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| author | Frederic Weisbecker <[email protected]> | 2009-12-17 04:40:34 +0000 |
|---|---|---|
| committer | Ingo Molnar <[email protected]> | 2009-12-17 09:42:52 +0000 |
| commit | 06d65bda75341485d32f33da474b0664819ad497 (patch) | |
| tree | 3b5edc58b9c5a6a9b5cff4b5886f54929b12863a /lib/string.c | |
| parent | perf events, x86/stacktrace: Make stack walking optional (diff) | |
| download | kernel-06d65bda75341485d32f33da474b0664819ad497.tar.gz kernel-06d65bda75341485d32f33da474b0664819ad497.zip | |
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 <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Arnaldo Carvalho de Melo <[email protected]>
Cc: Paul Mackerras <[email protected]>
LKML-Reference: <[email protected]>
[ v2: fix for modular builds and small detail tidyup ]
Signed-off-by: Ingo Molnar <[email protected]>
Diffstat (limited to 'lib/string.c')
0 files changed, 0 insertions, 0 deletions