From: Pavel Machek <pavel@ucw.cz>
To: Alan Stern <stern@rowland.harvard.edu>
Cc: Oliver Neukum <oliver@neukum.org>,
Matthew Dharm <mdharm-kernel@one-eyed-alien.net>,
David Brownell <david-b@pacbell.net>,
Alan Cox <alan@lxorguk.ukuu.org.uk>,
Marcelo Tosatti <marcelo.tosatti@cyclades.com.br>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
USB Developers <linux-usb-devel@lists.sourceforge.net>,
Greg KH <greg@kroah.com>
Subject: Re: [linux-usb-devel] Re: USB hangs
Date: Fri, 16 Jan 2004 14:14:46 +0100 [thread overview]
Message-ID: <20040116131446.GA874@elf.ucw.cz> (raw)
In-Reply-To: <Pine.LNX.4.44L0.0401121119540.1327-100000@ida.rowland.org>
Hi!
> > In 2.4 they all run in interrupt or thread context IIRC.
> > Problematic is the SCSI error handling thread. It can call usb_reset_device()
> > which calls down and does allocations.
> > Does that thread also do the PF_MEMALLOC trick?
>
> In 2.4 it doesn't, which is rather surpising considering how many storage
> devices run over SCSI transports.
>
> In 2.6 it sets PF_IOTHREAD. I don't know if that subsumes the function of
> PF_MEMALLOC or not. The state of kerneldoc for much of the Linux core
> functionality is shocking.
PF_IOTHREAD is there for suspend/resume. It does not affect anything
else.
Pavel
--
When do you have a heart between your knees?
[Johanka's followup: and *two* hearts?]
next prev parent reply other threads:[~2004-01-16 13:15 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-01-11 0:07 USB hangs Alan Cox
2004-01-11 0:23 ` Matthew Dharm
2004-01-11 0:49 ` [linux-usb-devel] " Oliver Neukum
2004-01-11 1:01 ` Matthew Dharm
2004-01-11 1:06 ` Oliver Neukum
2004-01-11 1:40 ` David Brownell
2004-01-11 2:33 ` Alan Cox
2004-01-11 8:02 ` [linux-usb-devel] " Oliver Neukum
2004-01-11 22:39 ` Alan Cox
2004-01-11 23:29 ` Oliver Neukum
2004-01-12 15:53 ` Alan Stern
2004-01-11 23:25 ` David Brownell
2004-01-11 23:31 ` Matthew Dharm
2004-01-12 4:11 ` David Brownell
2004-01-12 7:39 ` Matthew Dharm
2004-01-12 8:37 ` Oliver Neukum
2004-01-12 16:27 ` Alan Stern
2004-01-12 20:56 ` Alan Cox
2004-01-16 13:14 ` Pavel Machek [this message]
2004-01-11 23:33 ` Oliver Neukum
2004-01-12 0:09 ` Alan Cox
2004-01-12 0:25 ` Matthew Dharm
2004-01-11 18:46 ` Lukas Postupa
2004-01-11 20:04 ` Matthew Dharm
-- strict thread matches above, loose matches on Subject: below --
2004-01-28 16:50 [linux-usb-devel] " Martin Bogomolni
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