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Date: Wed, 9 Mar 2005 03:05:12 -0800
From: Andrew Morton <akpm@osdl.org>
To: suparna@in.ibm.com
Cc: dhowells@redhat.com, pbadari@us.ibm.com, linux-aio@kvack.org,
       linux-kernel@vger.kernel.org
Subject: Re: aio stress panic on 2.6.11-mm1
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Suparna Bhattacharya <suparna@in.ibm.com> wrote:
>
> Any sense of how costly it is to use spin_lock_irq's vs spin_lock
>  (across different architectures) ? Isn't rwsem used very widely ?

It's only on the slow path, and we've already done a bunch of atomic ops
and a schedule()/wakeup() anyway.