linux-kernel - Re: [RFC] fs/proc/meminfo: introduce Unaccounted statistic

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Message-ID: <20161020133358.GN14609@dhcp22.suse.cz>
Date:   Thu, 20 Oct 2016 15:33:58 +0200
From:   Michal Hocko <mhocko@...nel.org>
To:     Vlastimil Babka <vbabka@...e.cz>
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        Andrew Morton <akpm@...ux-foundation.org>,
        Mel Gorman <mgorman@...hsingularity.net>,
        Johannes Weiner <hannes@...xchg.org>,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        Hugh Dickins <hughd@...gle.com>,
        David Rientjes <rientjes@...gle.com>
Subject: Re: [RFC] fs/proc/meminfo: introduce Unaccounted statistic

On Thu 20-10-16 14:11:49, Vlastimil Babka wrote:
[...]
> Hi, I'm wondering if people would find this useful. If you think it is, and
> to not make performance worse, I could also make sure in proper submission
> that values are not read via global_page_state() multiple times etc...

I definitely find this information useful and hate to do the math all
the time but on the other hand this is quite fragile and I can imagine
we can easily forget to add something there and provide a misleading
information to the userspace. So I would be worried with a long term
maintainability of this.
-- 
Michal Hocko
SUSE Labs