From: Peter Zijlstra <peterz@infradead.org>
To: David Miller <davem@davemloft.net>
Cc: jarkao2@gmail.com, Larry.Finger@lwfinger.net, kaber@trash.net,
torvalds@linux-foundation.org, akpm@linux-foundation.org,
netdev@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-wireless@vger.kernel.org, mingo@redhat.com,
nickpiggin@yahoo.com.au, paulmck@linux.vnet.ibm.com
Subject: Re: Kernel WARNING: at net/core/dev.c:1330 __netif_schedule+0x2c/0x98()
Date: Thu, 24 Jul 2008 12:08:56 +0200 [thread overview]
Message-ID: <1216894136.7257.266.camel@twins> (raw)
In-Reply-To: <20080724.023210.229338550.davem@davemloft.net>
On Thu, 2008-07-24 at 02:32 -0700, David Miller wrote:
> From: Peter Zijlstra <peterz@infradead.org>
> Date: Thu, 24 Jul 2008 11:27:05 +0200
>
> > Well, not only lockdep, taking a very large number of locks is expensive
> > as well.
>
> Right now it would be on the order of 16 or 32 for
> real hardware.
>
> Much less than the scheduler currently takes on some
> of my systems, so currently you are the pot calling the
> kettle black. :-)
One nit, and then I'll let this issue rest :-)
The scheduler has a long lock dependancy chain (nr_cpu_ids rq locks),
but it never takes all of them at the same time. Any one code path will
at most hold two rq locks.
next prev parent reply other threads:[~2008-07-24 10:09 UTC|newest]
Thread overview: 83+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20080721133059.GA30637@elte.hu>
[not found] ` <20080721134506.GA27598@elte.hu>
[not found] ` <20080721143023.GA32451@elte.hu>
2008-07-21 15:10 ` [crash] BUG: unable to handle kernel NULL pointer dereference at 0000000000000370 David Miller
[not found] ` <20080721150446.GA17746@elte.hu>
2008-07-21 15:24 ` David Miller
2008-07-21 18:18 ` Ian Schram
2008-07-21 19:06 ` Ingo Molnar
2008-07-21 19:13 ` Larry Finger
2008-07-21 19:34 ` Ingo Molnar
2008-07-21 19:43 ` Larry Finger
2008-07-21 19:47 ` Linus Torvalds
2008-07-21 20:15 ` David Miller
2008-07-21 20:28 ` Larry Finger
2008-07-21 20:21 ` David Miller
2008-07-21 20:38 ` Larry Finger
2008-07-21 20:46 ` David Miller
2008-07-21 20:51 ` Patrick McHardy
2008-07-21 21:01 ` David Miller
2008-07-21 21:06 ` Patrick McHardy
2008-07-21 21:35 ` Patrick McHardy
2008-07-21 21:42 ` Patrick McHardy
2008-07-21 21:51 ` Larry Finger
2008-07-21 22:04 ` Patrick McHardy
2008-07-21 22:40 ` Larry Finger
2008-07-21 23:15 ` David Miller
2008-07-22 6:34 ` Larry Finger
2008-07-22 10:51 ` Jarek Poplawski
2008-07-22 11:32 ` David Miller
2008-07-22 12:52 ` Larry Finger
2008-07-22 20:43 ` David Miller
2008-07-22 13:02 ` Larry Finger
2008-07-22 14:53 ` Patrick McHardy
2008-07-22 21:17 ` David Miller
2008-07-22 16:39 ` Kernel WARNING: at net/core/dev.c:1330 __netif_schedule+0x2c/0x98() Larry Finger
2008-07-22 17:20 ` Patrick McHardy
2008-07-22 18:39 ` Larry Finger
2008-07-22 18:44 ` Patrick McHardy
2008-07-22 19:30 ` Larry Finger
2008-07-22 23:04 ` David Miller
2008-07-23 6:20 ` Jarek Poplawski
2008-07-23 7:59 ` David Miller
2008-07-23 8:54 ` Jarek Poplawski
2008-07-23 9:03 ` Peter Zijlstra
2008-07-23 9:35 ` Jarek Poplawski
2008-07-23 9:50 ` Peter Zijlstra
2008-07-23 10:13 ` Jarek Poplawski
2008-07-23 10:58 ` Peter Zijlstra
2008-07-23 11:35 ` Jarek Poplawski
2008-07-23 11:49 ` Jarek Poplawski
2008-07-23 20:16 ` David Miller
2008-07-23 20:43 ` Jarek Poplawski
2008-07-23 20:55 ` David Miller
2008-07-24 9:10 ` Peter Zijlstra
2008-07-24 9:20 ` David Miller
2008-07-24 9:27 ` Peter Zijlstra
2008-07-24 9:32 ` David Miller
2008-07-24 10:08 ` Peter Zijlstra [this message]
2008-07-24 10:38 ` Nick Piggin
2008-07-24 10:55 ` Miklos Szeredi
2008-07-24 11:06 ` Nick Piggin
2008-08-01 21:10 ` Paul E. McKenney
2008-07-24 10:59 ` Peter Zijlstra
2008-08-01 21:10 ` Paul E. McKenney
2008-07-23 20:14 ` David Miller
2008-07-24 7:00 ` Peter Zijlstra
2008-07-25 17:04 ` Ingo Oeser
2008-07-25 18:36 ` Jarek Poplawski
2008-07-25 19:16 ` Johannes Berg
2008-07-25 19:34 ` Jarek Poplawski
2008-07-25 19:36 ` Johannes Berg
2008-07-25 20:01 ` Jarek Poplawski
2008-07-26 9:18 ` David Miller
2008-07-26 10:53 ` Jarek Poplawski
2008-07-26 13:18 ` Jarek Poplawski
2008-07-27 0:34 ` David Miller
2008-07-27 20:37 ` Jarek Poplawski
2008-07-31 12:29 ` David Miller
2008-07-31 12:38 ` Nick Piggin
2008-07-31 12:44 ` David Miller
2008-08-01 4:27 ` David Miller
2008-08-01 7:09 ` Peter Zijlstra
2008-08-01 6:48 ` Jarek Poplawski
2008-08-01 7:00 ` David Miller
2008-08-01 7:01 ` Jarek Poplawski
2008-08-01 7:01 ` David Miller
2008-08-01 7:41 ` Jarek Poplawski
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