2014-08-02 오전 1:04, Peter Zijlstra 쓴 글:
On Fri, Aug 01, 2014 at 05:24:59PM +0200, Jan Kara wrote:
OK, makes sense. But then if there's heavy IO going on, anything that has
IO pending on it is pinned and IO completion can easily take something
close to a second or more. So meeting subsecond
On Fri, Aug 01, 2014 at 05:24:59PM +0200, Jan Kara wrote:
> OK, makes sense. But then if there's heavy IO going on, anything that has
> IO pending on it is pinned and IO completion can easily take something
> close to a second or more. So meeting subsecond deadlines may be tough even
> for ordin
On Fri 01-08-14 15:36:18, Peter Zijlstra wrote:
> On Fri, Aug 01, 2014 at 11:57:00AM +0200, Jan Kara wrote:
> > So the quiestion really is how hard guarantee do you need that a page in
> > movable zone is really movable. Or better in what timeframe should it be
> > movable? It may be possible to ma
On Fri, Aug 01, 2014 at 11:57:00AM +0200, Jan Kara wrote:
> So the quiestion really is how hard guarantee do you need that a page in
> movable zone is really movable. Or better in what timeframe should it be
> movable? It may be possible to make e.g. migratepage callback for ext4
> blkdev pages whi
On Fri 01-08-14 10:06:40, Gioh Kim wrote:
> Function path is like followings:
>
> [ 97.868304] [<8011a750>] (drop_buffers+0xfc/0x168) from [<8011bc64>]
> (try_to_free_buffers+0x50/0xbc)
> [ 97.877457] [<8011bc64>] (try_to_free_buffers+0x50/0xbc) from [<80121e40>]
> (blkdev_releasepage+0x38/0
On Fri 01-08-14 17:34:46, Joonsoo Kim wrote:
> On Thu, Jul 31, 2014 at 02:21:14PM +0200, Jan Kara wrote:
> > On Thu 31-07-14 09:37:15, Gioh Kim wrote:
> > >
> > >
> > > 2014-07-31 오전 9:03, Jan Kara 쓴 글:
> > > >On Thu 31-07-14 08:54:40, Gioh Kim wrote:
> > > >>2014-07-30 오후 7:11, Jan Kara 쓴 글:
> >
On Thu, Jul 31, 2014 at 02:21:14PM +0200, Jan Kara wrote:
> On Thu 31-07-14 09:37:15, Gioh Kim wrote:
> >
> >
> > 2014-07-31 오전 9:03, Jan Kara 쓴 글:
> > >On Thu 31-07-14 08:54:40, Gioh Kim wrote:
> > >>2014-07-30 오후 7:11, Jan Kara 쓴 글:
> > >>>On Wed 30-07-14 16:44:24, Gioh Kim wrote:
> > 2014-
2014-08-01 오전 9:07, Gioh Kim 쓴 글:
2014-07-31 오후 9:21, Jan Kara 쓴 글:
On Thu 31-07-14 09:37:15, Gioh Kim wrote:
2014-07-31 오전 9:03, Jan Kara 쓴 글:
On Thu 31-07-14 08:54:40, Gioh Kim wrote:
2014-07-30 오후 7:11, Jan Kara 쓴 글:
On Wed 30-07-14 16:44:24, Gioh Kim wrote:
2014-07-22 오후 6:38, Jan
2014-07-31 오후 9:21, Jan Kara 쓴 글:
On Thu 31-07-14 09:37:15, Gioh Kim wrote:
2014-07-31 오전 9:03, Jan Kara 쓴 글:
On Thu 31-07-14 08:54:40, Gioh Kim wrote:
2014-07-30 오후 7:11, Jan Kara 쓴 글:
On Wed 30-07-14 16:44:24, Gioh Kim wrote:
2014-07-22 오후 6:38, Jan Kara 쓴 글:
On Tue 22-07-14 09:30:05,
On Thu 31-07-14 09:37:15, Gioh Kim wrote:
>
>
> 2014-07-31 오전 9:03, Jan Kara 쓴 글:
> >On Thu 31-07-14 08:54:40, Gioh Kim wrote:
> >>2014-07-30 오후 7:11, Jan Kara 쓴 글:
> >>>On Wed 30-07-14 16:44:24, Gioh Kim wrote:
> 2014-07-22 오후 6:38, Jan Kara 쓴 글:
> >On Tue 22-07-14 09:30:05, Peter Zijlst
2014-07-31 오전 9:03, Jan Kara 쓴 글:
On Thu 31-07-14 08:54:40, Gioh Kim wrote:
2014-07-30 오후 7:11, Jan Kara 쓴 글:
On Wed 30-07-14 16:44:24, Gioh Kim wrote:
2014-07-22 오후 6:38, Jan Kara 쓴 글:
On Tue 22-07-14 09:30:05, Peter Zijlstra wrote:
On Tue, Jul 22, 2014 at 02:18:47PM +0900, Gioh Kim wrote
On Thu 31-07-14 08:54:40, Gioh Kim wrote:
> 2014-07-30 오후 7:11, Jan Kara 쓴 글:
> >On Wed 30-07-14 16:44:24, Gioh Kim wrote:
> >>2014-07-22 오후 6:38, Jan Kara 쓴 글:
> >>>On Tue 22-07-14 09:30:05, Peter Zijlstra wrote:
> On Tue, Jul 22, 2014 at 02:18:47PM +0900, Gioh Kim wrote:
> >Hello,
> >
2014-07-30 오후 7:11, Jan Kara 쓴 글:
On Wed 30-07-14 16:44:24, Gioh Kim wrote:
2014-07-22 오후 6:38, Jan Kara 쓴 글:
On Tue 22-07-14 09:30:05, Peter Zijlstra wrote:
On Tue, Jul 22, 2014 at 02:18:47PM +0900, Gioh Kim wrote:
Hello,
This patch try to solve problem that a long-lasting page cache of
e
2014-07-30 오후 7:19, Peter Zijlstra 쓴 글:
On Wed, Jul 30, 2014 at 12:11:43PM +0200, Jan Kara wrote:
sb_bread allocates page from movable area but it is not movable until the
reference counter of the buffer-head becomes zero.
