From: Andi Kleen <andi@firstfloor.org>
To: Michal Hocko <mhocko@kernel.org>
Cc: Tim Chen <tim.c.chen@linux.intel.com>,
Andrew Morton <akpm@linux-foundation.org>,
Vladimir Davydov <vdavydov@virtuozzo.com>,
Johannes Weiner <hannes@cmpxchg.org>,
Minchan Kim <minchan@kernel.org>, Hugh Dickins <hughd@google.com>,
"Kirill A.Shutemov" <kirill.shutemov@linux.intel.com>,
Andi Kleen <andi@firstfloor.org>, Aaron Lu <aaron.lu@intel.com>,
Huang Ying <ying.huang@intel.com>, linux-mm <linux-mm@kvack.org>,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH 0/7] mm: Improve swap path scalability with batched operations
Date: Wed, 4 May 2016 14:05:39 -0700 [thread overview]
Message-ID: <20160504210539.GM13997@two.firstfloor.org> (raw)
In-Reply-To: <20160504194901.GG21490@dhcp22.suse.cz>
> In order this to work other quite intrusive changes to the current
> reclaim decisions would have to be made though. This is what I tried to
> say. Look at get_scan_count() on how we are making many steps to ignore
> swappiness or prefer the page cache. Even when we make swapout scale it
> won't help much if we do not swap out that often. That's why I claim
But if you made swapout to scale you would need some equivalent
of Tim's patches for the swap path... So you need them in case.
> that we really should think more long term and maybe reconsider these
> decisions which were based on the rotating rust for the swap devices.
Sure that makes sense, but why not start with low hanging fruit
in basic performance, like Tim did? Usually that is how Linux
changes work, steady evolution, not revolution.
-Andi
--
ak@linux.intel.com -- Speaking for myself only.
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next prev parent reply other threads:[~2016-05-04 21:05 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <cover.1462306228.git.tim.c.chen@linux.intel.com>
2016-05-03 21:00 ` [PATCH 0/7] mm: Improve swap path scalability with batched operations Tim Chen
2016-05-04 12:45 ` Michal Hocko
2016-05-04 17:13 ` Tim Chen
2016-05-04 19:49 ` Michal Hocko
2016-05-04 21:05 ` Andi Kleen [this message]
2016-05-04 21:25 ` Johannes Weiner
2016-05-05 0:08 ` Minchan Kim
2016-05-05 7:49 ` Michal Hocko
2016-05-05 15:56 ` Tim Chen
2016-05-03 21:01 ` [PATCH 1/7] mm: Cleanup - Reorganize the shrink_page_list code into smaller functions Tim Chen
2016-05-27 16:40 ` Tim Chen
2016-05-30 8:48 ` Michal Hocko
2016-05-03 21:01 ` [PATCH 2/7] mm: Group the processing of anonymous pages to be swapped in shrink_page_list Tim Chen
2016-05-03 21:02 ` [PATCH 3/7] mm: Add new functions to allocate swap slots in batches Tim Chen
2016-05-03 21:02 ` [PATCH 4/7] mm: Shrink page list batch allocates swap slots for page swapping Tim Chen
2016-05-03 21:02 ` [PATCH 5/7] mm: Batch addtion of pages to swap cache Tim Chen
2016-05-03 21:03 ` [PATCH 6/7] mm: Cleanup - Reorganize code to group handling of page Tim Chen
2016-05-03 21:03 ` [PATCH 7/7] mm: Batch unmapping of pages that are in swap cache Tim Chen
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