linux-kernel - Re: [PATCH -mm 11/14] bootmem: respect goal more likely

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Date:	Fri, 30 May 2008 22:16:56 +0200
From:	Johannes Weiner <hannes@...urebad.de>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Ingo Molnar <mingo@...e.hu>, Yinghai Lu <yhlu.kernel@...il.com>,
	Andi Kleen <andi@...stfloor.org>, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org
Subject: Re: [PATCH -mm 11/14] bootmem: respect goal more likely

Hi,

Johannes Weiner <hannes@...urebad.de> writes:

> The old node-agnostic code tried allocating on all nodes starting from
> the one with the lowest range.  alloc_bootmem_core retried without the
> goal if it could not satisfy it and so the goal was only respected at
> all when it happened to be on the first (lowest page numbers) node (or
> theoretically if allocations failed on all nodes before to the one
> holding the goal).
>
> Introduce a non-panicking helper that starts allocating from the node
> holding the goal and falls back only after all thes tries failed.
>
> Make all other allocation helpers benefit from this new helper.
>
> Signed-off-by: Johannes Weiner <hannes@...urebad.de>
> CC: Ingo Molnar <mingo@...e.hu>
> CC: Yinghai Lu <yhlu.kernel@...il.com>
> CC: Andi Kleen <andi@...stfloor.org>
> ---
>
>  mm/bootmem.c |   77 +++++++++++++++++++++++++++++++----------------------------
>  1 file changed, 41 insertions(+), 36 deletions(-)
>
> --- a/mm/bootmem.c
> +++ b/mm/bootmem.c
> @@ -487,11 +487,33 @@ find_block:
>  		memset(region, 0, size);
>  		return region;
>  	}
> +	return NULL;
> +}

Sorry, forgot to update ->last_success handling here.  Update coming soon.

	Hannes
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