There is no lock for the buffer but the reference counter acts like loc
On Wed, Jul 30, 2014 at 12:11:43PM +0200, Jan Kara wrote:
> > sb_bread allocates page from movable area but it is not movable until the
> > reference counter of the buffer-head becomes zero.
> > There is no lock for the buffer but the reference counter acts like lock.
> OK, but why do you care ab
On Wed 30-07-14 16:44:24, Gioh Kim wrote:
> 2014-07-22 오후 6:38, Jan Kara 쓴 글:
> >On Tue 22-07-14 09:30:05, Peter Zijlstra wrote:
> >>On Tue, Jul 22, 2014 at 02:18:47PM +0900, Gioh Kim wrote:
> >>>Hello,
> >>>
> >>>This patch try to solve problem that a long-lasting page cache of
> >>>ext4 superbloc
Adding Marek & Tomasz,
On Wed, Jul 30, 2014 at 4:44 PM, Gioh Kim wrote:
>
>
> 2014-07-22 오후 6:38, Jan Kara 쓴 글:
>
>> On Tue 22-07-14 09:30:05, Peter Zijlstra wrote:
>>>
>>> On Tue, Jul 22, 2014 at 02:18:47PM +0900, Gioh Kim wrote:
Hello,
This patch try to solve problem that a
2014-07-27 오전 10:01, Theodore Ts'o 쓴 글:
Gioh,
As follow up, if you want some further discussions about why these
patches should be accepted, it would be good to get some hard data
about why the keeping the ext4 superblock pinned is causing such a
problem for page migation. Can you give us mor
2014-07-22 오후 6:38, Jan Kara 쓴 글:
On Tue 22-07-14 09:30:05, Peter Zijlstra wrote:
On Tue, Jul 22, 2014 at 02:18:47PM +0900, Gioh Kim wrote:
Hello,
This patch try to solve problem that a long-lasting page cache of
ext4 superblock disturbs page migration.
I've been testing CMA feature on my A
Gioh,
As follow up, if you want some further discussions about why these
patches should be accepted, it would be good to get some hard data
about why the keeping the ext4 superblock pinned is causing such a
problem for page migation. Can you give us more details about what
the impact is of not ha
On Tue 22-07-14 09:30:05, Peter Zijlstra wrote:
> On Tue, Jul 22, 2014 at 02:18:47PM +0900, Gioh Kim wrote:
> > Hello,
> >
> > This patch try to solve problem that a long-lasting page cache of
> > ext4 superblock disturbs page migration.
> >
> > I've been testing CMA feature on my ARM-based platf
On Tue, Jul 22, 2014 at 09:30:05AM +0200, Peter Zijlstra wrote:
> > I introduce a new API for allocating page from non-movable area.
> > It is useful for ext4 and others that want to hold page cache for a long
> > time.
>
> There's no word on why you can't teach ext4 to still migrate that page.
>
On Tue, Jul 22, 2014 at 02:18:47PM +0900, Gioh Kim wrote:
> Hello,
>
> This patch try to solve problem that a long-lasting page cache of
> ext4 superblock disturbs page migration.
>
> I've been testing CMA feature on my ARM-based platform
> and found some pages for page caches cannot be migrated.
Hello,
This patch try to solve problem that a long-lasting page cache of
ext4 superblock disturbs page migration.
I've been testing CMA feature on my ARM-based platform
and found some pages for page caches cannot be migrated.
Some of them are page caches of superblock of ext4 filesystem.
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