On (07/15/15 09:24), Minchan Kim wrote:
> On Wed, Jul 15, 2015 at 09:21:06AM +0900, Sergey Senozhatsky wrote:
> > On (07/15/15 01:52), Minchan Kim wrote:
> > > > alrighty... again...
> > > >
> > > > > >
> > > > > > /sys/block/zram/compact is a black box. We provide it, we don't
> > > > > > thrott
On Wed, Jul 15, 2015 at 09:21:06AM +0900, Sergey Senozhatsky wrote:
> On (07/15/15 01:52), Minchan Kim wrote:
> > > alrighty... again...
> > >
> > > > >
> > > > > /sys/block/zram/compact is a black box. We provide it, we don't
> > > > > throttle it in the kernel, and user space is absolutely clue
On (07/15/15 01:52), Minchan Kim wrote:
> > alrighty... again...
> >
> > > >
> > > > /sys/block/zram/compact is a black box. We provide it, we don't
> > > > throttle it in the kernel, and user space is absolutely clueless when
> > > > it invokes compaction. From some remote (or alternative) point
Hi Sergey,
On Tue, Jul 14, 2015 at 09:29:32PM +0900, Sergey Senozhatsky wrote:
> On (07/14/15 09:55), Minchan Kim wrote:
> > > It depends on 'big overhead' definition, of course. We don't care
> > > that much when compaction is issued by the shrinker, because things
> > > are getting bad and we ca
On (07/14/15 09:55), Minchan Kim wrote:
> > It depends on 'big overhead' definition, of course. We don't care
> > that much when compaction is issued by the shrinker, because things
> > are getting bad and we can sacrifice performance. But user triggered
> > compaction on a I/O pressured device can
On Tue, Jul 14, 2015 at 09:31:32AM +0900, Sergey Senozhatsky wrote:
> Hello Minchan,
>
> On (07/14/15 08:36), Minchan Kim wrote:
> [..]
> > > if [ `cat /sys/block/zram/compact` -gt 10 ]; then
> > > echo 1 > /sys/block/zram/compact;
> > > fi
> > >
> > > Up until now user spac
Hello Minchan,
On (07/14/15 08:36), Minchan Kim wrote:
[..]
> > if [ `cat /sys/block/zram/compact` -gt 10 ]; then
> > echo 1 > /sys/block/zram/compact;
> > fi
> >
> > Up until now user space could not tell whether compaction
> > will result in any gain.
>
> First of all, th
Hello Sergey,
On Sat, Jul 11, 2015 at 06:45:29PM +0900, Sergey Senozhatsky wrote:
> Hello,
>
> First two patches introduce new zsmalloc zs_pages_to_compact()
> symbol and change zram's `compact' sysfs attribute to be
> read-write:
> -- write triggers compaction, no changes
> -- read returns the n
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