linux-kernel - Re: [PATCH RFC v2 4/4] mm/ksm: add force merging/unmerging documentation

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Date:   Wed, 15 May 2019 03:53:55 +0300
From:   Timofey Titovets <nefelim4ag@...il.com>
To:     Oleksandr Natalenko <oleksandr@...hat.com>
Cc:     Linux Kernel <linux-kernel@...r.kernel.org>,
        Kirill Tkhai <ktkhai@...tuozzo.com>,
        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>,
        Grzegorz Halat <ghalat@...hat.com>, linux-mm@...ck.org
Subject: Re: [PATCH RFC v2 4/4] mm/ksm: add force merging/unmerging documentation

LGTM for whole series

Reviewed-by: Timofey Titovets <nefelim4ag@...il.com>

вт, 14 мая 2019 г. в 16:17, Oleksandr Natalenko <oleksandr@...hat.com>:
>
> Document respective sysfs knob.
>
> Signed-off-by: Oleksandr Natalenko <oleksandr@...hat.com>
> ---
>  Documentation/admin-guide/mm/ksm.rst | 11 +++++++++++
>  1 file changed, 11 insertions(+)
>
> diff --git a/Documentation/admin-guide/mm/ksm.rst b/Documentation/admin-guide/mm/ksm.rst
> index 9303786632d1..4302b92910ec 100644
> --- a/Documentation/admin-guide/mm/ksm.rst
> +++ b/Documentation/admin-guide/mm/ksm.rst
> @@ -78,6 +78,17 @@ KSM daemon sysfs interface
>  The KSM daemon is controlled by sysfs files in ``/sys/kernel/mm/ksm/``,
>  readable by all but writable only by root:
>
> +force_madvise
> +        write-only control to force merging/unmerging for specific
> +        task.
> +
> +        To mark the VMAs as mergeable, use:
> +        ``echo PID > /sys/kernel/mm/ksm/force_madvise``
> +
> +        To unmerge all the VMAs, use:
> +        ``echo -PID > /sys/kernel/mm/ksm/force_madvise``
> +        (note the prepending "minus")
> +
In patch 3/4 you have special case with PID 0,
may be that also must be documented here?

>  pages_to_scan
>          how many pages to scan before ksmd goes to sleep
>          e.g. ``echo 100 > /sys/kernel/mm/ksm/pages_to_scan``.
> --
> 2.21.0
>


--
Have a nice day,
Timofey.