET_PAGE</span><span class="p">(</span><span class="n" style="color: #333;">M32_MAP_PAGES</span><span class="o" style="font-weight: 600;">-</span><span class="mi" style="color: #099;">1</span><span class="p">)</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">free_page</span><span class="p">.</span><span class="n" style="color: #333;">next</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">m32_free_page_pool</span><span class="p">;</span></span>
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<td class="diff-line-num new new_line" data-linenumber="278" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
278
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<pre style="margin: 0;">+<span id="LC278" class="line" lang="c"> <span class="n" style="color: #333;">m32_free_page_pool</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="k" style="font-weight: 600;">struct</span> <span class="n" style="color: #333;">m32_page_t</span> <span class="o" style="font-weight: 600;">*</span><span class="p">)</span> <span class="n" style="color: #333;">chunk</span><span class="p">;</span></span>
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<td class="diff-line-num new new_line" data-linenumber="279" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
279
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<pre style="margin: 0;">+<span id="LC279" class="line" lang="c"> <span class="n" style="color: #333;">m32_free_page_pool_size</span> <span class="o" style="font-weight: 600;">+=</span> <span class="n" style="color: #333;">M32_MAP_PAGES</span><span class="p">;</span></span>
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280
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<pre style="margin: 0;">+<span id="LC280" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#undef GET_PAGE</span></span>
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264
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281
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<pre style="margin: 0;"> <span id="LC281" class="line" lang="c"> <span class="p">}</span></span>
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282
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<pre style="margin: 0;">+<span id="LC282" class="line" lang="c"></span>
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<td class="diff-line-num new new_line" data-linenumber="283" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
283
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<pre style="margin: 0;">+<span id="LC283" class="line" lang="c"> <span class="k" style="font-weight: 600;">struct</span> <span class="n" style="color: #333;">m32_page_t</span> <span class="o" style="font-weight: 600;">*</span><span class="n" style="color: #333;">page</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">m32_free_page_pool</span><span class="p">;</span></span>
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<td class="diff-line-num new new_line" data-linenumber="284" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
284
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<pre style="margin: 0;">+<span id="LC284" class="line" lang="c"> <span class="n" style="color: #333;">m32_free_page_pool</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">page</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">free_page</span><span class="p">.</span><span class="n" style="color: #333;">next</span><span class="p">;</span></span>
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<td class="diff-line-num new new_line" data-linenumber="285" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
285
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<pre style="margin: 0;">+<span id="LC285" class="line" lang="c"> <span class="n" style="color: #333;">m32_free_page_pool_size</span> <span class="o" style="font-weight: 600;">--</span><span class="p">;</span></span>
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286
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<pre style="margin: 0;">+<span id="LC286" class="line" lang="c"> <span class="k" style="font-weight: 600;">return</span> <span class="n" style="color: #333;">page</span><span class="p">;</span></span>
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265
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287
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<pre style="margin: 0;"> <span id="LC287" class="line" lang="c"><span class="p">}</span></span>
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288
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<pre style="margin: 0;"> <span id="LC288" class="line" lang="c"></span>
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267
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289
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<pre style="margin: 0;"> <span id="LC289" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;">/**</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="276" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="diff-line-num unfold js-unfold new_line" data-linenumber="298" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -276,19 +298,6 @@ m32_allocator_new(bool executable)</td>
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276
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298
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<pre style="margin: 0;"> <span id="LC298" class="line" lang="c"> <span class="n" style="color: #333;">stgMallocBytes</span><span class="p">(</span><span class="k" style="font-weight: 600;">sizeof</span><span class="p">(</span><span class="n" style="color: #333;">m32_allocator</span><span class="p">),</span> <span class="s" style="color: #d14;">"m32_new_allocator"</span><span class="p">);</span></span>
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277
