linux-kernel - [PATCH v2 13/18] perf top: Update use of pthread mutex

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Date:   Tue, 23 Aug 2022 15:09:17 -0700
From:   Ian Rogers <irogers@...gle.com>
To:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Darren Hart <dvhart@...radead.org>,
        Davidlohr Bueso <dave@...olabs.net>,
        "André Almeida" <andrealmeid@...lia.com>,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Tom Rix <trix@...hat.com>, Weiguo Li <liwg06@...mail.com>,
        Athira Rajeev <atrajeev@...ux.vnet.ibm.com>,
        Thomas Richter <tmricht@...ux.ibm.com>,
        Ravi Bangoria <ravi.bangoria@....com>,
        Dario Petrillo <dario.pk1@...il.com>,
        Hewenliang <hewenliang4@...wei.com>,
        yaowenbin <yaowenbin1@...wei.com>,
        Wenyu Liu <liuwenyu7@...wei.com>,
        Song Liu <songliubraving@...com>,
        Andrii Nakryiko <andrii@...nel.org>,
        Dave Marchevsky <davemarchevsky@...com>,
        Leo Yan <leo.yan@...aro.org>,
        Kim Phillips <kim.phillips@....com>,
        Pavithra Gurushankar <gpavithrasha@...il.com>,
        Alexandre Truong <alexandre.truong@....com>,
        Quentin Monnet <quentin@...valent.com>,
        William Cohen <wcohen@...hat.com>,
        Andres Freund <andres@...razel.de>,
        Adrian Hunter <adrian.hunter@...el.com>,
        "Martin Liška" <mliska@...e.cz>,
        Colin Ian King <colin.king@...el.com>,
        James Clark <james.clark@....com>,
        Fangrui Song <maskray@...gle.com>,
        Stephane Eranian <eranian@...gle.com>,
        Kajol Jain <kjain@...ux.ibm.com>,
        Alexey Bayduraev <alexey.v.bayduraev@...ux.intel.com>,
        Riccardo Mancini <rickyman7@...il.com>,
        Andi Kleen <ak@...ux.intel.com>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Zechuan Chen <chenzechuan1@...wei.com>,
        Jason Wang <wangborong@...rlc.com>,
        Christophe JAILLET <christophe.jaillet@...adoo.fr>,
        Remi Bernon <rbernon@...eweavers.com>,
        linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org,
        bpf@...r.kernel.org, llvm@...ts.linux.dev
Cc:     Ian Rogers <irogers@...gle.com>
Subject: [PATCH v2 13/18] perf top: Update use of pthread mutex

Switch to the use of mutex wrappers that provide better error checking.

Signed-off-by: Ian Rogers <irogers@...gle.com>
---
 tools/perf/builtin-top.c | 18 +++++++++---------
 tools/perf/util/top.h    |  5 +++--
 2 files changed, 12 insertions(+), 11 deletions(-)

diff --git a/tools/perf/builtin-top.c b/tools/perf/builtin-top.c
index b96bb9a23ac0..3757292bfe86 100644
--- a/tools/perf/builtin-top.c
+++ b/tools/perf/builtin-top.c
@@ -893,10 +893,10 @@ static void perf_top__mmap_read_idx(struct perf_top *top, int idx)
 		perf_mmap__consume(&md->core);
 
 		if (top->qe.rotate) {
-			pthread_mutex_lock(&top->qe.mutex);
+			mutex_lock(&top->qe.mutex);
 			top->qe.rotate = false;
-			pthread_cond_signal(&top->qe.cond);
-			pthread_mutex_unlock(&top->qe.mutex);
+			cond_signal(&top->qe.cond);
+			mutex_unlock(&top->qe.mutex);
 		}
 	}
 
@@ -1100,10 +1100,10 @@ static void *process_thread(void *arg)
 
 		out = rotate_queues(top);
 
-		pthread_mutex_lock(&top->qe.mutex);
+		mutex_lock(&top->qe.mutex);
 		top->qe.rotate = true;
-		pthread_cond_wait(&top->qe.cond, &top->qe.mutex);
-		pthread_mutex_unlock(&top->qe.mutex);
+		cond_wait(&top->qe.cond, &top->qe.mutex);
+		mutex_unlock(&top->qe.mutex);
 
 		if (ordered_events__flush(out, OE_FLUSH__TOP))
 			pr_err("failed to process events\n");
@@ -1217,8 +1217,8 @@ static void init_process_thread(struct perf_top *top)
 	ordered_events__set_copy_on_queue(&top->qe.data[0], true);
 	ordered_events__set_copy_on_queue(&top->qe.data[1], true);
 	top->qe.in = &top->qe.data[0];
-	pthread_mutex_init(&top->qe.mutex, NULL);
-	pthread_cond_init(&top->qe.cond, NULL);
+	mutex_init(&top->qe.mutex, /*pshared=*/false);
+	cond_init(&top->qe.cond, /*pshared=*/false);
 }
 
 static int __cmd_top(struct perf_top *top)
@@ -1349,7 +1349,7 @@ static int __cmd_top(struct perf_top *top)
 out_join:
 	pthread_join(thread, NULL);
 out_join_thread:
-	pthread_cond_signal(&top->qe.cond);
+	cond_signal(&top->qe.cond);
 	pthread_join(thread_process, NULL);
 	return ret;
 }
diff --git a/tools/perf/util/top.h b/tools/perf/util/top.h
index 1c2c0a838430..a8b0d79bd96c 100644
--- a/tools/perf/util/top.h
+++ b/tools/perf/util/top.h
@@ -5,6 +5,7 @@
 #include "tool.h"
 #include "evswitch.h"
 #include "annotate.h"
+#include "mutex.h"
 #include "ordered-events.h"
 #include "record.h"
 #include <linux/types.h>
@@ -53,8 +54,8 @@ struct perf_top {
 		struct ordered_events	*in;
 		struct ordered_events	 data[2];
 		bool			 rotate;
-		pthread_mutex_t		 mutex;
-		pthread_cond_t		 cond;
+		struct mutex mutex;
+		struct cond cond;
 	} qe;
 };
 
-- 
2.37.2.609.g9ff673ca1a-goog