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<h3>
Ben Gamari pushed to branch wip/gc/nonmoving-pinned
at <a href="https://gitlab.haskell.org/ghc/ghc">Glasgow Haskell Compiler / GHC</a>
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<h4>
Commits:
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<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d64deb00785523ee77b84be96ecceb4f44f46303">d64deb00</a></strong>
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<span>by Ben Gamari</span>
<i>at 2020-07-26T15:36:57-04:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">nonmoving: Teach allocatePinned() to allocate into nonmoving heap
The allocatePinned() function is used to allocate pinned memory (e.g.
for newPinnedByteArray#)
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<h4>2 changed files:</h4>
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<a href="#371d3c3c9fad484c1163aa733d70507ce33084c9">
rts/sm/NonMoving.h
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<a href="#0bfe9d4217bccddd6b00d2d6a5e56e7de4c86273">
rts/sm/Storage.c
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<h4>Changes:</h4>
<li id="371d3c3c9fad484c1163aa733d70507ce33084c9">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d64deb00785523ee77b84be96ecceb4f44f46303#371d3c3c9fad484c1163aa733d70507ce33084c9"><strong>rts/sm/NonMoving.h</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">@@ -73,11 +73,17 @@ struct NonmovingAllocator {</td>
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<pre style="margin: 0;"> <span id="LC73" class="line" lang="c"></span>
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<pre style="margin: 0;"> <span id="LC74" class="line" lang="c"><span class="c1" style="color: #998; font-style: italic;">// allocators cover block sizes of 2^NONMOVING_ALLOCA0 to</span></span>
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<pre style="margin: 0;"> <span id="LC75" class="line" lang="c"><span class="c1" style="color: #998; font-style: italic;">// 2^(NONMOVING_ALLOCA0 + NONMOVING_ALLOCA_CNT) (in bytes)</span></span>
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<pre style="margin: 0;">+<span id="LC76" class="line" lang="c"><span class="c1" style="color: #998; font-style: italic;">// The largest allocator class must be at least LARGE_OBJECT_THRESHOLD in size</span></span>
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<pre style="margin: 0;">+<span id="LC77" class="line" lang="c"><span class="c1" style="color: #998; font-style: italic;">// as Storage.c:allocatePinned will allocate small pinned allocations into the</span></span>
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<pre style="margin: 0;">+<span id="LC78" class="line" lang="c"><span class="c1" style="color: #998; font-style: italic;">// non-moving heap.</span></span>
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<pre style="margin: 0;"> <span id="LC79" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#define NONMOVING_ALLOCA_CNT 12</span></span>
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<pre style="margin: 0;"> <span id="LC80" class="line" lang="c"></span>
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<pre style="margin: 0;"> <span id="LC81" class="line" lang="c"><span class="c1" style="color: #998; font-style: italic;">// maximum number of free segments to hold on to</span></span>
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<pre style="margin: 0;"> <span id="LC82" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#define NONMOVING_MAX_FREE 16</span></span>
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<pre style="margin: 0;"> <span id="LC83" class="line" lang="c"></span>
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<pre style="margin: 0;">+<span id="LC84" class="line" lang="c"><span class="c1" style="color: #998; font-style: italic;">// block size of largest allocator in bytes.</span></span>
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<pre style="margin: 0;">+<span id="LC85" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#define NONMOVING_MAX_BLOCK_SZ (1 << (NONMOVING_ALLOCA0 + NONMOVING_ALLOCA_CNT))</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="k" style="font-weight: 600;">struct</span> <span class="n" style="color: #333;">NonmovingHeap</span> <span class="p">{</span></span>
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<pre style="margin: 0;"> <span id="LC88" class="line" lang="c"> <span class="k" style="font-weight: 600;">struct</span> <span class="n" style="color: #333;">NonmovingAllocator</span> <span class="o" style="font-weight: 600;">*</span><span class="n" style="color: #333;">allocators</span><span class="p">[</span><span class="n" style="color: #333;">NONMOVING_ALLOCA_CNT</span><span class="p">];</span></span>
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<pre style="margin: 0;"> <span id="LC89" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// free segment list. This is a cache where we keep up to</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d64deb00785523ee77b84be96ecceb4f44f46303#0bfe9d4217bccddd6b00d2d6a5e56e7de4c86273"><strong>rts/sm/Storage.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">@@ -1165,6 +1165,21 @@ allocatePinned (Capability *cap, W_ n /*words*/, W_ alignment /*bytes*/, W_ alig</td>
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<pre style="margin: 0;"> <span id="LC1165" class="line" lang="c"></span>
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<pre style="margin: 0;"> <span id="LC1166" class="line" lang="c"> <span class="k" style="font-weight: 600;">const</span> <span class="n" style="color: #333;">StgWord</span> <span class="n" style="color: #333;">alignment_w</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">alignment</span> <span class="o" style="font-weight: 600;">/</span> <span class="k" style="font-weight: 600;">sizeof</span><span class="p">(</span><span class="n" style="color: #333;">W_</span><span class="p">);</span></span>
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<pre style="margin: 0;"> <span id="LC1167" class="line" lang="c"></span>
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1168
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<pre style="margin: 0;">+<span id="LC1168" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// If the non-moving collector is enabled then we can allocate small,</span></span>
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1169
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<pre style="margin: 0;">+<span id="LC1169" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// pinned allocations directly into the non-moving heap. This is a bit more</span></span>
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1170
