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<dt>Revision</dt> <dd><a href="http://trac.webkit.org/projects/webkit/changeset/207199">207199</a></dd>
<dt>Author</dt> <dd>matthew_hanson@apple.com</dd>
<dt>Date</dt> <dd>2016-10-12 01:41:08 -0700 (Wed, 12 Oct 2016)</dd>
</dl>
<h3>Log Message</h3>
<pre>Merge <a href="http://trac.webkit.org/projects/webkit/changeset/204091">r204091</a>. rdar://problem/28476960</pre>
<h3>Modified Paths</h3>
<ul>
<li><a href="#branchessafari602branchSourcebmallocChangeLog">branches/safari-602-branch/Source/bmalloc/ChangeLog</a></li>
<li><a href="#branchessafari602branchSourcebmallocbmallocHeapcpp">branches/safari-602-branch/Source/bmalloc/bmalloc/Heap.cpp</a></li>
<li><a href="#branchessafari602branchSourcebmallocbmallocXLargeMapcpp">branches/safari-602-branch/Source/bmalloc/bmalloc/XLargeMap.cpp</a></li>
<li><a href="#branchessafari602branchSourcebmallocbmallocXLargeMaph">branches/safari-602-branch/Source/bmalloc/bmalloc/XLargeMap.h</a></li>
</ul>
</div>
<div id="patch">
<h3>Diff</h3>
<a id="branchessafari602branchSourcebmallocChangeLog"></a>
<div class="modfile"><h4>Modified: branches/safari-602-branch/Source/bmalloc/ChangeLog (207198 => 207199)</h4>
<pre class="diff"><span>
<span class="info">--- branches/safari-602-branch/Source/bmalloc/ChangeLog 2016-10-12 08:41:06 UTC (rev 207198)
+++ branches/safari-602-branch/Source/bmalloc/ChangeLog 2016-10-12 08:41:08 UTC (rev 207199)
</span><span class="lines">@@ -1,3 +1,35 @@
</span><ins>+2016-10-12 Matthew Hanson <matthew_hanson@apple.com>
+
+ Merge r204091. rdar://problem/28476960
+
+ 2016-08-03 Geoffrey Garen <ggaren@apple.com>
+
+ [bmalloc] Merging of XLargeRanges can leak the upper range
+ https://bugs.webkit.org/show_bug.cgi?id=160403
+
+ Reviewed by Michael Saboff.
+
+ * bmalloc/Heap.cpp:
+ (bmalloc::Heap::scavengeLargeObjects): Don't use removePhysical().
+ Recorded physical size is a performance optimization. It is not the
+ truth. So it might be zero even if a range contains physical pages.
+
+ Instead, iterate each range in the map unconditionally.
+
+ The map can shrink when we release the lock, so we must clamp our
+ iterator each time through the loop.
+
+ The map can grow when we release the lock, but we don't care because
+ growth restarts the scavenger from the beginning.
+
+ * bmalloc/XLargeMap.cpp:
+ (bmalloc::XLargeMap::removePhysical): Deleted. Not used anymore.
+
+ * bmalloc/XLargeMap.h:
+ (bmalloc::XLargeMap::ranges): Added direct access for the sake of
+ scavengeLargeObjects. (This violates our naming conventions -- I'll do
+ a rename in a follow-up patch.)
+
</ins><span class="cx"> 2016-07-13 Enrica Casucci <enrica@apple.com>
</span><span class="cx">
</span><span class="cx"> Update supported platforms in xcconfig files to match the sdk names.
</span></span></pre></div>
<a id="branchessafari602branchSourcebmallocbmallocHeapcpp"></a>
<div class="modfile"><h4>Modified: branches/safari-602-branch/Source/bmalloc/bmalloc/Heap.cpp (207198 => 207199)</h4>
<pre class="diff"><span>
<span class="info">--- branches/safari-602-branch/Source/bmalloc/bmalloc/Heap.cpp 2016-10-12 08:41:06 UTC (rev 207198)
+++ branches/safari-602-branch/Source/bmalloc/bmalloc/Heap.cpp 2016-10-12 08:41:08 UTC (rev 207199)
</span><span class="lines">@@ -131,13 +131,16 @@
</span><span class="cx">
</span><span class="cx"> void Heap::scavengeLargeObjects(std::unique_lock<StaticMutex>& lock, std::chrono::milliseconds sleepDuration)
</span><span class="cx"> {
</span><del>- while (XLargeRange range = m_largeFree.removePhysical()) {
</del><ins>+ auto& ranges = m_largeFree.ranges();
+ for (size_t i = ranges.size(); i-- > 0; i = std::min(i, ranges.size())) {
+ auto range = ranges.pop(i);
+
</ins><span class="cx"> lock.unlock();
</span><span class="cx"> vmDeallocatePhysicalPagesSloppy(range.begin(), range.size());
</span><span class="cx"> lock.lock();
</span><del>-
</del><ins>+
</ins><span class="cx"> range.setPhysicalSize(0);
</span><del>- m_largeFree.add(range);
</del><ins>+ ranges.push(range);
</ins><span class="cx">
</span><span class="cx"> waitUntilFalse(lock, sleepDuration, m_isAllocatingPages);
</span><span class="cx"> }
</span></span></pre></div>
<a id="branchessafari602branchSourcebmallocbmallocXLargeMapcpp"></a>
<div class="modfile"><h4>Modified: branches/safari-602-branch/Source/bmalloc/bmalloc/XLargeMap.cpp (207198 => 207199)</h4>
<pre class="diff"><span>
<span class="info">--- branches/safari-602-branch/Source/bmalloc/bmalloc/XLargeMap.cpp 2016-10-12 08:41:06 UTC (rev 207198)
+++ branches/safari-602-branch/Source/bmalloc/bmalloc/XLargeMap.cpp 2016-10-12 08:41:08 UTC (rev 207199)
</span><span class="lines">@@ -76,16 +76,4 @@
</span><span class="cx"> m_free.push(merged);
</span><span class="cx"> }
</span><span class="cx">
</span><del>-XLargeRange XLargeMap::removePhysical()
-{
- auto it = std::find_if(m_free.begin(), m_free.end(), [](const XLargeRange& range) {
- return range.physicalSize();
- });
-
- if (it == m_free.end())
- return XLargeRange();
-
- return m_free.pop(it);
-}
-
</del><span class="cx"> } // namespace bmalloc
</span></span></pre></div>
<a id="branchessafari602branchSourcebmallocbmallocXLargeMaph"></a>
<div class="modfile"><h4>Modified: branches/safari-602-branch/Source/bmalloc/bmalloc/XLargeMap.h (207198 => 207199)</h4>
<pre class="diff"><span>
<span class="info">--- branches/safari-602-branch/Source/bmalloc/bmalloc/XLargeMap.h 2016-10-12 08:41:06 UTC (rev 207198)
+++ branches/safari-602-branch/Source/bmalloc/bmalloc/XLargeMap.h 2016-10-12 08:41:08 UTC (rev 207199)
</span><span class="lines">@@ -36,7 +36,7 @@
</span><span class="cx"> public:
</span><span class="cx"> void add(const XLargeRange&);
</span><span class="cx"> XLargeRange remove(size_t alignment, size_t);
</span><del>- XLargeRange removePhysical();
</del><ins>+ Vector<XLargeRange>& ranges() { return m_free; }
</ins><span class="cx">
</span><span class="cx"> private:
</span><span class="cx"> Vector<XLargeRange> m_free;
</span></span></pre>
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