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<dt>Revision</dt> <dd><a href="http://trac.webkit.org/projects/webkit/changeset/198829">198829</a></dd>
<dt>Author</dt> <dd>ggaren@apple.com</dd>
<dt>Date</dt> <dd>2016-03-29 23:42:36 -0700 (Tue, 29 Mar 2016)</dd>
</dl>
<h3>Log Message</h3>
<pre>bmalloc: support physical page sizes that don't match the virtual page size (take 2)
https://bugs.webkit.org/show_bug.cgi?id=156003
Reviewed by Andreas Kling.
This is a memory savings on iOS devices where the virtual page size
is 16kB but the physical page size is 4kB.
Take 1 was a memory regression on 16kB virtual / 16kB physical systems
because it used a 4kB page size within a 16kB page size, allowing up to
4 different object types to mix within a physical page. Because objects
of the same type tend to deallocate at the same time, mixing objects of
different types made pages less likely to become completely empty.
(Take 1 also had a bug where it used a platform #ifdef that didn't exist.
Oops.)
Take 2 allocates units of SmallPages equal to the physical page size.
* bmalloc/Heap.cpp:
(bmalloc::Heap::Heap):
(bmalloc::Heap::initializeLineMetadata):
(bmalloc::Heap::allocateSmallBumpRanges):
(bmalloc::Heap::allocateSmallPage):
(bmalloc::Heap::allocateLarge):
(bmalloc::Heap::splitAndAllocate):
(bmalloc::Heap::tryAllocateXLarge):
(bmalloc::Heap::shrinkXLarge):
* bmalloc/Heap.h: Use the physical page size for our VM operations because
we're only concerned with returning physical pages to the OS.
* bmalloc/VMAllocate.h:
(bmalloc::vmPageSize):
(bmalloc::vmPageShift):
(bmalloc::vmSize):
(bmalloc::vmValidate):
(bmalloc::vmPageSizePhysical):
(bmalloc::vmValidatePhysical):
(bmalloc::tryVMAllocate):
(bmalloc::vmDeallocatePhysicalPages):
(bmalloc::vmAllocatePhysicalPages):
(bmalloc::vmDeallocatePhysicalPagesSloppy):
(bmalloc::vmAllocatePhysicalPagesSloppy): Use the physical page size.</pre>
<h3>Modified Paths</h3>
<ul>
<li><a href="#trunkSourcebmallocChangeLog">trunk/Source/bmalloc/ChangeLog</a></li>
<li><a href="#trunkSourcebmallocbmallocHeapcpp">trunk/Source/bmalloc/bmalloc/Heap.cpp</a></li>
<li><a href="#trunkSourcebmallocbmallocHeaph">trunk/Source/bmalloc/bmalloc/Heap.h</a></li>
<li><a href="#trunkSourcebmallocbmallocVMAllocateh">trunk/Source/bmalloc/bmalloc/VMAllocate.h</a></li>
</ul>
</div>
<div id="patch">
<h3>Diff</h3>
<a id="trunkSourcebmallocChangeLog"></a>
<div class="modfile"><h4>Modified: trunk/Source/bmalloc/ChangeLog (198828 => 198829)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/bmalloc/ChangeLog 2016-03-30 06:00:22 UTC (rev 198828)
+++ trunk/Source/bmalloc/ChangeLog 2016-03-30 06:42:36 UTC (rev 198829)
</span><span class="lines">@@ -1,5 +1,51 @@
</span><span class="cx"> 2016-03-29 Geoffrey Garen <ggaren@apple.com>
</span><span class="cx">
</span><ins>+ bmalloc: support physical page sizes that don't match the virtual page size (take 2)
+ https://bugs.webkit.org/show_bug.cgi?id=156003
+
+ Reviewed by Andreas Kling.
+
+ This is a memory savings on iOS devices where the virtual page size
+ is 16kB but the physical page size is 4kB.
+
+ Take 1 was a memory regression on 16kB virtual / 16kB physical systems
+ because it used a 4kB page size within a 16kB page size, allowing up to
+ 4 different object types to mix within a physical page. Because objects
+ of the same type tend to deallocate at the same time, mixing objects of
+ different types made pages less likely to become completely empty.
