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<h3>
Ben Gamari pushed to branch wip/tsan/storage
at <a href="https://gitlab.haskell.org/ghc/ghc">Glasgow Haskell Compiler / GHC</a>
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<h4>
Commits:
</h4>
<ul>
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<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/105d43db7bb7f399be3e5474d207e330d1b2da5a">105d43db</a></strong>
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<span>by Ben Gamari</span>
<i>at 2020-10-30T14:02:19-04:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts/SpinLock: Separate out slow path
Not only is this in general a good idea, but it turns out that GCC
unrolls the retry loop, resulting is massive code bloat in critical
parts of the RTS (e.g. `evacuate`).
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f7b45cde43f47f94b77411477aabdb56f8f63d66">f7b45cde</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-10-30T14:02:19-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: Use relaxed ordering on spinlock counters
</pre>
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<h4>4 changed files:</h4>
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<a href="#397950c6118f4b5a74a10249b6bcc322ab8e2e25">
includes/rts/SpinLock.h
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<a href="#fbe566a2918ba0562be9aceeb5d07448bf2f9ed0">
includes/stg/SMP.h
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<a href="#6b4f3c89a36017ba0c8ca6c6bd086631c47406df">
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+
rts/SpinLock.c
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<a href="#e432c7b248b68100c3cc37db36ee80d975efd697">
rts/rts.cabal.in
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<h4>Changes:</h4>
<li id="397950c6118f4b5a74a10249b6bcc322ab8e2e25">
<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/f538641f2319370c88fd3dee3770d5f8ac970ccc...f7b45cde43f47f94b77411477aabdb56f8f63d66#397950c6118f4b5a74a10249b6bcc322ab8e2e25"><strong>includes/rts/SpinLock.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">@@ -39,19 +39,14 @@ typedef struct SpinLock_</td>
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<pre style="margin: 0;"> <span id="LC39" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#define IF_PROF_SPIN(x)</span></span>
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<pre style="margin: 0;"> <span id="LC40" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#endif</span></span>
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<pre style="margin: 0;"> <span id="LC41" class="line" lang="c"></span>
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<pre style="margin: 0;">+<span id="LC42" class="line" lang="c"><span class="kt" style="color: #458; font-weight: 600;">void</span> <span class="nf" style="color: #900; font-weight: 600;">acquire_spin_lock_slow_path</span><span class="p">(</span><span class="n" style="color: #333;">SpinLock</span> <span class="o" style="font-weight: 600;">*</span> <span class="n" style="color: #333;">p</span><span class="p">);</span></span>
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<pre style="margin: 0;">+<span id="LC43" class="line" lang="c"></span>
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<pre style="margin: 0;"> <span id="LC44" class="line" lang="c"><span class="c1" style="color: #998; font-style: italic;">// acquire spin lock</span></span>
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<pre style="margin: 0;"> <span id="LC45" class="line" lang="c"><span class="n" style="color: #333;">INLINE_HEADER</span> <span class="kt" style="color: #458; font-weight: 600;">void</span> <span class="nf" style="color: #900; font-weight: 600;">ACQUIRE_SPIN_LOCK</span><span class="p">(</span><span class="n" style="color: #333;">SpinLock</span> <span class="o" style="font-weight: 600;">*</span> <span class="n" style="color: #333;">p</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC46" class="line" lang="c"><span class="p">{</span></span>
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<pre style="margin: 0;">-<span id="LC45" class="line" lang="c"> <span class="k" style="font-weight: 600;">do</span> <span class="p">{</span></span>
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<pre style="margin: 0;">-<span id="LC46" 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;">uint32_t</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;">SPIN_COUNT</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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<pre style="margin: 0;">-<span id="LC47" class="line" lang="c"> <span class="n" style="color: #333;">StgWord32</span> <span class="n" style="color: #333;">r</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">cas</span><span class="p">((</span><span class="n" style="color: #333;">StgVolatilePtr</span><span class="p">)</span><span class="o" style="font-weight: 600;">&</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;">lock</span><span class="p">),</span> <span class="mi" style="color: #099;">1</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="LC48" class="line" lang="c"> <span class="k" style="font-weight: 600;">if</span> <span class="p">(</span><span class="n" style="color: #333;">r</span> <span class="o" style="font-weight: 600;">!=</span> <span class="mi" style="color: #099;">0</span><span class="p">)</span> <span class="k" style="font-weight: 600;">return</span><span class="p">;</span></span>
