linux-kernel - Re: ppoll() stuck on POLLIN while TCP peer is sending

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Date:	Fri, 11 Jan 2013 00:51:05 +0000
From:	Eric Wong <normalperson@...t.net>
To:	Mel Gorman <mgorman@...e.de>
Cc:	linux-mm@...ck.org, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, Rik van Riel <riel@...hat.com>,
	Minchan Kim <minchan@...nel.org>,
	Eric Dumazet <eric.dumazet@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: ppoll() stuck on POLLIN while TCP peer is sending

Mel Gorman <mgorman@...e.de> wrote:
> mm: compaction: Partially revert capture of suitable high-order page

<snip>
 
> Reported-by: Eric Wong <normalperson@...t.net>
> Cc: stable@...r.kernel.org
> Signed-off-by: Mel Gorman <mgorman@...e.de>

Thanks, my original use case and test works great after several hours!

Tested-by: Eric Wong <normalperson@...t.net>


Unfortunately, I also hit a new bug in 3.8 (not in 3.7.x).  based on Eric
Dumazet's observations, sk_stream_wait_memory may be to blame.
Fortunately this is easier to reproduce (I've cc-ed participants
on this thread already): <20130111004915.GA15415@...r.yhbt.net>
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