From 254de74cd14a2e64323caeffe653de0f390a4e65 Mon Sep 17 00:00:00 2001 From: Jiri Olsa Date: Mon, 5 Nov 2018 21:34:47 +0100 Subject: [PATCH] perf top: Move lost events warning to helpline We can't display the UI box saying that we are slow in the reader thread. That will make 'perf top' even slower and the user even more angry ;-) Move the UI box message from the reader thread to the UI thread and change it to a helpline, so there's no need to 'press any key'. 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-x4k0iuw7tt6mywsaguq6jfwu@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo --- tools/perf/builtin-top.c | 16 +++++----------- 1 file changed, 5 insertions(+), 11 deletions(-) diff --git a/tools/perf/builtin-top.c b/tools/perf/builtin-top.c index c02ea53..9fe835b 100644 --- a/tools/perf/builtin-top.c +++ b/tools/perf/builtin-top.c @@ -553,8 +553,6 @@ static void perf_top__sort_new_samples(void *arg) struct perf_evsel *evsel = t->sym_evsel; struct hists *hists; - perf_top__reset_sample_counters(t); - if (t->evlist->selected != NULL) t->sym_evsel = t->evlist->selected; @@ -571,6 +569,11 @@ static void perf_top__sort_new_samples(void *arg) hists__collapse_resort(hists, NULL); perf_evsel__output_resort(evsel, NULL); + + if (t->lost) + pr_warning("Too slow to read ring buffer (change period (-c/-F) or limit CPUs (-C)\n"); + + perf_top__reset_sample_counters(t); } static void *display_thread_tui(void *arg) @@ -908,10 +911,8 @@ static void perf_top__mmap_read(struct perf_top *top) { bool overwrite = top->record_opts.overwrite; struct perf_evlist *evlist = top->evlist; - unsigned long long start, end; int i; - start = rdclock(); if (overwrite) perf_evlist__toggle_bkw_mmap(evlist, BKW_MMAP_DATA_PENDING); @@ -922,13 +923,6 @@ static void perf_top__mmap_read(struct perf_top *top) perf_evlist__toggle_bkw_mmap(evlist, BKW_MMAP_EMPTY); perf_evlist__toggle_bkw_mmap(evlist, BKW_MMAP_RUNNING); } - end = rdclock(); - - if ((end - start) > (unsigned long long)top->delay_secs * NSEC_PER_SEC) - ui__warning("Too slow to read ring buffer.\n" - "Please try increasing the period (-c) or\n" - "decreasing the freq (-F) or\n" - "limiting the number of CPUs (-C)\n"); } /* -- 2.7.4