From: Riccardo Mancini <rickyman7@gmail.com>
To: Arnaldo Carvalho de Melo <acme@kernel.org>
Cc: Ian Rogers <irogers@google.com>,
Namhyung Kim <namhyung@kernel.org>,
Peter Zijlstra <peterz@infradead.org>,
Ingo Molnar <mingo@redhat.com>,
Mark Rutland <mark.rutland@arm.com>, Jiri Olsa <jolsa@redhat.com>,
linux-kernel@vger.kernel.org, linux-perf-users@vger.kernel.org,
Riccardo Mancini <rickyman7@gmail.com>,
Alexey Bayduraev <alexey.v.bayduraev@linux.intel.com>
Subject: [RFC PATCH 03/10] perf workqueue: add threadpool start and stop functions
Date: Tue, 13 Jul 2021 14:11:14 +0200 [thread overview]
Message-ID: <118c988358322b9daf69aeb98ff8986748b0dad2.1626177381.git.rickyman7@gmail.com> (raw)
In-Reply-To: <cover.1626177381.git.rickyman7@gmail.com>
This patch adds the start and stop functions, alongside the thread
function.
Each thread will run until a stop signal is received.
Furthermore, start and stop are added to the test.
Thread management is based on the prototype from Alexey:
https://lore.kernel.org/lkml/cover.1625227739.git.alexey.v.bayduraev@linux.intel.com/
Suggested-by: Alexey Bayduraev <alexey.v.bayduraev@linux.intel.com>
Signed-off-by: Riccardo Mancini <rickyman7@gmail.com>
---
tools/perf/tests/workqueue.c | 13 ++
tools/perf/util/workqueue/threadpool.c | 238 +++++++++++++++++++++++++
tools/perf/util/workqueue/threadpool.h | 5 +
3 files changed, 256 insertions(+)
diff --git a/tools/perf/tests/workqueue.c b/tools/perf/tests/workqueue.c
index 1bd4d78c13eb3b14..be377e9897bab4e9 100644
--- a/tools/perf/tests/workqueue.c
+++ b/tools/perf/tests/workqueue.c
@@ -10,16 +10,29 @@ struct threadpool_test_args_t {
static int __threadpool__prepare(struct threadpool_struct **pool, int pool_size)
{
+ int ret;
+
*pool = create_threadpool(pool_size);
TEST_ASSERT_VAL("threadpool creation failure", *pool != NULL);
TEST_ASSERT_VAL("threadpool size is wrong",
threadpool_size(*pool) == pool_size);
+ ret = start_threadpool(*pool);
+ TEST_ASSERT_VAL("threadpool start failure", ret == 0);
+ TEST_ASSERT_VAL("threadpool is not ready", threadpool_is_ready(*pool));
+
return 0;
}
static int __threadpool__teardown(struct threadpool_struct *pool)
{
+ int ret;
+
+ ret = stop_threadpool(pool);
+ TEST_ASSERT_VAL("threadpool start failure", ret == 0);
+ TEST_ASSERT_VAL("stopped threadpool is ready",
+ !threadpool_is_ready(pool));
+
destroy_threadpool(pool);
return 0;
diff --git a/tools/perf/util/workqueue/threadpool.c b/tools/perf/util/workqueue/threadpool.c
index 70c67569f956a3e2..f4635ff782b9388e 100644
--- a/tools/perf/util/workqueue/threadpool.c
+++ b/tools/perf/util/workqueue/threadpool.c
@@ -4,12 +4,23 @@
#include <unistd.h>
#include <errno.h>
#include <string.h>
+#include <pthread.h>
+#include <signal.h>
+#include <syscall.h>
#include "debug.h"
#include "asm/bug.h"
#include "threadpool.h"
+#ifndef HAVE_GETTID
+static inline pid_t gettid(void)
+{
+ return (pid_t)syscall(__NR_gettid);
+}
+#endif
+
enum threadpool_status {
THREADPOOL_STATUS__STOPPED, /* no threads */
+ THREADPOOL_STATUS__READY, /* threads are ready but idle */
THREADPOOL_STATUS__ERROR, /* errors */
THREADPOOL_STATUS__MAX
};
@@ -31,6 +42,21 @@ struct thread_struct {
} pipes;
};
+enum thread_msg {
+ THREAD_MSG__UNDEFINED = 0,
+ THREAD_MSG__ACK, /* from th: create and exit ack */
+ THREAD_MSG__WAKE, /* to th: wake up */
+ THREAD_MSG__STOP, /* to th: exit */
+ THREAD_MSG__MAX
+};
+
+static const char * const thread_msg_tags[] = {
+ "undefined",
+ "ack",
+ "wake",
+ "stop"
+};
+
/**
* init_pipes - initialize all pipes of @thread
*/
@@ -89,6 +115,113 @@ static void close_pipes(struct thread_struct *thread)
}
}
+/**
+ * wait_thread - receive ack from thread
+ *
+ * NB: call only from main thread!
