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Message-Id: <1193827359.27652.129.camel@twins>
Date: Wed, 31 Oct 2007 11:42:39 +0100
From: Peter Zijlstra <a.p.zijlstra@...llo.nl>
To: Nick Piggin <nickpiggin@...oo.com.au>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>,
Andrew Morton <akpm@...ux-foundation.org>,
linux-kernel@...r.kernel.org, linux-mm@...ck.org,
netdev@...r.kernel.org, trond.myklebust@....uio.no
Subject: Re: [PATCH 06/33] mm: allow PF_MEMALLOC from softirq context
On Wed, 2007-10-31 at 14:51 +1100, Nick Piggin wrote:
> On Wednesday 31 October 2007 03:04, Peter Zijlstra wrote:
> > Allow PF_MEMALLOC to be set in softirq context. When running softirqs from
> > a borrowed context save current->flags, ksoftirqd will have its own
> > task_struct.
>
>
> What's this for? Why would ksoftirqd pick up PF_MEMALLOC? (I guess
> that some networking thing must be picking it up in a subsequent patch,
> but I'm too lazy to look!)... Again, can you have more of a rationale in
> your patch headers, or ref the patch that uses it... thanks
Right, I knew I was forgetting something in these changelogs.
The network stack does quite a bit of packet processing from softirq
context. Once you start swapping over network, some of the packets want
to be processed under PF_MEMALLOC.
See patch 23/33.
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