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<h3>
Ben Gamari pushed to branch wip/free-censuses
at <a href="https://gitlab.haskell.org/ghc/ghc">Glasgow Haskell Compiler / GHC</a>
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Commits:
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<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e90af2f456f0430d11eea19b285986e732034798">e90af2f4</a></strong>
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<span>by Ben Gamari</span>
<i>at 2020-06-24T16:08:56-04:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts/ProfHeap: Free old allocations when reinitialising Censuses
Previously when not LDV profiling we would repeatedly reinitialise
`censuses[0]` with `initEra`. This failed to free the `Arena` and
`HashTable` from the old census, resulting in a memory leak.
Fixes #18348.
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<h4>1 changed file:</h4>
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rts/ProfHeap.c
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<h4>Changes:</h4>
<li id="49d63c99feec397a2d9c3692f6d9f1c7698c81d0">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e90af2f456f0430d11eea19b285986e732034798#49d63c99feec397a2d9c3692f6d9f1c7698c81d0"><strong>rts/ProfHeap.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">@@ -347,6 +347,16 @@ LDV_recordDead( const StgClosure *c, uint32_t size )</td>
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347
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347
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<pre style="margin: 0;"> <span id="LC347" class="line" lang="c"><span class="n" style="color: #333;">STATIC_INLINE</span> <span class="kt" style="color: #458; font-weight: 600;">void</span></span>
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348
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348
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<pre style="margin: 0;"> <span id="LC348" class="line" lang="c"><span class="nf" style="color: #900; font-weight: 600;">initEra</span><span class="p">(</span><span class="n" style="color: #333;">Census</span> <span class="o" style="font-weight: 600;">*</span><span class="n" style="color: #333;">census</span><span class="p">)</span></span>
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349
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349
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<pre style="margin: 0;"> <span id="LC349" class="line" lang="c"><span class="p">{</span></span>
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<pre style="margin: 0;">+<span id="LC350" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// N.B. When not LDV profiling we reinitialise the same Census over</span></span>
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<pre style="margin: 0;">+<span id="LC351" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// and over again. Consequently, we need to ensure that we free the</span></span>
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<pre style="margin: 0;">+<span id="LC352" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// resources from the previous census.</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;">census</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">hash</span><span class="p">)</span> <span class="p">{</span></span>
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<pre style="margin: 0;">+<span id="LC354" class="line" lang="c"> <span class="n" style="color: #333;">freeHashTable</span><span class="p">(</span><span class="n" style="color: #333;">census</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">hash</span><span class="p">,</span> <span class="nb" style="color: #0086b3;">NULL</span><span class="p">);</span></span>
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<pre style="margin: 0;">+<span id="LC355" class="line" lang="c"> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC356" class="line" lang="c"> <span class="k" style="font-weight: 600;">if</span> <span class="p">(</span><span class="n" style="color: #333;">census</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">arena</span><span class="p">)</span> <span class="p">{</span></span>
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<pre style="margin: 0;">+<span id="LC357" class="line" lang="c"> <span class="n" style="color: #333;">arenaFree</span><span class="p">(</span><span class="n" style="color: #333;">census</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">arena</span><span class="p">);</span></span>
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<pre style="margin: 0;">+<span id="LC358" class="line" lang="c"> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC359" class="line" lang="c"></span>
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<pre style="margin: 0;"> <span id="LC360" class="line" lang="c"> <span class="n" style="color: #333;">census</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">hash</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">allocHashTable</span><span class="p">();</span></span>
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<pre style="margin: 0;"> <span id="LC361" class="line" lang="c"> <span class="n" style="color: #333;">census</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">ctrs</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="LC362" class="line" lang="c"> <span class="n" style="color: #333;">census</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">arena</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">newArena</span><span class="p">();</span></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">@@ -511,6 +521,11 @@ initHeapProfiling(void)</td>
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<pre style="margin: 0;"> <span id="LC521" class="line" lang="c"></span>
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<pre style="margin: 0;"> <span id="LC522" class="line" lang="c"> <span class="n" style="color: #333;">censuses</span> <span class="o" style="font-weight: 600;">=</span> <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;">Census</span><span class="p">)</span> <span class="o" style="font-weight: 600;">*</span> <span class="n" style="color: #333;">n_censuses</span><span class="p">,</span> <span class="s" style="color: #d14;">"initHeapProfiling"</span><span class="p">);</span></span>
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<pre style="margin: 0;"> <span id="LC523" class="line" lang="c"></span>
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<pre style="margin: 0;">+<span id="LC524" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// Ensure that arena and hash are NULL since otherwise initEra will attempt to free them.</span></span>
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525
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<pre style="margin: 0;">+<span id="LC525" 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;">unsigned</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;">n_censuses</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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526
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<pre style="margin: 0;">+<span id="LC526" class="line" lang="c"> <span class="n" style="color: #333;">censuses</span><span class="p">[</span><span class="n" style="color: #333;">i</span><span class="p">].</span><span class="n" style="color: #333;">arena</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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527
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<pre style="margin: 0;">+<span id="LC527" class="line" lang="c"> <span class="n" style="color: #333;">censuses</span><span class="p">[</span><span class="n" style="color: #333;">i</span><span class="p">].</span><span class="n" style="color: #333;">hash</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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528
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<pre style="margin: 0;">+<span id="LC528" class="line" lang="c"> <span class="p">}</span></span>
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529
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<pre style="margin: 0;"> <span id="LC529" class="line" lang="c"> <span class="n" style="color: #333;">initEra</span><span class="p">(</span> <span class="o" style="font-weight: 600;">&</span><span class="n" style="color: #333;">censuses</span><span class="p">[</span><span class="n" style="color: #333;">era</span><span class="p">]</span> <span class="p">);</span></span>
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515
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530
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<pre style="margin: 0;"> <span id="LC530" class="line" lang="c"></span>
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516
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<pre style="margin: 0;"> <span id="LC531" class="line" lang="c"> <span class="cm" style="color: #998; font-style: italic;">/* initProfilingLogFile(); */</span></span>
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