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Merge branch 'sched-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip

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* 'sched-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
  cpuset: fix regression when failed to generate sched domains
  sched, signals: fix the racy usage of ->signal in account_group_xxx/run_posix_cpu_timers
  sched: fix kernel warning on /proc/sched_debug access
  sched: correct sched-rt-group.txt pathname in init/Kconfig
This commit is contained in:
Linus Torvalds 2008-11-18 08:06:21 -08:00
commit 8c60bfb066
6 changed files with 35 additions and 19 deletions
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2
init/Kconfig
View File

@ -354,7 +354,7 @@ config RT_GROUP_SCHED
setting below. If enabled, it will also make it impossible to
schedule realtime tasks for non-root users until you allocate
realtime bandwidth for them.
See Documentation/sched-rt-group.txt for more information.
See Documentation/scheduler/sched-rt-group.txt for more information.
choice
depends on GROUP_SCHED

12
kernel/cpuset.c
View File

@ -587,7 +587,6 @@ static int generate_sched_domains(cpumask_t **domains,
int ndoms; /* number of sched domains in result */
int nslot; /* next empty doms[] cpumask_t slot */
ndoms = 0;
doms = NULL;
dattr = NULL;
csa = NULL;
@ -674,10 +673,8 @@ restart:
* Convert <csn, csa> to <ndoms, doms> and populate cpu masks.
*/
doms = kmalloc(ndoms * sizeof(cpumask_t), GFP_KERNEL);
if (!doms) {
ndoms = 0;
if (!doms)
goto done;
}
/*
* The rest of the code, including the scheduler, can deal with
@ -732,6 +729,13 @@ restart:
done:
kfree(csa);
/*
* Fallback to the default domain if kmalloc() failed.
* See comments in partition_sched_domains().
*/
if (doms == NULL)
ndoms = 1;
*domains = doms;
*attributes = dattr;
return ndoms;

7
kernel/posix-cpu-timers.c
View File

@ -1308,9 +1308,10 @@ 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 = tsk->signal;
struct signal_struct *sig;
if (unlikely(!sig))
/* tsk == current, ensure it is safe to use ->signal/sighand */
if (unlikely(tsk->exit_state))
return 0;
if (!task_cputime_zero(&tsk->cputime_expires)) {
@ -1323,6 +1324,8 @@ static inline int fastpath_timer_check(struct task_struct *tsk)
if (task_cputime_expired(&task_sample, &tsk->cputime_expires))
return 1;
}
sig = tsk->signal;
if (!task_cputime_zero(&sig->cputime_expires)) {
struct task_cputime group_sample;

13
kernel/sched.c
View File

@ -7789,13 +7789,14 @@ static int dattrs_equal(struct sched_domain_attr *cur, int idx_cur,
*
* The passed in 'doms_new' should be kmalloc'd. This routine takes
* ownership of it and will kfree it when done with it. If the caller
* failed the kmalloc call, then it can pass in doms_new == NULL,
* and partition_sched_domains() will fallback to the single partition
* 'fallback_doms', it also forces the domains to be rebuilt.
* failed the kmalloc call, then it can pass in doms_new == NULL &&
* ndoms_new == 1, and partition_sched_domains() will fallback to
* the single partition 'fallback_doms', it also forces the domains
* to be rebuilt.
*
* If doms_new==NULL it will be replaced with cpu_online_map.
* ndoms_new==0 is a special case for destroying existing domains.
* It will not create the default domain.
* If doms_new == NULL it will be replaced with cpu_online_map.
* ndoms_new == 0 is a special case for destroying existing domains,
* and it will not create the default domain.
*
* Call with hotplug lock held
*/

5
kernel/sched_debug.c
View File

@ -423,10 +423,11 @@ void proc_sched_show_task(struct task_struct *p, struct seq_file *m)
#undef __P
{
unsigned int this_cpu = raw_smp_processor_id();
u64 t0, t1;
t0 = sched_clock();
t1 = sched_clock();
t0 = cpu_clock(this_cpu);
t1 = cpu_clock(this_cpu);
SEQ_printf(m, "%-35s:%21Ld\n",
"clock-delta", (long long)(t1-t0));
}

15
kernel/sched_stats.h
View File

@ -298,9 +298,11 @@ static inline void account_group_user_time(struct task_struct *tsk,
{
struct signal_struct *sig;
sig = tsk->signal;
if (unlikely(!sig))
/* tsk == current, ensure it is safe to use ->signal */
if (unlikely(tsk->exit_state))
return;
sig = tsk->signal;
if (sig->cputime.totals) {
struct task_cputime *times;
@ -325,9 +327,11 @@ static inline void account_group_system_time(struct task_struct *tsk,
{
struct signal_struct *sig;
sig = tsk->signal;
if (unlikely(!sig))
/* tsk == current, ensure it is safe to use ->signal */
if (unlikely(tsk->exit_state))
return;
sig = tsk->signal;
if (sig->cputime.totals) {
struct task_cputime *times;
@ -353,8 +357,11 @@ static inline void account_group_exec_runtime(struct task_struct *tsk,
struct signal_struct *sig;
sig = tsk->signal;
/* see __exit_signal()->task_rq_unlock_wait() */
barrier();
if (unlikely(!sig))
return;
if (sig->cputime.totals) {
struct task_cputime *times;