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17 May 2024, 09:02:56 UTC
Revision 764e16a30a77a9c8346fbae6615e7c818ce9d00f authored by David Ahern on 25 August 2011, 16:17:55 UTC, committed by Arnaldo Carvalho de Melo on 23 September 2011, 17:36:53 UTC 
perf record: Create events initially disabled and enable after init
 
perf-record currently creates events enabled. When doing a system wide
collection (-a arg) this causes data collection for perf's
initialization activities -- eg., perf_event__synthesize_threads().

For some events (e.g., context switch S/W event or tracepoints like
syscalls) perf's initialization causes a lot of events to be captured
frequently generating "Check IO/CPU overload!" warnings on larger
systems (e.g., 2 socket, quad core, hyperthreading).

perf's initialization phase can be skipped by creating events
disabled and then enabling them once the initialization is done.

Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/1314289075-14706-1-git-send-email-dsahern@gmail.com
Signed-off-by: David Ahern <dsahern@gmail.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
1 parent 694bf40
History
Tip revision: 764e16a30a77a9c8346fbae6615e7c818ce9d00f authored by David Ahern on 25 August 2011, 16:17:55 UTC
perf record: Create events initially disabled and enable after init
Tip revision: 764e16a
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