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<h3>
Ben Gamari pushed to branch wip/T7275
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/decf9ef5f770d0fa95cf35608cfdea25c0520091">decf9ef5</a></strong>
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<span>by Ben Gamari</span>
<i>at 2020-12-10T12:59:58-05:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: Enforce that mark-region isn't used with -h
As noted in #9666, the mark-region GC is not compatible with heap
profiling. Also add documentation for this flag.
Closes #9666.
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<h4>2 changed files:</h4>
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<a href="#6ae923e173536bf0ddb39552416a7e21767287db">
docs/users_guide/runtime_control.rst
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<li class="file-stats">
<a href="#640fc6f2f536ba83f1694f9a7ef3d43e2d0428d3">
rts/RtsFlags.c
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<h4>Changes:</h4>
<li id="6ae923e173536bf0ddb39552416a7e21767287db">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/decf9ef5f770d0fa95cf35608cfdea25c0520091#6ae923e173536bf0ddb39552416a7e21767287db"><strong>docs/users_guide/runtime_control.rst</strong></a>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="411" 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">@@ -411,6 +411,17 @@ performance.</td>
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411
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<pre style="margin: 0;"> <span id="LC411" class="line" lang="plaintext"> Note that :rts-flag:`--nonmoving-gc` cannot be used with ``-G1``,</span>
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<pre style="margin: 0;"> <span id="LC412" class="line" lang="plaintext"> :rts-flag:`profiling <-hc>` nor :rts-flag:`-c`.</span>
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<pre style="margin: 0;"> <span id="LC413" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC414" class="line" lang="plaintext">.. rts-flag:: -w</span>
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<pre style="margin: 0;">+<span id="LC415" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC416" class="line" lang="plaintext"> :default: off</span>
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<pre style="margin: 0;">+<span id="LC417" class="line" lang="plaintext"> :since: a long time ago</span>
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<pre style="margin: 0;">+<span id="LC418" class="line" lang="plaintext"> :reverse: none</span>
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<pre style="margin: 0;">+<span id="LC420" class="line" lang="plaintext"> Uses a mark-region garbage collection strategy for the oldest-generation heap.</span>
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<pre style="margin: 0;">+<span id="LC421" class="line" lang="plaintext"> Note that this cannot be used in conjunction with heap profiling</span>
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<pre style="margin: 0;">+<span id="LC422" class="line" lang="plaintext"> (:rts-flag:`-hT`) unless linked against the profiling runtime system with</span>
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<pre style="margin: 0;">+<span id="LC423" class="line" lang="plaintext"> :ghc-flag:`-prof`.</span>
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<pre style="margin: 0;">+<span id="LC424" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC425" class="line" lang="plaintext">.. rts-flag:: -xn</span>
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<pre style="margin: 0;"> <span id="LC426" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC427" class="line" lang="plaintext"> :default: off</span>
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<li id="640fc6f2f536ba83f1694f9a7ef3d43e2d0428d3">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/decf9ef5f770d0fa95cf35608cfdea25c0520091#640fc6f2f536ba83f1694f9a7ef3d43e2d0428d3"><strong>rts/RtsFlags.c</strong></a>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1849" 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="1849" 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">@@ -1849,6 +1849,16 @@ static void normaliseRtsOpts (void)</td>
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<pre style="margin: 0;"> <span id="LC1849" class="line" lang="c"> <span class="n" style="color: #333;">barf</span><span class="p">(</span><span class="s" style="color: #d14;">"The non-moving collector doesn't support -G1"</span><span class="p">);</span></span>
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<pre style="margin: 0;"> <span id="LC1850" class="line" lang="c"> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC1851" class="line" lang="c"></span>
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<pre style="margin: 0;">+<span id="LC1852" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#if !defined(PROFILING) && !defined(DEBUG)</span></span>
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1853
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<pre style="margin: 0;">+<span id="LC1853" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// The mark-region collector is incompatible with heap census unless</span></span>
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1854
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<pre style="margin: 0;">+<span id="LC1854" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// we zero slop of blackhole'd thunks, which doesn't happen in the</span></span>
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1855
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<pre style="margin: 0;">+<span id="LC1855" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// vanilla way. See #9666.</span></span>
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1856
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<pre style="margin: 0;">+<span id="LC1856" class="line" lang="c"> <span class="k" style="font-weight: 600;">if</span> <span class="p">(</span><span class="n" style="color: #333;">RtsFlags</span><span class="p">.</span><span class="n" style="color: #333;">ProfFlags</span><span class="p">.</span><span class="n" style="color: #333;">doHeapProfile</span> <span class="o" style="font-weight: 600;">&&</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;">sweep</span><span class="p">)</span> <span class="p">{</span></span>
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1857
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<pre style="margin: 0;">+<span id="LC1857" class="line" lang="c"> <span class="n" style="color: #333;">barf</span><span class="p">(</span><span class="s" style="color: #d14;">"The mark-region collector can only be used with profiling</span><span class="se" style="color: #d14;">\n</span><span class="s" style="color: #d14;">"</span></span>
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1858
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<pre style="margin: 0;">+<span id="LC1858" class="line" lang="c"> <span class="s" style="color: #d14;">"when linked against the profiled RTS."</span><span class="p">);</span></span>
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1859
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<pre style="margin: 0;">+<span id="LC1859" class="line" lang="c"> <span class="p">}</span></span>
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1860
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<pre style="margin: 0;">+<span id="LC1860" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#endif</span></span>
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1861
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<pre style="margin: 0;">+<span id="LC1861" class="line" lang="c"></span>
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1852
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1862
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<pre style="margin: 0;"> <span id="LC1862" class="line" lang="c"> <span class="k" style="font-weight: 600;">if</span> <span class="p">(</span><span class="n" style="color: #333;">RtsFlags</span><span class="p">.</span><span class="n" style="color: #333;">ProfFlags</span><span class="p">.</span><span class="n" style="color: #333;">doHeapProfile</span> <span class="o" style="font-weight: 600;">!=</span> <span class="n" style="color: #333;">NO_HEAP_PROFILING</span> <span class="o" style="font-weight: 600;">&&</span></span>
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1853
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1863
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<pre style="margin: 0;"> <span id="LC1863" class="line" lang="c"> <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;">useNonmoving</span><span class="p">)</span> <span class="p">{</span></span>
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1854
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1864
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<pre style="margin: 0;"> <span id="LC1864" class="line" lang="c"> <span class="n" style="color: #333;">barf</span><span class="p">(</span><span class="s" style="color: #d14;">"The non-moving collector doesn't support profiling"</span><span class="p">);</span></span>
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