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<pre style="margin: 0;">-<span id="LC49" class="line" lang="c"> <span class="n" style="color: #333;">IF_PROF_SPIN</span><span class="p">(</span><span class="n" style="color: #333;">__atomic_fetch_add</span><span class="p">(</span><span class="o" style="font-weight: 600;">&</span><span class="n" style="color: #333;">p</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">spin</span><span class="p">,</span> <span class="mi" style="color: #099;">1</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="LC50" class="line" lang="c"> <span class="n" style="color: #333;">busy_wait_nop</span><span class="p">();</span></span>
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<pre style="margin: 0;">-<span id="LC51" class="line" lang="c"> <span class="p">}</span></span>
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<pre style="margin: 0;">-<span id="LC52" class="line" lang="c"> <span class="n" style="color: #333;">IF_PROF_SPIN</span><span class="p">(</span><span class="n" style="color: #333;">__atomic_fetch_add</span><span class="p">(</span><span class="o" style="font-weight: 600;">&</span><span class="n" style="color: #333;">p</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">yield</span><span class="p">,</span> <span class="mi" style="color: #099;">1</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="LC53" class="line" lang="c"> <span class="n" style="color: #333;">yieldThread</span><span class="p">();</span></span>
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<pre style="margin: 0;">-<span id="LC54" class="line" lang="c"> <span class="p">}</span> <span class="k" style="font-weight: 600;">while</span> <span class="p">(</span><span class="mi" style="color: #099;">1</span><span class="p">);</span></span>
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<pre style="margin: 0;">+<span id="LC47" class="line" lang="c"> <span class="n" style="color: #333;">StgWord32</span> <span class="n" style="color: #333;">r</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">cas</span><span class="p">((</span><span class="n" style="color: #333;">StgVolatilePtr</span><span class="p">)</span><span class="o" style="font-weight: 600;">&</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;">lock</span><span class="p">),</span> <span class="mi" style="color: #099;">1</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="LC48" 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;">r</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="LC49" class="line" lang="c"> <span class="n" style="color: #333;">acquire_spin_lock_slow_path</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="LC50" class="line" lang="c"><span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC51" class="line" lang="c"></span>
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<pre style="margin: 0;"> <span id="LC52" class="line" lang="c"><span class="c1" style="color: #998; font-style: italic;">// release spin lock</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/f538641f2319370c88fd3dee3770d5f8ac970ccc...f7b45cde43f47f94b77411477aabdb56f8f63d66#fbe566a2918ba0562be9aceeb5d07448bf2f9ed0"><strong>includes/stg/SMP.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">@@ -440,6 +440,7 @@ load_load_barrier(void) {</td>
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<pre style="margin: 0;"> <span id="LC440" class="line" lang="c"><span class="c1" style="color: #998; font-style: italic;">// Relaxed atomic operations.</span></span>
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<pre style="margin: 0;"> <span id="LC441" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#define RELAXED_LOAD(ptr) __atomic_load_n(ptr, __ATOMIC_RELAXED)</span></span>
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<pre style="margin: 0;"> <span id="LC442" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#define RELAXED_STORE(ptr,val) __atomic_store_n(ptr, val, __ATOMIC_RELAXED)</span></span>
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<pre style="margin: 0;">+<span id="LC443" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#define RELAXED_ADD(ptr,val) __atomic_add_fetch(ptr, val, __ATOMIC_RELAXED)</span></span>
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<pre style="margin: 0;"> <span id="LC444" class="line" lang="c"></span>
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<pre style="margin: 0;"> <span id="LC445" class="line" lang="c"><span class="c1" style="color: #998; font-style: italic;">// Acquire/release atomic operations</span></span>
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<pre style="margin: 0;"> <span id="LC446" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#define ACQUIRE_LOAD(ptr) __atomic_load_n(ptr, __ATOMIC_ACQUIRE)</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">@@ -466,6 +467,7 @@ EXTERN_INLINE void load_load_barrier () {} /* nothing */</td>
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<pre style="margin: 0;"> <span id="LC467" class="line" lang="c"><span class="c1" style="color: #998; font-style: italic;">// Relaxed atomic operations</span></span>
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<pre style="margin: 0;"> <span id="LC468" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#define RELAXED_LOAD(ptr) *ptr</span></span>
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<pre style="margin: 0;"> <span id="LC469" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#define RELAXED_STORE(ptr,val) *ptr = val</span></span>
