From: Amir Goldstein <amir73il@gmail.com>
To: Niraj Kulkarni <kulkarniniraj14@gmail.com>
Cc: linux-ext4@vger.kernel.org
Subject: Re: Help required for Debugging JBD
Date: Wed, 22 Jun 2011 09:43:52 +0300 [thread overview]
Message-ID: <BANLkTimhig+_Lb52KMcRyk5S4YQcdYozVg@mail.gmail.com> (raw)
In-Reply-To: <4E00CC36.80707@gmail.com>
On Tue, Jun 21, 2011 at 7:52 PM, Niraj Kulkarni
<kulkarniniraj14@gmail.com> wrote:
> Hi all,
> I have modified my JBD (no change to Ext3) to support
> Transactional-Flash. For that I require only to collect metadata and data
> blocks and send them simultaneously (no transaction record, revoke record
> etc).
It's hard to help without knowing what your patches do in more details.
Could you post the patches or give a more detailed description of how they
work?
For example, how do you collect data blocks without them being already
written? or is this not a requirement for your use case?
> The problem is, though it works well for small number of operations,
> the kernel completely hangs when I run any benchmark (like blogbench or
> postmark) over them. The bad thing is that there is no trace left
> afterwards, ie logs don't contain any message since the operation was
> started, kernel OOPS are not shown, no faults are shown, no panic is shown
> even though I have enabled panic on hard/soft lockup. I have to hard reboot
> machine each time.
Did you try alt+sysrq+w to dump waiting tasks?
> So essentially, I am totally clueless about the point at which it is
> crashing or reason behind it. There is a small possibility that bug may be
> in modified MTD layer (which I've written myself), but since I have run
> unmodified Ext3 on that MTD layer without any bug, the chance of buggy MTD
> layer appears very slim.
>
> Any help in greatly appreciated.
>
> Niraj
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next prev parent reply other threads:[~2011-06-22 6:43 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-06-21 16:52 Help required for Debugging JBD Niraj Kulkarni
2011-06-22 6:43 ` Amir Goldstein [this message]
2011-06-22 18:27 ` Niraj Kulkarni
2011-06-22 19:29 ` Amir Goldstein
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