linux-kernel - Re: [patch 21/21] slab defrag: Obsolete SLAB

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Message-ID: <Pine.LNX.4.64.0805141220440.16223@schroedinger.engr.sgi.com>
Date:	Wed, 14 May 2008 12:21:27 -0700 (PDT)
From:	Christoph Lameter <clameter@....com>
To:	Matt Mackall <mpm@...enic.com>
cc:	Andi Kleen <andi@...stfloor.org>,
	Pekka Enberg <penberg@...helsinki.fi>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Rik van Riel <riel@...hat.com>, akpm@...ux-foundation.org,
	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	Mel Gorman <mel@...net.ie>, Matthew Wilcox <matthew@....cx>,
	"Zhang, Yanmin" <yanmin_zhang@...ux.intel.com>
Subject: Re: [patch 21/21] slab defrag: Obsolete SLAB

On Wed, 14 May 2008, Matt Mackall wrote:

> > Interrupt exit in general would have to inspect the per cpu structures of 
> > all slab caches on the system?
> 
> Why's that? When we're not under pressure (fast path), we can delay (and
> batch) remote frees. When we are under pressure (slow path), we can do
> everything immediately.

Fastpath is what? I guess slow path means we called into the page 
allocator?

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