+
+ (Take 1 also had a bug where it used a platform #ifdef that didn't exist.
+ Oops.)
+
+ Take 2 allocates units of SmallPages equal to the physical page size.
+
+ * bmalloc/Heap.cpp:
+ (bmalloc::Heap::Heap):
+ (bmalloc::Heap::initializeLineMetadata):
+ (bmalloc::Heap::allocateSmallBumpRanges):
+ (bmalloc::Heap::allocateSmallPage):
+ (bmalloc::Heap::allocateLarge):
+ (bmalloc::Heap::splitAndAllocate):
+ (bmalloc::Heap::tryAllocateXLarge):
+ (bmalloc::Heap::shrinkXLarge):
+ * bmalloc/Heap.h: Use the physical page size for our VM operations because
+ we're only concerned with returning physical pages to the OS.
+
+ * bmalloc/VMAllocate.h:
+ (bmalloc::vmPageSize):
+ (bmalloc::vmPageShift):
+ (bmalloc::vmSize):
+ (bmalloc::vmValidate):
+ (bmalloc::vmPageSizePhysical):
+ (bmalloc::vmValidatePhysical):
+ (bmalloc::tryVMAllocate):
+ (bmalloc::vmDeallocatePhysicalPages):
+ (bmalloc::vmAllocatePhysicalPages):
+ (bmalloc::vmDeallocatePhysicalPagesSloppy):
+ (bmalloc::vmAllocatePhysicalPagesSloppy): Use the physical page size.
+
+2016-03-29 Geoffrey Garen <ggaren@apple.com>
+
</ins><span class="cx"> bmalloc: page size should be configurable at runtime
</span><span class="cx"> https://bugs.webkit.org/show_bug.cgi?id=155993
</span><span class="cx">
</span></span></pre></div>
<a id="trunkSourcebmallocbmallocHeapcpp"></a>
<div class="modfile"><h4>Modified: trunk/Source/bmalloc/bmalloc/Heap.cpp (198828 => 198829)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/bmalloc/bmalloc/Heap.cpp 2016-03-30 06:00:22 UTC (rev 198828)
+++ trunk/Source/bmalloc/bmalloc/Heap.cpp 2016-03-30 06:42:36 UTC (rev 198829)
</span><span class="lines">@@ -35,11 +35,15 @@
</span><span class="cx"> namespace bmalloc {
</span><span class="cx">
</span><span class="cx"> Heap::Heap(std::lock_guard<StaticMutex>&)
</span><del>- : m_vmPageSize(vmPageSize())
</del><ins>+ : m_vmPageSizePhysical(vmPageSizePhysical())
</ins><span class="cx"> , m_largeObjects(VMState::HasPhysical::True)
</span><span class="cx"> , m_isAllocatingPages(false)
</span><span class="cx"> , m_scavenger(*this, &Heap::concurrentScavenge)
</span><span class="cx"> {
</span><ins>+ RELEASE_BASSERT(vmPageSizePhysical() >= smallPageSize);
+ RELEASE_BASSERT(vmPageSize() >= vmPageSizePhysical());
+ RELEASE_BASSERT(xLargeAlignment >= vmPageSize());
+
</ins><span class="cx"> initializeLineMetadata();
</span><span class="cx"> }
</span><span class="cx">
</span><span class="lines">@@ -47,7 +51,7 @@
</span><span class="cx"> {
</span><span class="cx"> // We assume that m_smallLineMetadata is zero-filled.
</span><span class="cx">
</span><del>- size_t smallLineCount = m_vmPageSize / smallLineSize;
</del><ins>+ size_t smallLineCount = m_vmPageSizePhysical / smallLineSize;
</ins><span class="cx"> m_smallLineMetadata.grow(sizeClassCount * smallLineCount);
</span><span class="cx">
</span><span class="cx"> for (size_t sizeClass = 0; sizeClass < sizeClassCount; ++sizeClass) {
</span><span class="lines">@@ -56,7 +60,7 @@
</span><span class="cx">
</span><span class="cx"> size_t object = 0;
</span><span class="cx"> size_t line = 0;
</span><del>- while (object < m_vmPageSize) {
</del><ins>+ while (object < m_vmPageSizePhysical) {
</ins><span class="cx"> line = object / smallLineSize;
</span><span class="cx"> size_t leftover = object % smallLineSize;
</span><span class="cx">
</span><span class="lines">@@ -70,7 +74,7 @@
</span><span class="cx"> }
</span><span class="cx">
</span><span class="cx"> // Don't allow the last object in a page to escape the page.
