Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
sched_ext: Mark scx_sched_hash insecure_elasticity
scx_sched_hash is inserted into under scx_sched_lock (raw_spinlock_irq)
in scx_link_sched(). rhashtable's sync grow path calls get_random_u32()
and does a GFP_ATOMIC allocation; both acquire regular spinlocks, which
is unsafe under raw_spinlock_t. Set insecure_elasticity to skip the
sync grow.
v2:
- Dropped dsq_hash changes. Insertion is not under raw_spin_lock.
- Switched from no_sync_grow flag to insecure_elasticity.
Fixes: 25037af712eb ("sched_ext: Add rhashtable lookup for sub-schedulers")
Signed-off-by: Tejun Heo <tj@kernel.org>
+1
+1
kernel/sched/ext.c
+1
kernel/sched/ext.c
···
32
32
.key_len = sizeof_field(struct scx_sched, ops.sub_cgroup_id),
33
33
.key_offset = offsetof(struct scx_sched, ops.sub_cgroup_id),
34
34
.head_offset = offsetof(struct scx_sched, hash_node),
35
+
.insecure_elasticity = true, /* inserted under scx_sched_lock */
35
36
};
36
37
37
38
static struct rhashtable scx_sched_hash;