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From: Johannes Weiner <hannes@cmpxchg.org>
To: Minchan Kim <minchan@kernel.org>
Cc: Andrew Morton <akpm@linux-foundation.org>,
	linux-kernel@vger.kernel.org, linux-mm@kvack.org,
	Rik van Riel <riel@redhat.com>,
	Sangwoo Park <sangwoo2.park@lge.com>
Subject: Re: [PATCH v1 3/3] mm: per-process reclaim
Date: Thu, 16 Jun 2016 10:41:02 -0400	[thread overview]
Message-ID: <20160616144102.GA17692@cmpxchg.org> (raw)
In-Reply-To: <20160615004027.GA17127@bbox>

On Wed, Jun 15, 2016 at 09:40:27AM +0900, Minchan Kim wrote:
> A question is it seems cgroup2 doesn't have per-cgroup swappiness.
> Why?
> 
> I think we need it in one-cgroup-per-app model.

Can you explain why you think that?

As we have talked about this recently in the LRU balancing thread,
swappiness is the cost factor between file IO and swapping, so the
only situation I can imagine you'd need a memcg swappiness setting is
when you have different cgroups use different storage devices that do
not have comparable speeds.

So I'm not sure I understand the relationship to an app-group model.

WARNING: multiple messages have this Message-ID (diff)
From: Johannes Weiner <hannes@cmpxchg.org>
To: Minchan Kim <minchan@kernel.org>
Cc: Andrew Morton <akpm@linux-foundation.org>,
	linux-kernel@vger.kernel.org, linux-mm@kvack.org,
	Rik van Riel <riel@redhat.com>,
	Sangwoo Park <sangwoo2.park@lge.com>
Subject: Re: [PATCH v1 3/3] mm: per-process reclaim
Date: Thu, 16 Jun 2016 10:41:02 -0400	[thread overview]
Message-ID: <20160616144102.GA17692@cmpxchg.org> (raw)
In-Reply-To: <20160615004027.GA17127@bbox>

On Wed, Jun 15, 2016 at 09:40:27AM +0900, Minchan Kim wrote:
> A question is it seems cgroup2 doesn't have per-cgroup swappiness.
> Why?
> 
> I think we need it in one-cgroup-per-app model.

Can you explain why you think that?

As we have talked about this recently in the LRU balancing thread,
swappiness is the cost factor between file IO and swapping, so the
only situation I can imagine you'd need a memcg swappiness setting is
when you have different cgroups use different storage devices that do
not have comparable speeds.

So I'm not sure I understand the relationship to an app-group model.

--
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  parent reply	other threads:[~2016-06-16 14:41 UTC|newest]

Thread overview: 41+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-06-13  7:50 [PATCH v1 0/3] per-process reclaim Minchan Kim
2016-06-13  7:50 ` Minchan Kim
2016-06-13  7:50 ` [PATCH v1 1/3] mm: vmscan: refactoring force_reclaim Minchan Kim
2016-06-13  7:50   ` Minchan Kim
2016-06-13  7:50 ` [PATCH v1 2/3] mm: vmscan: shrink_page_list with multiple zones Minchan Kim
2016-06-13  7:50   ` Minchan Kim
2016-06-13  7:50 ` [PATCH v1 3/3] mm: per-process reclaim Minchan Kim
2016-06-13  7:50   ` Minchan Kim
2016-06-13 15:06   ` Johannes Weiner
2016-06-13 15:06     ` Johannes Weiner
2016-06-15  0:40     ` Minchan Kim
2016-06-15  0:40       ` Minchan Kim
2016-06-16 11:07       ` Michal Hocko
2016-06-16 11:07         ` Michal Hocko
2016-06-16 14:41       ` Johannes Weiner [this message]
2016-06-16 14:41         ` Johannes Weiner
2016-06-17  6:43         ` Minchan Kim
2016-06-17  6:43           ` Minchan Kim
2016-06-17  7:24     ` Balbir Singh
2016-06-17  7:24       ` Balbir Singh
2016-06-17  7:57       ` Vinayak Menon
2016-06-17  7:57         ` Vinayak Menon
2016-06-13 17:06   ` Rik van Riel
2016-06-15  1:01     ` Minchan Kim
2016-06-15  1:01       ` Minchan Kim
2016-06-13 11:50 ` [PATCH v1 0/3] " Chen Feng
2016-06-13 11:50   ` Chen Feng
2016-06-13 12:22   ` ZhaoJunmin Zhao(Junmin)
2016-06-13 12:22     ` ZhaoJunmin Zhao(Junmin)
2016-06-15  0:43   ` Minchan Kim
2016-06-15  0:43     ` Minchan Kim
2016-06-13 13:29 ` Vinayak Menon
2016-06-13 13:29   ` Vinayak Menon
2016-06-15  0:57   ` Minchan Kim
2016-06-15  0:57     ` Minchan Kim
2016-06-16  4:21     ` Vinayak Menon
2016-06-16  4:21       ` Vinayak Menon
     [not found] <040501d1c55a$81d51910$857f4b30$@alibaba-inc.com>
2016-06-13 10:07 ` [PATCH v1 3/3] mm: " Hillf Danton
2016-06-13 10:07   ` Hillf Danton
2016-06-15  0:46   ` Minchan Kim
2016-06-15  0:46     ` Minchan Kim

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