]> pilppa.com Git - linux-2.6-omap-h63xx.git/commit
[PATCH] posix timers: RCU optimization for clock_gettime()
authorPaul E. McKenney <paulmck@linux.vnet.ibm.com>
Fri, 16 Feb 2007 09:28:22 +0000 (01:28 -0800)
committerLinus Torvalds <torvalds@woody.linux-foundation.org>
Fri, 16 Feb 2007 16:14:00 +0000 (08:14 -0800)
commit1f2ea0837dbc263ce2a2512c4e73c83df68a6a55
tree8e033c747852671f3d4d2cb0bc677dab9ecfc441
parent7460ed2844ffad7141e30271c0c3da8336e66014
[PATCH] posix timers: RCU optimization for clock_gettime()

Use RCU to avoid the need to acquire tasklist_lock in the single-threaded
case of clock_gettime().  It still acquires tasklist_lock when for a
(potentially multithreaded) process.  This change allows realtime
applications to frequently monitor CPU consumption of individual tasks, as
requested (and now deployed) by some off-list users.

This has been in Ingo Molnar's -rt patchset since late 2005 with no
problems reported, and tests successfully on 2.6.20-rc6, so I believe that
it is long-since ready for mainline adoption.

[paulmck@linux.vnet.ibm.com: fix exit()/posix_cpu_clock_get() race spotted by Oleg]
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: john stultz <johnstul@us.ibm.com>
Cc: Roman Zippel <zippel@linux-m68k.org>
Cc: Oleg Nesterov <oleg@tv-sign.ru>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
kernel/posix-cpu-timers.c