linux-kernel - Re: [PATCH 04/31] mm: tag reseve pages

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Message-ID: <alpine.DEB.1.00.0910011407390.32006@chino.kir.corp.google.com>
Date:	Thu, 1 Oct 2009 14:09:54 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	Suresh Jayaraman <sjayaraman@...e.de>
cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	netdev@...r.kernel.org, Neil Brown <neilb@...e.de>,
	Miklos Szeredi <mszeredi@...e.cz>, Wouter Verhelst <w@...r.be>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	trond.myklebust@....uio.no
Subject: Re: [PATCH 04/31] mm: tag reseve pages

On Thu, 1 Oct 2009, Suresh Jayaraman wrote:

> Index: mmotm/mm/page_alloc.c
> ===================================================================
> --- mmotm.orig/mm/page_alloc.c
> +++ mmotm/mm/page_alloc.c
> @@ -1501,8 +1501,10 @@ zonelist_scan:
>  try_this_zone:
>  		page = buffered_rmqueue(preferred_zone, zone, order,
>  						gfp_mask, migratetype);
> -		if (page)
> +		if (page) {
> +			page->reserve = !!(alloc_flags & ALLOC_NO_WATERMARKS);
>  			break;
> +		}
>  this_zone_full:
>  		if (NUMA_BUILD)
>  			zlc_mark_zone_full(zonelist, z);

page->reserve won't necessary indicate that access to reserves was 
_necessary_ for the allocation to succeed, though.  This will mark any 
page being allocated under PF_MEMALLOC as reserve when all zones may be 
well above their min watermarks.

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