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<pre style="margin: 0;">+<span id="LC470" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#define RELAXED_ADD(ptr,val) *ptr += val</span></span>
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<pre style="margin: 0;"> <span id="LC471" class="line" lang="c"></span>
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<pre style="margin: 0;"> <span id="LC472" class="line" lang="c"><span class="c1" style="color: #998; font-style: italic;">// Acquire/release atomic operations</span></span>
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<pre style="margin: 0;"> <span id="LC473" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#define ACQUIRE_LOAD(ptr) *ptr</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/f538641f2319370c88fd3dee3770d5f8ac970ccc...f7b45cde43f47f94b77411477aabdb56f8f63d66#6b4f3c89a36017ba0c8ca6c6bd086631c47406df"><strong>rts/SpinLock.c</strong></a>
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<pre style="margin: 0;">+<span id="LC1" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;">/* ----------------------------------------------------------------------------</span></span>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> *</span></span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * (c) The GHC Team, 2006-2009</span></span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> *</span></span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * Spin locks</span></span>
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6
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> *</span></span>
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * These are simple spin-only locks as opposed to Mutexes which</span></span>
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<pre style="margin: 0;">+<span id="LC8" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * probably spin for a while before blocking in the kernel. We use</span></span>
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<pre style="margin: 0;">+<span id="LC9" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * these when we are sure that all our threads are actively running on</span></span>
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<pre style="margin: 0;">+<span id="LC10" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * a CPU, eg. in the GC.</span></span>
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<pre style="margin: 0;">+<span id="LC11" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> *</span></span>
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<pre style="margin: 0;">+<span id="LC12" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * TODO: measure whether we really need these, or whether Mutexes</span></span>
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<pre style="margin: 0;">+<span id="LC13" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * would do (and be a bit safer if a CPU becomes loaded).</span></span>
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<pre style="margin: 0;">+<span id="LC14" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> *</span></span>
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<pre style="margin: 0;">+<span id="LC15" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * Do not #include this file directly: #include "Rts.h" instead.</span></span>
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<pre style="margin: 0;">+<span id="LC16" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> *</span></span>
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<pre style="margin: 0;">+<span id="LC17" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * To understand the structure of the RTS headers, see the wiki:</span></span>
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<pre style="margin: 0;">+<span id="LC18" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * https://gitlab.haskell.org/ghc/ghc/wikis/commentary/source-tree/includes</span></span>
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<pre style="margin: 0;">+<span id="LC19" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> *</span></span>
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<pre style="margin: 0;">+<span id="LC20" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * -------------------------------------------------------------------------- */</span></span>
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<pre style="margin: 0;">+<span id="LC21" class="line" lang="c"></span>
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<pre style="margin: 0;">+<span id="LC22" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#include "PosixSource.h"</span></span>
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<pre style="margin: 0;">+<span id="LC23" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#include "Rts.h"</span></span>
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<pre style="margin: 0;">+<span id="LC24" class="line" lang="c"></span>
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<pre style="margin: 0;">+<span id="LC25" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#if defined(THREADED_RTS)</span></span>
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<pre style="margin: 0;">+<span id="LC26" class="line" lang="c"></span>
