Shaohua Li writes:
> On Fri, Sep 23, 2016 at 10:32:39AM +0800, Huang, Ying wrote:
>> Rik van Riel writes:
>>
>> > On Thu, 2016-09-22 at 15:56 -0700, Shaohua Li wrote:
>> >> On Wed, Sep 07, 2016 at 09:45:59AM -0700, Huang, Ying wrote:
>> >> >.
>> >> > - It will help the memory fragmentation, esp
On Sun, Sep 25, 2016 at 12:18:49PM -0700, Shaohua Li wrote:
> On Fri, Sep 23, 2016 at 10:32:39AM +0800, Huang, Ying wrote:
> > Rik van Riel writes:
> >
> > > On Thu, 2016-09-22 at 15:56 -0700, Shaohua Li wrote:
> > >> On Wed, Sep 07, 2016 at 09:45:59AM -0700, Huang, Ying wrote:
> > >> >
> > >> >
On Fri, Sep 23, 2016 at 10:32:39AM +0800, Huang, Ying wrote:
> Rik van Riel writes:
>
> > On Thu, 2016-09-22 at 15:56 -0700, Shaohua Li wrote:
> >> On Wed, Sep 07, 2016 at 09:45:59AM -0700, Huang, Ying wrote:
> >> >
> >> > - It will help the memory fragmentation, especially when the THP is
> >>
Rik van Riel writes:
> On Thu, 2016-09-22 at 15:56 -0700, Shaohua Li wrote:
>> On Wed, Sep 07, 2016 at 09:45:59AM -0700, Huang, Ying wrote:
>> >
>> > - It will help the memory fragmentation, especially when the THP is
>> > heavily used by the applications. The 2M continuous pages will
>> > be
Hi, Shaohua,
Thanks for comments!
Shaohua Li writes:
> On Wed, Sep 07, 2016 at 09:45:59AM -0700, Huang, Ying wrote:
>>
>> The advantages of the THP swap support include:
Sorry for confusing. This is the advantages of the final goal, that is,
avoid splitting/collapsing the THP during swap out
On Thu, 2016-09-22 at 15:56 -0700, Shaohua Li wrote:
> On Wed, Sep 07, 2016 at 09:45:59AM -0700, Huang, Ying wrote:
> >
> > - It will help the memory fragmentation, especially when the THP is
> > heavily used by the applications. The 2M continuous pages will
> > be
> > free up after THP swapp
"Chen, Tim C" writes:
>>
>>So this is impossible without THP swapin. While 2M swapout makes a lot of
>>sense, I doubt 2M swapin is really useful. What kind of application is
>>'optimized'
>>to do sequential memory access?
Anything that touches regions larger than 4K and we want to do the
kernel
>
>So this is impossible without THP swapin. While 2M swapout makes a lot of
>sense, I doubt 2M swapin is really useful. What kind of application is
>'optimized'
>to do sequential memory access?
We waste a lot of cpu cycles to re-compact 4K pages back to a large page
under THP. Swapping it back
On Wed, Sep 07, 2016 at 09:45:59AM -0700, Huang, Ying wrote:
>
> The advantages of the THP swap support include:
>
> - Batch the swap operations for the THP to reduce lock
> acquiring/releasing, including allocating/freeing the swap space,
> adding/deleting to/from the swap cache, and writing
Hi Huang,
On Tue, Sep 20, 2016 at 10:54:35AM +0800, Huang, Ying wrote:
> Hi, Minchan,
>
> Minchan Kim writes:
> > Hi Huang,
> >
> > On Sun, Sep 18, 2016 at 09:53:39AM +0800, Huang, Ying wrote:
> >> Minchan Kim writes:
> >>
> >> > On Tue, Sep 13, 2016 at 04:53:49PM +0800, Huang, Ying wrote:
> >
Minchan Kim writes:
> Hi Huang,
>
> On Tue, Sep 20, 2016 at 10:54:35AM +0800, Huang, Ying wrote:
>> Hi, Minchan,
>>
>> Minchan Kim writes:
>> > Hi Huang,
>> >
>> > On Sun, Sep 18, 2016 at 09:53:39AM +0800, Huang, Ying wrote:
>> >> Minchan Kim writes:
>> >>
>> >> > On Tue, Sep 13, 2016 at 04:5
Hi, Minchan,
Minchan Kim writes:
> Hi Huang,
>
> On Sun, Sep 18, 2016 at 09:53:39AM +0800, Huang, Ying wrote:
>> Minchan Kim writes:
>>
>> > On Tue, Sep 13, 2016 at 04:53:49PM +0800, Huang, Ying wrote:
>> >> Minchan Kim writes:
>> >> > On Tue, Sep 13, 2016 at 02:40:00PM +0800, Huang, Ying wrot
On Wed, 7 Sep 2016, Huang, Ying wrote:
> From: Huang Ying
>
> This patchset is to optimize the performance of Transparent Huge Page
> (THP) swap.
>
> Hi, Andrew, could you help me to check whether the overall design is
> reasonable?
>
> Hi, Hugh, Shaohua, Minchan and Rik, could you help me to r
On Mon, 2016-09-19 at 16:11 +0900, Minchan Kim wrote:
> Hi Tim,
>
> On Tue, Sep 13, 2016 at 11:52:27PM +, Chen, Tim C wrote:
> >
> > >
> > > >
> > > >
> > > > - Avoid CPU time for splitting, collapsing THP across swap out/in.
