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

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Date:	Wed, 12 Jun 2013 13:01:42 +0000
From:	Christoph Lameter <cl@...two.org>
To:	Eric Dumazet <eric.dumazet@...il.com>
cc:	Sasha Levin <sasha.levin@...cle.com>,
	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, 11 Jun 2013, Eric Dumazet wrote:

> Yes and no : adding a test to select vmalloc()/vfree() instead of
> kmalloc()/kfree() will slow down regular users asking 32 pages in their
> pipe.

But vmalloc would allow buffers larger than MAX_PAGE_ORDER. The allocation
would not fail. You could have 1G or so pipes if necessary.

> If there is no _sensible_ use for large pipes even for root, please do
> not bloat the code just because we can.

Some code bloat to enable super sized pipes may be ok?

Huge page support could be useful to increase speed?


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