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timers: fix itimer/many thread hang, v3 

- fix UP lockup
- another set of UP/SMP cleanups and simplifications

Signed-off-by: Frank Mayhar <fmayhar@google.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Frank Mayhar 2008-09-12 09:54:39 -07:00 committed by Ingo Molnar
parent 31d9284569
commit 7086efe1c1
3 changed files with 38 additions and 90 deletions
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1
include/linux/sched.h
View File

@ -2134,7 +2134,6 @@ static inline int thread_group_cputime_clone_thread(struct task_struct *curr)
return thread_group_cputime_alloc(curr);
}
static inline void thread_group_cputime_free(struct signal_struct *sig)
{
free_percpu(sig->cputime.totals);

1
kernel/sched.c
View File

@ -4046,7 +4046,6 @@ unsigned long long task_delta_exec(struct task_struct *p)
unsigned long flags;
u64 ns = 0;
rq = task_rq_lock(p, &flags);
if (task_current(rq, p)) {
u64 delta_exec;

126
kernel/sched_stats.h
View File

@ -276,133 +276,83 @@ sched_info_switch(struct task_struct *prev, struct task_struct *next)
* on CONFIG_SCHEDSTATS.
*/
#ifdef CONFIG_SMP
/**
* thread_group_cputime_account_user - Maintain utime for a thread group.
* account_group_user_time - Maintain utime for a thread group.
*
* @tgtimes: Pointer to thread_group_cputime structure.
* @cputime: Time value by which to increment the utime field of that
* structure.
* @tsk: Pointer to task structure.
* @cputime: Time value by which to increment the utime field of the
* thread_group_cputime structure.
*
* If thread group time is being maintained, get the structure for the
* running CPU and update the utime field there.
*/
static inline void thread_group_cputime_account_user(
struct thread_group_cputime *tgtimes,
cputime_t cputime)
static inline void account_group_user_time(struct task_struct *tsk,
cputime_t cputime)
{
if (tgtimes->totals) {
struct signal_struct *sig;
sig = tsk->signal;
if (unlikely(!sig))
return;
if (sig->cputime.totals) {
struct task_cputime *times;
times = per_cpu_ptr(tgtimes->totals, get_cpu());
times = per_cpu_ptr(sig->cputime.totals, get_cpu());
times->utime = cputime_add(times->utime, cputime);
put_cpu_no_resched();
}
}
/**
* thread_group_cputime_account_system - Maintain stime for a thread group.
* account_group_system_time - Maintain stime for a thread group.
*
* @tgtimes: Pointer to thread_group_cputime structure.
* @cputime: Time value by which to increment the stime field of that
* structure.
* @tsk: Pointer to task structure.
* @cputime: Time value by which to increment the stime field of the
* thread_group_cputime structure.
*
* If thread group time is being maintained, get the structure for the
* running CPU and update the stime field there.
*/
static inline void thread_group_cputime_account_system(
struct thread_group_cputime *tgtimes,
cputime_t cputime)
static inline void account_group_system_time(struct task_struct *tsk,
cputime_t cputime)
{
if (tgtimes->totals) {
struct signal_struct *sig;
sig = tsk->signal;
if (unlikely(!sig))
return;
if (sig->cputime.totals) {
struct task_cputime *times;
times = per_cpu_ptr(tgtimes->totals, get_cpu());
times = per_cpu_ptr(sig->cputime.totals, get_cpu());
times->stime = cputime_add(times->stime, cputime);
put_cpu_no_resched();
}
}
/**
* thread_group_cputime_account_exec_runtime - Maintain exec runtime for a
* thread group.
* account_group_exec_runtime - Maintain exec runtime for a thread group.
*
* @tgtimes: Pointer to thread_group_cputime structure.
* @tsk: Pointer to task structure.
* @ns: Time value by which to increment the sum_exec_runtime field
* of that structure.
* of the thread_group_cputime structure.
*
* If thread group time is being maintained, get the structure for the
* running CPU and update the sum_exec_runtime field there.
*/
static inline void thread_group_cputime_account_exec_runtime(
struct thread_group_cputime *tgtimes,
unsigned long long ns)
static inline void account_group_exec_runtime(struct task_struct *tsk,
unsigned long long ns)
{
if (tgtimes->totals) {
struct signal_struct *sig;
sig = tsk->signal;
if (unlikely(!sig))
return;
if (sig->cputime.totals) {
struct task_cputime *times;
times = per_cpu_ptr(tgtimes->totals, get_cpu());
times = per_cpu_ptr(sig->cputime.totals, get_cpu());
times->sum_exec_runtime += ns;
put_cpu_no_resched();
}
}
#else /* CONFIG_SMP */
static inline void thread_group_cputime_account_user(
struct thread_group_cputime *tgtimes,
cputime_t cputime)
{
tgtimes->totals->utime = cputime_add(tgtimes->totals->utime, cputime);
}
static inline void thread_group_cputime_account_system(
struct thread_group_cputime *tgtimes,
cputime_t cputime)
{
tgtimes->totals->stime = cputime_add(tgtimes->totals->stime, cputime);
}
static inline void thread_group_cputime_account_exec_runtime(
struct thread_group_cputime *tgtimes,
unsigned long long ns)
{
tgtimes->totals->sum_exec_runtime += ns;
}
#endif /* CONFIG_SMP */
/*
* These are the generic time-accounting routines that use the above
* functions. They are the functions actually called by the scheduler.
*/
static inline void account_group_user_time(struct task_struct *tsk,
cputime_t cputime)
{
struct signal_struct *sig;
sig = tsk->signal;
if (likely(sig))
thread_group_cputime_account_user(&sig->cputime, cputime);
}
static inline void account_group_system_time(struct task_struct *tsk,
cputime_t cputime)
{
struct signal_struct *sig;
sig = tsk->signal;
if (likely(sig))
thread_group_cputime_account_system(&sig->cputime, cputime);
}
static inline void account_group_exec_runtime(struct task_struct *tsk,
unsigned long long ns)
{
struct signal_struct *sig;
sig = tsk->signal;
if (likely(sig))
thread_group_cputime_account_exec_runtime(&sig->cputime, ns);
}