linux-kernel - Re: [RFC PATCH 0/3] Avoid the use of congestion

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Message-ID: <20100324114930.GG21147@csn.ul.ie>
Date:	Wed, 24 Mar 2010 11:49:31 +0000
From:	Mel Gorman <mel@....ul.ie>
To:	Greg KH <gregkh@...e.de>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Christian Ehrhardt <ehrhardt@...ux.vnet.ibm.com>,
	linux-mm@...ck.org, Nick Piggin <npiggin@...e.de>,
	Chris Mason <chris.mason@...cle.com>,
	Jens Axboe <jens.axboe@...cle.com>,
	linux-kernel@...r.kernel.org, Corrado Zoccolo <czoccolo@...il.com>,
	Rik van Riel <riel@...hat.com>,
	Johannes Weiner <hannes@...xchg.org>
Subject: Re: [RFC PATCH 0/3] Avoid the use of congestion_wait under zone
	pressure

On Tue, Mar 23, 2010 at 07:38:37PM -0700, Greg KH wrote:
> On Mon, Mar 22, 2010 at 11:50:54PM +0000, Mel Gorman wrote:
> > 2. TTY using high order allocations more frequently
> > 	fix title: ttyfix
> > 	fixed in mainline? yes, in 2.6.34-rc2
> > 	affects: 2.6.31 to 2.6.34-rc1
> > 
> > 	2.6.31 made pty's use the same buffering logic as tty.	Unfortunately,
> > 	it was also allowed to make high-order GFP_ATOMIC allocations. This
> > 	triggers some high-order reclaim and introduces some stalls. It's
> > 	fixed in 2.6.34-rc2 but needs back-porting.
> 
> It will go to the other stable kernels for their next round of releases
> now that it is in Linus's tree.
> 

Great.

> > Next Steps
> > ==========
> > 
> > Jens, any problems with me backporting the async/sync fixes from 2.6.31 to
> > 2.6.30.x (assuming that is still maintained, Greg?)?
> 
> No, .30 is no longer being maintained.
> 

Right, I won't lose any sleep over 2.6.30.dodo so :)

Thanks

-- 
Mel Gorman
Part-time Phd Student                          Linux Technology Center
University of Limerick                         IBM Dublin Software Lab
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