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Message-Id: <20210701064253.1175-1-yao.jin@linux.intel.com>
Date: Thu, 1 Jul 2021 14:42:53 +0800
From: Jin Yao <yao.jin@...ux.intel.com>
To: acme@...nel.org, jolsa@...nel.org, peterz@...radead.org,
mingo@...hat.com, alexander.shishkin@...ux.intel.com
Cc: Linux-kernel@...r.kernel.org, ak@...ux.intel.com,
kan.liang@...el.com, yao.jin@...el.com,
Jin Yao <yao.jin@...ux.intel.com>
Subject: [PATCH v3] perf tools: Fix pattern matching for same substring in different pmu type
Some different pmu types may have same substring. For example,
on Icelake server, we have pmu types "uncore_imc" and
"uncore_imc_free_running". Both pmu types have substring "uncore_imc".
But the parser would wrongly think they are the same pmu type.
We enable an imc event,
perf stat -e uncore_imc/event=0xe3/ -a -- sleep 1
Perf actually expands the event to:
uncore_imc_0/event=0xe3/
uncore_imc_1/event=0xe3/
uncore_imc_2/event=0xe3/
uncore_imc_3/event=0xe3/
uncore_imc_4/event=0xe3/
uncore_imc_5/event=0xe3/
uncore_imc_6/event=0xe3/
uncore_imc_7/event=0xe3/
uncore_imc_free_running_0/event=0xe3/
uncore_imc_free_running_1/event=0xe3/
uncore_imc_free_running_3/event=0xe3/
uncore_imc_free_running_4/event=0xe3/
That's because the "uncore_imc_free_running" matches the
pattern "uncore_imc*".
Now we check that the last characters of pmu name is
'_<digit>'.
For example, for pattern "uncore_imc*", "uncore_imc_0" is parsed ok,
but "uncore_imc_free_running_0" would be failed.
Fixes: b2b9d3a3f021 ("perf pmu: Support wildcards on pmu name in dynamic pmu events")
Signed-off-by: Jin Yao <yao.jin@...ux.intel.com>
---
tools/perf/util/parse-events.y | 2 +-
tools/perf/util/pmu.c | 36 +++++++++++++++++++++++++++++++++-
tools/perf/util/pmu.h | 1 +
3 files changed, 37 insertions(+), 2 deletions(-)
diff --git a/tools/perf/util/parse-events.y b/tools/perf/util/parse-events.y
index aba12a4d488e..9321bd0e2f76 100644
--- a/tools/perf/util/parse-events.y
+++ b/tools/perf/util/parse-events.y
@@ -316,7 +316,7 @@ event_pmu_name opt_pmu_config
if (!strncmp(name, "uncore_", 7) &&
strncmp($1, "uncore_", 7))
name += 7;
- if (!fnmatch(pattern, name, 0)) {
+ if (!perf_pmu__match(pattern, name, $1)) {
if (parse_events_copy_term_list(orig_terms, &terms))
CLEANUP_YYABORT;
if (!parse_events_add_pmu(_parse_state, list, pmu->name, terms, true, false))
diff --git a/tools/perf/util/pmu.c b/tools/perf/util/pmu.c
index 88c8ecdc60b0..44b90d638ad5 100644
--- a/tools/perf/util/pmu.c
+++ b/tools/perf/util/pmu.c
@@ -3,6 +3,7 @@
#include <linux/compiler.h>
#include <linux/string.h>
#include <linux/zalloc.h>
+#include <linux/ctype.h>
#include <subcmd/pager.h>
#include <sys/types.h>
#include <errno.h>
@@ -17,6 +18,7 @@
#include <locale.h>
#include <regex.h>
#include <perf/cpumap.h>
+#include <fnmatch.h>
#include "debug.h"
#include "evsel.h"
#include "pmu.h"
@@ -740,6 +742,27 @@ struct pmu_events_map *__weak pmu_events_map__find(void)
return perf_pmu__find_map(NULL);
}
+static bool perf_pmu__valid_suffix(char *pmu_name, char *tok)
+{
+ char *p;
+
+ if (strncmp(pmu_name, tok, strlen(tok)))
+ return false;
+
+ p = pmu_name + strlen(tok);
+ if (*p == 0)
+ return true;
+
+ if (*p != '_')
+ return false;
+
+ ++p;
+ if (*p == 0 || !isdigit(*p))
+ return false;
+
+ return true;
+}
+
bool pmu_uncore_alias_match(const char *pmu_name, const char *name)
{
char *tmp = NULL, *tok, *str;
@@ -768,7 +791,7 @@ bool pmu_uncore_alias_match(const char *pmu_name, const char *name)
*/
for (; tok; name += strlen(tok), tok = strtok_r(NULL, ",", &tmp)) {
name = strstr(name, tok);
- if (!name) {
+ if (!name || !perf_pmu__valid_suffix((char *)name, tok)) {
res = false;
goto out;
}
@@ -1872,3 +1895,14 @@ bool perf_pmu__has_hybrid(void)
return !list_empty(&perf_pmu__hybrid_pmus);
}
+
+int perf_pmu__match(char *pattern, char *name, char *tok)
+{
+ if (fnmatch(pattern, name, 0))
+ return -1;
+
+ if (tok && !perf_pmu__valid_suffix(name, tok))
+ return -1;
+
+ return 0;
+}
diff --git a/tools/perf/util/pmu.h b/tools/perf/util/pmu.h
index a790ef758171..926da483a141 100644
--- a/tools/perf/util/pmu.h
+++ b/tools/perf/util/pmu.h
@@ -133,5 +133,6 @@ void perf_pmu__warn_invalid_config(struct perf_pmu *pmu, __u64 config,
char *name);
bool perf_pmu__has_hybrid(void);
+int perf_pmu__match(char *pattern, char *name, char *tok);
#endif /* __PMU_H */
--
2.17.1
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