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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 <jolsa@kernel.org>
Acked-by: David S. Miller <davem@davemloft.net>
Acked-by: Namhyung Kim <namhyung@kernel.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: https://lkml.kernel.org/n/tip-bnev2mloavyurmgchcr3o24o@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Jiri Olsa 2018-11-19 11:12:01 +01:00 committed by Arnaldo Carvalho de Melo
parent 97f7e0b33d
commit d8590430fb
1 changed files with 1 additions and 1 deletions
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2
tools/perf/builtin-top.c
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@ -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);