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authorPaul E. McKenney <paulmck@linux.vnet.ibm.com>2007-02-16 04:28:22 -0500
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-02-16 11:14:00 -0500
commit1f2ea0837dbc263ce2a2512c4e73c83df68a6a55 (patch)
tree8e033c747852671f3d4d2cb0bc677dab9ecfc441 /kernel/posix-cpu-timers.c
parent7460ed2844ffad7141e30271c0c3da8336e66014 (diff)
[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/posix-cpu-timers.c')
-rw-r--r--kernel/posix-cpu-timers.c15
1 files changed, 10 insertions, 5 deletions
diff --git a/kernel/posix-cpu-timers.c b/kernel/posix-cpu-timers.c
index 7c3e1e6dfb5b..657f77697415 100644
--- a/kernel/posix-cpu-timers.c
+++ b/kernel/posix-cpu-timers.c
@@ -304,7 +304,7 @@ int posix_cpu_clock_get(const clockid_t which_clock, struct timespec *tp)
304 * should be able to see it. 304 * should be able to see it.
305 */ 305 */
306 struct task_struct *p; 306 struct task_struct *p;
307 read_lock(&tasklist_lock); 307 rcu_read_lock();
308 p = find_task_by_pid(pid); 308 p = find_task_by_pid(pid);
309 if (p) { 309 if (p) {
310 if (CPUCLOCK_PERTHREAD(which_clock)) { 310 if (CPUCLOCK_PERTHREAD(which_clock)) {
@@ -312,12 +312,17 @@ int posix_cpu_clock_get(const clockid_t which_clock, struct timespec *tp)
312 error = cpu_clock_sample(which_clock, 312 error = cpu_clock_sample(which_clock,
313 p, &rtn); 313 p, &rtn);
314 } 314 }
315 } else if (p->tgid == pid && p->signal) { 315 } else {
316 error = cpu_clock_sample_group(which_clock, 316 read_lock(&tasklist_lock);
317 p, &rtn); 317 if (p->tgid == pid && p->signal) {
318 error =
319 cpu_clock_sample_group(which_clock,
320 p, &rtn);
321 }
322 read_unlock(&tasklist_lock);
318 } 323 }
319 } 324 }
320 read_unlock(&tasklist_lock); 325 rcu_read_unlock();
321 } 326 }
322 327
323 if (error) 328 if (error)