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sched/walt: Cache the affinity of a user space task

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When a user space task move across cpuset cgroups, the affinity
settings are lost. Fix this issue by caching the affinity of
a user space task during affinity change system call and restore
it during cpuset cgroup change when possible. The cpuset part
is implemented in the code but affinity system call part is
not implemented. This patch implements that.

Change-Id: I9322400eb275aeeb35fb623210417df4730cc6ad
Signed-off-by: Pavankumar Kondeti <pkondeti@codeaurora.org>
This commit is contained in:
Pavankumar Kondeti 2021-04-20 11:50:22 +05:30 committed by Rishabh Bhatnagar
parent 2e720fa7e7
commit 4dfdcf521a
1 changed files with 22 additions and 0 deletions
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22
kernel/sched/walt/walt.c
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@ -4003,6 +4003,27 @@ static void android_rvh_update_cpus_allowed(void *unused, struct task_struct *p,
*ret = set_cpus_allowed_ptr(p, &wts->cpus_requested);
}
static void android_rvh_sched_setaffinity(void *unused, struct task_struct *p,
const struct cpumask *in_mask,
int *retval)
{
struct walt_task_struct *wts = (struct walt_task_struct *) p->android_vendor_data1;
if (unlikely(walt_disabled))
return;
/* nothing to do if the affinity call failed */
if (*retval)
return;
/*
* cache the affinity for user space tasks so that they
* can be restored during cpuset cgroup change.
*/
if (!(p->flags & PF_KTHREAD))
cpumask_and(&wts->cpus_requested, in_mask, cpu_possible_mask);
}
static void android_rvh_sched_fork_init(void *unused, struct task_struct *p)
{
struct walt_task_struct *wts = (struct walt_task_struct *) p->android_vendor_data1;
@ -4061,6 +4082,7 @@ static void register_walt_hooks(void)
register_trace_android_rvh_cpu_cgroup_attach(android_rvh_cpu_cgroup_attach, NULL);
register_trace_android_rvh_cpu_cgroup_online(android_rvh_cpu_cgroup_online, NULL);
register_trace_android_rvh_update_cpus_allowed(android_rvh_update_cpus_allowed, NULL);
register_trace_android_rvh_sched_setaffinity(android_rvh_sched_setaffinity, NULL);
register_trace_android_rvh_sched_fork_init(android_rvh_sched_fork_init, NULL);
register_trace_android_rvh_ttwu_cond(android_rvh_ttwu_cond, NULL);
register_trace_android_rvh_sched_exec(android_rvh_sched_exec, NULL);