linux-kernel - RE: [net-next rfc 1/3] net: avoid high order memory allocation for queues by using flex array

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Message-ID: <1371659333.3252.329.camel@edumazet-glaptop>
Date:	Wed, 19 Jun 2013 09:28:53 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	David Laight <David.Laight@...LAB.COM>
Cc:	"Michael S. Tsirkin" <mst@...hat.com>,
	Jason Wang <jasowang@...hat.com>, davem@...emloft.net,
	edumazet@...gle.com, hkchu@...gle.com, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: RE: [net-next rfc 1/3] net: avoid high order memory allocation for
 queues by using flex array

On Wed, 2013-06-19 at 17:06 +0100, David Laight wrote:

> Given the number of places I've seen this code added, why
> not put it in a general helper?

Good luck with that. We had many attempts in the past.

> I also thought that malloc() with GFP_KERNEL would sleep.
> Under what conditions does it fail instead?

For example on 32 bit kernel, LOW memory exhaustion/fragmentation.

vmalloc() has an extra 128MB virtual space (on i386 at least with
standard 3G/1G split)



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