linux-kernel - RE: [PATCHv19 00/15] Contiguous Memory Allocator

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Message-id: <009f01ccdc41$f30a5f70$d91f1e50$%szyprowski@samsung.com>
Date:	Thu, 26 Jan 2012 16:48:29 +0100
From:	Marek Szyprowski <m.szyprowski@...sung.com>
To:	'Arnd Bergmann' <arnd@...db.de>
Cc:	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-media@...r.kernel.org, linux-mm@...ck.org,
	linaro-mm-sig@...ts.linaro.org,
	'Michal Nazarewicz' <mina86@...a86.com>,
	'Kyungmin Park' <kyungmin.park@...sung.com>,
	'Russell King' <linux@....linux.org.uk>,
	'Andrew Morton' <akpm@...ux-foundation.org>,
	'KAMEZAWA Hiroyuki' <kamezawa.hiroyu@...fujitsu.com>,
	'Daniel Walker' <dwalker@...eaurora.org>,
	'Mel Gorman' <mel@....ul.ie>,
	'Jesse Barker' <jesse.barker@...aro.org>,
	'Jonathan Corbet' <corbet@....net>,
	'Shariq Hasnain' <shariq.hasnain@...aro.org>,
	'Chunsang Jeong' <chunsang.jeong@...aro.org>,
	'Dave Hansen' <dave@...ux.vnet.ibm.com>,
	'Benjamin Gaignard' <benjamin.gaignard@...aro.org>
Subject: RE: [PATCHv19 00/15] Contiguous Memory Allocator

Hello,

On Thursday, January 26, 2012 4:32 PM Arnd Bergmann wrote:

> On Thursday 26 January 2012, Marek Szyprowski wrote:
> > Welcome everyone!
> >
> > Yes, that's true. This is yet another release of the Contiguous Memory
> > Allocator patches. This version mainly includes code cleanups requested
> > by Mel Gorman and a few minor bug fixes.
> 
> Hi Marek,
> 
> Thanks for keeping up this work! I really hope it works out for the
> next merge window.
> 
> > TODO (optional):
> > - implement support for contiguous memory areas placed in HIGHMEM zone
> > - resolve issue with movable pages with pending io operations
> 
> Can you clarify these? I believe the contiguous memory areas in highmem
> is something that should really be after the existing code is merged
> into the upstream kernel and should better not be listed as TODO here.

Ok, I will remove it from the TODO list. Core memory management is very 
little dependence on HIGHMEM, it is more about DMA-mapping framework to 
be aware that there might be no lowmem mappings for the allocated pages.
This can be easily added once the initial version got merged.
 
> I haven't followed the last two releases so closely. It seems that
> in v17 the movable pages with pending i/o was still a major problem
> but in v18 you added a solution. Is that right? What is still left
> to be done here then?

Since v18 the failed allocation is retried in a bit different place in 
the contiguous memory area what heavily increased overall reliability.

This can be improved by making cma a bit more aware about pending io 
operations, but I want to leave this after the initial merge.

I think that there are no major issues left to be resolved now.

Best regards
-- 
Marek Szyprowski
Samsung Poland R&D Center


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