From: Dave Hansen <dave.hansen@intel.com>
To: Zi Yan <ziy@nvidia.com>
Cc: Keith Busch <kbusch@kernel.org>,
Yang Shi <yang.shi@linux.alibaba.com>,
mhocko@suse.com, mgorman@techsingularity.net, riel@surriel.com,
hannes@cmpxchg.org, akpm@linux-foundation.org, "Busch,
Keith" <keith.busch@intel.com>,
"Williams, Dan J" <dan.j.williams@intel.com>,
"Wu, Fengguang" <fengguang.wu@intel.com>,
"Du, Fan" <fan.du@intel.com>,
"Huang, Ying" <ying.huang@intel.com>,
linux-mm@kvack.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 06/10] mm: vmscan: demote anon DRAM pages to PMEM node
Date: Wed, 27 Mar 2019 11:00:32 -0700 [thread overview]
Message-ID: <3fd20a95-7f2d-f395-73f6-21561eae9912@intel.com> (raw)
In-Reply-To: <33FCCD53-4A4D-4115-9AC3-6C35A300169F@nvidia.com>
On 3/27/19 10:48 AM, Zi Yan wrote:
> For 40MB/s vs 750MB/s, they were using sys_migrate_pages(). Sorry
> about the confusion there. As I measure only the migrate_pages() in
> the kernel, the throughput becomes: migrating 4KB page: 0.312GB/s
> vs migrating 512 4KB pages: 0.854GB/s. They are still >2x
> difference.
>
> Furthermore, if we only consider the migrate_page_copy() in
> mm/migrate.c, which only calls copy_highpage() and
> migrate_page_states(), the throughput becomes: migrating 4KB page:
> 1.385GB/s vs migrating 512 4KB pages: 1.983GB/s. The gap is
> smaller, but migrating 512 4KB pages still achieves 40% more
> throughput.
>
> Do these numbers make sense to you?
Yes. It would be very interesting to batch the migrations in the
kernel and see how it affects the code. A 50% boost is interesting,
but not if it's only in microbenchmarks and takes 2k lines of code.
50% is *very* interesting if it happens in the real world and we can
do it in 10 lines of code.
So, let's see what the code looks like.
next prev parent reply other threads:[~2019-03-27 18:00 UTC|newest]
Thread overview: 58+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-03-23 4:44 [RFC PATCH 0/10] Another Approach to Use PMEM as NUMA Node Yang Shi
2019-03-23 4:44 ` [PATCH 01/10] mm: control memory placement by nodemask for two tier main memory Yang Shi
2019-03-23 17:21 ` Dan Williams
2019-03-25 19:28 ` Yang Shi
2019-03-25 23:18 ` Dan Williams
2019-03-25 23:36 ` Yang Shi
2019-03-25 23:42 ` Dan Williams
2019-03-23 4:44 ` [PATCH 02/10] mm: mempolicy: introduce MPOL_HYBRID policy Yang Shi
2019-03-23 4:44 ` [PATCH 03/10] mm: mempolicy: promote page to DRAM for MPOL_HYBRID Yang Shi
2019-03-23 4:44 ` [PATCH 04/10] mm: numa: promote pages to DRAM when it is accessed twice Yang Shi
2019-03-29 0:31 ` kbuild test robot
2019-03-23 4:44 ` [PATCH 05/10] mm: page_alloc: make find_next_best_node could skip DRAM node Yang Shi
2019-03-23 4:44 ` [PATCH 06/10] mm: vmscan: demote anon DRAM pages to PMEM node Yang Shi
2019-03-23 6:03 ` Zi Yan
2019-03-25 21:49 ` Yang Shi
2019-03-24 22:20 ` Keith Busch
2019-03-25 19:49 ` Yang Shi
2019-03-27 0:35 ` Keith Busch
2019-03-27 3:41 ` Yang Shi
2019-03-27 13:08 ` Keith Busch
2019-03-27 17:00 ` Zi Yan
2019-03-27 17:05 ` Dave Hansen
2019-03-27 17:48 ` Zi Yan
2019-03-27 18:00 ` Dave Hansen [this message]
2019-03-27 20:37 ` Zi Yan
2019-03-27 20:42 ` Dave Hansen
2019-03-28 21:59 ` Yang Shi
2019-03-28 22:45 ` Keith Busch
2019-03-23 4:44 ` [PATCH 07/10] mm: vmscan: add page demotion counter Yang Shi
2019-03-23 4:44 ` [PATCH 08/10] mm: numa: add page promotion counter Yang Shi
2019-03-23 4:44 ` [PATCH 09/10] doc: add description for MPOL_HYBRID mode Yang Shi
2019-03-23 4:44 ` [PATCH 10/10] doc: elaborate the PMEM allocation rule Yang Shi
2019-03-25 16:15 ` [RFC PATCH 0/10] Another Approach to Use PMEM as NUMA Node Brice Goglin
2019-03-25 16:56 ` Dan Williams
2019-03-25 17:45 ` Brice Goglin
2019-03-25 19:29 ` Dan Williams
2019-03-25 23:09 ` Brice Goglin
2019-03-25 23:37 ` Dan Williams
2019-03-26 12:19 ` Jonathan Cameron
2019-03-25 20:04 ` Yang Shi
2019-03-26 13:58 ` Michal Hocko
2019-03-26 18:33 ` Yang Shi
2019-03-26 18:37 ` Michal Hocko
2019-03-27 2:58 ` Yang Shi
2019-03-27 9:01 ` Michal Hocko
2019-03-27 17:34 ` Dan Williams
2019-03-27 18:59 ` Yang Shi
2019-03-27 20:09 ` Michal Hocko
2019-03-28 2:09 ` Yang Shi
2019-03-28 6:58 ` Michal Hocko
2019-03-28 18:58 ` Yang Shi
2019-03-28 19:12 ` Michal Hocko
2019-03-28 19:40 ` Yang Shi
2019-03-28 20:40 ` Michal Hocko
2019-03-28 8:21 ` Dan Williams
2019-03-27 20:14 ` Dave Hansen
2019-03-27 20:35 ` Matthew Wilcox
2019-03-27 20:40 ` Dave Hansen
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