|getReportsForThisProcess| differs from |getReports| in that it is limited to current process and is synchronous. When asynchronous memory reporters are added the function will no longer be able tobe synchronous. There isn't much utility in only measuring the current process, so we can remove the function and switch existing users to |getReports|.
The calculation of |explicit| relies on the synchronous |getReportsForThisProcess|, once we have asynchronous reporters this will no longer work. As it is currently referenced in the about::memory tests we can just remove it.
Jemalloc 4 purges dirty pages regularly during free() when the ratio of dirty
pages compared to active pages is higher than 1 << lg_dirty_mult. We set
lg_dirty_mult in jemalloc_config to limit RSS usage, but it also has an impact
on performance.
So instead of enforcing a high ratio to force more pages being purged, we keep
jemalloc's default ratio of 8, and force a regular purge of all dirty pages,
after cycle collection.
Keeping jemalloc's default ratio avoids cycle-collection-triggered purge to
have to go through really all dirty pages when there are a lot, in which case
the normal jemalloc purge during free() will already have kicked in. It also
takes care of everything that doesn't run the cycle collector still having
a level of purge, like plugins in the plugin-container.
At the same time, since jemalloc_purge_freed_pages does nothing with jemalloc 4,
repurpose the MEMORY_FREE_PURGED_PAGES_MS telemetry probe to track the time
spent in this cycle-collector-triggered purge.
The bulk of this commit was generated by running:
run-clang-tidy.py \
-checks='-*,llvm-namespace-comment' \
-header-filter=^/.../mozilla-central/.* \
-fix
This changes the way nsMemoryReporterManger handles child processes;
instead of using an observer message and trying to keep a count of child
processes expected to answer, it directly iterates a copy of the list
of content processes and explicitly handles children which exit before
their reports start.
Note that GC/CC logs still run at full concurrency, and that no child
reports start until the parent is finished (see bug 1151597) regardless
of concurrency limit.
This changes the way nsMemoryReporterManger handles child processes;
instead of using an observer message and trying to keep a count of child
processes expected to answer, it directly iterates a copy of the list
of content processes and explicitly handles children which exit before
their reports start.
Note that GC/CC logs still run at full concurrency, and that no child
reports start until the parent is finished (see bug 1151597) regardless
of concurrency limit.
The new "num" property lets identical blocks be aggregated in the output. This
patch only uses the "num" property for dead blocks, because that's where the
greatest potential benefit lies, but it could be used for live blocks as well.
On one test case (a complex PDF file) running with --mode=cumulative
--sample-below=1 this patch had the following effects.
- Change in running speed was negligible.
- Compressed output file size dropped from 8.8 to 5.0 MB.
- Compressed output file size dropped from 297 to 50 MB.
- dmd.py runtime (without stack fixing) dropped from 30 to 8 seconds.
--HG--
extra : rebase_source : 46a32058cd5c31cd823fe3f1accb5e68bcd320f3
This is to give better contrast with |DeadBlock|, which will be added in the
next patch.
--HG--
extra : rebase_source : cbc767fcc5667cfed108ca7c4ebf1d7e82aa185e
