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Subject[PATCH 1/1] IPC - Document the new auto_msgmni proc file
Sorry for the delay but this message has been queued for 5 days (my sendmail
was not correclty configured) - resending.

[PATCH 01/01]

This patch updates Documentation/filesystems/proc.txt: it describes the file
auto_msgmni intoduced to enable/disable msgmni automatic recomputing upon
memory add/remove (see thread
Also added a description for msgmni (this filex is only listed in

Applies to 2.6.27-rc1-mm1.

Signed-off-by: Nadia Derbey <>

Documentation/filesystems/proc.txt | 19 +++++++++++++++++++
1 file changed, 19 insertions(+)
Index: linux-2.6.27-rc1-mm1/Documentation/filesystems/proc.txt
--- linux-2.6.27-rc1-mm1.orig/Documentation/filesystems/proc.txt 2008-08-21 09:43:36.000000000 +0200
+++ linux-2.6.27-rc1-mm1/Documentation/filesystems/proc.txt 2008-08-21 10:17:28.000000000 +0200
@@ -1339,6 +1339,25 @@ Enables/Disables the protection of the p
"smaps". When enabled, the contents of these files are visible only to
readers that are allowed to ptrace() the given process.

+Maximum number of message queue ids on the system.
+This value scales to the amount of lowmem. It is automatically recomputed
+upon memory add/remove or ipc namespace creation/removal.
+When a value is written into this file, msgmni's value becomes fixed, i.e. it
+is not recomputed anymore when one of the above events occurs.
+Use auto_msgmni to change this behavior.
+Enables/Disables automatic recomputing of msgmni upon memory add/remove or
+upon ipc namespace creation/removal (see the msgmni description above).
+Echoing "1" into this file enables msgmni automatic recomputing.
+Echoing "0" turns it off.
+auto_msgmni default value is 1.

2.4 /proc/sys/vm - The virtual memory subsystem

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