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299
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<pre style="margin: 0;"> <span id="LC299" class="line" lang="c"> <span class="n" style="color: #333;">memset</span><span class="p">(</span><span class="n" style="color: #333;">alloc</span><span class="p">,</span> <span class="mi" style="color: #099;">0</span><span class="p">,</span> <span class="k" style="font-weight: 600;">sizeof</span><span class="p">(</span><span class="k" style="font-weight: 600;">struct</span> <span class="n" style="color: #333;">m32_allocator_t</span><span class="p">));</span></span>
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278
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<pre style="margin: 0;"> <span id="LC300" class="line" lang="c"> <span class="n" style="color: #333;">alloc</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">executable</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">executable</span><span class="p">;</span></span>
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<pre style="margin: 0;">-<span id="LC279" class="line" lang="c"></span>
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<pre style="margin: 0;">-<span id="LC280" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// Preallocate the initial M32_MAX_PAGES to ensure that they don't</span></span>
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<pre style="margin: 0;">-<span id="LC281" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// fragment the memory.</span></span>
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<pre style="margin: 0;">-<span id="LC282" class="line" lang="c"> <span class="kt" style="color: #458; font-weight: 600;">size_t</span> <span class="n" style="color: #333;">pgsz</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">getPageSize</span><span class="p">();</span></span>
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<pre style="margin: 0;">-<span id="LC283" class="line" lang="c"> <span class="kt" style="color: #458; font-weight: 600;">char</span><span class="o" style="font-weight: 600;">*</span> <span class="n" style="color: #333;">bigchunk</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mmapForLinker</span><span class="p">(</span><span class="n" style="color: #333;">pgsz</span> <span class="o" style="font-weight: 600;">*</span> <span class="n" style="color: #333;">M32_MAX_PAGES</span><span class="p">,</span> <span class="n" style="color: #333;">PROT_READ</span> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">PROT_WRITE</span><span class="p">,</span> <span class="n" style="color: #333;">MAP_ANONYMOUS</span><span class="p">,</span><span class="o" style="font-weight: 600;">-</span><span class="mi" style="color: #099;">1</span><span class="p">,</span><span class="mi" style="color: #099;">0</span><span class="p">);</span></span>
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<pre style="margin: 0;">-<span id="LC284" class="line" lang="c"> <span class="k" style="font-weight: 600;">if</span> <span class="p">(</span><span class="n" style="color: #333;">bigchunk</span> <span class="o" style="font-weight: 600;">==</span> <span class="nb" style="color: #0086b3;">NULL</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC285" class="line" lang="c"> <span class="n" style="color: #333;">barf</span><span class="p">(</span><span class="s" style="color: #d14;">"m32_allocator_init: Failed to map"</span><span class="p">);</span></span>
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<pre style="margin: 0;">-<span id="LC286" class="line" lang="c"></span>
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<pre style="margin: 0;">-<span id="LC287" class="line" lang="c"> <span class="kt" style="color: #458; font-weight: 600;">int</span> <span class="n" style="color: #333;">i</span><span class="p">;</span></span>
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288
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<pre style="margin: 0;">-<span id="LC288" class="line" lang="c"> <span class="k" style="font-weight: 600;">for</span> <span class="p">(</span><span class="n" style="color: #333;">i</span><span class="o" style="font-weight: 600;">=</span><span class="mi" style="color: #099;">0</span><span class="p">;</span> <span class="n" style="color: #333;">i</span><span class="o" style="font-weight: 600;"><</span><span class="n" style="color: #333;">M32_MAX_PAGES</span><span class="p">;</span> <span class="n" style="color: #333;">i</span><span class="o" style="font-weight: 600;">++</span><span class="p">)</span> <span class="p">{</span></span>
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289
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<pre style="margin: 0;">-<span id="LC289" class="line" lang="c"> <span class="n" style="color: #333;">alloc</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">pages</span><span class="p">[</span><span class="n" style="color: #333;">i</span><span class="p">]</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="k" style="font-weight: 600;">struct</span> <span class="n" style="color: #333;">m32_page_t</span> <span class="o" style="font-weight: 600;">*</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">bigchunk</span> <span class="o" style="font-weight: 600;">+</span> <span class="n" style="color: #333;">i</span><span class="o" style="font-weight: 600;">*</span><span class="n" style="color: #333;">pgsz</span><span class="p">);</span></span>