</span><del>- if (object > m_vmPageSize) {
</del><ins>+ if (object > m_vmPageSizePhysical) {
</ins><span class="cx"> BASSERT(pageMetadata[line].objectCount);
</span><span class="cx"> --pageMetadata[line].objectCount;
</span><span class="cx"> }
</span><span class="lines">@@ -152,7 +156,7 @@
</span><span class="cx"> SmallPage* page = allocateSmallPage(lock, sizeClass);
</span><span class="cx"> SmallLine* lines = page->begin();
</span><span class="cx"> BASSERT(page->hasFreeLines(lock));
</span><del>- size_t smallLineCount = m_vmPageSize / smallLineSize;
</del><ins>+ size_t smallLineCount = m_vmPageSizePhysical / smallLineSize;
</ins><span class="cx"> LineMetadata* pageMetadata = &m_smallLineMetadata[sizeClass * smallLineCount];
</span><span class="cx">
</span><span class="cx"> // Find a free line.
</span><span class="lines">@@ -211,8 +215,8 @@
</span><span class="cx"> return page;
</span><span class="cx"> }
</span><span class="cx">
</span><del>- size_t unalignedSize = largeMin + m_vmPageSize - largeAlignment + m_vmPageSize;
- LargeObject largeObject = allocateLarge(lock, m_vmPageSize, m_vmPageSize, unalignedSize);
</del><ins>+ size_t unalignedSize = largeMin + m_vmPageSizePhysical - largeAlignment + m_vmPageSizePhysical;
+ LargeObject largeObject = allocateLarge(lock, m_vmPageSizePhysical, m_vmPageSizePhysical, unalignedSize);
</ins><span class="cx">
</span><span class="cx"> // Transform our large object into a small object page. We deref here
</span><span class="cx"> // because our small objects will keep their own line refcounts.
</span><span class="lines">@@ -222,10 +226,10 @@
</span><span class="cx">
</span><span class="cx"> SmallPage* page = object.page();
</span><span class="cx"> page->setSizeClass(sizeClass);
</span><del>- page->setSmallPageCount(m_vmPageSize / smallPageSize);
</del><ins>+ page->setSmallPageCount(m_vmPageSizePhysical / smallPageSize);
</ins><span class="cx">
</span><span class="cx"> // Set a slide() value on intermediate SmallPages so they hash to their
</span><del>- // vmPageSize-sized page.
</del><ins>+ // vmPageSizePhysical-sized page.
</ins><span class="cx"> for (size_t i = 1; i < page->smallPageCount(); ++i)
</span><span class="cx"> page[i].setSlide(i);
</span><span class="cx">
</span><span class="lines">@@ -326,7 +330,7 @@
</span><span class="cx"> BASSERT(size >= largeMin);
</span><span class="cx"> BASSERT(size == roundUpToMultipleOf<largeAlignment>(size));
</span><span class="cx">
</span><del>- if (size <= m_vmPageSize)
</del><ins>+ if (size <= m_vmPageSizePhysical)
</ins><span class="cx"> scavengeSmallPages(lock);
</span><span class="cx">
</span><span class="cx"> LargeObject largeObject = m_largeObjects.take(size);
</span><span class="lines">@@ -357,7 +361,7 @@
</span><span class="cx"> BASSERT(alignment >= largeAlignment);
</span><span class="cx"> BASSERT(isPowerOfTwo(alignment));
</span><span class="cx">
</span><del>- if (size <= m_vmPageSize)
</del><ins>+ if (size <= m_vmPageSizePhysical)
</ins><span class="cx"> scavengeSmallPages(lock);
</span><span class="cx">
</span><span class="cx"> LargeObject largeObject = m_largeObjects.take(alignment, size, unalignedSize);
</span><span class="lines">@@ -431,7 +435,7 @@
</span><span class="cx"> // in the allocated list. This is an important optimization because it
</span><span class="cx"> // keeps the free list short, speeding up allocation and merging.