> > > Yes, if you want, please give us how bad it is.
> > >
> >
Hi Tim,
On Tue, Sep 13, 2016 at 11:52:27PM +, Chen, Tim C wrote:
> >>
> >> - Avoid CPU time for splitting, collapsing THP across swap out/in.
> >
> >Yes, if you want, please give us how bad it is.
> >
>
> It could be pretty bad. In an experiment with THP turned on and we
> enter swap, 50% of
Hi Huang,
On Sun, Sep 18, 2016 at 09:53:39AM +0800, Huang, Ying wrote:
> Minchan Kim writes:
>
> > On Tue, Sep 13, 2016 at 04:53:49PM +0800, Huang, Ying wrote:
> >> Minchan Kim writes:
> >> > On Tue, Sep 13, 2016 at 02:40:00PM +0800, Huang, Ying wrote:
> >> >> Minchan Kim writes:
> >> >>
> >>
Minchan Kim writes:
> On Tue, Sep 13, 2016 at 04:53:49PM +0800, Huang, Ying wrote:
>> Minchan Kim writes:
>> > On Tue, Sep 13, 2016 at 02:40:00PM +0800, Huang, Ying wrote:
>> >> Minchan Kim writes:
>> >>
>> >> > Hi Huang,
>> >> >
>> >> > On Fri, Sep 09, 2016 at 01:35:12PM -0700, Huang, Ying wr
>>
>> - Avoid CPU time for splitting, collapsing THP across swap out/in.
>
>Yes, if you want, please give us how bad it is.
>
It could be pretty bad. In an experiment with THP turned on and we
enter swap, 50% of the cpu are spent in the page compaction path.
So if we could deal with units of la
Hello,
On Tue, Sep 13, 2016 at 04:53:49PM +0800, Huang, Ying wrote:
> I am glad to discuss my final goal, that is, swapping out/in the full
> THP without splitting. Why I want to do that is copied as below,
I think that is a fine objective. It wasn't implemented initially just
to keep things sim
On Tue, Sep 13, 2016 at 04:53:49PM +0800, Huang, Ying wrote:
> Minchan Kim writes:
> > On Tue, Sep 13, 2016 at 02:40:00PM +0800, Huang, Ying wrote:
> >> Minchan Kim writes:
> >>
> >> > Hi Huang,
> >> >
> >> > On Fri, Sep 09, 2016 at 01:35:12PM -0700, Huang, Ying wrote:
> >> >
> >> > < snip >
> >
Minchan Kim writes:
> On Tue, Sep 13, 2016 at 02:40:00PM +0800, Huang, Ying wrote:
>> Minchan Kim writes:
>>
>> > Hi Huang,
>> >
>> > On Fri, Sep 09, 2016 at 01:35:12PM -0700, Huang, Ying wrote:
>> >
>> > < snip >
>> >
>> >> >> Recently, the performance of the storage devices improved so fast th
On Tue, Sep 13, 2016 at 02:40:00PM +0800, Huang, Ying wrote:
> Minchan Kim writes:
>
> > Hi Huang,
> >
> > On Fri, Sep 09, 2016 at 01:35:12PM -0700, Huang, Ying wrote:
> >
> > < snip >
> >
> >> >> Recently, the performance of the storage devices improved so fast that
> >> >> we cannot saturate th
Minchan Kim writes:
> Hi Huang,
>
> On Fri, Sep 09, 2016 at 01:35:12PM -0700, Huang, Ying wrote:
>
> < snip >
>
>> >> Recently, the performance of the storage devices improved so fast that
>> >> we cannot saturate the disk bandwidth when do page swap out even on a
>> >> high-end server machine.
Hi Huang,
On Fri, Sep 09, 2016 at 01:35:12PM -0700, Huang, Ying wrote:
< snip >
> >> Recently, the performance of the storage devices improved so fast that
> >> we cannot saturate the disk bandwidth when do page swap out even on a
> >> high-end server machine. Because the performance of the sto
Hi, Minchan,
Minchan Kim writes:
> Hi Huang,
>
> On Wed, Sep 07, 2016 at 09:45:59AM -0700, Huang, Ying wrote:
>> From: Huang Ying
>>
>> This patchset is to optimize the performance of Transparent Huge Page
>> (THP) swap.
>>
>> Hi, Andrew, could you help me to check whether the overall design i
On Fri, 2016-09-09 at 14:43 +0900, Minchan Kim wrote:
> Hi Huang,
>
> On Wed, Sep 07, 2016 at 09:45:59AM -0700, Huang, Ying wrote:
> >
> > From: Huang Ying
> >
> > This patchset is to optimize the performance of Transparent Huge Page
> > (THP) swap.
> >
> > Hi, Andrew, could you help me to che
Hi Huang,
On Wed, Sep 07, 2016 at 09:45:59AM -0700, Huang, Ying wrote:
> From: Huang Ying
>
> This patchset is to optimize the performance of Transparent Huge Page
> (THP) swap.
>
> Hi, Andrew, could you help me to check whether the overall design is
> reasonable?
>
> Hi, Hugh, Shaohua, Mincha
From: Huang Ying
This patchset is to optimize the performance of Transparent Huge Page
(THP) swap.
Hi, Andrew, could you help me to check whether the overall design is
reasonable?
Hi, Hugh, Shaohua, Minchan and Rik, could you help me to review the
swap part of the patchset? Especially [01/10],
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