From: Chris Mason <chris.mason@oracle.com>
To: "Zhong, Xin" <xin.zhong@intel.com>
Cc: "Johannes Hirte" <johannes.hirte@fem.tu-ilmenau.de>,
"Maria Wikström" <maria@ponstudios.se>,
"linux-btrfs@vger.kernel.org" <linux-btrfs@vger.kernel.org>
Subject: RE: [PATCH v2]Btrfs: pwrite blocked when writing from the mmaped buffer of the same page
Date: Wed, 23 Feb 2011 16:56:27 -0500 [thread overview]
Message-ID: <1298498150-sup-7270@think> (raw)
In-Reply-To: <1865303E0DED764181A9D882DEF65FB6864AE1B667@shsmsx502.ccr.corp.intel.com>
Excerpts from Zhong, Xin's message of 2011-02-23 02:27:05 -0500:
> In the dmesg of rc4, I can see svn hang in shrink_dellalloc and there's two flush-btrfs threads hang there too.
>
> Josef, it seems you are the expert in this area. Could you take a quick look? Thanks!
Ok, it does look like the fluhs-btrfs threads are busy trying to flush
things.
Could you please do a btrfs-show and a btrfs fi df /xxx (where xxx is
your mount point) and send the results here?
-chris
>
> -----Original Message-----
> From: Johannes Hirte [mailto:johannes.hirte@fem.tu-ilmenau.de]
> Sent: Wednesday, February 23, 2011 6:27 AM
> To: Zhong, Xin
> Cc: Maria Wikstr\xc3\xb6m; linux-btrfs@vger.kernel.org
> Subject: Re: [PATCH v2]Btrfs: pwrite blocked when writing from the mmaped buffer of the same page
>
> On Friday 11 February 2011 05:39:39 Zhong, Xin wrote:
> > Hi,
> >
> > Could you paste the output of sysrq+t here? Thanks!
>
> Sorry for the long delay. I've attached the dmesg output of sysrq-t from
> 2.6.38-rc3 and rc4 as the behavior differs between both versions. With rc3 it don't need any interaction. I start 'emerge sys-devel/libgcrypt', the tasks hangs and top shows a svn process eating 100% CPU. With rc4 the system hangs too but the CPU load stays low. When I try to cancel the emerge process (ctrl
> c) the CPU load goes up and top shows the svn process together with a flush- btrfs task, eating the CPU.
> \xff\xf4\xe8\xba{.n\xc7+\x89\xb7\x9f\xae\x89\xad\x86+%\x8a\xcb\xff\xb1\xe9\xdd\xb6\x17\xa5\x8aw\xff\xba{.n\xc7+\x89\xb7\xa5\x8a{\xb1\xfd\xbbk~\xcf\xe2\x9e\xd8^n\x87r\xa1\xf6\xa6z\xcb\x1a\x81\xebh\x99\xa8\xe8\xad\xda&\xa3\xfb\xe0z\xbf\xe4z\xb9\xde\x97\xfa+\x80\xca+zf\xa3\xa2\xb7h\x9a\x88\xa7~\x86\xad\x86\xdbi\xff\xff\xef\x81\xea\xff\x91\xea\xe7z_\xe8\xae\x0f\xe6j:+v\x89\xa8\xfe)\xdf\xa3\xf8m
next prev parent reply other threads:[~2011-02-23 21:56 UTC|newest]
Thread overview: 43+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-12-09 9:30 [PATCH v2]Btrfs: pwrite blocked when writing from the mmaped buffer of the same page Zhong, Xin
2011-01-27 13:09 ` Johannes Hirte
2011-01-27 22:12 ` Maria Wikström
2011-01-28 1:26 ` Zhong, Xin
2011-01-28 2:54 ` Johannes Hirte
2011-01-28 3:53 ` Zhong, Xin
2011-02-01 23:34 ` Johannes Hirte
2011-02-11 4:39 ` Zhong, Xin
2011-02-18 11:31 ` Maria Wikström
2011-02-21 1:51 ` Zhong, Xin
2011-02-24 14:51 ` Maria Wikström
2011-02-24 15:55 ` Mitch Harder
2011-02-24 16:00 ` Chris Mason
2011-02-24 16:03 ` Mitch Harder
2011-02-24 16:19 ` Chris Mason
2011-02-24 16:32 ` Mitch Harder
[not found] ` <AANLkTinvyb-bTVVignd1KGojvh-QrYCFmCnwYKBsYC_2@mail.gmail.com>
2011-02-25 17:11 ` Mitch Harder
2011-02-25 18:43 ` Mitch Harder
2011-02-25 19:19 ` Chris Mason
2011-02-28 1:46 ` [PATCH] btrfs file write debugging patch Chris Mason
2011-02-28 8:56 ` Zhong, Xin
2011-02-28 14:02 ` Chris Mason
2011-02-28 10:13 ` Johannes Hirte
2011-02-28 14:00 ` Chris Mason
2011-02-28 16:10 ` Josef Bacik
2011-02-28 16:45 ` Maria Wikström
2011-02-28 17:47 ` Mitch Harder
2011-02-28 20:20 ` Mitch Harder
2011-03-01 5:09 ` Mitch Harder
2011-03-01 10:14 ` Zhong, Xin
2011-03-01 11:56 ` Zhong, Xin
2011-03-01 14:54 ` Mitch Harder
2011-03-01 14:51 ` Mitch Harder
2011-03-01 21:56 ` Piotr Szymaniak
2011-02-24 23:35 ` [PATCH v2]Btrfs: pwrite blocked when writing from the mmaped buffer of the same page Piotr Szymaniak
2011-02-22 22:27 ` Johannes Hirte
2011-02-23 7:27 ` Zhong, Xin
2011-02-23 21:56 ` Chris Mason [this message]
2011-02-23 23:02 ` Johannes Hirte
2011-02-24 15:23 ` Chris Mason
2011-01-28 16:47 ` Maria Wikström
2011-01-28 18:27 ` Rui Miguel Silva
2011-01-29 15:38 ` Maria Wikström
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