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 2/5] exit: hoist get_pid() in release_task() outside of tasklist_lock
Date: Wed, 5 Feb 2025 20:32:18 +0100 [thread overview]
Message-ID: <20250205193221.402150-3-mjguzik@gmail.com> (raw)
In-Reply-To: <20250205193221.402150-1-mjguzik@gmail.com>
reduces hold time as get_pid() contains an atomic
Reviewed-by: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Mateusz Guzik <mjguzik@gmail.com>
---
kernel/exit.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/kernel/exit.c b/kernel/exit.c
index c79b41509cd3..b5c0cbc6bdfb 100644
--- a/kernel/exit.c
+++ b/kernel/exit.c
@@ -248,9 +248,10 @@ void release_task(struct task_struct *p)
cgroup_release(p);
+ thread_pid = get_pid(p->thread_pid);
+
write_lock_irq(&tasklist_lock);
ptrace_release_task(p);
- thread_pid = get_pid(p->thread_pid);
__exit_signal(p);
/*
--
2.43.0
next prev parent 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 ` [PATCH v4 1/5] exit: perform add_device_randomness() without tasklist_lock Mateusz Guzik
2025-02-05 19:55 ` Oleg Nesterov
2025-02-05 20:00 ` Mateusz Guzik
2025-02-05 19:32 ` Mateusz Guzik [this message]
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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