From: Minchan Kim <minchan@kernel.org>
To: Sergey Senozhatsky <sergey.senozhatsky.work@gmail.com>
Cc: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>,
Andrew Morton <akpm@linux-foundation.org>,
linux-mm@kvack.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 0/3] zsmalloc: small compaction improvements
Date: Wed, 15 Jul 2015 09:24:00 +0900 [thread overview]
Message-ID: <20150715002359.GA29240@blaptop.AC68U> (raw)
In-Reply-To: <20150715002106.GA742@swordfish>
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<id>/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 of
> > > >
> > > > But we have zs_can_compact so it can effectively skip the class if it
> > > > is not proper class.
> > >
> > > user triggered compaction can compact too much.
> > > in its current state triggering a compaction from user space is like
> > > playing a lottery or a russian roulette.
> >
> > We were on different page.
>
> > I thought the motivation from this patchset is to prevent compaction
> > overhead by frequent user-driven compaction request because user
> > don't know how they can get free pages by compaction so they should
> > ask compact frequently with blind.
>
> this is exactly the motivation for this patchset. seriously.
User should rely on the auto-compaction.
>
> whatever.
>
> -ss
--
Kind regards,
Minchan Kim
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next prev parent reply other threads:[~2015-07-15 0:24 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-07-11 9:45 [PATCH 0/3] zsmalloc: small compaction improvements Sergey Senozhatsky
2015-07-11 9:45 ` [PATCH 1/3] zsmalloc: factor out zs_pages_to_compact() Sergey Senozhatsky
2015-07-11 9:45 ` [PATCH 2/3] zram: make compact a read-write sysfs node Sergey Senozhatsky
2015-07-11 9:45 ` [PATCH 3/3] zsmalloc: do not take class lock in zs_pages_to_compact() Sergey Senozhatsky
2015-07-15 4:07 ` Sergey Senozhatsky
2015-07-15 23:38 ` Minchan Kim
2015-07-15 23:59 ` Sergey Senozhatsky
2015-07-13 23:36 ` [PATCH 0/3] zsmalloc: small compaction improvements Minchan Kim
2015-07-14 0:31 ` Sergey Senozhatsky
2015-07-14 0:55 ` Minchan Kim
2015-07-14 12:29 ` Sergey Senozhatsky
2015-07-14 16:52 ` Minchan Kim
2015-07-15 0:21 ` Sergey Senozhatsky
2015-07-15 0:24 ` Minchan Kim [this message]
2015-07-15 11:16 ` Sergey Senozhatsky
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