Messages in this thread Patch in this message | | | From | wuqiang <> | Subject | [PATCH] kretprobe events missing on 2-core KVM guest | Date | Tue, 25 Oct 2022 18:01:17 +0800 |
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Default value of maxactive is set as num_possible_cpus() for nonpreemptable systems. For a 2-core system, only 2 kretprobe instances would be allocated in default, then these 2 instances for execve kretprobe are very likely to be used up with a pipelined command.
This patch increases the minimum of maxactive to 10.
Signed-off-by: wuqiang <wuqiang.matt@bytedance.com> --- kernel/kprobes.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/kernel/kprobes.c b/kernel/kprobes.c index 3220b0a2fb4a..b781dee3f552 100644 --- a/kernel/kprobes.c +++ b/kernel/kprobes.c @@ -2211,7 +2211,7 @@ int register_kretprobe(struct kretprobe *rp) #ifdef CONFIG_PREEMPTION rp->maxactive = max_t(unsigned int, 10, 2*num_possible_cpus()); #else - rp->maxactive = num_possible_cpus(); + rp->maxactive = max_t(unsigned int, 10, num_possible_cpus()); #endif } #ifdef CONFIG_KRETPROBE_ON_RETHOOK -- 2.34.1
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