linux-kernel - Re: [PATCH 3/3] mm: add vmstat statistics for madvise

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Message-ID: <Y8e30ujUGLwDfes8@dhcp22.suse.cz>
Date:   Wed, 18 Jan 2023 10:11:46 +0100
From:   Michal Hocko <mhocko@...e.com>
To:     Minchan Kim <minchan@...nel.org>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Suren Baghdasaryan <surenb@...gle.com>,
        Matthew Wilcox <willy@...radead.org>,
        linux-mm <linux-mm@...ck.org>,
        LKML <linux-kernel@...r.kernel.org>,
        SeongJae Park <sj@...nel.org>
Subject: Re: [PATCH 3/3] mm: add vmstat statistics for madvise_[cold|pageout]

On Tue 17-01-23 15:16:32, Minchan Kim wrote:
> madvise LRU manipulation APIs need to scan address ranges to find
> present pages at page table and provides advice hints for them.
> 
> Likewise pg[scan/steal] count on vmstat, madvise_pg[scanned/hinted]
> shows the proactive reclaim efficiency so this patch addes those
> two statistics in vmstat.

Please describe the usecase for those new counters.
-- 
Michal Hocko
SUSE Labs