Messages in this thread | | | Date | Sat, 13 Jun 2009 13:02:29 +0200 | From | Ingo Molnar <> | Subject | Re: [PATCH 2/2] perfcounters: print a sorted summary of annotated overhead lines |
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* Frederic Weisbecker <fweisbec@gmail.com> wrote:
> It's can be very annoying to scroll down perf annotated output > until we find relevant overhead. > > Using the -l option, you can now have a small summary sorted per > overhead in the beginning of the output. > > Example: > > ./perf annotate -l -k ../../vmlinux -s __lock_acquire > > Sorted summary for file ../../vmlinux > ---------------------------------------------- > > 12.04 /home/fweisbec/linux/linux-2.6-tip/kernel/lockdep.c:1653 > 4.61 /home/fweisbec/linux/linux-2.6-tip/kernel/lockdep.c:1740 > 3.77 /home/fweisbec/linux/linux-2.6-tip/kernel/lockdep.c:1775 > 3.56 /home/fweisbec/linux/linux-2.6-tip/kernel/lockdep.c:1653 > 2.93 /home/fweisbec/linux/linux-2.6-tip/arch/x86/include/asm/irqflags.h:15 > 2.83 /home/fweisbec/linux/linux-2.6-tip/kernel/lockdep.c:2545 > 2.30 /home/fweisbec/linux/linux-2.6-tip/kernel/lockdep.c:2594 > 2.20 /home/fweisbec/linux/linux-2.6-tip/kernel/lockdep.c:2388 > 2.20 /home/fweisbec/linux/linux-2.6-tip/kernel/lockdep.c:730 > 2.09 /home/fweisbec/linux/linux-2.6-tip/kernel/lockdep.c:730 > 2.09 /home/fweisbec/linux/linux-2.6-tip/kernel/lockdep.c:138 > 1.88 /home/fweisbec/linux/linux-2.6-tip/kernel/lockdep.c:2548 > 1.47 /home/fweisbec/linux/linux-2.6-tip/arch/x86/include/asm/irqflags.h:15 > 1.36 /home/fweisbec/linux/linux-2.6-tip/kernel/lockdep.c:2594 > 1.36 /home/fweisbec/linux/linux-2.6-tip/kernel/lockdep.c:730 > 1.26 /home/fweisbec/linux/linux-2.6-tip/kernel/lockdep.c:1654 > 1.26 /home/fweisbec/linux/linux-2.6-tip/kernel/lockdep.c:1653
Nice!
I'm wondering how hard it would be to add wildcard support to the symbol matching, say:
perf annotate "sys_*" # Annotate all syscalls perf annotate "sched*" # All scheduler functions perf annotate "*" # All symbols we know about
It would be slower, obviously - but pretty useful as well.
Also, perhaps an 'annotate top 10 overhead functions':
perf annotate --top 10
Would be popular too ...
Ingo
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