Minchan Kim writes:
> On Fri, Sep 15, 2017 at 11:15:08AM +0800, Huang, Ying wrote:
>> Minchan Kim writes:
>>
>> > On Thu, Sep 14, 2017 at 08:01:30PM +0800, Huang, Ying wrote:
>> >> Minchan Kim writes:
>> >>
>> >> > On Wed, Sep 13, 2017 at 02:02:29PM -0700, Andrew Morton wrote:
>> >> >> On Wed
On Fri, Sep 15, 2017 at 11:15:08AM +0800, Huang, Ying wrote:
> Minchan Kim writes:
>
> > On Thu, Sep 14, 2017 at 08:01:30PM +0800, Huang, Ying wrote:
> >> Minchan Kim writes:
> >>
> >> > On Wed, Sep 13, 2017 at 02:02:29PM -0700, Andrew Morton wrote:
> >> >> On Wed, 13 Sep 2017 10:40:19 +0900 Mi
Minchan Kim writes:
> On Thu, Sep 14, 2017 at 08:01:30PM +0800, Huang, Ying wrote:
>> Minchan Kim writes:
>>
>> > On Wed, Sep 13, 2017 at 02:02:29PM -0700, Andrew Morton wrote:
>> >> On Wed, 13 Sep 2017 10:40:19 +0900 Minchan Kim wrote:
>> >>
>> >> > Every zram users like low-end android devi
On Thu, 14 Sep 2017 22:14:46 +0900 Minchan Kim wrote:
> > Now. Users can choose between VMA based readahead and original
> > readahead via a knob as follow at runtime,
> >
> > /sys/kernel/mm/swap/vma_ra_enabled
>
> It's not a config option and is enabled by default. IOW, it's under the radar
>
On Thu, Sep 14, 2017 at 08:01:30PM +0800, Huang, Ying wrote:
> Minchan Kim writes:
>
> > On Wed, Sep 13, 2017 at 02:02:29PM -0700, Andrew Morton wrote:
> >> On Wed, 13 Sep 2017 10:40:19 +0900 Minchan Kim wrote:
> >>
> >> > Every zram users like low-end android device has used 0 page-cluster
> >
Minchan Kim writes:
> On Wed, Sep 13, 2017 at 02:02:29PM -0700, Andrew Morton wrote:
>> On Wed, 13 Sep 2017 10:40:19 +0900 Minchan Kim wrote:
>>
>> > Every zram users like low-end android device has used 0 page-cluster
>> > to disable swap readahead because it has no seek cost and works as
>> >
On Thu, Sep 14, 2017 at 08:53:04AM +0800, Huang, Ying wrote:
> Hi, Andrew,
>
> Andrew Morton writes:
>
> > On Wed, 13 Sep 2017 10:40:19 +0900 Minchan Kim wrote:
> >
> >> Every zram users like low-end android device has used 0 page-cluster
> >> to disable swap readahead because it has no seek co
On Wed, Sep 13, 2017 at 02:02:29PM -0700, Andrew Morton wrote:
> On Wed, 13 Sep 2017 10:40:19 +0900 Minchan Kim wrote:
>
> > Every zram users like low-end android device has used 0 page-cluster
> > to disable swap readahead because it has no seek cost and works as
> > synchronous IO operation so
Hi, Andrew,
Andrew Morton writes:
> On Wed, 13 Sep 2017 10:40:19 +0900 Minchan Kim wrote:
>
>> Every zram users like low-end android device has used 0 page-cluster
>> to disable swap readahead because it has no seek cost and works as
>> synchronous IO operation so if we do readahead multiple pa
On Wed, 13 Sep 2017 10:40:19 +0900 Minchan Kim wrote:
> Every zram users like low-end android device has used 0 page-cluster
> to disable swap readahead because it has no seek cost and works as
> synchronous IO operation so if we do readahead multiple pages,
> swap falut latency would be (4K * re
On Mon, Aug 07, 2017 at 01:40:36PM +0800, Huang, Ying wrote:
> From: Huang Ying
>
> The swap readahead is an important mechanism to reduce the swap in
> latency. Although pure sequential memory access pattern isn't very
> popular for anonymous memory, the space locality is still considered
> val
From: Huang Ying
The swap readahead is an important mechanism to reduce the swap in
latency. Although pure sequential memory access pattern isn't very
popular for anonymous memory, the space locality is still considered
valid.
In the original swap readahead implementation, the consecutive block
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