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bpf: use rcu_read_lock_dont_migrate() for bpf_prog_run_array_cg()

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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@chinatelecom.cn>
Link: https://lore.kernel.org/r/20250821090609.42508-7-dongml2@chinatelecom.cn
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Menglong Dong 2025-08-21 17:06:08 +08:00 committed by Alexei Starovoitov
parent cf4303b70d
commit 427a36bb55
1 changed files with 2 additions and 4 deletions
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6
kernel/bpf/cgroup.c
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@ -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;
}