</span><span class="cx">
</span><del>- std::pair<XLargeRange, XLargeRange> allocated = range.split(roundUpToMultipleOf(m_vmPageSize, size));
</del><ins>+ std::pair<XLargeRange, XLargeRange> allocated = range.split(roundUpToMultipleOf(m_vmPageSizePhysical, size));
</ins><span class="cx"> if (allocated.first.vmState().hasVirtual()) {
</span><span class="cx"> vmAllocatePhysicalPagesSloppy(allocated.first.begin(), allocated.first.size());
</span><span class="cx"> allocated.first.setVMState(VMState::Physical);
</span><span class="lines">@@ -448,7 +452,7 @@
</span><span class="cx">
</span><span class="cx"> m_isAllocatingPages = true;
</span><span class="cx">
</span><del>- size = std::max(m_vmPageSize, size);
</del><ins>+ size = std::max(m_vmPageSizePhysical, size);
</ins><span class="cx"> alignment = roundUpToMultipleOf<xLargeAlignment>(alignment);
</span><span class="cx">
</span><span class="cx"> XLargeRange range = m_xLargeMap.takeFree(alignment, size);
</span><span class="lines">@@ -475,7 +479,7 @@
</span><span class="cx"> {
</span><span class="cx"> BASSERT(object.size() > newSize);
</span><span class="cx">
</span><del>- if (object.size() - newSize < m_vmPageSize)
</del><ins>+ if (object.size() - newSize < m_vmPageSizePhysical)
</ins><span class="cx"> return;
</span><span class="cx">
</span><span class="cx"> XLargeRange range = m_xLargeMap.takeAllocated(object.begin());
</span></span></pre></div>
<a id="trunkSourcebmallocbmallocHeaph"></a>
<div class="modfile"><h4>Modified: trunk/Source/bmalloc/bmalloc/Heap.h (198828 => 198829)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/bmalloc/bmalloc/Heap.h 2016-03-30 06:00:22 UTC (rev 198828)
+++ trunk/Source/bmalloc/bmalloc/Heap.h 2016-03-30 06:42:36 UTC (rev 198829)
</span><span class="lines">@@ -93,7 +93,7 @@
</span><span class="cx"> void scavengeLargeObjects(std::unique_lock<StaticMutex>&, std::chrono::milliseconds);
</span><span class="cx"> void scavengeXLargeObjects(std::unique_lock<StaticMutex>&, std::chrono::milliseconds);
</span><span class="cx">
</span><del>- size_t m_vmPageSize;
</del><ins>+ size_t m_vmPageSizePhysical;
</ins><span class="cx">
</span><span class="cx"> Vector<LineMetadata> m_smallLineMetadata;
</span><span class="cx">
</span></span></pre></div>
<a id="trunkSourcebmallocbmallocVMAllocateh"></a>
<div class="modfile"><h4>Modified: trunk/Source/bmalloc/bmalloc/VMAllocate.h (198828 => 198829)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/bmalloc/bmalloc/VMAllocate.h 2016-03-30 06:00:22 UTC (rev 198828)
+++ trunk/Source/bmalloc/bmalloc/VMAllocate.h 2016-03-30 06:42:36 UTC (rev 198829)
</span><span class="lines">@@ -36,6 +36,7 @@
</span><span class="cx"> #include <unistd.h>
</span><span class="cx">
</span><span class="cx"> #if BOS(DARWIN)
</span><ins>+#include <mach/vm_page_size.h>
</ins><span class="cx"> #include <mach/vm_statistics.h>
</span><span class="cx"> #endif
</span><span class="cx">
</span><span class="lines">@@ -49,12 +50,18 @@
</span><span class="cx">
</span><span class="cx"> inline size_t vmPageSize()
</span><span class="cx"> {
</span><del>- return sysconf(_SC_PAGESIZE);
</del><ins>+ static size_t cached;
+ if (!cached)
+ cached = sysconf(_SC_PAGESIZE);
+ return cached;
</ins><span class="cx"> }
</span><span class="cx">
</span><span class="cx"> inline size_t vmPageShift()
</span><span class="cx"> {
</span><del>- return log2(vmPageSize());
