From: William Lee Irwin III <wli@holomorphy.com>
To: David Brownell <david-b@pacbell.net>
Cc: "Adam J. Richter" <adam@yggdrasil.com>, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] generic device DMA (dma_pool update)
Date: Thu, 2 Jan 2003 22:52:20 -0800 [thread overview]
Message-ID: <20030103065220.GA9704@holomorphy.com> (raw)
In-Reply-To: <3E1531D3.3070809@pacbell.net>
Adam J. Richter wrote:
>> mempool_alloc does. That's the point of it. You calculate
>> how many objects you need in order to guarantee no deadlocks and
>> reserve that number in advance (the initial reservation can fail).
On Thu, Jan 02, 2003 at 10:46:43PM -0800, David Brownell wrote:
> To rephrase that so it illustrates my point: the whole reason to
> use mempool is to try adding __GFP_NEVERFAIL when __GFP_WAIT is
> given ... because __GFP_WAIT doesn't otherwise mean NEVERFAIL.
Well, it's not quite that general. There is a constraint of the
objects allocated with a mempool having a finite lifetime. And
non-waiting mempool allocations are also available, but may fail.
So long as the queueing is fair everyone eventually gets their turn.
Bill
next prev parent reply other threads:[~2003-01-03 6:44 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-01-02 22:07 [PATCH] generic device DMA (dma_pool update) Adam J. Richter
2003-01-03 0:20 ` Russell King
2003-01-03 4:50 ` David Brownell
2003-01-03 6:11 ` David Brownell
2003-01-03 6:46 ` David Brownell
2003-01-03 6:52 ` William Lee Irwin III [this message]
-- strict thread matches above, loose matches on Subject: below --
2003-01-02 17:04 Adam J. Richter
2003-01-02 4:13 Adam J. Richter
2003-01-02 16:41 ` James Bottomley
2003-01-02 18:26 ` David Brownell
2003-01-01 19:21 Adam J. Richter
2003-01-01 19:48 ` James Bottomley
2003-01-02 2:11 ` David Brownell
2003-01-01 0:02 Adam J. Richter
2002-12-31 23:38 Adam J. Richter
2002-12-31 22:02 Adam J. Richter
2002-12-31 22:41 ` Andrew Morton
2002-12-31 23:23 ` David Brownell
2002-12-31 23:27 ` Andrew Morton
2002-12-31 23:44 ` David Brownell
2002-12-31 23:47 ` James Bottomley
2003-01-01 17:10 ` James Bottomley
2002-12-31 23:35 ` David Brownell
2002-12-27 21:40 [RFT][PATCH] generic device DMA implementation James Bottomley
2002-12-28 1:56 ` David Brownell
2002-12-30 23:11 ` [PATCH] generic device DMA (dma_pool update) David Brownell
2002-12-31 15:00 ` James Bottomley
2002-12-31 17:04 ` David Brownell
2002-12-31 17:23 ` James Bottomley
2002-12-31 18:11 ` David Brownell
2002-12-31 18:44 ` James Bottomley
2002-12-31 19:29 ` David Brownell
2002-12-31 19:50 ` James Bottomley
2002-12-31 21:17 ` David Brownell
2002-12-31 16:36 ` James Bottomley
2002-12-31 17:32 ` David Brownell
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