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<pre style="margin: 0;">+<span id="LC1170" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// expensive up-front but reduces fragmentation and is worthwhile since</span></span>
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1171
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<pre style="margin: 0;">+<span id="LC1171" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// pinned allocations are often long-lived..</span></span>
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1172
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<pre style="margin: 0;">+<span id="LC1172" class="line" lang="c"> <span class="k" style="font-weight: 600;">if</span> <span class="p">(</span><span class="n" style="color: #333;">RTS_UNLIKELY</span><span class="p">(</span><span class="n" style="color: #333;">RtsFlags</span><span class="p">.</span><span class="n" style="color: #333;">GcFlags</span><span class="p">.</span><span class="n" style="color: #333;">use_nonmoving</span><span class="p">)</span></span>
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1173
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<pre style="margin: 0;">+<span id="LC1173" class="line" lang="c"> <span class="o" style="font-weight: 600;">&&</span> <span class="n" style="color: #333;">n</span> <span class="o" style="font-weight: 600;">*</span> <span class="n" style="color: #333;">WORD_SIZE</span> <span class="o" style="font-weight: 600;">+</span> <span class="n" style="color: #333;">alignment_w</span> <span class="o" style="font-weight: 600;"><=</span> <span class="n" style="color: #333;">NONMOVING_MAX_BLOCK_SZ</span><span class="p">)</span></span>
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1174
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<pre style="margin: 0;">+<span id="LC1174" class="line" lang="c"> <span class="p">{</span></span>
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1175
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<pre style="margin: 0;">+<span id="LC1175" class="line" lang="c"> <span class="n" style="color: #333;">p</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">nonmovingAllocate</span><span class="p">(</span><span class="n" style="color: #333;">cap</span><span class="p">,</span> <span class="n" style="color: #333;">n</span> <span class="o" style="font-weight: 600;">+</span> <span class="n" style="color: #333;">alignment_w</span><span class="p">);</span></span>
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1176
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<pre style="margin: 0;">+<span id="LC1176" class="line" lang="c"> <span class="n" style="color: #333;">W_</span> <span class="n" style="color: #333;">off_w</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ALIGN_WITH_OFF_W</span><span class="p">(</span><span class="n" style="color: #333;">p</span><span class="p">,</span> <span class="n" style="color: #333;">alignment</span><span class="p">,</span> <span class="n" style="color: #333;">align_off</span><span class="p">);</span></span>
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1177
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<pre style="margin: 0;">+<span id="LC1177" class="line" lang="c"> <span class="n" style="color: #333;">MEMSET_IF_PROFILING_W</span><span class="p">(</span><span class="n" style="color: #333;">p</span><span class="p">,</span> <span class="mi" style="color: #099;">0</span><span class="p">,</span> <span class="n" style="color: #333;">off_w</span><span class="p">);</span></span>
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1178
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<pre style="margin: 0;">+<span id="LC1178" class="line" lang="c"> <span class="n" style="color: #333;">p</span> <span class="o" style="font-weight: 600;">+=</span> <span class="n" style="color: #333;">off_w</span><span class="p">;</span></span>
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1179
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<pre style="margin: 0;">+<span id="LC1179" class="line" lang="c"> <span class="n" style="color: #333;">MEMSET_IF_PROFILING_W</span><span class="p">(</span><span class="n" style="color: #333;">p</span> <span class="o" style="font-weight: 600;">+</span> <span class="n" style="color: #333;">n</span><span class="p">,</span> <span class="mi" style="color: #099;">0</span><span class="p">,</span> <span class="n" style="color: #333;">alignment_w</span> <span class="o" style="font-weight: 600;">-</span> <span class="n" style="color: #333;">off_w</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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1180
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<pre style="margin: 0;">+<span id="LC1180" class="line" lang="c"> <span class="k" style="font-weight: 600;">return</span> <span class="n" style="color: #333;">p</span><span class="p">;</span></span>
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1181
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<pre style="margin: 0;">+<span id="LC1181" class="line" lang="c"> <span class="p">}</span></span>
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1182
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<pre style="margin: 0;">+<span id="LC1182" class="line" lang="c"></span>
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1168
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1183
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<pre style="margin: 0;"> <span id="LC1183" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// If the request is for a large object, then allocate()</span></span>
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1169
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1184
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<pre style="margin: 0;"> <span id="LC1184" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// will give us a pinned object anyway.</span></span>
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1170
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1185
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<pre style="margin: 0;"> <span id="LC1185" class="line" lang="c"> <span class="k" style="font-weight: 600;">if</span> <span class="p">(</span><span class="n" style="color: #333;">n</span> <span class="o" style="font-weight: 600;">>=</span> <span class="n" style="color: #333;">LARGE_OBJECT_THRESHOLD</span><span class="o" style="font-weight: 600;">/</span><span class="k" style="font-weight: 600;">sizeof</span><span class="p">(</span><span class="n" style="color: #333;">W_</span><span class="p">))</span> <span class="p">{</span></span>
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