Re: [RFC] [PATCH] Performance of del_timer_sync

From: Geoff Gustafson
Date: Tue May 11 2004 - 13:39:07 EST

Andrew Morton wrote:
> Geoff Gustafson <geoff@xxxxxxxxxxxxxxxxxx> wrote:
>> I started this patch based on profiling an enterprise database
>> application on a 32p IA64 NUMA machine, where del_timer_sync was
>> one of the top few functions taking CPU time in the kernel.
> Do you know where it's being called from?

OK, the main sources were:

sys_semtimedop() -> schedule_timeout()

sys_io_getevents() -> read_events() -> clear_timeout()

- Geoff

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