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From: Mateusz Guzik <mjguzik@gmail.com>
To: ebiederm@xmission.com, oleg@redhat.com
Cc: brauner@kernel.org, akpm@linux-foundation.org,
	Liam.Howlett@oracle.com, linux-mm@kvack.org,
	linux-kernel@vger.kernel.org, Mateusz Guzik <mjguzik@gmail.com>
Subject: [PATCH v4 1/5] exit: perform add_device_randomness() without tasklist_lock
Date: Wed,  5 Feb 2025 20:32:17 +0100	[thread overview]
Message-ID: <20250205193221.402150-2-mjguzik@gmail.com> (raw)
In-Reply-To: <20250205193221.402150-1-mjguzik@gmail.com>

Parallel calls to add_device_randomness() contend on their own.

The clone side aleady runs outside of tasklist_lock, which in turn means
any caller on the exit side extends the tasklist_lock hold time while
contending on the random-private lock.

Reviewed-by: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Mateusz Guzik <mjguzik@gmail.com>
---
 kernel/exit.c                         |   6 +++---
 scripts/selinux/genheaders/genheaders | Bin 90112 -> 0 bytes
 2 files changed, 3 insertions(+), 3 deletions(-)
 delete mode 100755 scripts/selinux/genheaders/genheaders

diff --git a/kernel/exit.c b/kernel/exit.c
index 3485e5fc499e..c79b41509cd3 100644
--- a/kernel/exit.c
+++ b/kernel/exit.c
@@ -174,9 +174,6 @@ static void __exit_signal(struct task_struct *tsk)
 			sig->curr_target = next_thread(tsk);
 	}
 
-	add_device_randomness((const void*) &tsk->se.sum_exec_runtime,
-			      sizeof(unsigned long long));
-
 	/*
 	 * Accumulate here the counters for all threads as they die. We could
 	 * skip the group leader because it is the last user of signal_struct,
@@ -278,6 +275,9 @@ void release_task(struct task_struct *p)
 	write_unlock_irq(&tasklist_lock);
 	proc_flush_pid(thread_pid);
 	put_pid(thread_pid);
+	add_device_randomness(&p->se.sum_exec_runtime,
+			      sizeof(p->se.sum_exec_runtime));
+	free_pids(post.pids);
 	release_thread(p);
 	put_task_struct_rcu_user(p);
 
diff --git a/scripts/selinux/genheaders/genheaders b/scripts/selinux/genheaders/genheaders
deleted file mode 100755
index 3fc32a664a7930b12a38d02449aec78d49690dfe..0000000000000000000000000000000000000000
GIT binary patch
literal 0
HcmV?d00001

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-- 
2.43.0



  reply	other threads:[~2025-02-05 19:33 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2025-02-05 19:32 [PATCH v4 0/5] reduce tasklist_lock hold time on exit and do some pid cleanup Mateusz Guzik
2025-02-05 19:32 ` Mateusz Guzik [this message]
2025-02-05 19:55   ` [PATCH v4 1/5] exit: perform add_device_randomness() without tasklist_lock Oleg Nesterov
2025-02-05 20:00     ` Mateusz Guzik
2025-02-05 19:32 ` [PATCH v4 2/5] exit: hoist get_pid() in release_task() outside of tasklist_lock Mateusz Guzik
2025-02-05 19:32 ` [PATCH v4 3/5] pid: sprinkle tasklist_lock asserts Mateusz Guzik
2025-02-05 20:26   ` Liam R. Howlett
2025-02-05 20:34     ` Mateusz Guzik
2025-02-05 20:42       ` Liam R. Howlett
2025-02-05 20:58         ` Mateusz Guzik
2025-02-05 19:32 ` [PATCH v4 4/5] pid: perform free_pid() calls outside of tasklist_lock Mateusz Guzik
2025-02-05 19:32 ` [PATCH v4 5/5] pid: drop irq disablement around pidmap_lock Mateusz Guzik

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