A-Team_Digital_Solutions/android_kernel_motorola_sm6375
Watch
2
0
Fork
You've already forked android_kernel_motorola_sm6375
 0
mirror of https://github.com/BobTheBlinker/android_kernel_motorola_sm6375.git synced 2026-10-28 18:51:56 -04:00
Code Issues Projects Releases Packages Wiki Activity

cpuset: Restore tasks affinity while moving across cpusets

Browse source 
When tasks move across cpusets, the current affinity settings
are lost. Cache the task affinity and restore it during cpuset
migration. The restoring happens only when the cached affinity
is subset of the current cpuset settings.

Change-Id: I6c2ec1d5e3d994e176926d94b9e0cc92418020cc
Signed-off-by: Pavankumar Kondeti <[email protected]>
[[email protected]: fix trivial merge conflicts and
replace cs->cpus_requested with cs->cpus_allowed]
Signed-off-by: Satya Durga Srinivasu Prabhala <[email protected]>
This commit is contained in:
Pavankumar Kondeti 2019-02-28 10:40:39 +05:30 • committed by Gerrit - the friendly Code Review server
commit 311342d796
4 changed files with 32 additions and 2 deletions
Download patch file Download diff file Expand all files Collapse all files

20
kernel/cgroup/cpuset.c
View file

@ -1022,6 +1022,22 @@ void rebuild_sched_domains(void)
put_online_cpus();
}
static int update_cpus_allowed(struct cpuset *cs, struct task_struct *p,
const struct cpumask *new_mask)
{
#ifdef CONFIG_SCHED_WALT
int ret;
if (cpumask_subset(&p->cpus_requested, cs->cpus_allowed)) {
ret = set_cpus_allowed_ptr(p, &p->cpus_requested);
if (!ret)
return ret;
}
#endif
return set_cpus_allowed_ptr(p, new_mask);
}
/**
* update_tasks_cpumask - Update the cpumasks of tasks in the cpuset.
* @cs: the cpuset in which each task's cpus_allowed mask needs to be changed
@ -1037,7 +1053,7 @@ static void update_tasks_cpumask(struct cpuset *cs)
css_task_iter_start(&cs->css, 0, &it);
while ((task = css_task_iter_next(&it)))
set_cpus_allowed_ptr(task, cs->effective_cpus);
update_cpus_allowed(cs, task, cs->effective_cpus);
css_task_iter_end(&it);
}
@ -2187,7 +2203,7 @@ static void cpuset_attach(struct cgroup_taskset *tset)
* can_attach beforehand should guarantee that this doesn't
* fail. TODO: have a better way to handle failure here
*/
WARN_ON_ONCE(set_cpus_allowed_ptr(task, cpus_attach));
WARN_ON_ONCE(update_cpus_allowed(cs, task, cpus_attach));
cpuset_change_task_nodemask(task, &cpuset_attach_nodemask_to);
cpuset_update_task_spread_flag(cs, task);

8
kernel/sched/core.c
View file

@ -5634,6 +5634,11 @@ again:
retval = -EINVAL;
}
#ifdef CONFIG_SCHED_WALT
if (!retval && !(p->flags & PF_KTHREAD))
cpumask_and(&p->cpus_requested, in_mask, cpu_possible_mask);
#endif
out_free_new_mask:
free_cpumask_var(new_mask);
out_free_cpus_allowed:
@ -6780,6 +6785,9 @@ void __init sched_init_smp(void)
/* Move init over to a non-isolated CPU */
if (set_cpus_allowed_ptr(current, housekeeping_cpumask(HK_FLAG_DOMAIN)) < 0)
BUG();
#ifdef CONFIG_SCHED_WALT
cpumask_copy(&current->cpus_requested, cpu_possible_mask);
#endif
sched_init_granularity();
init_sched_rt_class();