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

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Message-ID: <1370968655.3252.49.camel@edumazet-glaptop>
Date:	Tue, 11 Jun 2013 09:37:35 -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 12:19 -0400, Sasha Levin wrote:

> It might be, but you need CAP_SYS_RESOURCE to go into the dangerous
> zone (>pipe_max_size).
> 
> So if root (or someone with that cap) wants to go there, as Rusty says:
> "Root asked, we do."

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.

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



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