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<pre style="margin: 0;">+<span id="LC27" class="line" lang="c"><span class="kt" style="color: #458; font-weight: 600;">void</span> <span class="nf" style="color: #900; font-weight: 600;">acquire_spin_lock_slow_path</span><span class="p">(</span><span class="n" style="color: #333;">SpinLock</span> <span class="o" style="font-weight: 600;">*</span> <span class="n" style="color: #333;">p</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC28" class="line" lang="c"><span class="p">{</span></span>
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<pre style="margin: 0;">+<span id="LC29" class="line" lang="c"> <span class="k" style="font-weight: 600;">do</span> <span class="p">{</span></span>
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<pre style="margin: 0;">+<span id="LC30" 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;">uint32_t</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;">SPIN_COUNT</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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<pre style="margin: 0;">+<span id="LC31" class="line" lang="c"> <span class="n" style="color: #333;">StgWord32</span> <span class="n" style="color: #333;">r</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">cas</span><span class="p">((</span><span class="n" style="color: #333;">StgVolatilePtr</span><span class="p">)</span><span class="o" style="font-weight: 600;">&</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;">lock</span><span class="p">),</span> <span class="mi" style="color: #099;">1</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="LC32" class="line" lang="c"> <span class="k" style="font-weight: 600;">if</span> <span class="p">(</span><span class="n" style="color: #333;">r</span> <span class="o" style="font-weight: 600;">!=</span> <span class="mi" style="color: #099;">0</span><span class="p">)</span> <span class="k" style="font-weight: 600;">return</span><span class="p">;</span></span>
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<pre style="margin: 0;">+<span id="LC33" class="line" lang="c"> <span class="n" style="color: #333;">IF_PROF_SPIN</span><span class="p">(</span><span class="n" style="color: #333;">RELAXED_ADD</span><span class="p">(</span><span class="o" style="font-weight: 600;">&</span><span class="n" style="color: #333;">p</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">spin</span><span class="p">,</span> <span class="mi" style="color: #099;">1</span><span class="p">));</span></span>
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<pre style="margin: 0;">+<span id="LC34" class="line" lang="c"> <span class="n" style="color: #333;">busy_wait_nop</span><span class="p">();</span></span>
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<pre style="margin: 0;">+<span id="LC35" class="line" lang="c"> <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;">IF_PROF_SPIN</span><span class="p">(</span><span class="n" style="color: #333;">RELAXED_ADD</span><span class="p">(</span><span class="o" style="font-weight: 600;">&</span><span class="n" style="color: #333;">p</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">yield</span><span class="p">,</span> <span class="mi" style="color: #099;">1</span><span class="p">));</span></span>
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<pre style="margin: 0;">+<span id="LC37" class="line" lang="c"> <span class="n" style="color: #333;">yieldThread</span><span class="p">();</span></span>
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<pre style="margin: 0;">+<span id="LC38" class="line" lang="c"> <span class="p">}</span> <span class="k" style="font-weight: 600;">while</span> <span class="p">(</span><span class="mi" style="color: #099;">1</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>
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<pre style="margin: 0;">+<span id="LC41" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#endif</span></span></pre>
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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">@@ -462,6 +462,7 @@ library</td>
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462
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<pre style="margin: 0;"> <span id="LC462" class="line" lang="plaintext"> STM.c</span>
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463
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463
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<pre style="margin: 0;"> <span id="LC463" class="line" lang="plaintext"> Schedule.c</span>
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464
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464
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<pre style="margin: 0;"> <span id="LC464" class="line" lang="plaintext"> Sparks.c</span>
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465
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<pre style="margin: 0;">+<span id="LC465" class="line" lang="plaintext"> SpinLock.c</span>
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465
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466
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<pre style="margin: 0;"> <span id="LC466" class="line" lang="plaintext"> StableName.c</span>
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467
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<pre style="margin: 0;"> <span id="LC467" class="line" lang="plaintext"> StablePtr.c</span>
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<pre style="margin: 0;"> <span id="LC468" class="line" lang="plaintext"> StaticPtrTable.c</span>
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