Re: [PATCH v2] mm: exclude isolated non-lru pages from NR_ISOLATED_ANON or NR_ISOLATED_FILE.

From	Michal Hocko <mhocko@kernel.org>
Newsgroups	linux.kernel
Subject	Re: [PATCH v2] mm: exclude isolated non-lru pages from NR_ISOLATED_ANON or NR_ISOLATED_FILE.
Date	2016-10-14 16:00 +0200
Message-ID	<ssbbI-1Xc-9@gated-at.bofh.it> (permalink)
References	<srI01-8rc-1@gated-at.bofh.it> <srJyO-120-13@gated-at.bofh.it> <ss6c2-7kv-31@gated-at.bofh.it> <ss90e-G6-3@gated-at.bofh.it> <ssb21-1TI-17@gated-at.bofh.it>
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On Fri 14-10-16 22:46:04, Minchan Kim wrote:
[...]
> > > > Why don't you simply mimic what shrink_inactive_list does? Aka count the
> > > > number of isolated pages and then account them when appropriate?
> > > >
> > > I think i am correcting clearly wrong part. So, there is no need to
> > > describe it too detailed. It's a misunderstanding, and i will add
> > > more comments as you suggest.
> > 
> > OK, so could you explain why you prefer to relyon __PageMovable rather
> > than do a trivial counting during the isolation?
> 
> I don't get it. Could you elaborate it a bit more?

It is really simple. You can count the number of file and anonymous
pages while they are isolated and then account them to NR_ISOLATED_*
later. Basically the same thing we do during the reclaim. We absolutely
do not have to rely on __PageMovable and make this code more complex
than necessary.
-- 
Michal Hocko
SUSE Labs

Thread

[PATCH v2] mm: exclude isolated non-lru pages from NR_ISOLATED_ANON or NR_ISOLATED_FILE. "ming.ling" <ming.ling@spreadtrum.com> - 2016-10-13 08:50 +0200
  Re: [PATCH v2] mm: exclude isolated non-lru pages from  NR_ISOLATED_ANON or NR_ISOLATED_FILE. Michal Hocko <mhocko@kernel.org> - 2016-10-13 10:30 +0200
    Re: [PATCH v2] mm: exclude isolated non-lru pages from  NR_ISOLATED_ANON or NR_ISOLATED_FILE. Ming Ling <ming.ling@spreadtrum.com> - 2016-10-14 10:40 +0200
      Re: [PATCH v2] mm: exclude isolated non-lru pages from  NR_ISOLATED_ANON or NR_ISOLATED_FILE. Michal Hocko <mhocko@kernel.org> - 2016-10-14 13:40 +0200
        Re: [PATCH v2] mm: exclude isolated non-lru pages from  NR_ISOLATED_ANON or NR_ISOLATED_FILE. Minchan Kim <minchan@kernel.org> - 2016-10-14 15:50 +0200
          Re: [PATCH v2] mm: exclude isolated non-lru pages from  NR_ISOLATED_ANON or NR_ISOLATED_FILE. Michal Hocko <mhocko@kernel.org> - 2016-10-14 16:00 +0200
            Re: [PATCH v2] mm: exclude isolated non-lru pages from  NR_ISOLATED_ANON or NR_ISOLATED_FILE. Minchan Kim <minchan@kernel.org> - 2016-10-14 16:50 +0200
              Re: [PATCH v2] mm: exclude isolated non-lru pages from  NR_ISOLATED_ANON or NR_ISOLATED_FILE. Michal Hocko <mhocko@kernel.org> - 2016-10-14 17:10 +0200
                Re: [PATCH v2] mm: exclude isolated non-lru pages from  NR_ISOLATED_ANON or NR_ISOLATED_FILE. Minchan Kim <minchan@kernel.org> - 2016-10-14 17:30 +0200
                Re: [PATCH v2] mm: exclude isolated non-lru pages from  NR_ISOLATED_ANON or NR_ISOLATED_FILE. Michal Hocko <mhocko@kernel.org> - 2016-10-15 09:30 +0200
                Re: [PATCH v2] mm: exclude isolated non-lru pages from  NR_ISOLATED_ANON or NR_ISOLATED_FILE. Minchan Kim <minchan@kernel.org> - 2016-10-17 01:10 +0200
                Re: [PATCH v2] mm: exclude isolated non-lru pages from  NR_ISOLATED_ANON or NR_ISOLATED_FILE. Michal Hocko <mhocko@kernel.org> - 2016-10-17 10:50 +0200
                Re: [PATCH v2] mm: exclude isolated non-lru pages from  NR_ISOLATED_ANON or NR_ISOLATED_FILE. Michal Hocko <mhocko@kernel.org> - 2016-10-17 13:20 +0200
                Re: [PATCH v2] mm: exclude isolated non-lru pages from  NR_ISOLATED_ANON or NR_ISOLATED_FILE. Minchan Kim <minchan@kernel.org> - 2016-10-18 08:40 +0200
                Re: [PATCH v2] mm: exclude isolated non-lru pages from  NR_ISOLATED_ANON or NR_ISOLATED_FILE. Michal Hocko <mhocko@kernel.org> - 2016-10-18 15:00 +0200
                Re: [PATCH v2] mm: exclude isolated non-lru pages from  NR_ISOLATED_ANON or NR_ISOLATED_FILE. Ming Ling <ming.ling@spreadtrum.com> - 2016-10-19 04:40 +0200

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