From 626af862da9c650e80bdea44684be9334f8eb75b Mon Sep 17 00:00:00 2001 From: Kan Liang Date: Mon, 26 Feb 2018 10:17:10 -0800 Subject: [PATCH] perf top: Fix annoying fallback message on older kernels MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit On older (e.g. v4.4) kernels, an annoying fallback message can be observed in 'perf top': ┌─Warning:──────────────────────┐ │fall back to non-overwrite mode│ │ │ │ │ │Press any key... │ └───────────────────────────────┘ The 'perf top' utility has been changed to overwrite mode since commit ebebbf082357 ("perf top: Switch default mode to overwrite mode"). For older kernels which don't have overwrite mode support, 'perf top' will fall back to non-overwrite mode and print out the fallback message using ui__warning(), which needs user's input to close. The fallback message is not critical for end users. Turning it to debug message which is printed when running with -vv. Reported-by: Ingo Molnar Signed-off-by: Kan Liang Cc: Kan Liang Fixes: ebebbf082357 ("perf top: Switch default mode to overwrite mode") Link: http://lkml.kernel.org/r/1519669030-176549-1-git-send-email-kan.liang@intel.com Signed-off-by: Arnaldo Carvalho de Melo --- tools/perf/builtin-top.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/tools/perf/builtin-top.c b/tools/perf/builtin-top.c index b7c823ba8374..35ac016fcb98 100644 --- a/tools/perf/builtin-top.c +++ b/tools/perf/builtin-top.c @@ -991,7 +991,7 @@ static int perf_top_overwrite_fallback(struct perf_top *top, evlist__for_each_entry(evlist, counter) counter->attr.write_backward = false; opts->overwrite = false; - ui__warning("fall back to non-overwrite mode\n"); + pr_debug2("fall back to non-overwrite mode\n"); return 1; }