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| author | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2007-02-16 01:28:22 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-02-16 08:14:00 -0800 |
| commit | 1f2ea0837dbc263ce2a2512c4e73c83df68a6a55 (patch) | |
| tree | 8e033c747852671f3d4d2cb0bc677dab9ecfc441 /kernel/mutex-debug.h | |
| parent | 7460ed2844ffad7141e30271c0c3da8336e66014 (diff) | |
| download | blackbird-op-linux-1f2ea0837dbc263ce2a2512c4e73c83df68a6a55.tar.gz blackbird-op-linux-1f2ea0837dbc263ce2a2512c4e73c83df68a6a55.zip | |
[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>
Diffstat (limited to 'kernel/mutex-debug.h')
0 files changed, 0 insertions, 0 deletions
