* [PATCH tip 0/5] perf: make top share sym routines with report
@ 2009-05-28 17:54 Arnaldo Carvalho de Melo
2009-05-28 22:00 ` Ingo Molnar
0 siblings, 1 reply; 2+ messages in thread
From: Arnaldo Carvalho de Melo @ 2009-05-28 17:54 UTC (permalink / raw)
To: Ingo Molnar, Peter Zijlstra
Cc: Paul Mackerras, Mike Galbraith, Thomas Gleixner, Steven Rostedt,
Linux Kernel Mailing List
Haven't done and perf stat runs tho. Perhaps ask for running it for 5
refreshes and then exit.
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: [PATCH tip 0/5] perf: make top share sym routines with report
2009-05-28 17:54 [PATCH tip 0/5] perf: make top share sym routines with report Arnaldo Carvalho de Melo
@ 2009-05-28 22:00 ` Ingo Molnar
0 siblings, 0 replies; 2+ messages in thread
From: Ingo Molnar @ 2009-05-28 22:00 UTC (permalink / raw)
To: Arnaldo Carvalho de Melo
Cc: Peter Zijlstra, Paul Mackerras, Mike Galbraith, Thomas Gleixner,
Steven Rostedt, Linux Kernel Mailing List
* Arnaldo Carvalho de Melo <acme@redhat.com> wrote:
> Haven't done and perf stat runs tho. Perhaps ask for running it
> for 5 refreshes and then exit.
I've benchmarked it. With about half a million sample IRQs per
second on a 16way x86 box the overhead went from 22.3%:
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME COMMAND
4701 mingo 20 0 423m 61m 1796 R 22.3 0.5 0:08.11 perf
down to:
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME COMMAND
3386 mingo 20 0 88068 61m 1756 R 18.2 0.5 0:03.06 perf
So it's a ~22% speedup.
Also, there's much less virtual memory used as well - a factor of 5
reduction (!).
Applied and pushed out - thanks Arnaldo!
Ingo
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