Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
Merge tag 'sched-urgent-2025-03-07' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull misc scheduler fixes from Ingo Molnar:
- Fix deadline scheduler sysctl parameter setting bug
- Fix RT scheduler sysctl parameter setting bug
- Fix possible memory corruption in child_cfs_rq_on_list()
* tag 'sched-urgent-2025-03-07' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
sched/rt: Update limit of sched_rt sysctl in documentation
sched/deadline: Use online cpus for validating runtime
sched/fair: Fix potential memory corruption in child_cfs_rq_on_list
+8
-3
+3
Documentation/scheduler/sched-rt-group.rst
+3
Documentation/scheduler/sched-rt-group.rst
···
102
102
* sched_rt_period_us takes values from 1 to INT_MAX.
103
103
* sched_rt_runtime_us takes values from -1 to sched_rt_period_us.
104
104
* A run time of -1 specifies runtime == period, ie. no limit.
105
+
* sched_rt_runtime_us/sched_rt_period_us > 0.05 inorder to preserve
106
+
bandwidth for fair dl_server. For accurate value check average of
107
+
runtime/period in /sys/kernel/debug/sched/fair_server/cpuX/
105
108
106
109
107
110
2.2 Default behaviour
+1
-1
kernel/sched/deadline.c
+1
-1
kernel/sched/deadline.c
+4
-2
kernel/sched/fair.c
+4
-2
kernel/sched/fair.c
···
4045
4045
{
4046
4046
struct cfs_rq *prev_cfs_rq;
4047
4047
struct list_head *prev;
4048
+
struct rq *rq = rq_of(cfs_rq);
4048
4049
4049
4050
if (cfs_rq->on_list) {
4050
4051
prev = cfs_rq->leaf_cfs_rq_list.prev;
4051
4052
} else {
4052
-
struct rq *rq = rq_of(cfs_rq);
4053
-
4054
4053
prev = rq->tmp_alone_branch;
4055
4054
}
4055
+
4056
+
if (prev == &rq->leaf_cfs_rq_list)
4057
+
return false;
4056
4058
4057
4059
prev_cfs_rq = container_of(prev, struct cfs_rq, leaf_cfs_rq_list);
4058
4060