</del><ins>+ static size_t cached;
+ if (!cached)
+ cached = log2(vmPageSize());
+ return cached;
</ins><span class="cx"> }
</span><span class="cx">
</span><span class="cx"> inline size_t vmSize(size_t size)
</span><span class="lines">@@ -78,6 +85,34 @@
</span><span class="cx"> BASSERT(p == mask(p, ~(vmPageSize() - 1)));
</span><span class="cx"> }
</span><span class="cx">
</span><ins>+inline size_t vmPageSizePhysical()
+{
+#if (BPLATFORM(IOS) && __IPHONE_OS_VERSION_MIN_REQUIRED >= 100000)
+ return vm_kernel_page_size;
+#else
+ static size_t cached;
+ if (!cached)
+ cached = sysconf(_SC_PAGESIZE);
+ return cached;
+#endif
+}
+
+inline void vmValidatePhysical(size_t vmSize)
+{
+ UNUSED(vmSize);
+ BASSERT(vmSize);
+ BASSERT(vmSize == roundUpToMultipleOf(vmPageSizePhysical(), vmSize));
+}
+
+inline void vmValidatePhysical(void* p, size_t vmSize)
+{
+ vmValidatePhysical(vmSize);
+
+ UNUSED(p);
+ BASSERT(p);
+ BASSERT(p == mask(p, ~(vmPageSizePhysical() - 1)));
+}
+
</ins><span class="cx"> inline void* tryVMAllocate(size_t vmSize)
</span><span class="cx"> {
</span><span class="cx"> vmValidate(vmSize);
</span><span class="lines">@@ -139,7 +174,7 @@
</span><span class="cx">
</span><span class="cx"> inline void vmDeallocatePhysicalPages(void* p, size_t vmSize)
</span><span class="cx"> {
</span><del>- vmValidate(p, vmSize);
</del><ins>+ vmValidatePhysical(p, vmSize);
</ins><span class="cx"> #if BOS(DARWIN)
</span><span class="cx"> SYSCALL(madvise(p, vmSize, MADV_FREE_REUSABLE));
</span><span class="cx"> #else
</span><span class="lines">@@ -149,7 +184,7 @@
</span><span class="cx">
</span><span class="cx"> inline void vmAllocatePhysicalPages(void* p, size_t vmSize)
</span><span class="cx"> {
</span><del>- vmValidate(p, vmSize);
</del><ins>+ vmValidatePhysical(p, vmSize);
</ins><span class="cx"> #if BOS(DARWIN)
</span><span class="cx"> SYSCALL(madvise(p, vmSize, MADV_FREE_REUSE));
</span><span class="cx"> #else
</span><span class="lines">@@ -160,8 +195,8 @@
</span><span class="cx"> // Trims requests that are un-page-aligned.
</span><span class="cx"> inline void vmDeallocatePhysicalPagesSloppy(void* p, size_t size)
</span><span class="cx"> {
</span><del>- char* begin = roundUpToMultipleOf(vmPageSize(), static_cast<char*>(p));
- char* end = roundDownToMultipleOf(vmPageSize(), static_cast<char*>(p) + size);
</del><ins>+ char* begin = roundUpToMultipleOf(vmPageSizePhysical(), static_cast<char*>(p));
+ char* end = roundDownToMultipleOf(vmPageSizePhysical(), static_cast<char*>(p) + size);
</ins><span class="cx">
</span><span class="cx"> if (begin >= end)
</span><span class="cx"> return;
</span><span class="lines">@@ -172,8 +207,8 @@
</span><span class="cx"> // Expands requests that are un-page-aligned.
</span><span class="cx"> inline void vmAllocatePhysicalPagesSloppy(void* p, size_t size)
</span><span class="cx"> {
</span><del>- char* begin = roundDownToMultipleOf(vmPageSize(), static_cast<char*>(p));
- char* end = roundUpToMultipleOf(vmPageSize(), static_cast<char*>(p) + size);
</del><ins>+ char* begin = roundDownToMultipleOf(vmPageSizePhysical(), static_cast<char*>(p));
+ char* end = roundUpToMultipleOf(vmPageSizePhysical(), static_cast<char*>(p) + size);
</ins><span class="cx">
</span><span class="cx"> if (begin >= end)
</span><span class="cx"> return;
</span></span></pre>
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