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cputime: Use accessors to read task cputime stats

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This is in preparation for the full dynticks feature. While
remotely reading the cputime of a task running in a full
dynticks CPU, we'll need to do some extra-computation. This
way we can account the time it spent tickless in userspace
since its last cputime snapshot.

Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Li Zhong <zhong@linux.vnet.ibm.com>
Cc: Namhyung Kim <namhyung.kim@lge.com>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Paul Gortmaker <paul.gortmaker@windriver.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Frederic Weisbecker
2012-11-13 14:20:55 +01:00
parent 3f4724ea85
commit 6fac4829ce
16 changed files with 144 additions and 49 deletions
Download Patch File Download Diff File Expand all files Collapse all files
kernel/posix-cpu-timers.c
+22 -6
View File
@@ -155,11 +155,19 @@ static void bump_cpu_timer(struct k_itimer *timer,
static inline cputime_t prof_ticks(struct task_struct *p)
{
return p->utime + p->stime;
cputime_t utime, stime;
task_cputime(p, &utime, &stime);
return utime + stime;
}
static inline cputime_t virt_ticks(struct task_struct *p)
{
return p->utime;
cputime_t utime;
task_cputime(p, &utime, NULL);
return utime;
}
static int
@@ -471,18 +479,23 @@ static void cleanup_timers(struct list_head *head,
*/
void posix_cpu_timers_exit(struct task_struct *tsk)
{
cputime_t utime, stime;
add_device_randomness((const void*) &tsk->se.sum_exec_runtime,
sizeof(unsigned long long));
task_cputime(tsk, &utime, &stime);
cleanup_timers(tsk->cpu_timers,
tsk->utime, tsk->stime, tsk->se.sum_exec_runtime);
utime, stime, tsk->se.sum_exec_runtime);
}
void posix_cpu_timers_exit_group(struct task_struct *tsk)
{
struct signal_struct *const sig = tsk->signal;
cputime_t utime, stime;
task_cputime(tsk, &utime, &stime);
cleanup_timers(tsk->signal->cpu_timers,
tsk->utime + sig->utime, tsk->stime + sig->stime,
utime + sig->utime, stime + sig->stime,
tsk->se.sum_exec_runtime + sig->sum_sched_runtime);
}
@@ -1226,11 +1239,14 @@ static inline int task_cputime_expired(const struct task_cputime *sample,
static inline int fastpath_timer_check(struct task_struct *tsk)
{
struct signal_struct *sig;
cputime_t utime, stime;
task_cputime(tsk, &utime, &stime);
if (!task_cputime_zero(&tsk->cputime_expires)) {
struct task_cputime task_sample = {
.utime = tsk->utime,
.stime = tsk->stime,
.utime = utime,
.stime = stime,
.sum_exec_runtime = tsk->se.sum_exec_runtime
};