linux-kernel - Re: [patch v2 1/3] mm: remove GFP

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Message-ID: <alpine.DEB.2.11.1502271649060.20876@gentwo.org>
Date:	Fri, 27 Feb 2015 16:53:16 -0600 (CST)
From:	Christoph Lameter <cl@...ux.com>
To:	David Rientjes <rientjes@...gle.com>
cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Vlastimil Babka <vbabka@...e.cz>,
	Pekka Enberg <penberg@...nel.org>,
	Joonsoo Kim <iamjoonsoo.kim@....com>,
	Johannes Weiner <hannes@...xchg.org>,
	Mel Gorman <mgorman@...e.de>,
	Pravin Shelar <pshelar@...ira.com>,
	Jarno Rajahalme <jrajahalme@...ira.com>,
	Li Zefan <lizefan@...wei.com>,
	Greg Thelen <gthelen@...gle.com>, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, netdev@...r.kernel.org,
	cgroups@...r.kernel.org, dev@...nvswitch.org
Subject: Re: [patch v2 1/3] mm: remove GFP_THISNODE

On Fri, 27 Feb 2015, David Rientjes wrote:

> +/*
> + * Construct gfp mask to allocate from a specific node but do not invoke reclaim
> + * or warn about failures.
> + */

We should be triggering reclaim from slab allocations. Why would we not do
this?

Otherwise we will be going uselessly off node for slab allocations.

> +static inline gfp_t gfp_exact_node(gfp_t flags)
> +{
> +	return (flags | __GFP_THISNODE | __GFP_NOWARN) & ~__GFP_WAIT;
> +}
>  #endif

Reclaim needs to be triggered. In particular zone reclaim was made to be
triggered from slab allocations to create more room if needed.

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