Frederic Weisbecker 06d65bda75 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>		2009-12-17 10:42:52 +01:00
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asm	perf events, x86/stacktrace: Fix performance/softlockup by providing a special frame pointer-only stack walker	2009-12-17 10:42:52 +01:00