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Date: Fri, 5 Jun 2009 13:57:32 -0600
Message-ID: <9b1675090906051257t5aad47capccfcf1c94f863a66@mail.gmail.com>
Subject: Re: [PATCH 1/2] kill-the-bkl/reiserfs: acquire the inode mutex safely
From: "Trenton D. Adams" <trenton.d.adams@gmail.com>
To: Jeff Mahoney <jeffm@suse.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>,
       Al Viro <viro@zeniv.linux.org.uk>,
       Reiserfs <reiserfs-devel@vger.kernel.org>,
       LKML <linux-kernel@vger.kernel.org>,
       Stephen Rothwell <sfr@canb.auug.org.au>,
       Chris Mason <chris.mason@oracle.com>, Ingo Molnar <mingo@elte.hu>,
       Alexander Beregalov <a.beregalov@gmail.com>
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I'll see if I can try that this weekend.

Thanks.

On Fri, Jun 5, 2009 at 1:30 PM, Jeff Mahoney<jeffm@suse.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
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> Comment: Using GnuPG with SUSE - http://enigmail.mozdev.org
>
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