diff options
| author | Frederic Weisbecker <[email protected]> | 2009-12-17 05:40:34 +0100 |
|---|---|---|
| committer | Ingo Molnar <[email protected]> | 2009-12-17 10:42:52 +0100 |
| commit | 06d65bda75341485d32f33da474b0664819ad497 (patch) | |
| tree | 3b5edc58b9c5a6a9b5cff4b5886f54929b12863a /tools/perf/scripts/python/Perf-Trace-Util/lib/Perf | |
| parent | 61c1917f47f73c968e92d04d15370b1dc3ec4592 (diff) | |
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 'tools/perf/scripts/python/Perf-Trace-Util/lib/Perf')
0 files changed, 0 insertions, 0 deletions