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<h3>
Ben Gamari pushed to branch wip/nonmoving-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/cc9c6b5b9f8eb7ce0527e008d22f625136646dab">cc9c6b5b</a></strong>
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<span>by Ben Gamari</span>
<i>at 2020-12-09T23:29:00-05:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">nonmoving: Fix small CPP bug
Previously an incorrect semicolon meant that we would fail to call
busy_wait_nop when spinning.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/62265eb38a56eebc24401b43895a9fe65f545d0f">62265eb3</a></strong>
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<span>by Ben Gamari</span>
<i>at 2020-12-09T23:29:00-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">nonmoving: Don't push objects during deadlock detect GC
Previously we would push large objects and compact regions to the mark
queue during the deadlock detect GC, resulting in failure to detect
deadlocks.
</pre>
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<h4>2 changed files:</h4>
<ul>
<li class="file-stats">
<a href="#37a93df244a7789fddf557443b6398d06763e9cc">
rts/sm/Evac.c
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<li class="file-stats">
<a href="#4f5ba3ce18ccc17ad367193f379aa61f4c9180a0">
rts/sm/NonMovingMark.c
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<h4>Changes:</h4>
<li id="37a93df244a7789fddf557443b6398d06763e9cc">
<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/82b6b3a6d41cc02ba6232e53ee7e9cd00f5a2a82...62265eb38a56eebc24401b43895a9fe65f545d0f#37a93df244a7789fddf557443b6398d06763e9cc"><strong>rts/sm/Evac.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">@@ -406,7 +406,9 @@ evacuate_large(StgPtr p)</td>
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<pre style="margin: 0;"> <span id="LC406" class="line" lang="c"> <span class="n" style="color: #333;">__atomic_fetch_or</span><span class="p">(</span><span class="o" style="font-weight: 600;">&</span><span class="n" style="color: #333;">bd</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">flags</span><span class="p">,</span> <span class="n" style="color: #333;">BF_NONMOVING</span><span class="p">,</span> <span class="n" style="color: #333;">__ATOMIC_ACQ_REL</span><span class="p">);</span></span>
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407
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<pre style="margin: 0;"> <span id="LC407" class="line" lang="c"></span>
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<pre style="margin: 0;"> <span id="LC408" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// See Note [Non-moving GC: Marking evacuated objects].</span></span>
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<pre style="margin: 0;">-<span id="LC409" class="line" lang="c"> <span class="n" style="color: #333;">markQueuePushClosureGC</span><span class="p">(</span><span class="o" style="font-weight: 600;">&</span><span class="n" style="color: #333;">gct</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">cap</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">upd_rem_set</span><span class="p">.</span><span class="n" style="color: #333;">queue</span><span class="p">,</span> <span class="p">(</span><span class="n" style="color: #333;">StgClosure</span> <span class="o" style="font-weight: 600;">*</span><span class="p">)</span> <span class="n" style="color: #333;">p</span><span class="p">);</span></span>
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<pre style="margin: 0;">+<span id="LC409" class="line" lang="c"> <span class="k" style="font-weight: 600;">if</span> <span class="p">(</span><span class="n" style="color: #333;">major_gc</span> <span class="o" style="font-weight: 600;">&&</span> <span class="o" style="font-weight: 600;">!</span><span class="n" style="color: #333;">deadlock_detect_gc</span><span class="p">)</span> <span class="p">{</span></span>
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<pre style="margin: 0;">+<span id="LC410" class="line" lang="c"> <span class="n" style="color: #333;">markQueuePushClosureGC</span><span class="p">(</span><span class="o" style="font-weight: 600;">&</span><span class="n" style="color: #333;">gct</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">cap</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">upd_rem_set</span><span class="p">.</span><span class="n" style="color: #333;">queue</span><span class="p">,</span> <span class="p">(</span><span class="n" style="color: #333;">StgClosure</span> <span class="o" style="font-weight: 600;">*</span><span class="p">)</span> <span class="n" style="color: #333;">p</span><span class="p">);</span></span>
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<pre style="margin: 0;">+<span id="LC411" class="line" lang="c"> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC412" class="line" lang="c"> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC413" class="line" lang="c"> <span class="n" style="color: #333;">initBdescr</span><span class="p">(</span><span class="n" style="color: #333;">bd</span><span class="p">,</span> <span class="n" style="color: #333;">new_gen</span><span class="p">,</span> <span class="n" style="color: #333;">new_gen</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">to</span><span class="p">);</span></span>
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<pre style="margin: 0;"> <span id="LC414" 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">@@ -563,7 +565,9 @@ evacuate_compact (StgPtr p)</td>
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<pre style="margin: 0;"> <span id="LC565" class="line" lang="c"> <span class="n" style="color: #333;">__atomic_fetch_or</span><span class="p">(</span><span class="o" style="font-weight: 600;">&</span><span class="n" style="color: #333;">bd</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">flags</span><span class="p">,</span> <span class="n" style="color: #333;">BF_NONMOVING</span><span class="p">,</span> <span class="n" style="color: #333;">__ATOMIC_RELAXED</span><span class="p">);</span></span>
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<pre style="margin: 0;"> <span id="LC566" class="line" lang="c"></span>
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<pre style="margin: 0;"> <span id="LC567" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// See Note [Non-moving GC: Marking evacuated objects].</span></span>
