linux-kernel - Re: Memory management woes - order 1 allocation failures

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Message-Id: <20100301103546.DD86.A69D9226@jp.fujitsu.com>
Date:	Mon,  1 Mar 2010 10:42:50 +0900 (JST)
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	Pekka Enberg <penberg@...helsinki.fi>,
	Alan Cox <alan@...rguk.ukuu.org.uk>
Cc:	kosaki.motohiro@...fujitsu.com,
	Christoph Lameter <cl@...ux-foundation.org>,
	Frans Pop <elendil@...net.nl>, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, Mel Gorman <mel@...net.ie>
Subject: Re: Memory management woes - order 1 allocation failures

> AFAICT, even in the worst case, the latter call-site is well below 4K.
> I have no idea of the tty one.

afaik, tty_buffer_request_room() try to expand its buffer size for efficiency. but Its failure
doesn't cause any user visible failure. probably we can mark it as NOWARN.

In worst case, maximum tty buffer size is 64K, it can make allocation failure easily.


Alan, Can you please tell us your mention?



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