linux-kernel - Re: [PATCH 09/33] mm: system wide ALLOC_NO

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Message-Id: <200710311452.36239.nickpiggin@yahoo.com.au>
Date:	Wed, 31 Oct 2007 14:52:35 +1100
From:	Nick Piggin <nickpiggin@...oo.com.au>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
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, trond.myklebust@....uio.no
Subject: Re: [PATCH 09/33] mm: system wide ALLOC_NO_WATERMARK

On Wednesday 31 October 2007 03:04, Peter Zijlstra wrote:
> Change ALLOC_NO_WATERMARK page allocation such that the reserves are system
> wide - which they are per setup_per_zone_pages_min(), when we scrape the
> barrel, do it properly.
>

IIRC it's actually not too uncommon to have allocations coming here via
page reclaim. It's not exactly clear that you want to break mempolicies
at this point.


> Signed-off-by: Peter Zijlstra <a.p.zijlstra@...llo.nl>
> ---
>  mm/page_alloc.c |    6 ++++++
>  1 file changed, 6 insertions(+)
>
> Index: linux-2.6/mm/page_alloc.c
> ===================================================================
> --- linux-2.6.orig/mm/page_alloc.c
> +++ linux-2.6/mm/page_alloc.c
> @@ -1638,6 +1638,12 @@ restart:
>  rebalance:
>  	if (alloc_flags & ALLOC_NO_WATERMARKS) {
>  nofail_alloc:
> +		/*
> +		 * break out of mempolicy boundaries
> +		 */
> +		zonelist = NODE_DATA(numa_node_id())->node_zonelists +
> +			gfp_zone(gfp_mask);
> +
>  		/* go through the zonelist yet again, ignoring mins */
>  		page = get_page_from_freelist(gfp_mask, order, zonelist,
>  				ALLOC_NO_WATERMARKS);
>
> --
>
> -
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