+ */
+static int wait_thread(struct thread_struct *thread)
+{
+ int res;
+ enum thread_msg msg = THREAD_MSG__UNDEFINED;
+
+ res = read(thread->pipes.from[0], &msg, sizeof(msg));
+ if (res < 0) {
+ pr_err("threadpool: failed to recv msg from tid=%d: %s\n",
+ thread->tid, strerror(errno));
+ return -1;
+ }
+ if (msg != THREAD_MSG__ACK) {
+ pr_err("threadpool: received unexpected msg from tid=%d: %s\n",
+ thread->tid, thread_msg_tags[msg]);
+ return -1;
+ }
+
+ pr_debug2("threadpool: received ack from tid=%d\n", thread->tid);
+
+ return 0;
+}
+
+/**
+ * terminate_thread - send stop signal to thread and wait for ack
+ *
+ * NB: call only from main thread!
+ */
+static int terminate_thread(struct thread_struct *thread)
+{
+ int res;
+ enum thread_msg msg = THREAD_MSG__STOP;
+
+ res = write(thread->pipes.to[1], &msg, sizeof(msg));
+ if (res < 0) {
+ pr_err("threadpool: error sending stop msg to tid=%d: %s\n",
+ thread->tid, strerror(errno));
+ return res;
+ }
+
+ res = wait_thread(thread);
+
+ return res;
+}
+
+/**
+ * threadpool_thread - function running on thread
+ *
+ * This function waits for a signal from main thread to start executing
+ * a task.
+ * On completion, it will go back to sleep, waiting for another signal.
+ * Signals are delivered through pipes.
+ */
+static void *threadpool_thread(void *args)
+{
+ struct thread_struct *thread = (struct thread_struct *) args;
+ enum thread_msg msg;
+ int err;
+
+ thread->tid = gettid();
+
+ pr_debug2("threadpool[%d]: started\n", thread->tid);
+
+ for (;;) {
+ msg = THREAD_MSG__ACK;
+ err = write(thread->pipes.from[1], &msg, sizeof(msg));
+ if (err == -1) {
+ pr_err("threadpool[%d]: failed to send ack: %s\n",
+ thread->tid, strerror(errno));
+ break;
+ }
+
+ msg = THREAD_MSG__UNDEFINED;
+ err = read(thread->pipes.to[0], &msg, sizeof(msg));
+ if (err < 0) {
+ pr_err("threadpool[%d]: error receiving msg: %s\n",
+ thread->tid, strerror(errno));
+ break;
+ }
+
+ if (msg != THREAD_MSG__WAKE && msg != THREAD_MSG__STOP) {
+ pr_err("threadpool[%d]: received unexpected msg: %s\n",
+ thread->tid, thread_msg_tags[msg]);
+ break;
+ }
+
+ if (msg == THREAD_MSG__STOP)
+ break;
+ }
+
+ pr_debug2("threadpool[%d]: exit\n", thread->tid);
+
+ msg = THREAD_MSG__ACK;
+ err = write(thread->pipes.from[1], &msg, sizeof(msg));
+ if (err == -1) {
+ pr_err("threadpool[%d]: failed to send ack: %s\n",
+ thread->tid, strerror(errno));
+ return NULL;
+ }
+
+ return NULL;
+}
+
/**
* create_threadpool - create a fixed threadpool with @n_threads threads
*/
@@ -173,3 +306,108 @@ int threadpool_size(struct threadpool_struct *pool)
{
return pool->nr_threads;
}
+
+/**
+ * __start_threadpool - start all threads in the pool.
