From: Rik van Riel <riel@redhat.com>
To: Shaohua Li <shli@kernel.org>, "Huang, Ying" <ying.huang@intel.com>
Cc: Andrew Morton <akpm@linux-foundation.org>,
tim.c.chen@intel.com, dave.hansen@intel.com,
andi.kleen@intel.com, aaron.lu@intel.com, linux-mm@kvack.org,
linux-kernel@vger.kernel.org, Hugh Dickins <hughd@google.com>,
Minchan Kim <minchan@kernel.org>,
Andrea Arcangeli <aarcange@redhat.com>,
"Kirill A . Shutemov" <kirill.shutemov@linux.intel.com>,
Vladimir Davydov <vdavydov@virtuozzo.com>,
Johannes Weiner <hannes@cmpxchg.org>,
Michal Hocko <mhocko@kernel.org>
Subject: Re: [PATCH -v3 00/10] THP swap: Delay splitting THP during swapping out
Date: Thu, 22 Sep 2016 20:38:06 -0400 [thread overview]
Message-ID: <1474591086.17726.1.camel@redhat.com> (raw)
In-Reply-To: <20160922225608.GA3898@kernel.org>
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On Thu, 2016-09-22 at 15:56 -0700, Shaohua Li wrote:
> On Wed, Sep 07, 2016 at 09:45:59AM -0700, Huang, Ying wrote:
> >
> > - It will help the memory fragmentation, especially when the THP is
> > heavily used by the applications. The 2M continuous pages will
> > be
> > free up after THP swapping out.
>
> So this is impossible without THP swapin. While 2M swapout makes a
> lot of
> sense, I doubt 2M swapin is really useful. What kind of application
> is
> 'optimized' to do sequential memory access?
I suspect a lot of this will depend on the ratio of storage
speed to CPU & RAM speed.
When swapping to a spinning disk, it makes sense to avoid
extra memory use on swapin, and work in 4kB blocks.
When swapping to NVRAM, it makes sense to use 2MB blocks,
because that storage can handle data faster than we can
manage 4kB pages in the VM.
--
All Rights Reversed.
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next prev parent reply other threads:[~2016-09-23 0:38 UTC|newest]
Thread overview: 61+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-09-07 16:45 Huang, Ying
2016-09-07 16:46 ` [PATCH -v3 01/10] mm, swap: Make swap cluster size same of THP size on x86_64 Huang, Ying
2016-09-08 5:45 ` Anshuman Khandual
2016-09-08 18:07 ` Huang, Ying
2016-09-19 17:09 ` Johannes Weiner
2016-09-20 2:01 ` Huang, Ying
2016-09-22 19:25 ` Johannes Weiner
2016-09-23 8:47 ` Huang, Ying
2016-09-08 8:21 ` Anshuman Khandual
2016-09-08 11:03 ` Kirill A. Shutemov
2016-09-08 17:39 ` Huang, Ying
2016-09-08 11:07 ` Kirill A. Shutemov
2016-09-08 17:23 ` Huang, Ying
2016-09-07 16:46 ` [PATCH -v3 02/10] mm, memcg: Add swap_cgroup_iter iterator Huang, Ying
2016-09-07 16:46 ` [PATCH -v3 03/10] mm, memcg: Support to charge/uncharge multiple swap entries Huang, Ying
2016-09-08 5:46 ` Anshuman Khandual
2016-09-08 8:28 ` Anshuman Khandual
2016-09-08 18:15 ` Huang, Ying
2016-09-07 16:46 ` [PATCH -v3 04/10] mm, THP, swap: Add swap cluster allocate/free functions Huang, Ying
2016-09-08 5:49 ` Anshuman Khandual
2016-09-08 8:30 ` Anshuman Khandual
2016-09-08 18:14 ` Huang, Ying
2016-09-07 16:46 ` [PATCH -v3 05/10] mm, THP, swap: Add get_huge_swap_page() Huang, Ying
2016-09-08 11:13 ` Kirill A. Shutemov
2016-09-08 17:22 ` Huang, Ying
2016-09-07 16:46 ` [PATCH -v3 06/10] mm, THP, swap: Support to clear SWAP_HAS_CACHE for huge page Huang, Ying
2016-09-07 16:46 ` [PATCH -v3 07/10] mm, THP, swap: Support to add/delete THP to/from swap cache Huang, Ying
2016-09-08 9:00 ` Anshuman Khandual
2016-09-08 18:10 ` Huang, Ying
2016-09-07 16:46 ` [PATCH -v3 08/10] mm, THP: Add can_split_huge_page() Huang, Ying
2016-09-08 11:17 ` Kirill A. Shutemov
2016-09-08 17:02 ` Huang, Ying
2016-09-07 16:46 ` [PATCH -v3 09/10] mm, THP, swap: Support to split THP in swap cache Huang, Ying
2016-09-07 16:46 ` [PATCH -v3 10/10] mm, THP, swap: Delay splitting THP during swap out Huang, Ying
2016-09-09 5:43 ` [PATCH -v3 00/10] THP swap: Delay splitting THP during swapping out Minchan Kim
2016-09-09 15:53 ` Tim Chen
2016-09-09 20:35 ` Huang, Ying
2016-09-13 6:13 ` Minchan Kim
2016-09-13 6:40 ` Huang, Ying
2016-09-13 7:05 ` Minchan Kim
2016-09-13 8:53 ` Huang, Ying
2016-09-13 9:16 ` Minchan Kim
2016-09-13 23:52 ` Chen, Tim C
2016-09-19 7:11 ` Minchan Kim
2016-09-19 15:59 ` Tim Chen
2016-09-18 1:53 ` Huang, Ying
2016-09-19 7:08 ` Minchan Kim
2016-09-20 2:54 ` Huang, Ying
2016-09-20 5:06 ` Minchan Kim
2016-09-20 5:28 ` Huang, Ying
2016-09-13 14:35 ` Andrea Arcangeli
2016-09-19 17:33 ` Hugh Dickins
2016-09-22 22:56 ` Shaohua Li
2016-09-22 23:49 ` Chen, Tim C
2016-09-22 23:53 ` Andi Kleen
2016-09-23 0:38 ` Rik van Riel [this message]
2016-09-23 2:32 ` Huang, Ying
2016-09-25 19:18 ` Shaohua Li
2016-09-26 1:06 ` Minchan Kim
2016-09-26 3:25 ` Huang, Ying
2016-09-23 2:12 ` Huang, Ying
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