Re: [PATCH] slab: prevent warnings when allocating with __GFP_NOWARN

From: Eric Dumazet
Date: Tue Jun 11 2013 - 12:13:22 EST

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

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()

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