Use rcu_read_lock_dont_migrate() and rcu_read_unlock_migrate() in bpf_prog_run_array_cg to obtain better performance when PREEMPT_RCU is not enabled. Signed-off-by: Menglong Dong <dongml2@xxxxxxxxxxxxxxx> --- v2: - use rcu_read_lock_dont_migrate() instead of rcu_migrate_disable() --- kernel/bpf/cgroup.c | 6 ++---- 1 file changed, 2 insertions(+), 4 deletions(-) diff --git a/kernel/bpf/cgroup.c b/kernel/bpf/cgroup.c index 180b630279b9..9912c7b9a266 100644 --- a/kernel/bpf/cgroup.c +++ b/kernel/bpf/cgroup.c @@ -71,8 +71,7 @@ bpf_prog_run_array_cg(const struct cgroup_bpf *cgrp, u32 func_ret; run_ctx.retval = retval; - migrate_disable(); - rcu_read_lock(); + rcu_read_lock_dont_migrate(); array = rcu_dereference(cgrp->effective[atype]); item = &array->items[0]; old_run_ctx = bpf_set_run_ctx(&run_ctx.run_ctx); @@ -88,8 +87,7 @@ bpf_prog_run_array_cg(const struct cgroup_bpf *cgrp, item++; } bpf_reset_run_ctx(old_run_ctx); - rcu_read_unlock(); - migrate_enable(); + rcu_read_unlock_migrate(); return run_ctx.retval; } -- 2.50.1
