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Subject[PATCH V4 09/15] perf top: check per-event overwrite term
Date
From: Kan Liang <kan.liang@intel.com>

Per-event overwrite term is not forbidden in perf top, which can bring
problems. Because perf top only support non-overwrite mode now.

Add new rules and check regarding to overwrite term for perf top.
- All events either have same per-event term or don't have per-event
mode setting. Otherwise, it will error out.
- Per-event overwrite term should be consistent as opts->overwrite.
If not, updating the opts->overwrite according to per-event term.

Make it possible to support either non-overwrite or overwrite mode.
The overwrite mode is forbidden now, which will be removed when the
overwrite mode is supported later.

Signed-off-by: Kan Liang <kan.liang@intel.com>
---
tools/perf/builtin-top.c | 73 ++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 73 insertions(+)

diff --git a/tools/perf/builtin-top.c b/tools/perf/builtin-top.c
index c6ccda5..c86eee4 100644
--- a/tools/perf/builtin-top.c
+++ b/tools/perf/builtin-top.c
@@ -881,6 +881,68 @@ static void perf_top__mmap_read(struct perf_top *top)
perf_top__mmap_read_idx(top, i);
}

+/*
+ * Check per-event overwrite term.
+ * perf top should support consistent term for all events.
+ * - All events don't have per-event term
+ * E.g. "cpu/cpu-cycles/,cpu/instructions/"
+ * Nothing change, return 0.
+ * - All events have same per-event term
+ * E.g. "cpu/cpu-cycles,no-overwrite/,cpu/instructions,no-overwrite/
+ * Using the per-event setting to replace the opts->overwrite if
+ * they are different, then return 0.
+ * - Events have different per-event term
+ * E.g. "cpu/cpu-cycles,overwrite/,cpu/instructions,no-overwrite/"
+ * Return -1
+ * - Some of the event set per-event term, but some not.
+ * E.g. "cpu/cpu-cycles/,cpu/instructions,no-overwrite/"
+ * Return -1
+ */
+static int perf_top_overwrite_check(struct perf_top *top)
+{
+ struct record_opts *opts = &top->record_opts;
+ struct perf_evlist *evlist = top->evlist;
+ struct perf_evsel_config_term *term;
+ struct list_head *config_terms;
+ struct perf_evsel *evsel;
+ int set, overwrite = -1;
+
+ evlist__for_each_entry(evlist, evsel) {
+ set = -1;
+ config_terms = &evsel->config_terms;
+ list_for_each_entry(term, config_terms, list) {
+ if (term->type == PERF_EVSEL__CONFIG_TERM_OVERWRITE)
+ set = term->val.overwrite ? 1 : 0;
+ }
+
+ /* no term for current and previous event (likely) */
+ if ((overwrite < 0) && (set < 0))
+ continue;
+
+ /* has term for both current and previous event, compare */
+ if ((overwrite >= 0) && (set >= 0) && (overwrite != set))
+ return -1;
+
+ /* no term for current event but has term for previous one */
+ if ((overwrite >= 0) && (set < 0))
+ return -1;
+
+ /* has term for current event */
+ if ((overwrite < 0) && (set >= 0)) {
+ /* if it's first event, set overwrite */
+ if (evsel == perf_evlist__first(evlist))
+ overwrite = set;
+ else
+ return -1;
+ }
+ }
+
+ if ((overwrite >= 0) && (opts->overwrite != overwrite))
+ opts->overwrite = overwrite;
+
+ return 0;
+}
+
static int perf_top__start_counters(struct perf_top *top)
{
char msg[BUFSIZ];
@@ -888,6 +950,17 @@ static int perf_top__start_counters(struct perf_top *top)
struct perf_evlist *evlist = top->evlist;
struct record_opts *opts = &top->record_opts;

+ if (perf_top_overwrite_check(top)) {
+ ui__error("perf top only support consistent per-event "
+ "overwrite setting for all events\n");
+ goto out_err;
+ }
+
+ if (opts->overwrite) {
+ ui__error("not support overwrite mode yet\n");
+ goto out_err;
+ }
+
perf_evlist__config(evlist, opts, &callchain_param);

evlist__for_each_entry(evlist, counter) {
--
2.5.5
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