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

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Message-ID: <alpine.DEB.2.10.1503021239410.20808@chino.kir.corp.google.com>
Date:	Mon, 2 Mar 2015 12:40:24 -0800 (PST)
From:	David Rientjes <rientjes@...gle.com>
To:	Vlastimil Babka <vbabka@...e.cz>
cc:	Christoph Lameter <cl@...ux.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	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 Mon, 2 Mar 2015, Vlastimil Babka wrote:

> > > > You are thinking about an opportunistic allocation attempt in SLAB?
> > > > 
> > > > AFAICT SLAB allocations should trigger reclaim.
> > > > 
> > > 
> > > Well, let me quote your commit 952f3b51beb5:
> > 
> > This was about global reclaim. Local reclaim is good and that can be
> > done via zone_reclaim.
> 
> Right, so the patch is a functional change for zone_reclaim_mode == 1, where
> !__GFP_WAIT will prevent it.
> 

My patch is not a functional change, get_page_from_freelist() handles 
zone_reclaim_mode == 1 properly in the page allocator fastpath.  This 
patch only touches the slowpath.
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