Re: [PATCH] vfs: Avoid IPI storm due to bh LRU invalidation

[Gilad Ben-Yossef]

On Tue, Feb 7, 2012 at 8:29 PM, Jan Kara <jack@xxxxxxx> wrote:
> On Tue 07-02-12 18:25:18, Gilad Ben-Yossef wrote:
>> On Tue, Feb 7, 2012 at 12:25 AM, Jan Kara <jack@xxxxxxx> wrote:
...
>> I think its worth a shot since the mutex just delays the IPIs instead
>> of canceling them
>> altogether.
>  Well, mutex will just delay callers but the sequence logic behind the
> mutex will reduce number of IPIs a lot - all waiters for mutex will be
> satisfied by a single signalling of all CPUs while previously they would
> each do the signalling.

Oh, you are right. I've missed that part completely. Note to self: never try to
read LKML email on your smartphone...

Gilad


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Gilad Ben-Yossef
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