From mboxrd@z Thu Jan  1 00:00:00 1970
From: Linus Torvalds <torvalds@linux-foundation.org>
Subject: Re: [PATCH v7 1/4] spinlock: A new lockref structure for lockless
 update of refcount
Date: Sun, 1 Sep 2013 08:55:56 -0700
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To: Sedat Dilek <sedat.dilek@gmail.com>
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On Sun, Sep 1, 2013 at 8:45 AM, Sedat Dilek <sedat.dilek@gmail.com> wrote:
>
> Samples: 160K of event 'cycles:pp', Event count (approx.): 77003901089
> +  12,46%  t_lockref_from-  [kernel.kallsyms]     [k] irq_return
> +   4,86%  t_lockref_from-  [kernel.kallsyms]     [k] lockref_get_or_lock
> +   4,42%  t_lockref_from-  [kernel.kallsyms]     [k] __ticket_spin_lock
> +   4,28%  t_lockref_from-  [kernel.kallsyms]     [k] __acct_update_integrals

You need to go into __ticket_spin_lock to see who the callers are.

Just go down to it and press enter to expand it (and then you need to
go and expand that entry too to get the callers)

I still don't know how you get to irq_return. It should use sysret. Odd.

            Linus