From: Dave Hansen <dave.hansen@intel.com>
To: Yu Zhao <yuzhao@google.com>
Cc: linux-mm@kvack.org, Alex Shi <alex.shi@linux.alibaba.com>,
Andrew Morton <akpm@linux-foundation.org>,
Dave Hansen <dave.hansen@linux.intel.com>,
Hillf Danton <hdanton@sina.com>,
Johannes Weiner <hannes@cmpxchg.org>,
Joonsoo Kim <iamjoonsoo.kim@lge.com>,
Matthew Wilcox <willy@infradead.org>,
Mel Gorman <mgorman@suse.de>, Michal Hocko <mhocko@suse.com>,
Roman Gushchin <guro@fb.com>, Vlastimil Babka <vbabka@suse.cz>,
Wei Yang <richard.weiyang@linux.alibaba.com>,
Yang Shi <shy828301@gmail.com>, Ying Huang <ying.huang@intel.com>,
linux-kernel@vger.kernel.org, page-reclaim@google.com
Subject: Re: [PATCH v1 00/14] Multigenerational LRU
Date: Tue, 16 Mar 2021 14:14:43 -0700 [thread overview]
Message-ID: <4e76078c-846f-a0f0-2349-12d9d806d1a8@intel.com> (raw)
In-Reply-To: <YFEVaZvsVt7nfhdM@google.com>
On 3/16/21 1:30 PM, Yu Zhao wrote:
> On Tue, Mar 16, 2021 at 07:50:23AM -0700, Dave Hansen wrote:
>> I think it would also be very worthwhile to include some research in
>> this series about why the kernel moved away from page table scanning.
>> What has changed? Are the workloads we were concerned about way back
>> then not around any more? Has faster I/O or larger memory sizes with a
>> stagnating page size changed something?
>
> Sure. Hugh also suggested this too but I personally found that ancient
> pre-2.4 history too irrelevant (and uninteresting) to the modern age
> and decided to spare audience of the boredom.
IIRC, rmap chains showed up in the 2.5 era and the VM was quite bumpy
until anon_vmas came around, which was early-ish in the 2.6 era.
But, either way, I think there is a sufficient population of nostalgic
crusty old folks around to warrant a bit of a history lesson. We'll
enjoy the trip down memory lane, fondly remembering the old days in
Ottawa...
>>> nr_vmscan_write 24900719
>>> nr_vmscan_immediate_reclaim 115535
>>> pgscan_kswapd 320831544
>>> pgscan_direct 23396383
>>> pgscan_direct_throttle 0
>>> pgscan_anon 127491077
>>> pgscan_file 216736850
>>> slabs_scanned 400469680
>>> compact_migrate_scanned 1092813949
>>> compact_free_scanned 4919523035
>>> compact_daemon_migrate_scanned 2372223
>>> compact_daemon_free_scanned 20989310
>>> unevictable_pgs_scanned 307388545
>
> 10G swap + 8G anon rss + 6G file rss, hmm... an interesting workload.
> The file rss does seem a bit high to me, my wild speculation is there
> have been git/make activities in addition to a VM?
I wish I was doing more git/make activities. It's been an annoying
amount of email and web browsers for 12 days. If anything, I'd suspect
that Thunderbird is at fault for keeping a bunch of mail in the page
cache. There are a couple of VM's running though.
