linux-kernel - Re: [PATCH] gfp: GFP_RECLAIM_MASK should include __GFP_NO

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Message-ID: <20151014083827.GG28333@dhcp22.suse.cz>
Date:	Wed, 14 Oct 2015 10:38:27 +0200
From:	Michal Hocko <mhocko@...nel.org>
To:	Pan Xinhui <xinhuix.pan@...el.com>
Cc:	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	Andrew Morton <akpm@...ux-foundation.org>, vbabka@...e.cz,
	rientjes@...gle.com, hannes@...xchg.org, nasa4836@...il.com,
	mgorman@...e.de, alexander.h.duyck@...hat.com,
	aneesh.kumar@...ux.vnet.ibm.com,
	"yanmin_zhang@...ux.intel.com" <yanmin_zhang@...ux.intel.com>
Subject: Re: [PATCH] gfp: GFP_RECLAIM_MASK should include __GFP_NO_KSWAPD

On Wed 14-10-15 16:17:31, Pan Xinhui wrote:
[...]
> I have a look at Mel's patchset. yes, it can help fix my kswapd issue.
> :) So I just need change my kmalloc's gfp_flag to GFP_ATOMIC &~
> __GFP_KSWAPD_RECLAIM, then slub will not wakeup kswpad.

As pointed out in my other email __GFP_ATOMIC would be more appropriate
because you shouldn't abuse memory reserves which are implicitly used
for GFP_ATOMIC requests.

-- 
Michal Hocko
SUSE Labs
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