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-rw-r--r--tools/perf/Documentation/perf-stat.txt2
-rw-r--r--tools/perf/builtin-stat.c14
2 files changed, 3 insertions, 13 deletions
diff --git a/tools/perf/Documentation/perf-stat.txt b/tools/perf/Documentation/perf-stat.txt
index f15b306be183..e6c3b4e555c2 100644
--- a/tools/perf/Documentation/perf-stat.txt
+++ b/tools/perf/Documentation/perf-stat.txt
@@ -153,7 +153,7 @@ perf stat --repeat 10 --null --sync --pre 'make -s O=defconfig-build/clean' -- m
-I msecs::
--interval-print msecs::
-Print count deltas every N milliseconds (minimum: 10ms)
+Print count deltas every N milliseconds (minimum: 1ms)
The overhead percentage could be high in some cases, for instance with small, sub 100ms intervals. Use with caution.
example: 'perf stat -I 1000 -e cycles -a sleep 5'
diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c
index f5c454855908..147a27e8c937 100644
--- a/tools/perf/builtin-stat.c
+++ b/tools/perf/builtin-stat.c
@@ -1943,7 +1943,8 @@ static const struct option stat_options[] = {
OPT_STRING(0, "post", &post_cmd, "command",
"command to run after to the measured command"),
OPT_UINTEGER('I', "interval-print", &stat_config.interval,
- "print counts at regular interval in ms (>= 10)"),
+ "print counts at regular interval in ms "
+ "(overhead is possible for values <= 100ms)"),
OPT_INTEGER(0, "interval-count", &stat_config.times,
"print counts for fixed number of times"),
OPT_UINTEGER(0, "timeout", &stat_config.timeout,
@@ -2923,17 +2924,6 @@ int cmd_stat(int argc, const char **argv)
}
}
- if (interval && interval < 100) {
- if (interval < 10) {
- pr_err("print interval must be >= 10ms\n");
- parse_options_usage(stat_usage, stat_options, "I", 1);
- goto out;
- } else
- pr_warning("print interval < 100ms. "
- "The overhead percentage could be high in some cases. "
- "Please proceed with caution.\n");
- }
-
if (stat_config.times && interval)
interval_count = true;
else if (stat_config.times && !interval) {