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Bug 675216 - Update about:memory's description of heap-committed. rs=njn

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This commit is contained in:
Justin Lebar 2011-08-06 11:01:36 -04:00
parent 942485f53d
commit 310504b74a
1 changed files with 8 additions and 10 deletions
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18
xpcom/base/nsMemoryReporterManager.cpp
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@ -308,16 +308,14 @@ NS_MEMORY_REPORTER_IMPLEMENT(HeapCommitted,
KIND_OTHER,
UNITS_BYTES,
GetHeapCommitted,
"Memory mapped by the heap allocator that is committed, i.e. in physical "
"memory or paged to disk. The allocator may map blocks of many pages and "
"then hand out only some of those pages in response to a call to malloc. "
"Only those pages which have been handed out to the application are counted "
"as committed -- the OS lazily assigns physical pages to mappings, so those "
"pages which the allocator has not handed out haven't been written to and "
"therefore don't have a corresponding physical page. (Of course, the "
"application may malloc pages and free them without ever writing to the "
"pages and causing them to be committed. But the allocator conservatively "
"assumes that the application writes to all pages it receives.)")
"This number reported only for completeness; it is not particularly "
"meaningful. On Windows, all mapped memory is committed (because jemalloc's "
"MALLOC_DECOMMIT flag is set). Thus heap-committed should equal "
"heap-allocated + heap-unallocated. Elsewhere, jemalloc uses "
"madvise(DONT_NEED) to instruct the OS to drop the physical memory backing "
"pages the allocator doesn't need. In this case, jemalloc counts the memory "
"as 'committed', but it's not taking up any space in physical memory or in "
"the swap file.")
NS_MEMORY_REPORTER_IMPLEMENT(HeapDirty,
"heap-dirty",