On Mon, Dec 03, 2012 at 10:52:27AM +0800, Lin Feng wrote:
>
>
> On 11/30/2012 07:00 PM, Mel Gorman wrote:
> >>
> >> Well, that's a fairly low-level implementation detail. A more typical
> >> approach would be to add a new get_user_pages_non_movable() or such.
> >> That would probably have the s
On 11/30/2012 06:47 PM, Andrew Morton wrote:
> On Fri, 30 Nov 2012 18:29:30 +0800 Lin Feng wrote:
>
>>> add a new library function which callers can use before (or after?)
>>> calling get_user_pages[_fast]().
>> Sorry, I'm not quite understand what "library function" function means..
>> Does it
On 11/30/2012 07:00 PM, Mel Gorman wrote:
>>
>> Well, that's a fairly low-level implementation detail. A more typical
>> approach would be to add a new get_user_pages_non_movable() or such.
>> That would probably have the same signature as get_user_pages(), with
>> one additional argument. The
hi Domenico,
Sorry for my late reply and thanks for your attention, see below :)
On 11/30/2012 11:24 PM, Domenico Andreoli wrote:
> On Thu, Nov 29, 2012 at 02:54:58PM +0800, Lin Feng wrote:
>> Hi all,
>
> Hi Lin,
>
>> We encounter a "Resource temporarily unavailable" fail while trying
>> to off
On Thu, Nov 29, 2012 at 02:54:58PM +0800, Lin Feng wrote:
> Hi all,
Hi Lin,
> We encounter a "Resource temporarily unavailable" fail while trying
> to offline a memory section in a movable zone. We found that there are
> some pages can't be migrated. The offline operation fails in function
> mi
On Thu, Nov 29, 2012 at 11:55:02PM -0800, Andrew Morton wrote:
> On Fri, 30 Nov 2012 15:01:26 +0800 Lin Feng wrote:
>
> >
> >
> > On 11/30/2012 01:57 PM, Andrew Morton wrote:
> > > On Fri, 30 Nov 2012 11:42:05 +0800 Lin Feng
> > > wrote:
> > >
> > >> hi Andrew,
> > >>
> > >> On 11/30/2012 07
On Thu, Nov 29, 2012 at 03:39:30PM -0800, Andrew Morton wrote:
> On Thu, 29 Nov 2012 14:54:58 +0800
> Lin Feng wrote:
>
> > Hi all,
> >
> > We encounter a "Resource temporarily unavailable" fail while trying
> > to offline a memory section in a movable zone. We found that there are
> > some pag
On Fri, 30 Nov 2012 18:29:30 +0800 Lin Feng wrote:
> > add a new library function which callers can use before (or after?)
> > calling get_user_pages[_fast]().
> Sorry, I'm not quite understand what "library function" function means..
> Does it means a function aids get_user_pages() or totally wr
On 11/30/2012 03:55 PM, Andrew Morton wrote:
> On Fri, 30 Nov 2012 15:01:26 +0800 Lin Feng wrote:
>
>>
>>
>> On 11/30/2012 01:57 PM, Andrew Morton wrote:
>>> On Fri, 30 Nov 2012 11:42:05 +0800 Lin Feng wrote:
>>>
hi Andrew,
On 11/30/2012 07:39 AM, Andrew Morton wrote:
> Tric
On Fri, 30 Nov 2012 16:13:16 +0900 Kamezawa Hiroyuki
wrote:
> > What about futexes?
> >
>
> IIUC, futex's key is now a pair of (mm,address) or (inode, pgoff).
> Then, get_user_page() in futex.c will release the page by put_page().
> 'struct page' is just touched by get_futex_key() to obtain pag
On Fri, 30 Nov 2012 15:01:26 +0800 Lin Feng wrote:
>
>
> On 11/30/2012 01:57 PM, Andrew Morton wrote:
> > On Fri, 30 Nov 2012 11:42:05 +0800 Lin Feng wrote:
> >
> >> hi Andrew,
> >>
> >> On 11/30/2012 07:39 AM, Andrew Morton wrote:
> >>> Tricky.
> >>>
> >>> I expect the same problem would occ
(2012/11/30 14:57), Andrew Morton wrote:
On Fri, 30 Nov 2012 11:42:05 +0800 Lin Feng wrote:
hi Andrew,
On 11/30/2012 07:39 AM, Andrew Morton wrote:
Tricky.
I expect the same problem would occur with pages which are under
O_DIRECT I/O. Obviously O_DIRECT pages won't be pinned for such long
On 11/30/2012 01:57 PM, Andrew Morton wrote:
> On Fri, 30 Nov 2012 11:42:05 +0800 Lin Feng wrote:
>
>> hi Andrew,
>>
>> On 11/30/2012 07:39 AM, Andrew Morton wrote:
>>> Tricky.
>>>
>>> I expect the same problem would occur with pages which are under
>>> O_DIRECT I/O. Obviously O_DIRECT pages w
On Fri, 30 Nov 2012 11:42:05 +0800 Lin Feng wrote:
> hi Andrew,
>
> On 11/30/2012 07:39 AM, Andrew Morton wrote:
> > Tricky.
> >
> > I expect the same problem would occur with pages which are under
> > O_DIRECT I/O. Obviously O_DIRECT pages won't be pinned for such long
> > periods, but the du
hi Andrew,
On 11/30/2012 07:39 AM, Andrew Morton wrote:
> Tricky.
>
> I expect the same problem would occur with pages which are under
> O_DIRECT I/O. Obviously O_DIRECT pages won't be pinned for such long
> periods, but the durations could still be lengthy (seconds).
the offline retry timeout d
Hi Zach,
Thanks for your advice. So agree, I will look into it to lead aio
to use non-movable pages.
Thanks,
linfeng
On 11/30/2012 08:04 AM, Zach Brown wrote:
>> The best I can think of is to make changes in or around
>> get_user_pages(), to steal the pages from userspace and replace them
>> wi
> The best I can think of is to make changes in or around
> get_user_pages(), to steal the pages from userspace and replace them
> with non-movable ones before pinning them. The performance cost of
> something like this would surely be unacceptable for direct-io, but
> maybe OK for the aio ring an
On Thu, 29 Nov 2012 14:54:58 +0800
Lin Feng wrote:
> Hi all,
>
> We encounter a "Resource temporarily unavailable" fail while trying
> to offline a memory section in a movable zone. We found that there are
> some pages can't be migrated. The offline operation fails in function
> migrate_page_m
Hi all,
We encounter a "Resource temporarily unavailable" fail while trying
to offline a memory section in a movable zone. We found that there are
some pages can't be migrated. The offline operation fails in function
migrate_page_move_mapping() returning -EAGAIN till timeout because
the if asse
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