From: Janet Morgan <janetmor@us.ibm.com>
To: Daniel McNeil <daniel@osdl.org>
Cc: Andrew Morton <akpm@osdl.org>,
Suparna Bhattacharya <suparna@in.ibm.com>,
Badari Pulavarty <pbadari@us.ibm.com>,
"linux-aio@kvack.org" <linux-aio@kvack.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH linux-2.6.0-test10-mm1] filemap_fdatawait.patch
Date: Wed, 17 Dec 2003 12:17:26 -0800 [thread overview]
Message-ID: <3FE0B9D6.2070902@us.ibm.com> (raw)
In-Reply-To: 1071689105.1826.46.camel@ibm-c.pdx.osdl.net
Daniel McNeil wrote:
>On Tue, 2003-12-16 at 18:03, Andrew Morton wrote:
>
>>Daniel McNeil <daniel@osdl.org> wrote:
>>
>>>I have found something else that might be causing the problem.
>>>filemap_fdatawait() skips pages that are not marked PG_writeback.
>>>However, when a page is going to be written, PG_dirty is cleared
>>>before PG_writeback is set (while the PG_locked is set). So it
>>>looks like filemap_fdatawait() can see a page just before it is
>>>going to be written and not wait for it. Here is a patch that
>>>makes filemap_fdatawait() wait for locked pages as well to make
>>>sure it does not missed any pages.
>>>
>>This filemap_fdatawait() behaviour is as-designed. That function is only
>>responsible for waiting on I/O which was initiated prior to it being
>>invoked. Because it is designed for fsync(), fdatasync(), O_SYNC, msync(),
>>sync(), etc.
>>
>>Now, it could be that this behaviour is not appropriate for the O_DIRECT
>>sync function - the result of your testing will be interesting.
>>
>
>My tests still failed overnight. I was thinking that maybe a
>non-blocking do_writepages() was happening at the same time as
>the filemap_fdatawrite()/filemap_fdatawait(), so even though the
>page was dirty before the filemap_fdatawrite(), it was missed.
>
>Daniel
>
>
I'm wondering if processing in generic_file_direct_IO() shouldn't look
more like
sys_fsync()? When I add to generic_file_direct_IO() a call to
f_op->fsync() between the calls to filemap_fdatawrite() and
filemap_fdatawait(), the test Daniel and I have been running no longer
fails for me. This change would also seem consistent with 2.4, but I
could be way off base.
-Janet
next prev parent reply other threads:[~2003-12-17 20:02 UTC|newest]
Thread overview: 58+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <3FCD4B66.8090905@us.ibm.com>
2003-12-06 1:29 ` [PATCH linux-2.6.0-test10-mm1] dio-read-race-fix Daniel McNeil
2003-12-08 18:23 ` Daniel McNeil
2003-12-12 0:51 ` Daniel McNeil
2003-12-17 1:25 ` [PATCH linux-2.6.0-test10-mm1] filemap_fdatawait.patch Daniel McNeil
2003-12-17 2:03 ` Andrew Morton
2003-12-17 19:25 ` Daniel McNeil
2003-12-17 20:17 ` Janet Morgan [this message]
2003-12-31 9:18 ` Suparna Bhattacharya
2003-12-31 9:35 ` Andrew Morton
2003-12-31 9:55 ` Suparna Bhattacharya
2003-12-31 9:59 ` Andrew Morton
2003-12-31 10:09 ` Suparna Bhattacharya
2003-12-31 10:10 ` Andrew Morton
2003-12-31 10:48 ` Suparna Bhattacharya
2003-12-31 10:53 ` Andrew Morton
2003-12-31 10:54 ` Andrew Morton
2003-12-31 11:17 ` Andrew Morton
2003-12-31 22:34 ` [PATCH linux-2.6.1-rc1-mm1] filemap_fdatawait.patch Daniel McNeil
2003-12-31 22:41 ` [PATCH linux-2.6.1-rc1-mm1] aiodio_fallback_bio_count.patch Daniel McNeil
2003-12-31 23:46 ` Andrew Morton
2004-01-02 5:14 ` Suparna Bhattacharya
2004-01-02 7:46 ` Andrew Morton
2004-01-05 3:55 ` Suparna Bhattacharya
2004-01-05 5:06 ` Andrew Morton
2004-01-05 5:28 ` Suparna Bhattacharya
2004-01-05 5:28 ` Andrew Morton
2004-01-05 6:06 ` Suparna Bhattacharya
2004-01-05 6:14 ` Lincoln Dale
2003-12-31 22:47 ` [PATCH linux-2.6.1-rc1-mm1] dio_isize.patch Daniel McNeil
2003-12-31 23:42 ` [PATCH linux-2.6.1-rc1-mm1] filemap_fdatawait.patch Andrew Morton
2004-01-02 4:20 ` Suparna Bhattacharya
2004-01-02 4:36 ` Andrew Morton
2004-01-02 5:50 ` [PATCH linux-2.6.0-test10-mm1] filemap_fdatawait.patch Suparna Bhattacharya
2004-01-02 7:31 ` Andrew Morton
2004-01-05 13:49 ` Marcelo Tosatti
2004-01-05 20:27 ` Andrew Morton
2004-03-29 15:44 ` Marcelo Tosatti
2004-01-11 23:14 ` Janet Morgan
2004-01-11 23:44 ` Andrew Morton
2004-01-12 18:00 ` filemap_fdatawait.patch Daniel McNeil
2004-01-12 19:39 ` [PATCH linux-2.6.0-test10-mm1] filemap_fdatawait.patch Janet Morgan
2004-01-12 19:46 ` Daniel McNeil
2004-01-13 4:12 ` Janet Morgan
2003-12-30 4:53 ` [PATCH linux-2.6.0-test10-mm1] dio-read-race-fix Suparna Bhattacharya
2003-12-31 0:29 ` Daniel McNeil
2003-12-31 6:09 ` Suparna Bhattacharya
2004-01-08 23:55 ` Daniel McNeil
2004-01-09 3:55 ` Suparna Bhattacharya
2004-02-05 1:39 ` [PATCH 2.6.2-rc3-mm1] DIO read race fix Daniel McNeil
2004-02-05 1:54 ` Badari Pulavarty
2004-02-05 2:07 ` Andrew Morton
2004-02-05 2:54 ` Janet Morgan
2004-02-05 3:19 ` Andrew Morton
2004-02-05 3:43 ` Suparna Bhattacharya
2004-02-05 5:33 ` Andrew Morton
2004-02-05 17:52 ` Daniel McNeil
2004-02-05 18:53 ` Badari Pulavarty
2004-03-29 15:41 ` [PATCH linux-2.6.0-test10-mm1] dio-read-race-fix Suparna Bhattacharya
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