linux-kernel - Re: [PATCH] virtio: Do not drop __GFP_HIGH in alloc

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Date:	Mon, 7 Dec 2015 11:29:09 +0000
From:	Mel Gorman <mgorman@...hsingularity.net>
To:	Michal Hocko <mhocko@...nel.org>
Cc:	"Michael S. Tsirkin" <mst@...hat.com>,
	Will Deacon <will.deacon@....com>,
	"Huang, Ying" <ying.huang@...ux.intel.com>,
	virtualization@...ts.linux-foundation.org,
	LKML <linux-kernel@...r.kernel.org>,
	Michal Hocko <mhocko@...e.com>
Subject: Re: [PATCH] virtio: Do not drop __GFP_HIGH in alloc_indirect

On Tue, Dec 01, 2015 at 03:32:49PM +0100, Michal Hocko wrote:
> From: Michal Hocko <mhocko@...e.com>
> 
> b92b1b89a33c ("virtio: force vring descriptors to be allocated from
> lowmem") tried to exclude highmem pages for descriptors so it cleared
> __GFP_HIGHMEM from a given gfp mask. The patch also cleared __GFP_HIGH
> which doesn't make much sense for this fix because __GFP_HIGH only
> controls access to memory reserves and it doesn't have any influence
> on the zone selection. Some of the call paths use GFP_ATOMIC and
> dropping __GFP_HIGH will reduce their changes for success because the
> lack of access to memory reserves.
> 
> Signed-off-by: Michal Hocko <mhocko@...e.com>

Reviewed-by: Mel Gorman <mgorman@...hsingularity.net>

It also has been tested by Ying Huang and found to have fixed a page
allocation failure problem in 4.4-rc3 in the Intel 0-day testing
infrastructure.

-- 
Mel Gorman
SUSE Labs
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