linux-kernel - [PATCH 4/5] Documentation: update sysctl/kernel.txt

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Message-ID: <20121026110612.17494.95224.stgit@localhost.localdomain>
Date:	Fri, 26 Oct 2012 15:06:12 +0400
From:	Stanislav Kinsbursky <skinsbursky@...allels.com>
To:	akpm@...ux-foundation.org
Cc:	Larry.Finger@...inger.net, mitsuo.hayasaka.hu@...achi.com,
	nhorman@...driver.com, linux-doc@...r.kernel.org,
	catalin.marinas@....com, xemul@...allels.com, will.deacon@....com,
	linux-kernel@...r.kernel.org, cmetcalf@...era.com,
	dhowells@...hat.com, ebiederm@...ssion.com, rob@...dley.net,
	dan@...dstab.net, tglx@...utronix.de, paulmck@...ux.vnet.ibm.com,
	devel@...nvz.org, mtk.manpages@...il.com
Subject: [PATCH 4/5] Documentation: update sysctl/kernel.txt

This patch adds documentation about new "msg_next_id", "sem_next_id" and
"shm_next_id" sysctls.

Signed-off-by: Stanislav Kinsbursky <skinsbursky@...allels.com>
---
 Documentation/sysctl/kernel.txt |   19 +++++++++++++++++++
 1 files changed, 19 insertions(+), 0 deletions(-)

diff --git a/Documentation/sysctl/kernel.txt b/Documentation/sysctl/kernel.txt
index 2907ba6..51b953a 100644
--- a/Documentation/sysctl/kernel.txt
+++ b/Documentation/sysctl/kernel.txt
@@ -38,6 +38,7 @@ show up in /proc/sys/kernel:
 - l2cr                        [ PPC only ]
 - modprobe                    ==> Documentation/debugging-modules.txt
 - modules_disabled
+- msg_next_id		      [ sysv ipc ]
 - msgmax
 - msgmnb
 - msgmni
@@ -62,7 +63,9 @@ show up in /proc/sys/kernel:
 - rtsig-max
 - rtsig-nr
 - sem
+- sem_next_id		      [ sysv ipc ]
 - sg-big-buff                 [ generic SCSI device (sg) ]
+- shm_next_id		      [ sysv ipc ]
 - shm_rmid_forced
 - shmall
 - shmmax                      [ sysv ipc ]
@@ -320,6 +323,22 @@ to false.
 
 ==============================================================
 
+msg_next_id, sem_next_id, and shm_next_id:
+
+These three toggles allows to specify desired id for next allocated IPC
+object: message, semaphore or shared memory respectively.
+
+By default they are equal to -1, which means generic allocation logic.
+Possible values to set are in range {0..INT_MAX}.
+
+Notes:
+1) kernel doesn't guarantee, that new object will have desired id. So,
+it's up to userspace, how to handle an object with "wrong" id.
+2) Toggle with non-default value will be set back to -1 by kernel after
+successful IPC object allocation.
+
+==============================================================
+
 nmi_watchdog:
 
 Enables/Disables the NMI watchdog on x86 systems. When the value is

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