linux-kernel - Re: [PATCH 4/5] mm: compaction: Determine if dirty pages can be migreated without blocking within ->migratepage

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Date:	Fri, 25 Nov 2011 22:51:36 -0800
From:	Andy Isaacson <adi@...apodia.org>
To:	Mel Gorman <mgorman@...e.de>
Cc:	Andrea Arcangeli <aarcange@...hat.com>,
	Linux-MM <linux-mm@...ck.org>,
	Minchan Kim <minchan.kim@...il.com>, Jan Kara <jack@...e.cz>,
	Johannes Weiner <jweiner@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 4/5] mm: compaction: Determine if dirty pages can be
	migreated without blocking within ->migratepage

On Thu, Nov 24, 2011 at 12:21:44PM +0000, Mel Gorman wrote:
> On Thu, Nov 24, 2011 at 02:19:43AM +0100, Andrea Arcangeli wrote:
> > Yes also note, ironically this is likely to be a better test for this
> > without the __GFP_MOVABLE in block_dev.c. Even if we want it fixed,
> > maybe another source that reduces the non movable pages may be needed then.
> > 
> 
> I'm also running other tests to avoid tuning for just this test cases.
> Right now, the list looks like;
> 
> 1. postmark with something creating anonymous mappings in the background
> 2. plain USB writing while creating anonymous mappings

I've been testing the original case that started this thread -- writing
multiple GB to a USB attached, FAT, very slow SD card.

I'm currently running 7f80850d + "mm: Do not stall in synchronous
compaction for THP allocations" Mel's original patch.  With this patch I
cannot reproduce the hangs that I saw.  I haven't retried without the
patch to confirm that they're reproducible, though.

someone asked about CONFIG_NUMA; I have CONFIG_NUMA=y.

I can reboot this weekend; what patches should I test with next?

-andy
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