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From: Pavel Begunkov <asml.silence@gmail.com>
To: Jens Axboe <axboe@kernel.dk>,
	io-uring@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: [PATCH 1/2] tasks: add put_task_struct_many()
Date: Sat, 18 Jul 2020 11:32:51 +0300
Message-ID: <320e500c71a4c10e34e0513d31c74919035e42d1.1595021626.git.asml.silence@gmail.com> (raw)
In-Reply-To: <cover.1595021626.git.asml.silence@gmail.com>

put_task_struct_many() is as put_task_struct() but puts several
references at once. Useful to batching it.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
---
 include/linux/sched/task.h | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/include/linux/sched/task.h b/include/linux/sched/task.h
index 38359071236a..1301077f9c24 100644
--- a/include/linux/sched/task.h
+++ b/include/linux/sched/task.h
@@ -126,6 +126,12 @@ static inline void put_task_struct(struct task_struct *t)
 		__put_task_struct(t);
 }
 
+static inline void put_task_struct_many(struct task_struct *t, int nr)
+{
+	if (refcount_sub_and_test(nr, &t->usage))
+		__put_task_struct(t);
+}
+
 void put_task_struct_rcu_user(struct task_struct *task);
 
 #ifdef CONFIG_ARCH_WANTS_DYNAMIC_TASK_STRUCT
-- 
2.24.0


  reply index

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-07-18  8:32 [PATCH 0/2] task_put batching Pavel Begunkov
2020-07-18  8:32 ` Pavel Begunkov [this message]
2020-07-18  8:32 ` [PATCH 2/2] io_uring: batch put_task_struct() Pavel Begunkov
2020-07-18 14:37 ` [PATCH 0/2] task_put batching Jens Axboe
2020-07-19 11:15   ` Pavel Begunkov
2020-07-19 18:49     ` Jens Axboe
2020-07-20 14:18       ` Pavel Begunkov
2020-07-20 15:22   ` Pavel Begunkov
2020-07-20 15:49     ` Jens Axboe
2020-07-20 16:06       ` Pavel Begunkov
2020-07-20 16:11         ` Jens Axboe
2020-07-20 16:42           ` Pavel Begunkov

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