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| author | Frederic Weisbecker <fweisbec@gmail.com> | 2009-12-17 05:40:34 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2009-12-17 10:42:52 +0100 |
| commit | 06d65bda75341485d32f33da474b0664819ad497 (patch) | |
| tree | 3b5edc58b9c5a6a9b5cff4b5886f54929b12863a /arch/x86/mm | |
| parent | 61c1917f47f73c968e92d04d15370b1dc3ec4592 (diff) | |
| download | linux-06d65bda75341485d32f33da474b0664819ad497.tar.gz | |
perf events, x86/stacktrace: Fix performance/softlockup by providing a special frame pointer-only stack walker
It's just wasteful for stacktrace users like perf to walk through every entries on the stack whereas these only accept reliable ones, ie: that the frame pointer validates. Since perf requires pure reliable stacktraces, it needs a stack walker based on frame pointers-only to optimize the stacktrace processing. This might solve some near-lockup scenarios that can be triggered by call-graph tracing timer events. Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Paul Mackerras <paulus@samba.org> LKML-Reference: <1261024834-5336-2-git-send-regression-fweisbec@gmail.com> [ v2: fix for modular builds and small detail tidyup ] Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch/x86/mm')
0 files changed, 0 insertions, 0 deletions