linux-kernel - Re: quicklists confuse meminfo

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Message-Id: <20080309114640.85c9c3eb.akpm@linux-foundation.org>
Date:	Sun, 9 Mar 2008 11:46:40 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	LKML <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Christoph Lameter <clameter@....com>,
	Bart Van Assche <bart.vanassche@...il.com>
Subject: Re: quicklists confuse meminfo

On Sun, 9 Mar 2008 13:34:32 +0100 Ingo Molnar <mingo@...e.hu> wrote:

> the right solution is to get rid of quicklists altogether

Yes, I think so.

- They are pretty marginal from a performance POV (iirc)

- They've been a relatively rich source of bugs

- As I said when we merged them (under protest): Private object caches
  like this are just a bad idea - caches should be *shared*, because some
  other code path which wants a zeroed page wants a cache-warm one, not a
  cache-cold one from the allocator (iirc there was doubt over how
  cache-warm these pages are, however).

  Making __GFP_ZERO smarter/more efficient would be a preferable way of
  addressing any performance problems we have in there.
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