+ *
+ * This function does not change @pool->status.
+ */
+static int __start_threadpool(struct threadpool_struct *pool)
+{
+ int t, tt, ret = 0, nr_threads = pool->nr_threads;
+ sigset_t full, mask;
+ pthread_t handle;
+ pthread_attr_t attrs;
+
+ sigfillset(&full);
+ if (sigprocmask(SIG_SETMASK, &full, &mask)) {
+ pr_err("Failed to block signals on threads start: %s\n",
+ strerror(errno));
+ return -1;
+ }
+
+ pthread_attr_init(&attrs);
+ pthread_attr_setdetachstate(&attrs, PTHREAD_CREATE_DETACHED);
+
+ for (t = 0; t < nr_threads; t++) {
+ struct thread_struct *thread = &pool->threads[t];
+
+ if (pthread_create(&handle, &attrs, threadpool_thread, thread)) {
+ for (tt = 1; tt < t; tt++)
+ terminate_thread(thread);
+ pr_err("Failed to start threads: %s\n", strerror(errno));
+ ret = -1;
+ goto out_free_attr;
+ }
+
+ if (wait_thread(thread)) {
+ for (tt = 1; tt <= t; tt++)
+ terminate_thread(thread);
+ ret = -1;
+ goto out_free_attr;
+ }
+ }
+
+out_free_attr:
+ pthread_attr_destroy(&attrs);
+
+ if (sigprocmask(SIG_SETMASK, &mask, NULL)) {
+ pr_err("Failed to unblock signals on threads start: %s\n",
+ strerror(errno));
+ ret = -1;
+ }
+
+ return ret;
+}
+
+/**
+ * start_threadpool - start all threads in the pool.
+ *
+ * The function blocks until all threads are up and running.
+ */
+int start_threadpool(struct threadpool_struct *pool)
+{
+ int err;
+
+ if (pool->status != THREADPOOL_STATUS__STOPPED) {
+ pr_err("threadpool: starting not stopped pool\n");
+ return -1;
+ }
+
+ err = __start_threadpool(pool);
+ pool->status = err ? THREADPOOL_STATUS__ERROR : THREADPOOL_STATUS__READY;
+ return err;
+}
+
+/**
+ * stop_threadpool - stop all threads in the pool.
+ *
+ * This function blocks waiting for ack from all threads.
