linux-kernel - Re: [PATCH] mm: don't show nr_indirectly

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Message-ID: <20180425210143.GA10277@castle>
Date:   Wed, 25 Apr 2018 22:01:49 +0100
From:   Roman Gushchin <guro@...com>
To:     David Rientjes <rientjes@...gle.com>
CC:     <linux-mm@...ck.org>, <linux-kernel@...r.kernel.org>,
        <linux-api@...r.kernel.org>, <kernel-team@...com>,
        Vlastimil Babka <vbabka@...e.cz>,
        Matthew Wilcox <willy@...radead.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Michal Hocko <mhocko@...e.com>,
        Johannes Weiner <hannes@...xchg.org>
Subject: Re: [PATCH] mm: don't show nr_indirectly_reclaimable in /proc/vmstat

On Wed, Apr 25, 2018 at 12:37:26PM -0700, David Rientjes wrote:
> On Wed, 25 Apr 2018, Roman Gushchin wrote:
> 
> > Don't show nr_indirectly_reclaimable in /proc/vmstat,
> > because there is no need in exporting this vm counter
> > to the userspace, and some changes are expected
> > in reclaimable object accounting, which can alter
> > this counter.
> > 
> 
> I don't think it should be a per-node vmstat, in this case.  It appears 
> only to be used for the global context.  Shouldn't this be handled like 
> totalram_pages, total_swap_pages, totalreserve_pages, etc?

Hi, David!

I don't see any reasons why re-using existing infrastructure for
fast vm counters is bad, and why should we re-invent it for this case.

Thanks!