From: Eric Dumazet <eric.dumazet@gmail.com>
To: Sasha Levin <sasha.levin@oracle.com>
Cc: Christoph Lameter <cl@gentwo.org>,
Pekka Enberg <penberg@kernel.org>,
"linux-mm@kvack.org" <linux-mm@kvack.org>,
Andrew Morton <akpm@linux-foundation.org>,
LKML <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH] slab: prevent warnings when allocating with __GFP_NOWARN
Date: Tue, 11 Jun 2013 09:37:35 -0700 [thread overview]
Message-ID: <1370968655.3252.49.camel@edumazet-glaptop> (raw)
In-Reply-To: <51B74E28.4070906@oracle.com>
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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next prev parent reply other threads:[~2013-06-11 16:37 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-06-10 19:18 Sasha Levin
2013-06-10 19:31 ` Pekka Enberg
2013-06-10 19:56 ` Sasha Levin
2013-06-10 23:40 ` Christoph Lameter
2013-06-11 0:54 ` Sasha Levin
2013-06-11 6:28 ` Pekka Enberg
2013-06-11 13:16 ` Sasha Levin
2013-06-11 15:14 ` Christoph Lameter
2013-06-11 15:16 ` Pekka Enberg
2013-06-11 15:23 ` Christoph Lameter
2013-06-11 15:44 ` Sasha Levin
2013-06-11 16:13 ` Eric Dumazet
2013-06-11 16:19 ` Sasha Levin
2013-06-11 16:37 ` Eric Dumazet [this message]
2013-06-11 16:43 ` Dave Jones
2013-06-11 19:02 ` Sasha Levin
2013-06-12 13:01 ` Christoph Lameter
2013-06-11 16:28 ` Christoph Lameter
2013-06-11 22:34 ` Andrew Morton
2013-06-13 7:03 ` Pekka Enberg
2013-06-11 22:10 ` David Rientjes
2013-06-11 15:08 ` Christoph Lameter
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