From d8590430fb1e70132f1d330d6bbab7b943b35c3c Mon Sep 17 00:00:00 2001 From: Jiri Olsa Date: Mon, 19 Nov 2018 11:12:01 +0100 Subject: [PATCH] perf top: Display slow reader warning when droping samples Currently we display the "Too slow to read ring buffer.." helpline only in the slow reader thread. This patch triggers it also when the processing thread drops samples, because it has the same reason, which is too many data on input. Signed-off-by: Jiri Olsa Acked-by: David S. Miller Acked-by: Namhyung Kim Cc: Alexander Shishkin Cc: Peter Zijlstra Link: https://lkml.kernel.org/n/tip-bnev2mloavyurmgchcr3o24o@git.kernel.org 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 9166f6087e3f..f22c531be366 100644 --- a/tools/perf/builtin-top.c +++ b/tools/perf/builtin-top.c @@ -571,7 +571,7 @@ static void perf_top__sort_new_samples(void *arg) hists__collapse_resort(hists, NULL); perf_evsel__output_resort(evsel, NULL); - if (t->lost) + if (t->lost || t->drop) pr_warning("Too slow to read ring buffer (change period (-c/-F) or limit CPUs (-C)\n"); perf_top__reset_sample_counters(t);