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<pre style="margin: 0;">-<span id="LC566" class="line" lang="c"> <span class="n" style="color: #333;">markQueuePushClosureGC</span><span class="p">(</span><span class="o" style="font-weight: 600;">&</span><span class="n" style="color: #333;">gct</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">cap</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">upd_rem_set</span><span class="p">.</span><span class="n" style="color: #333;">queue</span><span class="p">,</span> <span class="p">(</span><span class="n" style="color: #333;">StgClosure</span> <span class="o" style="font-weight: 600;">*</span><span class="p">)</span> <span class="n" style="color: #333;">str</span><span class="p">);</span></span>
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<pre style="margin: 0;">+<span id="LC568" class="line" lang="c"> <span class="k" style="font-weight: 600;">if</span> <span class="p">(</span><span class="n" style="color: #333;">major_gc</span> <span class="o" style="font-weight: 600;">&&</span> <span class="o" style="font-weight: 600;">!</span><span class="n" style="color: #333;">deadlock_detect_gc</span><span class="p">)</span> <span class="p">{</span></span>
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<pre style="margin: 0;">+<span id="LC569" class="line" lang="c"> <span class="n" style="color: #333;">markQueuePushClosureGC</span><span class="p">(</span><span class="o" style="font-weight: 600;">&</span><span class="n" style="color: #333;">gct</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">cap</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">upd_rem_set</span><span class="p">.</span><span class="n" style="color: #333;">queue</span><span class="p">,</span> <span class="p">(</span><span class="n" style="color: #333;">StgClosure</span> <span class="o" style="font-weight: 600;">*</span><span class="p">)</span> <span class="n" style="color: #333;">str</span><span class="p">);</span></span>
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<pre style="margin: 0;">+<span id="LC570" class="line" lang="c"> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC571" class="line" lang="c"> <span class="p">}</span></span>
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572
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<pre style="margin: 0;"> <span id="LC572" class="line" lang="c"> <span class="n" style="color: #333;">initBdescr</span><span class="p">(</span><span class="n" style="color: #333;">bd</span><span class="p">,</span> <span class="n" style="color: #333;">new_gen</span><span class="p">,</span> <span class="n" style="color: #333;">new_gen</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">to</span><span class="p">);</span></span>
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573
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<pre style="margin: 0;"> <span id="LC573" class="line" lang="c"></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/82b6b3a6d41cc02ba6232e53ee7e9cd00f5a2a82...62265eb38a56eebc24401b43895a9fe65f545d0f#4f5ba3ce18ccc17ad367193f379aa61f4c9180a0"><strong>rts/sm/NonMovingMark.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">@@ -737,9 +737,11 @@ void updateRemembSetPushStack(Capability *cap, StgStack *stack)</td>
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<pre style="margin: 0;"> <span id="LC737" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// The concurrent GC has claimed the right to mark the stack.</span></span>
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738
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<pre style="margin: 0;"> <span id="LC738" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// Wait until it finishes marking before proceeding with</span></span>
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739
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739
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<pre style="margin: 0;"> <span id="LC739" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// mutation.</span></span>
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740
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<pre style="margin: 0;">-<span id="LC740" class="line" lang="c"> <span class="k" style="font-weight: 600;">while</span> <span class="p">(</span><span class="n" style="color: #333;">needs_upd_rem_set_mark</span><span class="p">((</span><span class="n" style="color: #333;">StgClosure</span> <span class="o" style="font-weight: 600;">*</span><span class="p">)</span> <span class="n" style="color: #333;">stack</span><span class="p">))<span class="idiff left right">;</span></span></span>
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740
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<pre style="margin: 0;">+<span id="LC740" class="line" lang="c"> <span class="k" style="font-weight: 600;">while</span> <span class="p">(</span><span class="n" style="color: #333;">needs_upd_rem_set_mark</span><span class="p">((</span><span class="n" style="color: #333;">StgClosure</span> <span class="o" style="font-weight: 600;">*</span><span class="p">)</span> <span class="n" style="color: #333;">stack</span><span class="p">))</span></span>
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741
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741
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<pre style="margin: 0;"> <span id="LC741" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#if defined(PARALLEL_GC)</span></span>
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742
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<pre style="margin: 0;"> <span id="LC742" class="line" lang="c"> <span class="n" style="color: #333;">busy_wait_nop</span><span class="p">();</span> <span class="c1" style="color: #998; font-style: italic;">// TODO: Spinning here is unfortunate</span></span>
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<pre style="margin: 0;">+<span id="LC743" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#else</span></span>
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<pre style="margin: 0;">+<span id="LC744" class="line" lang="c"> <span class="p">;</span></span>
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743
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745
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<pre style="margin: 0;"> <span id="LC745" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#endif</span></span>
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744
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746
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<pre style="margin: 0;"> <span id="LC746" class="line" lang="c"> <span class="k" style="font-weight: 600;">return</span><span class="p">;</span></span>
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<pre style="margin: 0;"> <span id="LC747" class="line" lang="c"> <span class="p">}</span></span>
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