linux-kernel - [PATCH RFC 5/5] mm/ksm, proc: add remote madvise documentation

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Date:   Thu, 16 May 2019 11:42:34 +0200
From:   Oleksandr Natalenko <oleksandr@...hat.com>
To:     linux-kernel@...r.kernel.org
Cc:     Kirill Tkhai <ktkhai@...tuozzo.com>,
        Hugh Dickins <hughd@...gle.com>,
        Alexey Dobriyan <adobriyan@...il.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: [PATCH RFC 5/5] mm/ksm, proc: add remote madvise documentation

Document respective /proc/<pid>/madvise knob.

Signed-off-by: Oleksandr Natalenko <oleksandr@...hat.com>
---
 Documentation/filesystems/proc.txt | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/Documentation/filesystems/proc.txt b/Documentation/filesystems/proc.txt
index 66cad5c86171..17106e435bba 100644
--- a/Documentation/filesystems/proc.txt
+++ b/Documentation/filesystems/proc.txt
@@ -45,6 +45,7 @@ Table of Contents
   3.9   /proc/<pid>/map_files - Information about memory mapped files
   3.10  /proc/<pid>/timerslack_ns - Task timerslack value
   3.11	/proc/<pid>/patch_state - Livepatch patch operation state
+  3.12  /proc/<pid>/madvise - Remote madvise
 
   4	Configuring procfs
   4.1	Mount options
@@ -1948,6 +1949,18 @@ patched.  If the patch is being enabled, then the task has already been
 patched.  If the patch is being disabled, then the task hasn't been
 unpatched yet.
 
+3.12    /proc/<pid>/madvise - Remote madvise
+--------------------------------------------
+This write-only file allows executing madvise operation for another task.
+
+If CONFIG_KSM is enabled, the following actions are available:
+
+  * marking task's memory as mergeable:
+    # echo merge > /proc/<pid>/madvise
+
+  * unmerging all the task's memory:
+    # echo unmerge > /proc/<pid>/madvise
+
 
 ------------------------------------------------------------------------------
 Configuring procfs
-- 
2.21.0