linux-kernel - [PATCH 1/7] perf lock contention: Simplify parse_lock

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Date:   Thu,  6 Apr 2023 14:06:05 -0700
From:   Namhyung Kim <namhyung@...nel.org>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        Jiri Olsa <jolsa@...nel.org>
Cc:     Ian Rogers <irogers@...gle.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        linux-perf-users@...r.kernel.org, Song Liu <song@...nel.org>,
        Hao Luo <haoluo@...gle.com>, bpf@...r.kernel.org,
        Juri Lelli <juri.lelli@...hat.com>
Subject: [PATCH 1/7] perf lock contention: Simplify parse_lock_type()

The get_type_flag() should check both str and name fields in the
lock_type_table so that it can find the appropriate flag without retrying
with ':R' or ':W' suffix from the caller.

Also fix a typo in the rt-mutex.

Signed-off-by: Namhyung Kim <namhyung@...nel.org>
---
 tools/perf/builtin-lock.c | 43 ++++++++-------------------------------
 1 file changed, 8 insertions(+), 35 deletions(-)

diff --git a/tools/perf/builtin-lock.c b/tools/perf/builtin-lock.c
index 32ec58fb80e4..695ce6bd64f7 100644
--- a/tools/perf/builtin-lock.c
+++ b/tools/perf/builtin-lock.c
@@ -1557,7 +1557,7 @@ static const struct {
 	{ LCB_F_SPIN | LCB_F_WRITE,	"rwlock:W",	"rwlock" },
 	{ LCB_F_READ,			"rwsem:R",	"rwsem" },
 	{ LCB_F_WRITE,			"rwsem:W",	"rwsem" },
-	{ LCB_F_RT,			"rt=mutex",	"rt-mutex" },
+	{ LCB_F_RT,			"rt-mutex",	"rt-mutex" },
 	{ LCB_F_RT | LCB_F_READ,	"rwlock-rt:R",	"rwlock-rt" },
 	{ LCB_F_RT | LCB_F_WRITE,	"rwlock-rt:W",	"rwlock-rt" },
 	{ LCB_F_PERCPU | LCB_F_READ,	"pcpu-sem:R",	"percpu-rwsem" },
@@ -1596,6 +1596,10 @@ static unsigned int get_type_flag(const char *str)
 		if (!strcmp(lock_type_table[i].name, str))
 			return lock_type_table[i].flags;
 	}
+	for (unsigned int i = 0; i < ARRAY_SIZE(lock_type_table); i++) {
+		if (!strcmp(lock_type_table[i].str, str))
+			return lock_type_table[i].flags;
+	}
 	return UINT_MAX;
 }
 
@@ -2121,46 +2125,15 @@ static int parse_lock_type(const struct option *opt __maybe_unused, const char *
 		unsigned int flags = get_type_flag(tok);
 
 		if (flags == -1U) {
-			char buf[32];
-
-			if (strchr(tok, ':'))
-			    continue;
-
-			/* try :R and :W suffixes for rwlock, rwsem, ... */
-			scnprintf(buf, sizeof(buf), "%s:R", tok);
-			flags = get_type_flag(buf);
-			if (flags != UINT_MAX) {
-				if (!add_lock_type(flags)) {
-					ret = -1;
-					break;
-				}
-			}
-
-			scnprintf(buf, sizeof(buf), "%s:W", tok);
-			flags = get_type_flag(buf);
-			if (flags != UINT_MAX) {
-				if (!add_lock_type(flags)) {
-					ret = -1;
-					break;
-				}
-			}
-			continue;
+			pr_err("Unknown lock flags: %s\n", tok);
+			ret = -1;
+			break;
 		}
 
 		if (!add_lock_type(flags)) {
 			ret = -1;
 			break;
 		}
-
-		if (!strcmp(tok, "mutex")) {
-			flags = get_type_flag("mutex-spin");
-			if (flags != UINT_MAX) {
-				if (!add_lock_type(flags)) {
-					ret = -1;
-					break;
-				}
-			}
-		}
 	}
 
 	free(s);
-- 
2.40.0.577.gac1e443424-goog