linux-kernel - Re: [PATCH 10/19] NET: set PF_FSTRANS while holding sk

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Date:	Thu, 17 Apr 2014 12:38:37 +1000
From:	NeilBrown <neilb@...e.de>
To:	David Miller <davem@...emloft.net>
Cc:	eric.dumazet@...il.com, linux-mm@...ck.org,
	linux-nfs@...r.kernel.org, linux-kernel@...r.kernel.org,
	xfs@....sgi.com, netdev@...r.kernel.org
Subject: Re: [PATCH 10/19] NET: set PF_FSTRANS while holding sk_lock

On Wed, 16 Apr 2014 09:00:02 -0400 (EDT) David Miller <davem@...emloft.net>
wrote:

> From: Eric Dumazet <eric.dumazet@...il.com>
> Date: Tue, 15 Apr 2014 22:13:46 -0700
> 
> > For applications handling millions of sockets, this makes a difference.
> 
> Indeed, this really is not acceptable.

As you say...
I've just discovered that I can get rid of the lockdep message (and hence
presumably the deadlock risk) with a well placed:

		newsock->sk->sk_allocation = GFP_NOFS;

which surprised me as it seemed to be an explicit GFP_KERNEL allocation that
was mentioned in the lockdep trace.  Obviously these traces require quite
some sophistication to understand.

So - thanks for the feedback, patch can be ignored.

Thanks,
NeilBrown

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