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authorPeter Zijlstra <peterz@infradead.org>2017-03-06 15:14:24 +0800
committerSasha Levin <alexander.levin@verizon.com>2017-03-06 17:31:15 -0500
commit99e7444514783d1f2653c661ab505a628c09dab7 (patch)
tree182614b48209b8a5fa0e71744b57b221d3df3699 /kernel
parent19de2ea4b733604ba0e6a8933b396350f0339346 (diff)
perf/core: Make sysctl_perf_cpu_time_max_percent conform to documentation
Markus reported that 0 should also disable the throttling we per Documentation/sysctl/kernel.txt. Reported-by: Markus Trippelsdorf <markus@trippelsdorf.de> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Stephane Eranian <eranian@google.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Vince Weaver <vincent.weaver@maine.edu> Fixes: 91a612eea9a3 ("perf/core: Fix dynamic interrupt throttle") Signed-off-by: Ingo Molnar <mingo@kernel.org> Signed-off-by: Tan Xiaojun <tanxiaojun@huawei.com> Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/events/core.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/kernel/events/core.c b/kernel/events/core.c
index 338362db17d1..240f2bbe6d3e 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);