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Bug 1878806 - pt 2. Add about:memory entries for fresh and madvised pages r=mccr8,glandium

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Differential Revision: https://phabricator.services.mozilla.com/D200750
This commit is contained in:
Paul Bone 2024-03-26 05:06:15 +00:00
parent 4440259d29
commit c9a81070e3
1 changed files with 28 additions and 2 deletions
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30
xpcom/base/nsMemoryReporterManager.cpp
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@ -1308,7 +1308,7 @@ class JemallocHeapReporter final : public nsIMemoryReporter {
stats.waste,
"Committed bytes which do not correspond to an active allocation and which the "
"allocator is not intentionally keeping alive (i.e., not "
"'heap/{bookkeeping,page-cache,bin-unused}').");
"'heap/{bookkeeping,unused-pages,bin-unused}').");
}
MOZ_COLLECT_REPORT(
@ -1317,13 +1317,39 @@ class JemallocHeapReporter final : public nsIMemoryReporter {
"Committed bytes which the heap allocator uses for internal data structures.");
MOZ_COLLECT_REPORT(
"heap/committed/page-cache", KIND_NONHEAP, UNITS_BYTES,
"heap/committed/unused-pages/dirty", KIND_NONHEAP, UNITS_BYTES,
stats.page_cache,
"Memory which the allocator could return to the operating system, but hasn't. "
"The allocator keeps this memory around as an optimization, so it doesn't "
"have to ask the OS the next time it needs to fulfill a request. This value "
"is typically not larger than a few megabytes.");
MOZ_COLLECT_REPORT(
"heap/decommitted/unused-pages/fresh", KIND_OTHER, UNITS_BYTES, stats.pages_fresh,
"Amount of memory currently mapped but has never been used.");
// A duplicate entry in the decommitted part of the tree.
MOZ_COLLECT_REPORT(
"decommitted/heap/unused-pages/fresh", KIND_OTHER, UNITS_BYTES, stats.pages_fresh,
"Amount of memory currently mapped but has never been used.");
// On MacOS madvised memory is still counted in the resident set until the OS
// actually decommits it.
#ifdef XP_MACOSX
#define MADVISED_GROUP "committed"
#else
#define MADVISED_GROUP "decommitted"
#endif
MOZ_COLLECT_REPORT(
"heap/" MADVISED_GROUP "/unused-pages/madvised", KIND_OTHER, UNITS_BYTES,
stats.pages_madvised,
"Amount of memory currently mapped, not used and that the OS should remove "
"from the application's resident set.");
// A duplicate entry in the decommitted part of the tree.
MOZ_COLLECT_REPORT(
"decommitted/heap/unused-pages/madvised", KIND_OTHER, UNITS_BYTES, stats.pages_madvised,
"Amount of memory currently mapped, not used and that the OS should remove "
"from the application's resident set.");
{
size_t decommitted = stats.mapped - stats.allocated - stats.waste - stats.page_cache - stats.pages_fresh - stats.bookkeeping - stats.bin_unused;
MOZ_COLLECT_REPORT(