linux-kernel - Re: [PATCH] slab: prevent warnings when allocating with __GFP

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Message-ID: <1370967193.3252.47.camel@edumazet-glaptop>
Date:	Tue, 11 Jun 2013 09:13:13 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Sasha Levin <sasha.levin@...cle.com>
Cc:	Christoph Lameter <cl@...two.org>,
	Pekka Enberg <penberg@...nel.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] slab: prevent warnings when allocating with __GFP_NOWARN

On Tue, 2013-06-11 at 11:44 -0400, Sasha Levin wrote:
> On 06/11/2013 11:23 AM, Christoph Lameter wrote:
> > On Tue, 11 Jun 2013, Pekka Enberg wrote:
> >
> >> So you're OK with going forward with Sasha's patch? It's needed
> >> because __GFP_NOWARN was specifically added there to fix this
> >> issue earlier.
> >
> > Why dont we fix the call site to use vmalloc instead for larger allocs?
> >
> 
> We should probably be doing both.

Allowing a pipe to store thousands of page refs seems quite useless and
dangerous.

Having to use vmalloc()/vfree() for every splice()/vmsplice() would be a
performance loss anyway.

(fs/splice.c splice_grow_spd() will also want to allocate big kmalloc()
chunks)




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