linux-kernel - Re: [RFC 4/9] Atomic reclaim: Save irq flags in vmscan.c

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Message-ID: <20070814222150.GI23308@one.firstfloor.org>
Date:	Wed, 15 Aug 2007 00:21:50 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Christoph Lameter <clameter@....com>
Cc:	Andi Kleen <andi@...stfloor.org>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [RFC 4/9] Atomic reclaim: Save irq flags in vmscan.c

> Ok I have a vague idea on how this could but its likely that the 
> changes make things worse rather than better. Additional reference to a 
> new cacheline (per cpu but still), preempt disable. Lots of code at all
> call sites. Interrupt enable/disable is quite efficient in recent 
> processors.

The goal of this was not to be faster than interrupt disable,
but to avoid the interrupt latency impact. This might be a problem
when spending a lot of time inside the locks.

-Andi
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