From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Arjan van de Ven <arjan@infradead.org>,
Ingo Molnar <mingo@elte.hu>,
linux-kernel@vger.kernel.org,
Andrew Morton <akpm@linux-foundation.org>,
Lai Jiangshan <laijs@cn.fujitsu.com>,
Peter Zijlstra <a.p.zijlstra@chello.nl>,
Steven Rostedt <rostedt@goodmis.org>
Subject: Re: [RFC][PATCH] create workqueue threads only when needed
Date: Mon, 02 Feb 2009 17:00:43 +1100 [thread overview]
Message-ID: <1233554443.18767.71.camel@pasglop> (raw)
In-Reply-To: <20090202022414.GA5006@nowhere>
On Mon, 2009-02-02 at 03:24 +0100, Frederic Weisbecker wrote:
> On Mon, Feb 02, 2009 at 08:37:41AM +1100, Benjamin Herrenschmidt wrote:
> >
> > > I don't know, most of those I've looked on are not documented about the reason
> > > for a private workqueue. I guess most of them can use the usual kevent.
> >
> > The main problem with kevent is that it gets clogged up.
>
>
> I don't think so. Here is a snapshot of the workqueue tracer in my
> box currently:
That's not quite what I meant ...
The main problem with keventd I'd say is that it's used in all sort of
exeptional code path (ie, driver reset path, error handling, etc...) for
things that will msleep happily for tenth milliseconds, that sort of
thing.
IE. It will be pretty responsive -in general- but can suffer form
horrible latencies every now and then.
Cheers,
Ben.
next prev parent reply other threads:[~2009-02-02 6:02 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-01-27 0:17 [RFC][PATCH] create workqueue threads only when needed Frederic Weisbecker
2009-01-27 0:30 ` Arjan van de Ven
2009-01-31 18:03 ` Frederic Weisbecker
2009-01-31 18:15 ` Arjan van de Ven
2009-01-31 18:28 ` Frederic Weisbecker
2009-02-01 16:22 ` Stefan Richter
2009-02-01 17:04 ` Arjan van de Ven
2009-02-01 17:40 ` Stefan Richter
2009-02-01 17:47 ` Arjan van de Ven
2009-02-01 18:06 ` Stefan Richter
2009-02-01 18:11 ` Arjan van de Ven
2009-02-01 21:37 ` Benjamin Herrenschmidt
2009-02-02 2:24 ` Frederic Weisbecker
2009-02-02 6:00 ` Benjamin Herrenschmidt [this message]
2009-02-02 8:42 ` Stefan Richter
2009-02-02 9:05 ` Benjamin Herrenschmidt
2009-02-02 9:14 ` Oliver Neukum
2009-02-02 9:46 ` Benjamin Herrenschmidt
2009-02-02 9:58 ` Peter Zijlstra
2009-02-02 10:03 ` Oliver Neukum
2009-02-02 20:44 ` Benjamin Herrenschmidt
2009-02-04 9:54 ` Oliver Neukum
2009-02-02 11:39 ` Stefan Richter
2009-02-02 11:32 ` Frederic Weisbecker
2009-02-02 11:26 ` Frederic Weisbecker
2009-02-02 5:19 ` Arjan van de Ven
2009-02-02 6:01 ` Benjamin Herrenschmidt
2009-02-02 9:01 ` Stefan Richter
2009-02-02 14:45 ` Arjan van de Ven
[not found] ` <20090126162807.1131c777.akpm@linux-foundation.org>
2009-01-27 1:46 ` Oleg Nesterov
2009-01-27 8:40 ` Frederic Weisbecker
2009-01-27 3:07 ` Alasdair G Kergon
2009-01-27 8:57 ` Frederic Weisbecker
2009-01-27 12:43 ` Ingo Molnar
2009-02-02 14:49 ` Daniel Walker
2009-02-02 14:51 ` Frédéric Weisbecker
2009-02-02 15:40 ` Daniel Walker
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