linux-kernel - Re: quicklists confuse meminfo

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Message-ID: <e2e108260803210552i4cdef6a5qf8f5076eaac2cf03@mail.gmail.com>
Date:	Fri, 21 Mar 2008 13:52:59 +0100
From:	"Bart Van Assche" <bart.vanassche@...il.com>
To:	"Nick Piggin" <nickpiggin@...oo.com.au>
Cc:	"Christoph Lameter" <clameter@....com>,
	"Andrew Morton" <akpm@...ux-foundation.org>,
	"Ingo Molnar" <mingo@...e.hu>,
	"KOSAKI Motohiro" <kosaki.motohiro@...fujitsu.com>,
	"Thomas Gleixner" <tglx@...utronix.de>,
	LKML <linux-kernel@...r.kernel.org>,
	"Linus Torvalds" <torvalds@...ux-foundation.org>
Subject: Re: quicklists confuse meminfo

On Tue, Mar 11, 2008 at 5:07 AM, Nick Piggin <nickpiggin@...oo.com.au> wrote:
>  [ ... ]
>
>  This is insane. We add more and more of this NUMA and cpuset and anti-frag
>  and page zeroing logic to the page allocator, and then decide that we
>  don't actually need to obey any of those rules when we're running lat_proc.
>
>  You will never be able to make the page allocator faster than a single list
>  of pages. The reason is because we actually *want* some of these checks and
>  heuristics in the page allocator.
>
>  And I doubt a list of zeroed pages is the right approach. That's just
>  adding more complexity for lat_proc AFAIKS.

Is anyone currently working on this
(http://bugzilla.kernel.org/show_bug.cgi?id=9991) ? I think this
should either be fixed or documented as a known issue.

Bart.
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