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From: Alan Stern <stern@rowland.harvard.edu>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp>,
	<linux-usb-devel@lists.sourceforge.net>,
	Pete Zaitcev <zaitcev@redhat.com>, Greg KH <gregkh@suse.de>,
	Kumar Gala <galak@kernel.crashing.org>,
	Linux Kernel list <linux-kernel@vger.kernel.org>
Subject: Re: [linux-usb-devel] 2.6.20 kernel hang with USB drive and vfat doing ftruncate
Date: Wed, 21 Feb 2007 16:22:17 -0500 (EST)	[thread overview]
Message-ID: <Pine.LNX.4.44L0.0702211621310.3435-100000@iolanthe.rowland.org> (raw)
In-Reply-To: <20070221125736.e5ff4206.akpm@linux-foundation.org>

On Wed, 21 Feb 2007, Andrew Morton wrote:

> > > It seems like usb-storage and aio are completely off in the weeds.   
> > > Ideas?
> > 
> > It seems usb-storage should remove some kmalloc and use mempool() for
> > urb...  Is someone working on this? And idea?
> 
> I think Pete said that we're supposed to be using GFP_NOIO in there.

We _are_ using it.

> Not that it'll help much: the VM calls throttle_vm_writeout() for GFP_NOIO
> and GFP_NOFS allocations, which is a bug.  Because if the caller holds
> locks which prevent filesystem or IO progress, we deadlock.
> 
> I'll fix the VM if someone else fixes USB ;)

What else needs to be fixed?

Alan Stern


  reply	other threads:[~2007-02-21 21:22 UTC|newest]

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-02-16 19:54 Kumar Gala
2007-02-18 16:10 ` OGAWA Hirofumi
2007-02-19 21:58   ` Kumar Gala
2007-02-19 22:19     ` OGAWA Hirofumi
2007-02-19 22:27       ` Kumar Gala
2007-02-20 17:20         ` OGAWA Hirofumi
2007-02-19 22:06   ` Kumar Gala
2007-02-21 20:18     ` OGAWA Hirofumi
2007-02-21 20:57       ` Andrew Morton
2007-02-21 21:22         ` Alan Stern [this message]
2007-02-21 21:31           ` [linux-usb-devel] " Andrew Morton
2007-02-21 21:50             ` Alan Stern
2007-02-21 22:54               ` Andrew Morton
2007-02-22  7:40             ` Kumar Gala
2007-02-22 18:20               ` Kumar Gala
2007-02-22 21:57                 ` Andrew Morton

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