From: fche@redhat.com (Frank Ch. Eigler)
To: Theodore Ts'o <tytso@mit.edu>
Cc: Mel Gorman <mgorman@suse.de>,
linux-ext4@vger.kernel.org, LKML <linux-kernel@vger.kernel.org>,
Linux-MM <linux-mm@kvack.org>, Jiri Slaby <jslaby@suse.cz>
Subject: Re: Excessive stall times on ext4 in 3.9-rc2
Date: Sun, 07 Apr 2013 17:59:06 -0400 [thread overview]
Message-ID: <y0mwqsehuj9.fsf@fche.csb> (raw)
In-Reply-To: <20130402181940.GA4936@thunk.org> (Theodore Ts'o's message of "Tue, 2 Apr 2013 14:19:40 -0400")
Hi -
tytso wrote:
> So I tried to reproduce the problem, and so I installed systemtap
> (bleeding edge, since otherwise it won't work with development
> kernel), and then rebuilt a kernel with all of the necessary CONFIG
> options enabled:
>
> CONFIG_DEBUG_INFO, CONFIG_KPROBES, CONFIG_RELAY, CONFIG_DEBUG_FS,
> CONFIG_MODULES, CONFIG_MODULE_UNLOAD
> [...]
That sounds about right.
> I then pulled down mmtests, and tried running watch-dstate.pl, which
> is what I assume you were using [...]
I just took a look at the mmtests, particularly the stap-fix.sh stuff.
The heroics therein are really not called for. git kernel developers
should use git systemtap, as has always been the case. All
compatibility hacks in stap-fix.sh have already been merged, in many
cases for months.
> [...]
> semantic error: while resolving probe point: identifier 'kprobe' at /tmp/stapdjN4_l:18:7
> source: probe kprobe.function("get_request_wait")
> ^
> Pass 2: analysis failed. [man error::pass2]
> Unexpected exit of STAP script at ./watch-dstate.pl line 296.
> I have no clue what to do next. Can you give me a hint?
You should see the error::pass2 man page, which refers to
error::reporting, which refers to involving stap folks and running
stap-report to gather needed info.
But in this case, that's unnecessary: the problem is most likely that
the get_request_wait function does not actually exist any longer, since
commit a06e05e6afab70b4b23c0a7975aaeae24b195cd6
Author: Tejun Heo <tj@kernel.org>
Date: Mon Jun 4 20:40:55 2012 -0700
block: refactor get_request[_wait]()
Systemtap could endavour to list roughly-matching functions that do
exist, if you think that's be helpful.
- FChE
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next prev parent reply other threads:[~2013-04-07 21:59 UTC|newest]
Thread overview: 52+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-04-02 14:27 Mel Gorman
2013-04-02 15:00 ` Jiri Slaby
2013-04-02 15:03 ` Zheng Liu
2013-04-02 15:15 ` Mel Gorman
2013-04-02 15:06 ` Theodore Ts'o
2013-04-02 15:14 ` Theodore Ts'o
2013-04-02 18:19 ` Theodore Ts'o
2013-04-07 21:59 ` Frank Ch. Eigler [this message]
2013-04-08 8:36 ` Mel Gorman
2013-04-08 10:52 ` Frank Ch. Eigler
2013-04-08 11:01 ` Theodore Ts'o
2013-04-03 10:19 ` Mel Gorman
2013-04-03 12:05 ` Theodore Ts'o
2013-04-03 15:15 ` Mel Gorman
2013-04-05 22:18 ` Jiri Slaby
2013-04-05 23:16 ` Theodore Ts'o
2013-04-06 7:29 ` Jiri Slaby
2013-04-06 7:37 ` Jiri Slaby
2013-04-06 8:19 ` Jiri Slaby
2013-04-06 13:15 ` Theodore Ts'o
2013-04-10 10:56 ` Mel Gorman
2013-04-10 13:12 ` Theodore Ts'o
2013-04-11 17:04 ` Mel Gorman
2013-04-11 18:35 ` Theodore Ts'o
2013-04-11 21:33 ` Jan Kara
2013-04-12 2:57 ` Theodore Ts'o
2013-04-12 4:50 ` Dave Chinner
2013-04-12 15:19 ` Theodore Ts'o
2013-04-13 1:23 ` Dave Chinner
2013-04-22 14:38 ` Mel Gorman
2013-04-22 22:42 ` Jeff Moyer
2013-04-23 0:02 ` Theodore Ts'o
2013-04-23 9:31 ` Jan Kara
2013-04-23 14:01 ` Mel Gorman
2013-04-24 19:09 ` Jeff Moyer
2013-04-25 12:21 ` Mel Gorman
2013-04-12 9:47 ` Mel Gorman
2013-04-21 0:05 ` Theodore Ts'o
2013-04-21 0:07 ` [PATCH 1/3] ext4: mark all metadata I/O with REQ_META Theodore Ts'o
2013-04-21 0:07 ` [PATCH 2/3] buffer: add BH_Prio and BH_Meta flags Theodore Ts'o
2013-04-21 0:07 ` [PATCH 3/3] ext4: mark metadata blocks using bh flags Theodore Ts'o
2013-04-21 6:09 ` Jiri Slaby
2013-04-21 19:55 ` Theodore Ts'o
2013-04-21 20:48 ` [PATCH 3/3 -v2] " Theodore Ts'o
2013-04-22 12:06 ` [PATCH 1/3] ext4: mark all metadata I/O with REQ_META Zheng Liu
2013-04-23 15:33 ` Excessive stall times on ext4 in 3.9-rc2 Mel Gorman
2013-04-23 15:50 ` Theodore Ts'o
2013-04-23 16:13 ` Mel Gorman
2013-04-12 10:18 ` Tvrtko Ursulin
2013-04-12 9:45 ` Mel Gorman
2013-04-02 23:16 ` Theodore Ts'o
2013-04-03 15:22 ` Mel Gorman
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