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posix_cpu_timers: consolidate timer list cleanups 

Cleaning up the posix cpu timers on task exit shares some common code
among timer list types, most notably the list traversal and expiry time
update.

Unify this in a common helper.

Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Stanislaw Gruszka <sgruszka@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: KOSAKI Motohiro <kosaki.motohiro@gmail.com>
Cc: Olivier Langlois <olivier@trillion01.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Frederic Weisbecker 2013-06-28 00:06:42 +00:00
parent 55ccb616a6
commit 1a7fa510b3
1 changed files with 19 additions and 29 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

48
kernel/posix-cpu-timers.c
View File

@ -399,6 +399,21 @@ static int posix_cpu_timer_del(struct k_itimer *timer)
return ret;
}
static void cleanup_timers_list(struct list_head *head,
unsigned long long curr)
{
struct cpu_timer_list *timer, *next;
list_for_each_entry_safe(timer, next, head, entry) {
list_del_init(&timer->entry);
if (timer->expires < curr) {
timer->expires = 0;
} else {
timer->expires -= curr;
}
}
}
/*
* Clean out CPU timers still ticking when a thread exited. The task
* pointer is cleared, and the expiry time is replaced with the residual
@ -409,37 +424,12 @@ static void cleanup_timers(struct list_head *head,
cputime_t utime, cputime_t stime,
unsigned long long sum_exec_runtime)
{
struct cpu_timer_list *timer, *next;
cputime_t ptime = utime + stime;
list_for_each_entry_safe(timer, next, head, entry) {
list_del_init(&timer->entry);
if (timer->expires < cputime_to_expires(ptime)) {
timer->expires = 0;
} else {
timer->expires -= cputime_to_expires(ptime);
}
}
++head;
list_for_each_entry_safe(timer, next, head, entry) {
list_del_init(&timer->entry);
if (timer->expires < cputime_to_expires(utime)) {
timer->expires = 0;
} else {
timer->expires -= cputime_to_expires(utime);
}
}
++head;
list_for_each_entry_safe(timer, next, head, entry) {
list_del_init(&timer->entry);
if (timer->expires < sum_exec_runtime) {
timer->expires = 0;
} else {
timer->expires -= sum_exec_runtime;
}
}
cleanup_timers_list(head, cputime_to_expires(ptime));
cleanup_timers_list(++head, cputime_to_expires(utime));
cleanup_timers_list(++head, sum_exec_runtime);
}
/*