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perf tools: Add TUI hints for --hybrid-merge

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Add dynamic TUI hints prompting users to restart with --hybrid-merge
when heterogeneous core PMU events are populated in the sample view.

Signed-off-by: Ian Rogers <irogers@google.com>
Assisted-by: Antigravity:gemini-3.1-pro
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Ian Rogers 2026-09-16 22:07:05 -07:00 committed by Arnaldo Carvalho de Melo
parent a25262fb16
commit 59eca52494
2 changed files with 6 additions and 2 deletions
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1
tools/perf/Documentation/tips.txt
View File

@ -67,3 +67,4 @@ For parallelism histogram, try: perf report --hierarchy --sort latency,paralleli
To analyze particular parallelism levels, try: perf report --latency --parallelism=32-64
To see how parallelism changes over time, try: perf report -F time,latency,parallelism --time-quantum=1s
When merging events like cycles, different core frequencies and instructions per cycle mean the counts may not fairly reflect time spent in a function.
Use --hybrid-merge to merge matching events from hybrid cores into one view

7
tools/perf/ui/browsers/hists.c
View File

@ -3580,9 +3580,12 @@ static int perf_evsel_menu__run(struct evsel_menu *menu,
const char *title = "Available samples";
int delay_secs = hbt ? hbt->refresh : 0;
int key;
const char *help_text = "ESC: exit, ENTER|->: Browse histograms";
if (ui_browser__show(&menu->b, title,
"ESC: exit, ENTER|->: Browse histograms") < 0)
if (!symbol_conf.hybrid_merge && evlist__can_merge_hybrid(evlist, menu->env))
help_text = "ESC: exit, ENTER|->: Browse. Try --hybrid-merge to combine events.";
if (ui_browser__show(&menu->b, title, help_text) < 0)
return -1;
while (1) {