From: Christoph Lameter <clameter@sgi.com>
To: Rik van Riel <riel@redhat.com>
Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org,
akpm@linux-foundation.org, dkegel@google.com,
Peter Zijlstra <a.p.zijlstra@chello.nl>,
David Miller <davem@davemloft.net>, Nick Piggin <npiggin@suse.de>
Subject: Re: [RFC 0/7] Postphone reclaim laundry to write at high water marks
Date: Tue, 21 Aug 2007 14:30:59 -0700 (PDT) [thread overview]
Message-ID: <Pine.LNX.4.64.0708211429530.3390@schroedinger.engr.sgi.com> (raw)
In-Reply-To: <46CB55A8.4030501@redhat.com>
On Tue, 21 Aug 2007, Rik van Riel wrote:
> > What is preventing that from occurring right now? If the dirty pags are
> > aligned in the right way you can have the exact same situation.
>
> For one, dirty page writeout is done even when free memory
> is low. The kernel will dig into the PF_MEMALLOC reserves,
> instead of deciding not to do writeout unless there is lots
> of free memory.
Right that is a fundamental problem with this RFC. We need to be able to
get into PF_MEMALLOC reserves for writeout.
> Secondly, why would you want to recreate this worst case on
> purpose every time the pageout code runs?
I did not intend that to occur.
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next prev parent reply other threads:[~2007-08-21 21:30 UTC|newest]
Thread overview: 46+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-08-20 21:50 Christoph Lameter
2007-08-20 21:50 ` [RFC 1/7] release_lru_pages(): Generic release of pages to the LRU Christoph Lameter
2007-08-21 14:52 ` Mel Gorman
2007-08-21 20:51 ` Christoph Lameter
2007-08-20 21:50 ` [RFC 2/7] Move checks from pageout() to shrink_page_list Christoph Lameter
2007-08-20 21:50 ` [RFC 3/7] shrink_page_list: Support isolating dirty pages on laundry list Christoph Lameter
2007-08-21 15:04 ` Mel Gorman
2007-08-21 20:53 ` Christoph Lameter
2007-08-20 21:50 ` [RFC 4/7] Pass laundry through shrink_inactive_list() and shrink_zone() Christoph Lameter
2007-08-20 21:50 ` [RFC 5/7] Laundry handling for direct reclaim Christoph Lameter
2007-08-21 15:06 ` Mel Gorman
2007-08-21 20:55 ` Christoph Lameter
2007-08-21 15:19 ` Mel Gorman
2007-08-21 21:00 ` Christoph Lameter
2007-08-20 21:50 ` [RFC 6/7] kswapd: Do laundry after reclaim Christoph Lameter
2007-08-20 21:50 ` [RFC 7/7] Switch of PF_MEMALLOC during writeout Christoph Lameter
2007-08-20 23:08 ` Andi Kleen
2007-08-20 23:19 ` Christoph Lameter
2007-08-21 1:13 ` Andi Kleen
2007-08-21 10:36 ` [RFC 0/7] Postphone reclaim laundry to write at high water marks Peter Zijlstra
2007-08-21 20:48 ` Christoph Lameter
2007-08-21 21:13 ` Peter Zijlstra
2007-08-21 21:29 ` Christoph Lameter
2007-08-21 21:43 ` Rik van Riel
2007-08-21 22:32 ` Christoph Lameter
2007-08-23 12:05 ` Andrea Arcangeli
2007-08-23 20:23 ` Christoph Lameter
2007-08-21 22:09 ` Peter Zijlstra
2007-08-21 22:43 ` Christoph Lameter
2007-08-22 7:02 ` Peter Zijlstra
2007-08-22 19:04 ` Christoph Lameter
2007-08-22 20:03 ` Peter Zijlstra
2007-08-22 20:16 ` Christoph Lameter
2007-08-23 7:39 ` Peter Zijlstra
2007-08-26 4:52 ` Rik van Riel
2007-08-23 12:16 ` Andrea Arcangeli
2007-08-22 7:45 ` Ingo Molnar
2007-08-22 19:19 ` Christoph Lameter
2007-08-23 12:08 ` Andrea Arcangeli
2007-08-23 12:59 ` Peter Zijlstra
2007-08-21 15:16 ` Rik van Riel
2007-08-21 20:59 ` Christoph Lameter
2007-08-21 21:14 ` Rik van Riel
2007-08-21 21:30 ` Christoph Lameter [this message]
2007-08-21 15:51 ` Dave McCracken
2007-08-21 21:03 ` Christoph Lameter
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