Re: [RFC][PATCH] create workqueue threads only when needed
From: Benjamin Herrenschmidt
Date: Mon Feb 02 2009 - 04:49:22 EST
On Mon, 2009-02-02 at 10:14 +0100, Oliver Neukum wrote:
> Am Monday 02 February 2009 10:05:28 schrieb Benjamin Herrenschmidt:
> > > Work which /may/ sleep longer, for example performs SCSI transactions,
> > > needs to go into a private workqueue or other kind of context.
> >
> > Well, it's a bit silly to allocate a private workqueue with all it's
> > associated per CPU kernel threads for something as rare as resetting
> > your eth NIC ... or even SCSI error handling in fact.
>
> How do you avoid a deadlock if SCSI error handling doesn't use
> a dedicated workqueue?
Something such as slow-work or async funcs (not sure about the later, I
have to look at the implementation) but the basic idea is to have a pool
of threads for "generic" delayed work, when its busy, pick another one,
and the pool itself should resize if there's too much pressure.
Ben.
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/