From: Peter Zijlstra <a.p.zijlstra@chello.nl>
To: Christoph Lameter <clameter@sgi.com>
Cc: Pavel Machek <pavel@ucw.cz>,
linux-mm@kvack.org, linux-kernel@vger.kernel.org,
akpm@linux-foundation.org, dkegel@google.com,
David Miller <davem@davemloft.net>, Nick Piggin <npiggin@suse.de>
Subject: Re: [RFC 2/9] Use NOMEMALLOC reclaim to allow reclaim if PF_MEMALLOC is set
Date: Tue, 21 Aug 2007 16:07:11 +0200 [thread overview]
Message-ID: <1187705231.6114.245.camel@twins> (raw)
In-Reply-To: <Pine.LNX.4.64.0708201415260.31167@schroedinger.engr.sgi.com>
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On Mon, 2007-08-20 at 14:17 -0700, Christoph Lameter wrote:
> On Mon, 20 Aug 2007, Peter Zijlstra wrote:
>
> > > Its not that different.
> >
> > Yes it is, disk based completion does not require memory, network based
> > completion requires unbounded memory.
>
> Disk based completion only require no memory if its not on a stack of
> other devices and if the interrupt handles is appropriately shaped. If
> there are multile levels below or there is some sort of complex
> completion handling then this also may require memory.
I'm not aware of such a scenario - but it could well be. Still if it
would it would take a _bounded_ amount of memory per page.
Network would still differ in that it requires an _unbounded_ amount of
packets to receive and process in order to receive that completion.
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next prev parent reply other threads:[~2007-08-21 14:07 UTC|newest]
Thread overview: 46+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-08-14 15:30 [RFC 0/9] Reclaim during GFP_ATOMIC allocs Christoph Lameter
2007-08-14 15:30 ` [RFC 1/9] Allow reclaim via __GFP_NOMEMALLOC reclaim Christoph Lameter
2007-08-14 15:30 ` [RFC 2/9] Use NOMEMALLOC reclaim to allow reclaim if PF_MEMALLOC is set Christoph Lameter
2007-08-18 7:10 ` Pavel Machek
2007-08-20 19:00 ` Christoph Lameter
2007-08-20 20:17 ` Peter Zijlstra
2007-08-20 20:27 ` Christoph Lameter
2007-08-20 21:14 ` Peter Zijlstra
2007-08-20 21:17 ` Christoph Lameter
2007-08-21 14:07 ` Peter Zijlstra [this message]
2007-08-21 0:39 ` Nick Piggin
2007-08-21 14:07 ` Peter Zijlstra
2007-08-23 3:38 ` Nick Piggin
2007-08-23 9:26 ` Peter Zijlstra
2007-08-23 10:11 ` Nikita Danilov
2007-08-23 13:58 ` Peter Zijlstra
2007-08-24 4:00 ` Nick Piggin
2007-08-14 15:30 ` [RFC 3/9] Make cond_rescheds conditional on __GFP_WAIT Christoph Lameter
2007-08-14 15:30 ` [RFC 4/9] Atomic reclaim: Save irq flags in vmscan.c Christoph Lameter
2007-08-14 20:02 ` Andi Kleen
2007-08-14 19:12 ` Christoph Lameter
2007-08-14 20:05 ` Peter Zijlstra
2007-08-14 20:34 ` Andi Kleen
2007-08-14 20:33 ` Andi Kleen
2007-08-14 20:42 ` Christoph Lameter
2007-08-14 20:44 ` Andi Kleen
2007-08-14 21:15 ` Christoph Lameter
2007-08-14 21:23 ` Andi Kleen
2007-08-14 21:26 ` Christoph Lameter
2007-08-14 21:29 ` Andi Kleen
2007-08-14 21:37 ` Christoph Lameter
2007-08-14 21:44 ` Andi Kleen
2007-08-14 21:48 ` Christoph Lameter
2007-08-14 21:56 ` Andi Kleen
2007-08-14 22:07 ` Christoph Lameter
2007-08-14 22:16 ` Andi Kleen
2007-08-14 22:20 ` Christoph Lameter
2007-08-14 22:21 ` Andi Kleen
2007-08-14 22:41 ` Christoph Lameter
2007-08-14 15:30 ` [RFC 5/9] Save irqflags on taking the mapping lock Christoph Lameter
2007-08-14 15:30 ` [RFC 6/9] Disable irqs on taking the private_lock Christoph Lameter
2007-08-14 15:30 ` [RFC 7/9] Save flags in swap.c Christoph Lameter
2007-08-14 15:30 ` [RFC 8/9] Reclaim on an atomic allocation if necessary Christoph Lameter
2007-08-14 15:30 ` [RFC 9/9] Testing: Perform GFP_ATOMIC overallocation Christoph Lameter
2007-08-16 2:49 ` [RFC 0/9] Reclaim during GFP_ATOMIC allocs Nick Piggin
2007-08-16 20:24 ` Christoph Lameter
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