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Subject: Re: [PATCH v2 0/4] ipc: reduce ipc lock contention
From: Linus Torvalds <torvalds@linux-foundation.org>
To: Davidlohr Bueso <davidlohr.bueso@hp.com>
Cc: Rik van Riel <riel@redhat.com>, Emmanuel Benisty <benisty.e@gmail.com>,
        "Vinod, Chegu" <chegu_vinod@hp.com>, "Low, Jason" <jason.low2@hp.com>,
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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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