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<h3>
Marge Bot pushed to branch master
at <a href="https://gitlab.haskell.org/ghc/ghc">Glasgow Haskell Compiler / GHC</a>
</h3>
<h4>
Commits:
</h4>
<ul>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/2aa676114bca40d6124ba90d13242c7c102369e0">2aa67611</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-04-30T21:34:44-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">nonmoving: Clear bitmap after initializing block size
Previously nonmovingInitSegment would clear the bitmap before
initializing the segment's block size. This is broken since
nonmovingClearBitmap looks at the segment's block size to determine how
much bitmap to clear.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/54dad3cf1e04f16ea00fb6a41b378e948c8ebf0f">54dad3cf</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-04-30T21:34:44-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">nonmoving: Explicitly memoize block count
A profile cast doubt on whether the compiler hoisted the bound out the
loop as I would have expected here. It turns out it did but nevertheless
it seems clearer to just do this manually.
</pre>
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<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/99ff8145044288a8a58c8028516903937ba3935c">99ff8145</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-04-30T21:34:44-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">nonmoving: Eagerly flush all capabilities' update remembered sets
(cherry picked from commit 2fa79119570b358a4db61446396889b8260d7957)
</pre>
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<h4>3 changed files:</h4>
<ul>
<li class="file-stats">
<a href="#6477e10756faf038741e63d1ad499a1df809fe10">
rts/sm/GC.c
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<li class="file-stats">
<a href="#b4a38dad10ba126e05a0b6adc99aa0c2eb742875">
rts/sm/NonMoving.c
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<li class="file-stats">
<a href="#78077cd665e91d3877a41e287033df6d2884b2ce">
rts/sm/NonMovingSweep.c
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<h4>Changes:</h4>
<li id="6477e10756faf038741e63d1ad499a1df809fe10">
<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/014ef4a3d9ee30b8add9118950f1f5007143bd1c...99ff8145044288a8a58c8028516903937ba3935c#6477e10756faf038741e63d1ad499a1df809fe10"><strong>rts/sm/GC.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">@@ -738,11 +738,13 @@ GarbageCollect (uint32_t collect_gen,</td>
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<pre style="margin: 0;"> <span id="LC738" class="line" lang="c"> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC739" class="line" lang="c"> <span class="p">}</span> <span class="c1" style="color: #998; font-style: italic;">// for all generations</span></span>
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<pre style="margin: 0;"> <span id="LC740" class="line" lang="c"></span>
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<pre style="margin: 0;">-<span id="LC741" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// Flush the update remembered set. See Note [Eager update remembered set</span></span>
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<pre style="margin: 0;">+<span id="LC741" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// Flush the update remembered set<span class="idiff left right">s</span>. See Note [Eager update remembered set</span></span>
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<pre style="margin: 0;"> <span id="LC742" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// flushing] in NonMovingMark.c</span></span>
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<pre style="margin: 0;"> <span id="LC743" 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;">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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<pre style="margin: 0;"> <span id="LC744" class="line" lang="c"> <span class="n" style="color: #333;">RELEASE_SM_LOCK</span><span class="p">;</span></span>
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<pre style="margin: 0;">-<span id="LC745" class="line" lang="c"> <span class="n" style="color: #333;">nonmovingAddUpdRemSetBlocks</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>
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<pre style="margin: 0;">+<span id="LC745" class="line" lang="c"> <span class="k" style="font-weight: 600;">for</span> <span class="p">(</span><span class="n" style="color: #333;">n</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;">n</span> <span class="o" style="font-weight: 600;"><</span> <span class="n" style="color: #333;">n_capabilities</span><span class="p">;</span> <span class="n" style="color: #333;">n</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="LC746" class="line" lang="c"> <span class="n" style="color: #333;">nonmovingAddUpdRemSetBlocks</span><span class="p">(</span><span class="o" style="font-weight: 600;">&</span><span class="n" style="color: #333;">capabilities</span><span class="p">[</span><span class="n" style="color: #333;">n</span><span class="p">]</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>
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<pre style="margin: 0;">+<span id="LC747" class="line" lang="c"> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC748" class="line" lang="c"> <span class="n" style="color: #333;">ACQUIRE_SM_LOCK</span><span class="p">;</span></span>
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<pre style="margin: 0;"> <span id="LC749" class="line" lang="c"> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC750" class="line" lang="c"></span>
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<li id="b4a38dad10ba126e05a0b6adc99aa0c2eb742875">
<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/014ef4a3d9ee30b8add9118950f1f5007143bd1c...99ff8145044288a8a58c8028516903937ba3935c#b4a38dad10ba126e05a0b6adc99aa0c2eb742875"><strong>rts/sm/NonMoving.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">@@ -402,10 +402,10 @@ static void nonmovingInitSegment(struct NonmovingSegment *seg, uint8_t log_block</td>
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<pre style="margin: 0;"> <span id="LC402" class="line" lang="c"> <span class="n" style="color: #333;">seg</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">link</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="LC403" class="line" lang="c"> <span class="n" style="color: #333;">seg</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">todo_link</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="LC404" class="line" lang="c"> <span class="n" style="color: #333;">seg</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">next_free</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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<pre style="margin: 0;">-<span id="LC405" class="line" lang="c"> <span class="n" style="color: #333;">nonmovingClearBitmap</span><span class="p">(</span><span class="n" style="color: #333;">seg</span><span class="p">);</span></span>
