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authorFrederic Weisbecker <fweisbec@gmail.com>2013-10-11 17:41:11 +0200
committerFrederic Weisbecker <fweisbec@gmail.com>2013-12-09 16:53:51 +0100
commit33ab0fec33527e8b5ab124cff6aefd4746508e04 (patch)
treeb2802de1741f3af7e76fa47402d82e903947bc5b /kernel/posix-cpu-timers.c
parentaf82eb3c3068877a6b1989796a06b846b1e9e1c3 (diff)
downloadop-kernel-dev-33ab0fec33527e8b5ab124cff6aefd4746508e04.zip
op-kernel-dev-33ab0fec33527e8b5ab124cff6aefd4746508e04.tar.gz
posix-timers: Consolidate posix_cpu_clock_get()
Consolidate the clock sampling common code used for both local and remote targets. Note that this introduces a tiny user ABI change: if a PID is passed to clock_gettime() along the clockid, we used to forbid a process wide clock sample when that PID doesn't belong to a group leader. Now after this patch we allow process wide clock samples if that PID belongs to the current task, even if the current task is not the group leader. But local process wide clock samples are allowed if PID == 0 (current task) even if the current task is not the group leader. So in the end this should be no big deal as this actually harmonize the behaviour when the remote sample is actually a local one. Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Ingo Molnar <mingo@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Oleg Nesterov <oleg@redhat.com> Cc: Kosaki Motohiro <kosaki.motohiro@jp.fujitsu.com> Cc: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'kernel/posix-cpu-timers.c')
-rw-r--r--kernel/posix-cpu-timers.c64
1 files changed, 30 insertions, 34 deletions
diff --git a/kernel/posix-cpu-timers.c b/kernel/posix-cpu-timers.c
index e6389f9..03c5d6c3 100644
--- a/kernel/posix-cpu-timers.c
+++ b/kernel/posix-cpu-timers.c
@@ -260,30 +260,43 @@ static int cpu_clock_sample_group(const clockid_t which_clock,
return 0;
}
+static int posix_cpu_clock_get_task(struct task_struct *tsk,
+ const clockid_t which_clock,
+ struct timespec *tp)
+{
+ int err = -EINVAL;
+ unsigned long long rtn;
+
+ if (CPUCLOCK_PERTHREAD(which_clock)) {
+ if (same_thread_group(tsk, current))
+ err = cpu_clock_sample(which_clock, tsk, &rtn);
+ } else {
+ read_lock(&tasklist_lock);
+
+ if (tsk->sighand && (tsk == current || thread_group_leader(tsk)))
+ err = cpu_clock_sample_group(which_clock, tsk, &rtn);
+
+ read_unlock(&tasklist_lock);
+ }
+
+ if (!err)
+ sample_to_timespec(which_clock, rtn, tp);
+
+ return err;
+}
+
static int posix_cpu_clock_get(const clockid_t which_clock, struct timespec *tp)
{
const pid_t pid = CPUCLOCK_PID(which_clock);
- int error = -EINVAL;
- unsigned long long rtn;
+ int err = -EINVAL;
if (pid == 0) {
/*
* Special case constant value for our own clocks.
* We don't have to do any lookup to find ourselves.
*/
- if (CPUCLOCK_PERTHREAD(which_clock)) {
- /*
- * Sampling just ourselves we can do with no locking.
- */
- error = cpu_clock_sample(which_clock,
- current, &rtn);
- } else {
- read_lock(&tasklist_lock);
- error = cpu_clock_sample_group(which_clock,
- current, &rtn);
- read_unlock(&tasklist_lock);
- }
+ err = posix_cpu_clock_get_task(current, which_clock, tp);
} else {
/*
* Find the given PID, and validate that the caller
@@ -292,29 +305,12 @@ static int posix_cpu_clock_get(const clockid_t which_clock, struct timespec *tp)
struct task_struct *p;
rcu_read_lock();
p = find_task_by_vpid(pid);
- if (p) {
- if (CPUCLOCK_PERTHREAD(which_clock)) {
- if (same_thread_group(p, current)) {
- error = cpu_clock_sample(which_clock,
- p, &rtn);
- }
- } else {
- read_lock(&tasklist_lock);
- if (thread_group_leader(p) && p->sighand) {
- error =
- cpu_clock_sample_group(which_clock,
- p, &rtn);
- }
- read_unlock(&tasklist_lock);
- }
- }
+ if (p)
+ err = posix_cpu_clock_get_task(p, which_clock, tp);
rcu_read_unlock();
}
- if (error)
- return error;
- sample_to_timespec(which_clock, rtn, tp);
- return 0;
+ return err;
}
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