next prev parent reply other threads:[~2021-03-16 21:15 UTC|newest]
Thread overview: 55+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-13 7:57 [PATCH v1 00/14] Multigenerational LRU Yu Zhao
2021-03-13 7:57 ` [PATCH v1 01/14] include/linux/memcontrol.h: do not warn in page_memcg_rcu() if !CONFIG_MEMCG Yu Zhao
2021-03-13 15:09 ` Matthew Wilcox
2021-03-14 7:45 ` Yu Zhao
2021-03-13 7:57 ` [PATCH v1 02/14] include/linux/nodemask.h: define next_memory_node() if !CONFIG_NUMA Yu Zhao
2021-03-13 7:57 ` [PATCH v1 03/14] include/linux/huge_mm.h: define is_huge_zero_pmd() if !CONFIG_TRANSPARENT_HUGEPAGE Yu Zhao
2021-03-13 7:57 ` [PATCH v1 04/14] include/linux/cgroup.h: export cgroup_mutex Yu Zhao
2021-03-13 7:57 ` [PATCH v1 05/14] mm/swap.c: export activate_page() Yu Zhao
2021-03-13 7:57 ` [PATCH v1 06/14] mm, x86: support the access bit on non-leaf PMD entries Yu Zhao
2021-03-14 22:12 ` Zi Yan
2021-03-14 22:51 ` Matthew Wilcox
2021-03-15 0:03 ` Yu Zhao
2021-03-15 0:27 ` Zi Yan
2021-03-15 1:04 ` Yu Zhao
2021-03-14 23:22 ` Dave Hansen
2021-03-15 3:16 ` Yu Zhao
2021-03-13 7:57 ` [PATCH v1 07/14] mm/pagewalk.c: add pud_entry_post() for post-order traversals Yu Zhao
2021-03-13 7:57 ` [PATCH v1 08/14] mm/vmscan.c: refactor shrink_node() Yu Zhao
2021-03-13 7:57 ` [PATCH v1 09/14] mm: multigenerational lru: mm_struct list Yu Zhao
2021-03-15 19:40 ` Rik van Riel
2021-03-16 2:07 ` Huang, Ying
2021-03-16 3:57 ` Yu Zhao
2021-03-16 6:44 ` Huang, Ying
2021-03-16 7:56 ` Yu Zhao
2021-03-17 3:37 ` Huang, Ying
2021-03-17 10:46 ` Yu Zhao
2021-03-22 3:13 ` Huang, Ying
2021-03-22 8:08 ` Yu Zhao
2021-03-24 6:58 ` Huang, Ying
2021-04-10 18:48 ` Yu Zhao
2021-04-13 3:06 ` Huang, Ying
2021-03-13 7:57 ` [PATCH v1 10/14] mm: multigenerational lru: core Yu Zhao
2021-03-15 2:02 ` Andi Kleen
2021-03-15 3:37 ` Yu Zhao
2021-03-13 7:57 ` [PATCH v1 11/14] mm: multigenerational lru: page activation Yu Zhao
2021-03-16 16:34 ` Matthew Wilcox
2021-03-16 21:29 ` Yu Zhao
2021-03-13 7:57 ` [PATCH v1 12/14] mm: multigenerational lru: user space interface Yu Zhao
2021-03-13 7:57 ` [PATCH v1 13/14] mm: multigenerational lru: Kconfig Yu Zhao
2021-03-13 7:57 ` [PATCH v1 14/14] mm: multigenerational lru: documentation Yu Zhao
2021-03-19 9:31 ` Alex Shi
2021-03-22 6:09 ` Yu Zhao
2021-03-14 22:48 ` [PATCH v1 00/14] Multigenerational LRU Zi Yan
2021-03-15 0:52 ` Yu Zhao
[not found] ` <20210315011350.3648-1-hdanton@sina.com>
2021-03-15 6:49 ` Yu Zhao
2021-03-15 18:00 ` Dave Hansen
2021-03-16 2:24 ` Yu Zhao
2021-03-16 14:50 ` Dave Hansen
2021-03-16 20:30 ` Yu Zhao
2021-03-16 21:14 ` Dave Hansen [this message]
2021-04-10 9:21 ` Yu Zhao
2021-04-13 3:02 ` Huang, Ying
2021-04-13 23:00 ` Yu Zhao
2021-03-15 18:38 ` Yang Shi
2021-03-16 3:38 ` Yu Zhao
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=4e76078c-846f-a0f0-2349-12d9d806d1a8@intel.com \
--to=dave.hansen@intel.com \
--cc=akpm@linux-foundation.org \
--cc=alex.shi@linux.alibaba.com \
--cc=dave.hansen@linux.intel.com \
--cc=guro@fb.com \
--cc=hannes@cmpxchg.org \
--cc=hdanton@sina.com \
--cc=iamjoonsoo.kim@lge.com \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mm@kvack.org \
--cc=mgorman@suse.de \
--cc=mhocko@suse.com \
--cc=page-reclaim@google.com \
--cc=richard.weiyang@linux.alibaba.com \
--cc=shy828301@gmail.com \
--cc=vbabka@suse.cz \
--cc=willy@infradead.org \
--cc=ying.huang@intel.com \
--cc=yuzhao@google.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).