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<pre style="margin: 0;"> <span id="LC405" class="line" lang="c"> <span class="n" style="color: #333;">bd</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">nonmoving_segment</span><span class="p">.</span><span class="n" style="color: #333;">log_block_size</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">log_block_size</span><span class="p">;</span></span>
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<pre style="margin: 0;"> <span id="LC406" class="line" lang="c"> <span class="n" style="color: #333;">bd</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">nonmoving_segment</span><span class="p">.</span><span class="n" style="color: #333;">next_free_snap</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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<pre style="margin: 0;"> <span id="LC407" class="line" lang="c"> <span class="n" style="color: #333;">bd</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">u</span><span class="p">.</span><span class="n" style="color: #333;">scan</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">nonmovingSegmentGetBlock</span><span class="p">(</span><span class="n" style="color: #333;">seg</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="LC408" class="line" lang="c"> <span class="n" style="color: #333;">nonmovingClearBitmap</span><span class="p">(</span><span class="n" style="color: #333;">seg</span><span class="p">);</span></span>
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<pre style="margin: 0;"> <span id="LC409" class="line" lang="c"><span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC410" class="line" lang="c"></span>
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<pre style="margin: 0;"> <span id="LC411" class="line" lang="c"><span class="c1" style="color: #998; font-style: italic;">// Add a segment to the free list.</span></span>
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<li id="78077cd665e91d3877a41e287033df6d2884b2ce">
<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/014ef4a3d9ee30b8add9118950f1f5007143bd1c...99ff8145044288a8a58c8028516903937ba3935c#78077cd665e91d3877a41e287033df6d2884b2ce"><strong>rts/sm/NonMovingSweep.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">@@ -31,12 +31,11 @@ enum SweepResult {</td>
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<pre style="margin: 0;"> <span id="LC31" class="line" lang="c"><span class="n" style="color: #333;">GNUC_ATTR_HOT</span> <span class="k" style="font-weight: 600;">static</span> <span class="k" style="font-weight: 600;">enum</span> <span class="n" style="color: #333;">SweepResult</span></span>
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<pre style="margin: 0;"> <span id="LC32" class="line" lang="c"><span class="nf" style="color: #900; font-weight: 600;">nonmovingSweepSegment</span><span class="p">(</span><span class="k" style="font-weight: 600;">struct</span> <span class="n" style="color: #333;">NonmovingSegment</span> <span class="o" style="font-weight: 600;">*</span><span class="n" style="color: #333;">seg</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC33" class="line" lang="c"><span class="p">{</span></span>
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<pre style="margin: 0;">+<span id="LC34" class="line" lang="c"> <span class="k" style="font-weight: 600;">const</span> <span class="n" style="color: #333;">nonmoving_block_idx</span> <span class="n" style="color: #333;">blk_cnt</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">nonmovingSegmentBlockCount</span><span class="p">(</span><span class="n" style="color: #333;">seg</span><span class="p">);</span></span>
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<pre style="margin: 0;"> <span id="LC35" class="line" lang="c"> <span class="n" style="color: #333;">bool</span> <span class="n" style="color: #333;">found_free</span> <span class="o" style="font-weight: 600;">=</span> <span class="nb" style="color: #0086b3;">false</span><span class="p">;</span></span>
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<pre style="margin: 0;"> <span id="LC36" class="line" lang="c"> <span class="n" style="color: #333;">bool</span> <span class="n" style="color: #333;">found_live</span> <span class="o" style="font-weight: 600;">=</span> <span class="nb" style="color: #0086b3;">false</span><span class="p">;</span></span>
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<pre style="margin: 0;"> <span id="LC37" class="line" lang="c"></span>
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<pre style="margin: 0;">-<span id="LC37" class="line" lang="c"> <span class="k" style="font-weight: 600;">for</span> <span class="p">(</span><span class="n" style="color: #333;">nonmoving_block_idx</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>
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<pre style="margin: 0;">-<span id="LC38" class="line" lang="c"> <span class="n" style="color: #333;">i</span> <span class="o" style="font-weight: 600;"><</span> <span class="n" style="color: #333;">nonmovingSegmentBlockCount</span><span class="p">(</span><span class="n" style="color: #333;">seg</span><span class="p">);</span></span>
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<pre style="margin: 0;">-<span id="LC39" class="line" lang="c"> <span class="o" style="font-weight: 600;">++</span><span class="n" style="color: #333;">i</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC38" class="line" lang="c"> <span class="k" style="font-weight: 600;">for</span> <span class="p">(</span><span class="n" style="color: #333;">nonmoving_block_idx</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;">blk_cnt</span><span class="p">;</span> <span class="o" style="font-weight: 600;">++</span><span class="n" style="color: #333;">i</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC39" class="line" lang="c"> <span class="p">{</span></span>
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<pre style="margin: 0;"> <span id="LC40" class="line" lang="c"> <span class="k" style="font-weight: 600;">if</span> <span class="p">(</span><span class="n" style="color: #333;">seg</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">bitmap</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;">nonmovingMarkEpoch</span><span class="p">)</span> <span class="p">{</span></span>
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<pre style="margin: 0;"> <span id="LC41" class="line" lang="c"> <span class="n" style="color: #333;">found_live</span> <span class="o" style="font-weight: 600;">=</span> <span class="nb" style="color: #0086b3;">true</span><span class="p">;</span></span>
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