linux-kernel - Re: [PATCH RFC 0/4] mm/ksm: add option to automerge VMAs

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Message-ID: <20190513120117.aeiij4v2ncu43yxt@butterfly.localdomain>
Date:   Mon, 13 May 2019 14:01:17 +0200
From:   Oleksandr Natalenko <oleksandr@...hat.com>
To:     Timofey Titovets <nefelim4ag@...il.com>
Cc:     Kirill Tkhai <ktkhai@...tuozzo.com>,
        Linux Kernel <linux-kernel@...r.kernel.org>,
        Vlastimil Babka <vbabka@...e.cz>,
        Michal Hocko <mhocko@...e.com>,
        Matthew Wilcox <willy@...radead.org>,
        Pavel Tatashin <pasha.tatashin@...een.com>,
        Aaron Tomlin <atomlin@...hat.com>, linux-mm@...ck.org
Subject: Re: [PATCH RFC 0/4] mm/ksm: add option to automerge VMAs

On Mon, May 13, 2019 at 02:48:29PM +0300, Timofey Titovets wrote:
> > Also, just for the sake of another piece of stats here:
> >
> > $ echo "$(cat /sys/kernel/mm/ksm/pages_sharing) * 4 / 1024" | bc
> > 526
> 
> IIRC, for calculate saving you must use (pages_shared - pages_sharing)

Based on Documentation/ABI/testing/sysfs-kernel-mm-ksm:

	pages_shared: how many shared pages are being used.

	pages_sharing: how many more sites are sharing them i.e. how
	much saved.

and unless I'm missing something, this must be already accounted:

[~]$ echo "$(cat /sys/kernel/mm/ksm/pages_shared) * 4 / 1024" | bc
69

[~]$ echo "$(cat /sys/kernel/mm/ksm/pages_sharing) * 4 / 1024" | bc
563

-- 
  Best regards,
    Oleksandr Natalenko (post-factum)
    Senior Software Maintenance Engineer