linux-kernel - Re: [PATCH RFC 0/5] mm/ksm, proc: introduce remote madvise

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Message-ID: <20190516172452.GA2106@avx2>
Date:   Thu, 16 May 2019 20:24:52 +0300
From:   Alexey Dobriyan <adobriyan@...il.com>
To:     Oleksandr Natalenko <oleksandr@...hat.com>
Cc:     linux-kernel@...r.kernel.org, Kirill Tkhai <ktkhai@...tuozzo.com>,
        Hugh Dickins <hughd@...gle.com>,
        Vlastimil Babka <vbabka@...e.cz>,
        Michal Hocko <mhocko@...e.com>,
        Matthew Wilcox <willy@...radead.org>,
        Pavel Tatashin <pasha.tatashin@...een.com>,
        Greg KH <greg@...ah.com>,
        Suren Baghdasaryan <surenb@...gle.com>,
        Minchan Kim <minchan@...nel.org>,
        Timofey Titovets <nefelim4ag@...il.com>,
        Aaron Tomlin <atomlin@...hat.com>,
        Grzegorz Halat <ghalat@...hat.com>, linux-mm@...ck.org,
        linux-api@...r.kernel.org
Subject: Re: [PATCH RFC 0/5] mm/ksm, proc: introduce remote madvise

On Thu, May 16, 2019 at 11:42:29AM +0200, Oleksandr Natalenko wrote:

> * to mark all the eligible VMAs as mergeable, use:
> 
>    # echo merge > /proc/<pid>/madvise
> 
> * to unmerge all the VMAs, use:
> 
>    # echo unmerge > /proc/<pid>/madvise

Please make a real system call (or abuse prctl(2) passing target's pid).

Your example automerge daemon could just call it and not bother with /proc.