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perf top: Lift restriction on using callchains without "sym" in --sort

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This restriction is not present in 'perf report' and since 'perf top'
uses the same hists browser, remove it from it as well.

With this we create per event buckets with callchain trees, so that

  # perf top --sort dso -g --no-children

Bucketizes samples by DSO and below it shows the callchains leading to
functions in this DSO.

Try also:

  # perf top -e sched:*switch -g --no-children

To see the callchains leading to sched switches, pressing 'E' to expand
all one can quickly see the most common scheduler switches and what
leads to them, for instance, calls to IO, futexes, etc.

Acked-by: Namhyung Kim <namhyung@kernel.org>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Link: https://lkml.kernel.org/r/20190107140854.GA28965@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Arnaldo Carvalho de Melo 2019-01-08 10:56:59 -03:00
parent 9231967e2f
commit f2e14cd2c9
1 changed files with 1 additions and 6 deletions
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7
tools/perf/builtin-top.c
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@ -1028,12 +1028,7 @@ static int perf_top__start_counters(struct perf_top *top)
static int callchain_param__setup_sample_type(struct callchain_param *callchain)
{
if (!perf_hpp_list.sym) {
if (callchain->enabled) {
ui__error("Selected -g but \"sym\" not present in --sort/-s.");
return -EINVAL;
}
} else if (callchain->mode != CHAIN_NONE) {
if (callchain->mode != CHAIN_NONE) {
if (callchain_register_param(callchain) < 0) {
ui__error("Can't register callchain params.\n");
return -EINVAL;