Re: [PATCH v7 1/4] spinlock: A new lockref structure for locklessupdate of refcount

[Linus Torvalds]

On Sun, Sep 1, 2013 at 8:45 AM, Sedat Dilek <sedat.dilek@xxxxxxxxx> 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
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/