+ */
+int stop_threadpool(struct threadpool_struct *pool)
+{
+ int t, ret, err = 0;
+
+ if (pool->status != THREADPOOL_STATUS__READY) {
+ pr_err("threadpool: stopping not ready pool\n");
+ return -1;
+ }
+
+ for (t = 0; t < pool->nr_threads; t++) {
+ ret = terminate_thread(&pool->threads[t]);
+ if (ret && !err)
+ err = -1;
+ }
+
+ pool->status = err ? THREADPOOL_STATUS__ERROR : THREADPOOL_STATUS__STOPPED;
+
+ return err;
+}
+
+/**
+ * threadpool_is_ready - check if the threads are running
+ */
+bool threadpool_is_ready(struct threadpool_struct *pool)
+{
+ return pool->status == THREADPOOL_STATUS__READY;
+}
diff --git a/tools/perf/util/workqueue/threadpool.h b/tools/perf/util/workqueue/threadpool.h
index 2b9388c768a0b588..b62cad2b2c5dd331 100644
--- a/tools/perf/util/workqueue/threadpool.h
+++ b/tools/perf/util/workqueue/threadpool.h
@@ -14,6 +14,11 @@ struct task_struct {
extern struct threadpool_struct *create_threadpool(int n_threads);
extern void destroy_threadpool(struct threadpool_struct *pool);
+extern int start_threadpool(struct threadpool_struct *pool);
+extern int stop_threadpool(struct threadpool_struct *pool);
+
extern int threadpool_size(struct threadpool_struct *pool);
+extern bool threadpool_is_ready(struct threadpool_struct *pool);
+
#endif /* __WORKQUEUE_THREADPOOL_H */
--
2.31.1
next prev parent reply other threads:[~2021-07-13 12:11 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-07-13 12:11 [RFC PATCH 00/10] perf: add workqueue library and use it in synthetic-events Riccardo Mancini
2021-07-13 12:11 ` [RFC PATCH 01/10] perf workqueue: threadpool creation and destruction Riccardo Mancini
2021-07-14 14:16 ` Arnaldo Carvalho de Melo
2021-07-15 16:31 ` Riccardo Mancini
2021-07-15 20:48 ` Arnaldo Carvalho de Melo
2021-07-15 23:29 ` Namhyung Kim
2021-07-16 13:36 ` Riccardo Mancini
2021-07-19 19:39 ` Namhyung Kim
2021-07-13 12:11 ` [RFC PATCH 02/10] perf tests: add test for workqueue Riccardo Mancini
2021-07-14 15:10 ` Arnaldo Carvalho de Melo
2021-07-15 16:33 ` Riccardo Mancini
2021-07-13 12:11 ` Riccardo Mancini [this message]
2021-07-14 15:15 ` [RFC PATCH 03/10] perf workqueue: add threadpool start and stop functions Arnaldo Carvalho de Melo
2021-07-15 16:42 ` Riccardo Mancini
2021-07-15 20:43 ` Arnaldo Carvalho de Melo
2021-07-15 23:48 ` Namhyung Kim
2021-07-16 13:53 ` Riccardo Mancini
2021-07-16 16:29 ` Arnaldo Carvalho de Melo
2021-07-13 12:11 ` [RFC PATCH 04/10] perf workqueue: add threadpool execute and wait functions Riccardo Mancini
2021-07-15 23:56 ` Namhyung Kim
2021-07-16 13:55 ` Riccardo Mancini
2021-07-13 12:11 ` [RFC PATCH 05/10] perf workqueue: add sparse annotation header Riccardo Mancini
2021-07-13 12:11 ` [RFC PATCH 06/10] perf workqueue: introduce workqueue struct Riccardo Mancini
2021-07-14 15:22 ` Arnaldo Carvalho de Melo
2021-07-15 16:49 ` Riccardo Mancini
2021-07-15 20:47 ` Arnaldo Carvalho de Melo
2021-07-13 12:11 ` [RFC PATCH 07/10] perf workqueue: implement worker thread and management Riccardo Mancini
2021-07-13 12:11 ` [RFC PATCH 08/10] perf workqueue: add queue_work and flush_workqueue functions Riccardo Mancini
2021-07-13 12:11 ` [RFC PATCH 09/10] perf workqueue: add utility to execute a for loop in parallel Riccardo Mancini
2021-07-13 12:11 ` [RFC PATCH 10/10] perf synthetic-events: use workqueue parallel_for Riccardo Mancini
2021-07-13 19:14 ` [RFC PATCH 00/10] perf: add workqueue library and use it in synthetic-events Arnaldo Carvalho de Melo
2021-07-19 21:13 ` Jiri Olsa
2021-07-22 16:15 ` Riccardo Mancini
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