From: Peter Zijlstra <[email protected]> Markus reported that 0 should also disable the throttling we per Documentation/sysctl/kernel.txt.
Reported-by: Markus Trippelsdorf <[email protected]> Signed-off-by: Peter Zijlstra (Intel) <[email protected]> Cc: Alexander Shishkin <[email protected]> Cc: Arnaldo Carvalho de Melo <[email protected]> Cc: Jiri Olsa <[email protected]> Cc: Linus Torvalds <[email protected]> Cc: Peter Zijlstra <[email protected]> Cc: Stephane Eranian <[email protected]> Cc: Thomas Gleixner <[email protected]> Cc: Vince Weaver <[email protected]> Fixes: 91a612eea9a3 ("perf/core: Fix dynamic interrupt throttle") Signed-off-by: Ingo Molnar <[email protected]> Signed-off-by: Tan Xiaojun <[email protected]> --- kernel/events/core.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/kernel/events/core.c b/kernel/events/core.c index f96ad76..350c45a 100644 --- a/kernel/events/core.c +++ b/kernel/events/core.c @@ -241,7 +241,8 @@ int perf_cpu_time_max_percent_handler(struct ctl_table *table, int write, if (ret || !write) return ret; - if (sysctl_perf_cpu_time_max_percent == 100) { + if (sysctl_perf_cpu_time_max_percent == 100 || + sysctl_perf_cpu_time_max_percent == 0) { printk(KERN_WARNING "perf: Dynamic interrupt throttling disabled, can hang your system!\n"); WRITE_ONCE(perf_sample_allowed_ns, 0); -- 1.9.1
