From: "Huang, Ying" <ying.huang@intel.com>
To: Michal Hocko <mhocko@suse.com>
Cc: Dave Hansen <dave.hansen@intel.com>,
Dave Hansen <dave.hansen@linux.intel.com>,
linux-mm@kvack.org, linux-kernel@vger.kernel.org,
yang.shi@linux.alibaba.com, rientjes@google.com,
dan.j.williams@intel.com, david@redhat.com, osalvador@suse.de,
weixugc@google.com
Subject: Re: [PATCH 00/10] [v7][RESEND] Migrate Pages in lieu of discard
Date: Fri, 07 May 2021 14:14:24 +0800 [thread overview]
Message-ID: <87y2crnk8v.fsf@yhuang6-desk1.ccr.corp.intel.com> (raw)
In-Reply-To: <YHmm11fxEnxXAxas@dhcp22.suse.cz> (Michal Hocko's message of "Fri, 16 Apr 2021 17:02:23 +0200")
Hi, Michal,
Michal Hocko <mhocko@suse.com> writes:
[...]
>>
>> > Btw. do you have any numbers from running this with some real work
>> > workload?
>>
>> Yes, quite a bit. Do you have a specific scenario in mind? Folks seem
>> to come at this in two different ways:
>>
>> Some want to know how much DRAM they can replace by buying some PMEM.
>> They tend to care about how much adding the (cheaper) PMEM slows them
>> down versus (expensive) DRAM. They're making a cost-benefit call
>>
>> Others want to repurpose some PMEM they already have. They want to know
>> how much using PMEM in this way will speed them up. They will basically
>> take any speedup they can get.
>>
>> I ask because as a kernel developer with PMEM in my systems, I find the
>> "I'll take what I can get" case more personally appealing. But, the
>> business folks are much more keen on the "DRAM replacement" use. Do you
>> have any thoughts on what you would like to see?
>
> I was thinking about typical large in memory processing (e.g. in memory
> databases) where the hot part of the working set is only a portion and
> spilling over to a slower memory can be still benefitial because IO +
> data preprocessing on cold data is much slower.
We have tested the patchset with the postgresql and pgbench. On a
machine with DRAM and PMEM, the kernel with the patchset can improve the
score of pgbench up to 22.1% compared with that of the DRAM only + disk
case. This comes from the reduced disk read throughput (which reduces
up to 70.8%).
Best Regards,
Huang, Ying
next prev parent reply other threads:[~2021-05-07 6:14 UTC|newest]
Thread overview: 62+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-04-01 18:32 [PATCH 00/10] [v7][RESEND] Migrate Pages in lieu of discard Dave Hansen
2021-04-01 18:32 ` [PATCH 01/10] mm/numa: node demotion data structure and lookup Dave Hansen
2021-04-08 8:03 ` Oscar Salvador
2021-04-08 21:29 ` Dave Hansen
2021-04-09 5:32 ` Wei Xu
2021-04-01 18:32 ` [PATCH 02/10] mm/numa: automatically generate node migration order Dave Hansen
2021-04-08 8:26 ` Oscar Salvador
2021-04-08 21:51 ` Dave Hansen
2021-04-09 8:17 ` Oscar Salvador
2021-04-10 3:07 ` Wei Xu
2021-04-14 8:08 ` Oscar Salvador
2021-04-14 8:11 ` Oscar Salvador
2021-04-14 8:12 ` David Hildenbrand
2021-04-14 8:14 ` Oscar Salvador
2021-04-14 8:20 ` David Hildenbrand
2021-04-15 4:07 ` Wei Xu
2021-04-15 15:35 ` Dave Hansen
2021-04-15 20:25 ` Wei Xu
2021-04-01 18:32 ` [PATCH 03/10] mm/migrate: update node demotion order during on hotplug events Dave Hansen
2021-04-08 9:52 ` Oscar Salvador
2021-04-09 10:14 ` Oscar Salvador
2021-04-09 10:15 ` Oscar Salvador
2021-04-09 18:59 ` David Hildenbrand
2021-04-12 7:19 ` Oscar Salvador
2021-04-12 9:19 ` David Hildenbrand
2021-04-01 18:32 ` [PATCH 04/10] mm/migrate: make migrate_pages() return nr_succeeded Dave Hansen
2021-04-01 22:39 ` Wei Xu
[not found] ` <CAAPL-u-o-M2T25xBtSoipYjUnu+3aJNcJ9uS84yKaAnbrXpefw@mail.gmail.com>
2021-04-01 23:21 ` Dave Hansen
2021-04-08 10:14 ` Oscar Salvador
2021-04-08 17:26 ` Yang Shi
2021-04-08 18:17 ` Oscar Salvador
2021-04-08 18:21 ` Oscar Salvador
2021-04-08 20:40 ` Yang Shi
2021-04-09 5:06 ` Oscar Salvador
2021-04-09 5:43 ` Wei Xu
2021-04-09 15:43 ` Yang Shi
2021-04-09 15:50 ` Dave Hansen
2021-04-09 18:47 ` Wei Xu
2021-04-09 20:10 ` Yang Shi
2021-04-01 18:32 ` [PATCH 05/10] mm/migrate: demote pages during reclaim Dave Hansen
2021-04-01 20:01 ` Yang Shi
2021-04-01 22:58 ` Dave Hansen
2021-04-08 10:47 ` Oscar Salvador
2021-04-10 3:35 ` Wei Xu
2021-04-01 18:32 ` [PATCH 06/10] mm/vmscan: add page demotion counter Dave Hansen
2021-04-10 3:40 ` Wei Xu
2021-04-01 18:32 ` [PATCH 07/10] mm/vmscan: add helper for querying ability to age anonymous pages Dave Hansen
2021-04-07 18:40 ` Wei Xu
2021-04-09 8:31 ` Oscar Salvador
2021-04-01 18:32 ` [PATCH 08/10] mm/vmscan: Consider anonymous pages without swap Dave Hansen
2021-04-02 0:55 ` Wei Xu
2021-04-01 18:32 ` [PATCH 09/10] mm/vmscan: never demote for memcg reclaim Dave Hansen
2021-04-02 0:18 ` Wei Xu
2021-04-01 18:32 ` [PATCH 10/10] mm/migrate: new zone_reclaim_mode to enable reclaim migration Dave Hansen
2021-04-01 20:06 ` Yang Shi
2021-04-10 4:10 ` Wei Xu
2021-04-16 12:35 ` [PATCH 00/10] [v7][RESEND] Migrate Pages in lieu of discard Michal Hocko
2021-04-16 14:26 ` Dave Hansen
2021-04-16 15:02 ` Michal Hocko
2021-04-21 2:39 ` Huang, Ying
2021-05-07 6:14 ` Huang, Ying [this message]
2021-06-11 5:50 ` 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=87y2crnk8v.fsf@yhuang6-desk1.ccr.corp.intel.com \
--to=ying.huang@intel.com \
--cc=dan.j.williams@intel.com \
--cc=dave.hansen@intel.com \
--cc=dave.hansen@linux.intel.com \
--cc=david@redhat.com \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mm@kvack.org \
--cc=mhocko@suse.com \
--cc=osalvador@suse.de \
--cc=rientjes@google.com \
--cc=weixugc@google.com \
--cc=yang.shi@linux.alibaba.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;
as well as URLs for NNTP newsgroup(s).