From: Johannes Weiner <hannes@cmpxchg.org>
To: Minchan Kim <minchan@kernel.org>
Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org,
Andrew Morton <akpm@linux-foundation.org>,
Rik van Riel <riel@redhat.com>, Mel Gorman <mgorman@suse.de>,
Andrea Arcangeli <aarcange@redhat.com>,
Andi Kleen <andi@firstfloor.org>, Michal Hocko <mhocko@suse.cz>,
Tim Chen <tim.c.chen@linux.intel.com>,
kernel-team@fb.com
Subject: Re: [PATCH 01/10] mm: allow swappiness that prefers anon over file
Date: Thu, 9 Jun 2016 09:32:05 -0400 [thread overview]
Message-ID: <20160609133205.GA11719@cmpxchg.org> (raw)
In-Reply-To: <20160609010107.GF28620@bbox>
On Thu, Jun 09, 2016 at 10:01:07AM +0900, Minchan Kim wrote:
> A system has big HDD storage and SSD swap.
>
> HDD: 200 IOPS
> SSD: 100000 IOPS
> From https://en.wikipedia.org/wiki/IOPS
>
> So, speed gap is 500x.
> x + 500x = 200
> If we use PCIe-SSD, the gap will be larger.
> That's why I said 200 is enough to represent speed gap.
Ah, I see what you're saying.
Yeah, that's unfortunately a limitation in the current ABI. Extending
the range to previously unavailable settings is doable; changing the
meaning of existing values is not. We'd have to add another interface.
> Such system configuration is already non-sense so it is okay to ignore such
> usecases?
I'm not sure we have to be proactive about it, but we can always add a
more fine-grained knob to override swappiness when somebody wants to
use such a setup in practice.
next prev parent reply other threads:[~2016-06-09 13:32 UTC|newest]
Thread overview: 67+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-06-06 19:48 [PATCH 00/10] mm: balance LRU lists based on relative thrashing Johannes Weiner
2016-06-06 19:48 ` [PATCH 01/10] mm: allow swappiness that prefers anon over file Johannes Weiner
2016-06-07 0:25 ` Minchan Kim
2016-06-07 14:18 ` Johannes Weiner
2016-06-08 0:06 ` Minchan Kim
2016-06-08 15:58 ` Johannes Weiner
2016-06-09 1:01 ` Minchan Kim
2016-06-09 13:32 ` Johannes Weiner [this message]
2016-06-06 19:48 ` [PATCH 02/10] mm: swap: unexport __pagevec_lru_add() Johannes Weiner
2016-06-06 21:32 ` Rik van Riel
2016-06-07 9:07 ` Michal Hocko
2016-06-08 7:14 ` Minchan Kim
2016-06-06 19:48 ` [PATCH 03/10] mm: fold and remove lru_cache_add_anon() and lru_cache_add_file() Johannes Weiner
2016-06-06 21:33 ` Rik van Riel
2016-06-07 9:12 ` Michal Hocko
2016-06-08 7:24 ` Minchan Kim
2016-06-06 19:48 ` [PATCH 04/10] mm: fix LRU balancing effect of new transparent huge pages Johannes Weiner
2016-06-06 21:36 ` Rik van Riel
2016-06-07 9:19 ` Michal Hocko
2016-06-08 7:28 ` Minchan Kim
2016-06-06 19:48 ` [PATCH 05/10] mm: remove LRU balancing effect of temporary page isolation Johannes Weiner
2016-06-06 21:56 ` Rik van Riel
2016-06-06 22:15 ` Johannes Weiner
2016-06-07 1:11 ` Rik van Riel
2016-06-07 13:57 ` Johannes Weiner
2016-06-07 9:26 ` Michal Hocko
2016-06-07 14:06 ` Johannes Weiner
2016-06-07 9:49 ` Michal Hocko
2016-06-08 7:39 ` Minchan Kim
2016-06-08 16:02 ` Johannes Weiner
2016-06-06 19:48 ` [PATCH 06/10] mm: remove unnecessary use-once cache bias from LRU balancing Johannes Weiner
2016-06-07 2:20 ` Rik van Riel
2016-06-07 14:11 ` Johannes Weiner
2016-06-08 8:03 ` Minchan Kim
2016-06-08 12:31 ` Michal Hocko
2016-06-06 19:48 ` [PATCH 07/10] mm: base LRU balancing on an explicit cost model Johannes Weiner
2016-06-06 19:13 ` kbuild test robot
2016-06-07 2:34 ` Rik van Riel
2016-06-07 14:12 ` Johannes Weiner
2016-06-08 8:14 ` Minchan Kim
2016-06-08 16:06 ` Johannes Weiner
2016-06-08 12:51 ` Michal Hocko
2016-06-08 16:16 ` Johannes Weiner
2016-06-09 12:18 ` Michal Hocko
2016-06-09 13:33 ` Johannes Weiner
2016-06-06 19:48 ` [PATCH 08/10] mm: deactivations shouldn't bias the LRU balance Johannes Weiner
2016-06-08 8:15 ` Minchan Kim
2016-06-08 12:57 ` Michal Hocko
2016-06-06 19:48 ` [PATCH 09/10] mm: only count actual rotations as LRU reclaim cost Johannes Weiner
2016-06-08 8:19 ` Minchan Kim
2016-06-08 13:18 ` Michal Hocko
2016-06-06 19:48 ` [PATCH 10/10] mm: balance LRU lists based on relative thrashing Johannes Weiner
2016-06-06 19:22 ` kbuild test robot
2016-06-06 23:50 ` Tim Chen
2016-06-07 16:23 ` Johannes Weiner
2016-06-07 19:56 ` Tim Chen
2016-06-08 13:58 ` Michal Hocko
2016-06-10 2:19 ` Minchan Kim
2016-06-13 15:52 ` Johannes Weiner
2016-06-15 2:23 ` Minchan Kim
2016-06-16 15:12 ` Johannes Weiner
2016-06-17 7:49 ` Minchan Kim
2016-06-17 17:01 ` Johannes Weiner
2016-06-20 7:42 ` Minchan Kim
2016-06-22 21:56 ` Johannes Weiner
2016-06-24 6:22 ` Minchan Kim
2016-06-07 9:51 ` [PATCH 00/10] " Michal Hocko
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