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charset=us-ascii Content-Disposition: inline In-Reply-To: X-Url: http://acmel.wordpress.com Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Em Tue, Jul 13, 2021 at 02:11:17PM +0200, Riccardo Mancini escreveu: > This patch adds the workqueue definition, along with simple creation and > destruction functions. > Furthermore, a simple subtest is added. > > A workqueue is attached to a pool, on which it executes its workers. > Next patches will introduce workers. > > Signed-off-by: Riccardo Mancini > --- > tools/perf/tests/workqueue.c | 92 +++++++++++++ > tools/perf/util/workqueue/Build | 1 + > tools/perf/util/workqueue/workqueue.c | 184 ++++++++++++++++++++++++++ > tools/perf/util/workqueue/workqueue.h | 24 ++++ > 4 files changed, 301 insertions(+) > create mode 100644 tools/perf/util/workqueue/workqueue.c > create mode 100644 tools/perf/util/workqueue/workqueue.h > > diff --git a/tools/perf/tests/workqueue.c b/tools/perf/tests/workqueue.c > index 3c64db8203556847..423dc8a92ca2563c 100644 > --- a/tools/perf/tests/workqueue.c > +++ b/tools/perf/tests/workqueue.c > @@ -5,6 +5,7 @@ > #include "tests.h" > #include "util/debug.h" > #include "util/workqueue/threadpool.h" > +#include "util/workqueue/workqueue.h" > > #define DUMMY_FACTOR 100000 > #define N_DUMMY_WORK_SIZES 7 > @@ -13,6 +14,11 @@ struct threadpool_test_args_t { > int pool_size; > }; > > +struct workqueue_test_args_t { > + int pool_size; > + int n_work_items; > +}; > + > struct test_task { > struct task_struct task; > int n_threads; > @@ -140,6 +146,58 @@ static int __test__threadpool(void *_args) > return 0; > } > > + > +static int __workqueue__prepare(struct threadpool_struct **pool, > + struct workqueue_struct **wq, > + int pool_size) > +{ > + int ret; > + > + ret = __threadpool__prepare(pool, pool_size); > + if (ret) > + return ret; > + > + *wq = create_workqueue(*pool); > + TEST_ASSERT_VAL("workqueue creation failure", *wq); > + TEST_ASSERT_VAL("workqueue wrong size", workqueue_nr_threads(*wq) == pool_size); > + TEST_ASSERT_VAL("threadpool is not executing", threadpool_is_busy(*pool)); > + > + return 0; > +} > + > +static int __workqueue__teardown(struct threadpool_struct *pool, > + struct workqueue_struct *wq) > +{ > + int ret; > + > + ret = destroy_workqueue(wq); > + TEST_ASSERT_VAL("workqueue detruction failure", ret == 0); > + > + ret = __threadpool__teardown(pool); > + if (ret) > + return ret; > + > + return 0; > +} > + > +static int __test__workqueue(void *_args) > +{ > + struct workqueue_test_args_t *args = _args; > + struct threadpool_struct *pool; > + struct workqueue_struct *wq; > + int ret; > + > + ret = __workqueue__prepare(&pool, &wq, args->pool_size); > + if (ret) > + return ret; > + > + ret = __workqueue__teardown(pool, wq); > + if (ret) > + return ret; > + > + return 0; > +} > + > static const struct threadpool_test_args_t threadpool_test_args[] = { > { > .pool_size = 1 > @@ -158,6 +216,33 @@ static const struct threadpool_test_args_t threadpool_test_args[] = { > } > }; > > +static const struct workqueue_test_args_t workqueue_test_args[] = { > + { > + .pool_size = 1, > + .n_work_items = 1 > + }, > + { > + .pool_size = 1, > + .n_work_items = 10 > + }, > + { > + .pool_size = 2, > + .n_work_items = 1 > + }, > + { > + .pool_size = 2, > + .n_work_items = 100 > + }, > + { > + .pool_size = 16, > + .n_work_items = 7 > + }, > + { > + .pool_size = 16, > + .n_work_items = 2789 > + } > +}; > + > struct test_case { > const char *desc; > int (*func)(void *args); > @@ -173,6 +258,13 @@ static struct test_case workqueue_testcase_table[] = { > .args = (void *) threadpool_test_args, > .n_args = (int)ARRAY_SIZE(threadpool_test_args), > .arg_size = sizeof(struct threadpool_test_args_t) > + }, > + { > + .desc = "Workqueue", > + .func = __test__workqueue, > + .args = (void *) workqueue_test_args, > + .n_args = (int)ARRAY_SIZE(workqueue_test_args), > + .arg_size = sizeof(struct workqueue_test_args_t) > } > }; > > diff --git a/tools/perf/util/workqueue/Build b/tools/perf/util/workqueue/Build > index 8b72a6cd4e2cba0d..4af721345c0a6bb7 100644 > --- a/tools/perf/util/workqueue/Build > +++ b/tools/perf/util/workqueue/Build > @@ -1 +1,2 @@ > perf-y += threadpool.o > +perf-y += workqueue.o > diff --git a/tools/perf/util/workqueue/workqueue.c b/tools/perf/util/workqueue/workqueue.c > new file mode 100644 > index 0000000000000000..5099252a0662e788 > --- /dev/null > +++ b/tools/perf/util/workqueue/workqueue.c > @@ -0,0 +1,184 @@ > +// SPDX-License-Identifier: GPL-2.0 > +#include > +#include > +#include > +#include > +#include > +#include > +#include > +#include "debug.h" > +#include "workqueue.h" > + > +enum workqueue_status { > + WORKQUEUE_STATUS__READY, /* wq is ready to receive work */ > + WORKQUEUE_STATUS__ERROR, > + WORKQUEUE_STATUS__MAX > +}; > + > +struct workqueue_struct { > + pthread_mutex_t lock; /* locking of the thread_pool */ > + pthread_cond_t idle_cond; /* all workers are idle cond */ > + struct threadpool_struct *pool; /* underlying pool */ > + struct task_struct task; /* threadpool task */ > + struct list_head busy_list; /* busy workers */ > + struct list_head idle_list; /* idle workers */ > + struct list_head pending; /* pending work items */ > + int msg_pipe[2]; /* main thread comm pipes */ > + enum workqueue_status status; > +}; > + > +/** > + * worker_thread - worker function executed on threadpool > + */ > +static void worker_thread(int tidx, struct task_struct *task) > +{ > + struct workqueue_struct *wq = container_of(task, struct workqueue_struct, task); > + > + pr_debug("hi from worker %d. Pool is in status %d\n", tidx, wq->status); > +} > + > +/** > + * attach_threadpool_to_workqueue - start @wq workers on @pool > + */ > +static int attach_threadpool_to_workqueue(struct workqueue_struct *wq, > + struct threadpool_struct *pool) > +{ > + int err; > + > + if (!threadpool_is_ready(pool)) { > + pr_err("workqueue: cannot attach to pool: pool is not ready\n"); > + return -1; > + } > + > + wq->pool = pool; > + > + err = execute_in_threadpool(pool, &wq->task); > + if (err) > + return -1; > + > + return 0; > +} > + > +/** > + * detach_threadpool_from_workqueue - stop @wq workers on @pool > + */ > +static int detach_threadpool_from_workqueue(struct workqueue_struct *wq) > +{ > + int ret, err = 0; > + > + if (wq->status != WORKQUEUE_STATUS__READY) { > + pr_err("workqueue: cannot attach to pool: wq is not ready\n"); > + return -1; > + } > + > + ret = wait_threadpool(wq->pool); > + if (ret) { > + pr_err("workqueue: error waiting threadpool\n"); > + err = -1; > + } > + > + wq->pool = NULL; > + return err; > +} > + > +/** > + * create_workqueue - create a workqueue associated to @pool > + * > + * Only one workqueue can execute on a pool at a time. > + */ > +struct workqueue_struct *create_workqueue(struct threadpool_struct *pool) I wonder if we should use the exact same kernel signature and not pass a threadpool, essentially having just one threadpool in tools/perf/ that is used by create_workqueue(void)? > +{ > + int err; > + struct workqueue_struct *wq = malloc(sizeof(struct workqueue_struct)); > + > + > + err = pthread_mutex_init(&wq->lock, NULL); > + if (err) > + goto out_free_wq; > + > + err = pthread_cond_init(&wq->idle_cond, NULL); > + if (err) > + goto out_destroy_mutex; > + > + wq->pool = NULL; > + INIT_LIST_HEAD(&wq->busy_list); > + INIT_LIST_HEAD(&wq->idle_list); > + > + INIT_LIST_HEAD(&wq->pending); > + > + err = pipe(wq->msg_pipe); > + if (err) > + goto out_destroy_cond; > + > + wq->task.fn = worker_thread; > + > + err = attach_threadpool_to_workqueue(wq, pool); > + if (err) > + goto out_destroy_cond; > + > + wq->status = WORKQUEUE_STATUS__READY; > + > + return wq; > + > +out_destroy_cond: > + pthread_cond_destroy(&wq->idle_cond); > +out_destroy_mutex: > + pthread_mutex_destroy(&wq->lock); > +out_free_wq: > + free(wq); > + return NULL; > +} > + > +/** > + * destroy_workqueue - stop @wq workers and destroy @wq > + */ > +int destroy_workqueue(struct workqueue_struct *wq) > +{ > + int err = 0, ret; > + > + ret = detach_threadpool_from_workqueue(wq); > + if (ret) { > + pr_err("workqueue: error detaching from threadpool.\n"); > + err = -1; > + } > + > + ret = pthread_mutex_destroy(&wq->lock); > + if (ret) { > + err = -1; > + pr_err("workqueue: error pthread_mutex_destroy: %s\n", > + strerror(errno)); > + } > + > + ret = pthread_cond_destroy(&wq->idle_cond); > + if (ret) { > + err = -1; > + pr_err("workqueue: error pthread_cond_destroy: %s\n", > + strerror(errno)); > + } > + > + ret = close(wq->msg_pipe[0]); > + if (ret) { > + err = -1; > + pr_err("workqueue: error close msg_pipe[0]: %s\n", > + strerror(errno)); > + } > + > + ret = close(wq->msg_pipe[1]); > + if (ret) { > + err = -1; > + pr_err("workqueue: error close msg_pipe[1]: %s\n", > + strerror(errno)); > + } > + > + free(wq); > + > + return err; > +} > + > +/** > + * workqueue_nr_threads - get size of threadpool underlying @wq > + */ > +int workqueue_nr_threads(struct workqueue_struct *wq) > +{ > + return threadpool_size(wq->pool); > +} > diff --git a/tools/perf/util/workqueue/workqueue.h b/tools/perf/util/workqueue/workqueue.h > new file mode 100644 > index 0000000000000000..86ec1d69274f41db > --- /dev/null > +++ b/tools/perf/util/workqueue/workqueue.h > @@ -0,0 +1,24 @@ > +/* SPDX-License-Identifier: GPL-2.0 */ > +#ifndef __WORKQUEUE_WORKQUEUE_H > +#define __WORKQUEUE_WORKQUEUE_H > + > +#include > +#include > +#include > +#include "threadpool.h" > + > +struct work_struct; > +typedef void (*work_func_t)(struct work_struct *work); > + > +struct work_struct { > + struct list_head entry; > + work_func_t func; > +}; > + > +struct workqueue_struct; > + > +extern struct workqueue_struct *create_workqueue(struct threadpool_struct *pool); > +extern int destroy_workqueue(struct workqueue_struct *wq); > + > +extern int workqueue_nr_threads(struct workqueue_struct *wq); > +#endif /* __WORKQUEUE_WORKQUEUE_H */ > -- > 2.31.1 > -- - Arnaldo