netdev - Re: [PATCH 06/33] mm: allow PF_MEMALLOC from softirq context

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Message-Id: <200710312149.25296.nickpiggin@yahoo.com.au>
Date:	Wed, 31 Oct 2007 21:49:24 +1100
From:	Nick Piggin <nickpiggin@...oo.com.au>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
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 Wednesday 31 October 2007 21:42, Peter Zijlstra wrote:
> 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.

Hmm... what about processing from interrupt context?
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