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SubjectRe: [PATCH v2 0/4] ipc: reduce ipc lock contention
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On Tue, Mar 5, 2013 at 11:13 PM, Davidlohr Bueso <davidlohr.bueso@hp.com> wrote:
>
> Digging into the _raw_spin_lock call:
>
> 17.86% oracle [kernel.kallsyms] [k] _raw_spin_lock
> |
> --- _raw_spin_lock
> |
> |--49.55%-- sys_semtimedop
> | |
> | |--77.41%-- system_call
> | | semtimedop
> | | skgpwwait
> | | ksliwat
> | | kslwaitctx

Hmm. It looks like you cut that off a bit too early. This shows that
half the cases came from sys_semtimedop. Where did the other half come
from?

Linus


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