linux-kernel - Re: [PATCH 1/2] kill-the-bkl/reiserfs: acquire the inode mutex safely

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Date:	Fri, 5 Jun 2009 13:57:32 -0600
From:	"Trenton D. Adams" <trenton.d.adams@...il.com>
To:	Jeff Mahoney <jeffm@...e.com>
Cc:	Frederic Weisbecker <fweisbec@...il.com>,
	Al Viro <viro@...iv.linux.org.uk>,
	Reiserfs <reiserfs-devel@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Stephen Rothwell <sfr@...b.auug.org.au>,
	Chris Mason <chris.mason@...cle.com>,
	Ingo Molnar <mingo@...e.hu>,
	Alexander Beregalov <a.beregalov@...il.com>
Subject: Re: [PATCH 1/2] kill-the-bkl/reiserfs: acquire the inode mutex safely

I'll see if I can try that this weekend.

Thanks.

On Fri, Jun 5, 2009 at 1:30 PM, Jeff Mahoney<jeffm@...e.com> wrote:
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
>
> Trenton D. Adams wrote:
>> FYI: I never did anything specific that I knew of, so I didn't
>> actually notice a delay.  I was rsyncing to a USB key at the time.
>> And seeing it took over an hour, I walked away, so I wouldn't have
>> noticed it.  But, I could fiddle around a little to see if I could get
>> some sort of delay going on.  Any ideas on what I should try?  Then I
>> can do the sysreq+t for you if I can reproduce.
>
> Well if the rsync triggered it, that's a good start.
>
> Try applying the following patch as well. It will cause the hung task detector
> to do a sysrq+t automatically so it's not as much of a guessing game. You'll need to boot with
> hung_task_show_state=1.
>
> - -Jeff
>
> - ---
>  kernel/hung_task.c |   11 +++++++++++
>  1 file changed, 11 insertions(+)
>
> - --- a/kernel/hung_task.c
> +++ b/kernel/hung_task.c
> @@ -56,6 +56,14 @@ static int __init hung_task_panic_setup(
>  }
>  __setup("hung_task_panic=", hung_task_panic_setup);
>
> +unsigned int __read_mostly sysctl_hung_task_show_state;
> +static int __init hung_task_show_state_setup(char *str)
> +{
> +       sysctl_hung_task_show_state = simple_strtoul(str, NULL, 0);
> +       return 1;
> +}
> +__setup("hung_task_show_state=", hung_task_show_state_setup);
> +
>  static int
>  hung_task_panic(struct notifier_block *this, unsigned long event, void *ptr)
>  {
> @@ -102,6 +110,9 @@ static void check_hung_task(struct task_
>
>        touch_nmi_watchdog();
>
> +       if (sysctl_hung_task_show_state)
> +               show_state();
> +
>        if (sysctl_hung_task_panic)
>                panic("hung_task: blocked tasks");
>  }
>
> - --
> Jeff Mahoney
> SUSE Labs
> -----BEGIN PGP SIGNATURE-----
> Version: GnuPG v2.0.9 (GNU/Linux)
> Comment: Using GnuPG with SUSE - http://enigmail.mozdev.org
>
> iEYEARECAAYFAkopcjwACgkQLPWxlyuTD7IEdgCfVVzIL/DA0stfnYEW6aixFwxM
> qIEAnjJjyn6HQAbVIicRYzvNcGvPwbiq
> =z8Pn
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>
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