From 6547250381eb315acff3d52b4872ad775359407c Mon Sep 17 00:00:00 2001 From: Jiri Olsa <jolsa@redhat.com> Date: Mon, 7 Mar 2011 21:13:41 +0100 Subject: [PATCH] perf top: Don't let events to eat up whole header line Passing multiple events might force out information about pid/tid/cpu. Attached patch leaves 30 characters for this info at the expense of the events' names. Cc: Ingo Molnar <mingo@elte.hu> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Han Pingtian <phan@redhat.com> LKML-Reference: <1299528821-17521-3-git-send-email-jolsa@redhat.com> Signed-off-by: Jiri Olsa <jolsa@redhat.com> Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com> --- tools/perf/util/top.c | 20 +++++++++++++++++--- 1 file changed, 17 insertions(+), 3 deletions(-) diff --git a/tools/perf/util/top.c b/tools/perf/util/top.c index 4f869da4e9c..75cfe4d4511 100644 --- a/tools/perf/util/top.c +++ b/tools/perf/util/top.c @@ -115,9 +115,23 @@ size_t perf_top__header_snprintf(struct perf_top *top, char *bf, size_t size) if (!top->display_weighted) { ret += SNPRINTF(bf + ret, size - ret, "%s", event_name(top->sym_evsel)); - } else list_for_each_entry(counter, &top->evlist->entries, node) { - ret += SNPRINTF(bf + ret, size - ret, "%s%s", - counter->idx ? "/" : "", event_name(counter)); + } else { + /* + * Don't let events eat all the space. Leaving 30 bytes + * for the rest should be enough. + */ + size_t last_pos = size - 30; + + list_for_each_entry(counter, &top->evlist->entries, node) { + ret += SNPRINTF(bf + ret, size - ret, "%s%s", + counter->idx ? "/" : "", + event_name(counter)); + if (ret > last_pos) { + sprintf(bf + last_pos - 3, ".."); + ret = last_pos - 1; + break; + } + } } ret += SNPRINTF(bf + ret, size - ret, "], "); -- 2.20.1