Commit-ID: 2473f3e7a97ce8bc0fe7596cdb361b21221418eb
Gitweb: http://git.kernel.org/tip/2473f3e7a97ce8bc0fe7596cdb361b21221418eb
Author: Frederic Weisbecker <fweisbec@xxxxxxxxx>
AuthorDate: Fri, 28 Jun 2013 00:06:43 +0000
Committer: Frederic Weisbecker <fweisbec@xxxxxxxxx>
CommitDate: Wed, 3 Jul 2013 16:19:23 +0200
posix_cpu_timers: consolidate expired timers check
Consolidate the common code amongst per thread and per process timers list
on tick time.
List traversal, expiry check and subsequent updates can be shared in a
common helper.
Signed-off-by: Frederic Weisbecker <fweisbec@xxxxxxxxx>
Cc: Stanislaw Gruszka <sgruszka@xxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxx>
Cc: Oleg Nesterov <oleg@xxxxxxxxxx>
Cc: KOSAKI Motohiro <kosaki.motohiro@xxxxxxxxx>
Cc: Olivier Langlois <olivier@xxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
kernel/posix-cpu-timers.c | 118 +++++++++++++---------------------------------
1 file changed, 33 insertions(+), 85 deletions(-)
diff --git a/kernel/posix-cpu-timers.c b/kernel/posix-cpu-timers.c
index b1450ce..92a4fbf 100644
--- a/kernel/posix-cpu-timers.c
+++ b/kernel/posix-cpu-timers.c
@@ -862,6 +862,28 @@ static void posix_cpu_timer_get(struct k_itimer *timer, struct itimerspec *itp)
}
}
+static unsigned long long
+check_timers_list(struct list_head *timers,
+ struct list_head *firing,
+ unsigned long long curr)
+{
+ int maxfire = 20;
+
+ while (!list_empty(timers)) {
+ struct cpu_timer_list *t;
+
+ t = list_first_entry(timers, struct cpu_timer_list, entry);
+
+ if (!--maxfire || curr < t->expires)
+ return t->expires;
+
+ t->firing = 1;
+ list_move_tail(&t->entry, firing);
+ }
+
+ return 0;
+}
+
/*
* Check for any per-thread CPU timers that have fired and move them off
* the tsk->cpu_timers[N] list onto the firing list. Here we update the
@@ -870,54 +892,20 @@ static void posix_cpu_timer_get(struct k_itimer *timer, struct itimerspec *itp)
static void check_thread_timers(struct task_struct *tsk,
struct list_head *firing)
{
- int maxfire;
struct list_head *timers = tsk->cpu_timers;
struct signal_struct *const sig = tsk->signal;
+ struct task_cputime *tsk_expires = &tsk->cputime_expires;
+ unsigned long long expires;
unsigned long soft;
- maxfire = 20;
- tsk->cputime_expires.prof_exp = 0;
- while (!list_empty(timers)) {
- struct cpu_timer_list *t = list_first_entry(timers,
- struct cpu_timer_list,
- entry);
- if (!--maxfire || prof_ticks(tsk) < t->expires) {
- tsk->cputime_expires.prof_exp = expires_to_cputime(t->expires);
- break;
- }
- t->firing = 1;
- list_move_tail(&t->entry, firing);
- }
+ expires = check_timers_list(timers, firing, prof_ticks(tsk));
+ tsk_expires->prof_exp = expires_to_cputime(expires);
- ++timers;
- maxfire = 20;
- tsk->cputime_expires.virt_exp = 0;
- while (!list_empty(timers)) {
- struct cpu_timer_list *t = list_first_entry(timers,
- struct cpu_timer_list,
- entry);
- if (!--maxfire || virt_ticks(tsk) < t->expires) {
- tsk->cputime_expires.virt_exp = expires_to_cputime(t->expires);
- break;
- }
- t->firing = 1;
- list_move_tail(&t->entry, firing);
- }
+ expires = check_timers_list(++timers, firing, virt_ticks(tsk));
+ tsk_expires->virt_exp = expires_to_cputime(expires);
- ++timers;
- maxfire = 20;
- tsk->cputime_expires.sched_exp = 0;
- while (!list_empty(timers)) {
- struct cpu_timer_list *t = list_first_entry(timers,
- struct cpu_timer_list,
- entry);
- if (!--maxfire || tsk->se.sum_exec_runtime < t->expires) {
- tsk->cputime_expires.sched_exp = t->expires;
- break;
- }
- t->firing = 1;
- list_move_tail(&t->entry, firing);
- }
+ tsk_expires->sched_exp = check_timers_list(++timers, firing,
+ tsk->se.sum_exec_runtime);
/*
* Check for the special case thread timers.
@@ -1002,7 +990,6 @@ static void check_cpu_itimer(struct task_struct *tsk, struct cpu_itimer *it,
static void check_process_timers(struct task_struct *tsk,
struct list_head *firing)
{
- int maxfire;
struct signal_struct *const sig = tsk->signal;
unsigned long long utime, ptime, virt_expires, prof_expires;
unsigned long long sum_sched_runtime, sched_expires;
@@ -1017,49 +1004,10 @@ static void check_process_timers(struct task_struct *tsk,
utime = cputime_to_expires(cputime.utime);
ptime = utime + cputime_to_expires(cputime.stime);
sum_sched_runtime = cputime.sum_exec_runtime;
- maxfire = 20;
- prof_expires = 0;
- while (!list_empty(timers)) {
- struct cpu_timer_list *tl = list_first_entry(timers,
- struct cpu_timer_list,
- entry);
- if (!--maxfire || ptime < tl->expires) {
- prof_expires = tl->expires;
- break;
- }
- tl->firing = 1;
- list_move_tail(&tl->entry, firing);
- }
- ++timers;
- maxfire = 20;
- virt_expires = 0;
- while (!list_empty(timers)) {
- struct cpu_timer_list *tl = list_first_entry(timers,
- struct cpu_timer_list,
- entry);
- if (!--maxfire || utime < tl->expires) {
- virt_expires = tl->expires;
- break;
- }
- tl->firing = 1;
- list_move_tail(&tl->entry, firing);
- }
-
- ++timers;
- maxfire = 20;
- sched_expires = 0;
- while (!list_empty(timers)) {
- struct cpu_timer_list *tl = list_first_entry(timers,
- struct cpu_timer_list,
- entry);
- if (!--maxfire || sum_sched_runtime < tl->expires) {
- sched_expires = tl->expires;
- break;
- }
- tl->firing = 1;
- list_move_tail(&tl->entry, firing);
- }
+ prof_expires = check_timers_list(timers, firing, ptime);
+ virt_expires = check_timers_list(++timers, firing, utime);
+ sched_expires = check_timers_list(++timers, firing, sum_sched_runtime);
/*
* Check for the special case process timers.
--
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