From: Alex Shi <alex.shi-KPsoFbNs7GizrGE5bRqYAgC/G2K4zDHf@public.gmane.org>
To: Andrew Morton <akpm-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org>
Cc: cgroups-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
mgorman-3eNAlZScCAx27rWaFMvyedHuzzzSOjJt@public.gmane.org,
tj-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org,
hughd-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org,
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daniel.m.jordan-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org,
yang.shi-KPsoFbNs7GizrGE5bRqYAgC/G2K4zDHf@public.gmane.org,
willy-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org,
hannes-druUgvl0LCNAfugRpC6u6w@public.gmane.org,
lkp-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org,
Michal Hocko <mhocko-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>,
Vladimir Davydov
<vdavydov.dev-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>,
linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
linux-mm-Bw31MaZKKs3YtjvyW6yDsg@public.gmane.org
Subject: Re: [PATCH v9 07/20] mm/lru: introduce TestClearPageLRU
Date: Tue, 3 Mar 2020 12:11:34 +0800 [thread overview]
Message-ID: <9cacdc21-9c1f-2a17-05cb-e9cf2959cef5@linux.alibaba.com> (raw)
In-Reply-To: <20200302141144.b30abe0d89306fd387e13a92-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org>
ÔÚ 2020/3/3 ÉÏÎç6:11, Andrew Morton дµÀ:
>> - if (PageLRU(page)) {
>> + if (TestClearPageLRU(page)) {
>> lruvec = mem_cgroup_page_lruvec(page, pgdat);
>> - ClearPageLRU(page);
>> del_page_from_lru_list(page, lruvec, page_lru(page));
>> } else
>
> The code will now get exclusive access of the page->flags cacheline and
> will dirty that cacheline, even for !PageLRU() pages. What is the
> performance impact of this?
>
Hi Andrew,
Thanks a lot for comments!
I was tested the whole patchset with fengguang's case-lru-file-readtwice
https://git.kernel.org/pub/scm/linux/kernel/git/wfg/vm-scalability.git/
which is most sensitive case on PageLRU I found. There are no clear performance
drop.
On this single patch, I just test the same case again, there is still no perf
drop. some data is here on my 96 threads machine:
no lock_dep w lock_dep and few other debug option
w this patch, 50.96MB/s 32.93MB/s
w/o this patch, 50.50MB/s 33.53MB/s
And also no any warning from Intel 0day yet.
Thanks a lot!
Alex
next prev parent reply other threads:[~2020-03-03 4:11 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-02 11:00 [PATCH v9 00/21] per lruvec lru_lock for memcg Alex Shi
2020-03-02 11:00 ` [PATCH v9 01/20] mm/vmscan: remove unnecessary lruvec adding Alex Shi
2020-03-02 11:00 ` [PATCH v9 02/20] mm/memcg: fold lock_page_lru into commit_charge Alex Shi
2020-03-02 11:00 ` [PATCH v9 04/20] mm/thp: move lru_add_page_tail func to huge_memory.c Alex Shi
2020-03-04 7:47 ` Kirill A. Shutemov
2020-03-04 8:13 ` Alex Shi
2020-03-02 11:00 ` [PATCH v9 06/20] mm/thp: narrow lru locking Alex Shi
[not found] ` <1583146830-169516-7-git-send-email-alex.shi-KPsoFbNs7GizrGE5bRqYAgC/G2K4zDHf@public.gmane.org>
2020-03-04 8:02 ` Kirill A. Shutemov
2020-03-04 8:51 ` Alex Shi
2020-03-02 11:00 ` [PATCH v9 07/20] mm/lru: introduce TestClearPageLRU Alex Shi
2020-03-02 22:11 ` Andrew Morton
[not found] ` <20200302141144.b30abe0d89306fd387e13a92-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org>
2020-03-03 4:11 ` Alex Shi [this message]
[not found] ` <9cacdc21-9c1f-2a17-05cb-e9cf2959cef5-KPsoFbNs7GizrGE5bRqYAgC/G2K4zDHf@public.gmane.org>
2020-03-04 0:46 ` Andrew Morton
[not found] ` <20200303164659.b3a30ab9d68c9ed82299a29c-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org>
2020-03-04 7:06 ` Alex Shi
[not found] ` <6d155f79-8ba2-b322-4e92-311e7be98f79-KPsoFbNs7GizrGE5bRqYAgC/G2K4zDHf@public.gmane.org>
2020-03-04 9:03 ` Rong Chen
2020-03-04 9:37 ` Alex Shi
2020-03-02 11:00 ` [PATCH v9 08/20] mm/lru: add page isolation precondition in __isolate_lru_page Alex Shi
2020-03-02 11:00 ` [PATCH v9 10/20] mm/lru: take PageLRU first in moving page between lru lists Alex Shi
[not found] ` <1583146830-169516-1-git-send-email-alex.shi-KPsoFbNs7GizrGE5bRqYAgC/G2K4zDHf@public.gmane.org>
2020-03-02 11:00 ` [PATCH v9 03/20] mm/page_idle: no unlikely double check for idle page counting Alex Shi
2020-03-02 11:00 ` [PATCH v9 05/20] mm/thp: clean up lru_add_page_tail Alex Shi
2020-03-02 11:00 ` [PATCH v9 09/20] mm/mlock: ClearPageLRU before get lru lock in munlock page isolation Alex Shi
2020-03-02 11:00 ` [PATCH v9 11/20] mm/memcg: move SetPageLRU out of lru_lock in commit_charge Alex Shi
2020-03-02 11:00 ` [PATCH v9 13/20] mm/lru: replace pgdat lru_lock with lruvec lock Alex Shi
2020-03-02 11:00 ` [PATCH v9 14/20] mm/lru: introduce the relock_page_lruvec function Alex Shi
2020-03-02 11:00 ` [PATCH v9 15/20] mm/mlock: optimize munlock_pagevec by relocking Alex Shi
2020-03-02 11:00 ` [PATCH v9 16/20] mm/swap: only change the lru_lock iff page's lruvec is different Alex Shi
2020-03-02 11:00 ` [PATCH v9 18/20] mm/lru: revise the comments of lru_lock Alex Shi
2020-03-02 22:12 ` [PATCH v9 00/21] per lruvec lru_lock for memcg Andrew Morton
[not found] ` <20200302141202.91d88e8b730b194a8bd8fa7d-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org>
2020-03-03 9:32 ` Alex Shi
[not found] ` <59634b5f-b1b2-3b1d-d845-fd15565fcad4-KPsoFbNs7GizrGE5bRqYAgC/G2K4zDHf@public.gmane.org>
2020-03-06 2:15 ` Hugh Dickins
2020-03-02 11:00 ` [PATCH v9 12/20] mm/mlock: clean up __munlock_isolate_lru_page Alex Shi
2020-03-02 11:00 ` [PATCH v9 17/20] mm/pgdat: remove pgdat lru_lock Alex Shi
2020-03-02 11:00 ` [PATCH v9 19/20] mm/lru: add debug checking for page memcg moving Alex Shi
2020-03-02 11:00 ` [PATCH v9 20/20] mm/memcg: add debug checking in lock_page_memcg Alex Shi
[not found] ` <20200304031335.9784-1-hdanton@sina.com>
2020-03-04 7:19 ` [PATCH v9 02/20] mm/memcg: fold lock_page_lru into commit_charge Alex Shi
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