From: "Chen, Tim C" <tim.c.chen@intel.com>
To: Minchan Kim <minchan@kernel.org>, "Huang, Ying" <ying.huang@intel.com>
Cc: Andrew Morton <akpm@linux-foundation.org>,
"Hansen, Dave" <dave.hansen@intel.com>,
"Kleen, Andi" <andi.kleen@intel.com>,
"Lu, Aaron" <aaron.lu@intel.com>,
"linux-mm@kvack.org" <linux-mm@kvack.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
Hugh Dickins <hughd@google.com>, Shaohua Li <shli@kernel.org>,
Rik van Riel <riel@redhat.com>,
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: Tue, 13 Sep 2016 23:52:27 +0000 [thread overview]
Message-ID: <045D8A5597B93E4EBEDDCBF1FC15F50935BF9343@fmsmsx104.amr.corp.intel.com> (raw)
In-Reply-To: <20160913091652.GB7132@bbox>
>>
>> - Avoid CPU time for splitting, collapsing THP across swap out/in.
>
>Yes, if you want, please give us how bad it is.
>
It could be pretty bad. In an experiment with THP turned on and we
enter swap, 50% of the cpu are spent in the page compaction path.
So if we could deal with units of large page for swap, the splitting
and compaction of ordinary pages to large page overhead could be avoided.
51.89% 51.89% :1688 [kernel.kallsyms] [k] pageblock_pfn_to_page
|
--- pageblock_pfn_to_page
|
|--64.57%-- compaction_alloc
| migrate_pages
| compact_zone
| compact_zone_order
| try_to_compact_pages
| __alloc_pages_direct_compact
| __alloc_pages_nodemask
| alloc_pages_vma
| do_huge_pmd_anonymous_page
| handle_mm_fault
| __do_page_fault
| do_page_fault
| page_fault
| 0x401d9a
|
|--34.62%-- compact_zone
| compact_zone_order
| try_to_compact_pages
| __alloc_pages_direct_compact
| __alloc_pages_nodemask
| alloc_pages_vma
| do_huge_pmd_anonymous_page
| handle_mm_fault
| __do_page_fault
| do_page_fault
| page_fault
| 0x401d9a
--0.81%-- [...]
Tim
--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@kvack.org. For more info on Linux MM,
see: http://www.linux-mm.org/ .
Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>
next prev parent reply other threads:[~2016-09-13 23:52 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 [this message]
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
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
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=045D8A5597B93E4EBEDDCBF1FC15F50935BF9343@fmsmsx104.amr.corp.intel.com \
--to=tim.c.chen@intel.com \
--cc=aarcange@redhat.com \
--cc=aaron.lu@intel.com \
--cc=akpm@linux-foundation.org \
--cc=andi.kleen@intel.com \
--cc=dave.hansen@intel.com \
--cc=hannes@cmpxchg.org \
--cc=hughd@google.com \
--cc=kirill.shutemov@linux.intel.com \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mm@kvack.org \
--cc=mhocko@kernel.org \
--cc=minchan@kernel.org \
--cc=riel@redhat.com \
--cc=shli@kernel.org \
--cc=vdavydov@virtuozzo.com \
--cc=ying.huang@intel.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox