linux-kernel - Re: 2.6.26.3-rt2

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Message-ID: <520f0cf10808211233g1da3f06pf422c26accb70bf@mail.gmail.com>
Date:	Thu, 21 Aug 2008 21:33:33 +0200
From:	"John Kacur" <jkacur@...il.com>
To:	"Steven Rostedt" <rostedt@...dmis.org>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	RT <linux-rt-users@...r.kernel.org>,
	"Ingo Molnar" <mingo@...e.hu>,
	"Thomas Gleixner" <tglx@...utronix.de>,
	"Chirag Jog" <chirag@...ux.vnet.ibm.com>
Subject: Re: 2.6.26.3-rt2

On Thu, Aug 21, 2008 at 7:18 PM, Steven Rostedt <rostedt@...dmis.org> wrote:
> We are pleased to announce the 2.6.26.3-rt2 tree, which can be
> downloaded from the location:
>
>  http://rt.et.redhat.com/download/
>
> Information on the RT patch can be found at:
>
>  http://rt.wiki.kernel.org/index.php/Main_Page
>
> Changes since 2.6.26-rt1
>
>  - ported to 2.6.26.3
>
>  - basic compile fixes (Steven Rostedt)
>
>  - basic raw lock conversions (Steven Rostedt)
>
>  - powerpc: irq radix tree updates (Sebastien Dugue)
>
>  - call_rcu_sched (Paul E. McKenney)
>
>  - rcu trace preemption fixes (Paul E. Mckenney)
>
>  - remove lock in pm_qos_requirement (John Kacur)
>
>  - rcu_process_callbacks (Paul E. McKenney)
>
>  - rcu memory barriers update (Paul E. McKenney)
>
>  - shorten posix_cpu_timers thread names (Arnaldo Carvalho de Melo)
>
>  - account IRQ and RT load in SCHED_OTHER (Peter Zijlstra)
>
>  - seq_lock updates/fixes (Gregory Haskins)
>
> to build a 2.6.26.3-rt2 tree, the following patches should be applied:
>
>  http://www.kernel.org/pub/linux/kernel/v2.6/linux-2.6.26.tar.bz2
>  http://kernel.org/pub/linux/kernel/v2.6/patch-2.6.26.3.bz2
>  http://rt.et.redhat.com/download/patch-2.6.26.3-rt2.bz2
>
>
>
> And like always, my RT version of Matt Mackall's ketchup will get this
> for you nicely:
>
>  http://people.redhat.com/srostedt/rt/tools/ketchup-0.9.8-rt3
>
>
> The broken out patches are also available.
>

Hi Steve

Probably one of the most important patches that was missed is the one
from Chirag. I've taken it and updated it against 2.6.26.3-rt2 for
you, in case that will speed up -rt3 (see attached). (two hunks were
rejected because another applied fix fixed the same thing as part of
Chirag's patch.

I've compiled and done some limited testing, and among other things it
removes this kind of message.
BUG: sleeping function called from invalid context hald-runner(12244)
at kernel/rtmutex.c:743
in_atomic():1 [00000001], irqs_disabled():0
Pid: 12244, comm: hald-runner Tainted: G        W 2.6.26.3-rt2 #1

Call Trace:
 [<ffffffff802d3cda>] ? mnt_want_write+0x19/0xbc
 [<ffffffff802307b6>] __might_sleep+0x12d/0x132
 [<ffffffff8046d3de>] __rt_spin_lock+0x34/0x7d
 [<ffffffff8046d435>] rt_spin_lock+0xe/0x10
 [<ffffffff802d3cfc>] mnt_want_write+0x3b/0xbc
 [<ffffffff802cea88>] touch_atime+0x1c/0x101
 [<ffffffff802c426c>] __link_path_walk+0x484/0xf24
 [<ffffffff802c4d72>] path_walk+0x66/0xc9
 [<ffffffff802c51bf>] do_path_lookup+0x209/0x264
 [<ffffffff802c5509>] __path_lookup_intent_open+0x61/0xa4
 [<ffffffff802c555d>] path_lookup_open+0x11/0x13
 [<ffffffff802c61f1>] do_filp_open+0xb6/0x8f5
 [<ffffffff8046d3de>] ? __rt_spin_lock+0x34/0x7d
 [<ffffffff802b897d>] ? get_unused_fd_flags+0x119/0x12a
 [<ffffffff802b89e4>] do_sys_open+0x56/0xd6
 [<ffffffff8020c374>] ? system_call_after_swapgs+0xc4/0x168
 [<ffffffff802b8a97>] sys_open+0x20/0x22
 [<ffffffff8020c3ab>] system_call_after_swapgs+0xfb/0x168

---------------------------
| preempt count: 00000001 ]
| 1-level deep critical section nesting:
----------------------------------------
.. [<ffffffff802d3cda>] .... mnt_want_write+0x19/0xbc
.....[<ffffffff802cea88>] ..   ( <= touch_atime+0x1c/0x101)

View attachment "fix-bug-messages.patch" of type "text/x-patch" (3502 bytes)