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<pre style="margin: 0;">-<span id="LC290" class="line" lang="c"> <span class="n" style="color: #333;">alloc</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">pages</span><span class="p">[</span><span class="n" style="color: #333;">i</span><span class="p">]</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">current_size</span> <span class="o" style="font-weight: 600;">=</span> <span class="k" style="font-weight: 600;">sizeof</span><span class="p">(</span><span class="k" style="font-weight: 600;">struct</span> <span class="n" style="color: #333;">m32_page_t</span><span class="p">);</span></span>
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<pre style="margin: 0;">-<span id="LC291" class="line" lang="c"> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC301" class="line" lang="c"> <span class="k" style="font-weight: 600;">return</span> <span class="n" style="color: #333;">alloc</span><span class="p">;</span></span>
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<pre style="margin: 0;"> <span id="LC302" class="line" lang="c"><span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC303" class="line" lang="c"></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -350,7 +359,9 @@ m32_allocator_push_filled_list(struct m32_page_t **head, struct m32_page_t *page</td>
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<pre style="margin: 0;"> <span id="LC359" class="line" lang="c"><span class="kt" style="color: #458; font-weight: 600;">void</span></span>
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351
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<pre style="margin: 0;"> <span id="LC360" class="line" lang="c"><span class="nf" style="color: #900; font-weight: 600;">m32_allocator_flush</span><span class="p">(</span><span class="n" style="color: #333;">m32_allocator</span> <span class="o" style="font-weight: 600;">*</span><span class="n" style="color: #333;">alloc</span><span class="p">)</span> <span class="p">{</span></span>
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352
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361
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<pre style="margin: 0;"> <span id="LC361" class="line" lang="c"> <span class="k" style="font-weight: 600;">for</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">int</span> <span class="n" style="color: #333;">i</span><span class="o" style="font-weight: 600;">=</span><span class="mi" style="color: #099;">0</span><span class="p">;</span> <span class="n" style="color: #333;">i</span><span class="o" style="font-weight: 600;"><</span><span class="n" style="color: #333;">M32_MAX_PAGES</span><span class="p">;</span> <span class="n" style="color: #333;">i</span><span class="o" style="font-weight: 600;">++</span><span class="p">)</span> <span class="p">{</span></span>
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<pre style="margin: 0;">-<span id="LC353" class="line" lang="c"> <span class="k" style="font-weight: 600;">if</span> <span class="p">(</span><span class="n" style="color: #333;">alloc</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">pages</span><span class="p">[</span><span class="n" style="color: #333;">i</span><span class="p">]</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">current_size</span> <span class="o" style="font-weight: 600;">==</span> <span class="k" style="font-weight: 600;">sizeof</span><span class="p">(</span><span class="k" style="font-weight: 600;">struct</span> <span class="n" style="color: #333;">m32_page_t</span><span class="p">))</span> <span class="p">{</span></span>
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<pre style="margin: 0;">+<span id="LC362" class="line" lang="c"> <span class="k" style="font-weight: 600;">if</span> <span class="p">(</span><span class="n" style="color: #333;">alloc</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">pages</span><span class="p">[</span><span class="n" style="color: #333;">i</span><span class="p">]</span> <span class="o" style="font-weight: 600;">==</span> <span class="nb" style="color: #0086b3;">NULL</span><span class="p">)</span> <span class="p">{</span></span>
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<pre style="margin: 0;">+<span id="LC363" class="line" lang="c"> <span class="k" style="font-weight: 600;">continue</span><span class="p">;</span></span>
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<pre style="margin: 0;">+<span id="LC364" class="line" lang="c"> <span class="p">}</span> <span class="k" style="font-weight: 600;">else</span> <span class="k" style="font-weight: 600;">if</span> <span class="p">(</span><span class="n" style="color: #333;">alloc</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">pages</span><span class="p">[</span><span class="n" style="color: #333;">i</span><span class="p">]</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">current_size</span> <span class="o" style="font-weight: 600;">==</span> <span class="k" style="font-weight: 600;">sizeof</span><span class="p">(</span><span class="k" style="font-weight: 600;">struct</span> <span class="n" style="color: #333;">m32_page_t</span><span class="p">))</span> <span class="p">{</span></span>
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<pre style="margin: 0;"> <span id="LC365" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// the page is empty, free it</span></span>
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<pre style="margin: 0;"> <span id="LC366" class="line" lang="c"> <span class="n" style="color: #333;">m32_release_page</span><span class="p">(</span><span class="n" style="color: #333;">alloc</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">pages</span><span class="p">[</span><span class="n" style="color: #333;">i</span><span class="p">]);</span></span>
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<pre style="margin: 0;"> <span id="LC367" class="line" lang="c"> <span class="p">}</span> <span class="k" style="font-weight: 600;">else</span> <span class="p">{</span></span>
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