From: Eric Dumazet <eric.dumazet@gmail.com>
To: Al Viro <viro@ZenIV.linux.org.uk>
Cc: Mimi Zohar <zohar@linux.vnet.ibm.com>,
Oleg Nesterov <oleg@redhat.com>,
Linus Torvalds <torvalds@linux-foundation.org>,
". James Morris" <jmorris@namei.org>,
linux-security-module@vger.kernel.org,
linux-kernel <linux-kernel@vger.kernel.org>,
David Howells <dhowells@redhat.com>
Subject: [PATCH] task_work: add a scheduling point in task_work_run()
Date: Tue, 21 Aug 2012 15:05:14 +0200 [thread overview]
Message-ID: <1345554314.5158.490.camel@edumazet-glaptop> (raw)
In-Reply-To: <1341240603.2086.1.camel@falcor>
From: Eric Dumazet <edumazet@google.com>
It seems commit 4a9d4b02 (switch fput to task_work_add) reintroduced
the problem addressed in commit 944be0b2 (close_files(): add scheduling
point)
If a server process with a lot of files (say 2 million tcp sockets)
is killed, we can spend a lot of time in task_work_run() and trigger
a soft lockup.
Signed-off-by: Eric Dumazet <edumazet@google.com>
---
kernel/task_work.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/kernel/task_work.c b/kernel/task_work.c
index 91d4e17..d320d44 100644
--- a/kernel/task_work.c
+++ b/kernel/task_work.c
@@ -75,6 +75,7 @@ void task_work_run(void)
p = q->next;
q->func(q);
q = p;
+ cond_resched();
}
}
}
next prev parent reply other threads:[~2012-08-21 13:05 UTC|newest]
Thread overview: 54+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-06-22 12:44 deferring __fput() Mimi Zohar
2012-06-23 9:20 ` Al Viro
2012-06-23 19:45 ` Al Viro
2012-06-23 20:38 ` Oleg Nesterov
2012-06-23 21:01 ` Al Viro
2012-06-23 21:11 ` Al Viro
2012-06-24 4:16 ` Al Viro
2012-06-24 10:09 ` Al Viro
2012-06-24 16:54 ` Oleg Nesterov
2012-06-24 15:33 ` Oleg Nesterov
2012-06-25 6:03 ` Al Viro
2012-06-25 15:18 ` Oleg Nesterov
2012-06-27 18:37 ` [PATCH 0/4] Was: " Oleg Nesterov
2012-06-27 18:37 ` [PATCH 1/4] task_work: use the single-linked list to shrink sizeof(task_work) Oleg Nesterov
2012-06-27 18:37 ` [PATCH 2/4] task_work: don't rely on PF_EXITING Oleg Nesterov
2012-06-27 18:38 ` [PATCH 3/4] task_work: deal with task_work callbacks adding more work Oleg Nesterov
2012-06-27 18:38 ` [PATCH 4/4] task_work: kill task_work->data Oleg Nesterov
2012-06-27 19:05 ` Oleg Nesterov
2012-06-28 4:38 ` [PATCH 0/4] Was: deferring __fput() Al Viro
2012-06-28 16:22 ` Oleg Nesterov
2012-06-28 16:45 ` Oleg Nesterov
2012-06-30 6:24 ` Al Viro
2012-06-30 17:41 ` Oleg Nesterov
2012-06-29 5:30 ` Mimi Zohar
2012-06-29 8:33 ` Al Viro
2012-06-29 13:02 ` Mimi Zohar
2012-06-29 17:41 ` Al Viro
2012-06-29 21:38 ` Mimi Zohar
2012-06-29 23:56 ` Mimi Zohar
2012-06-30 5:02 ` Al Viro
2012-07-01 19:50 ` Mimi Zohar
2012-07-01 20:57 ` Al Viro
2012-07-02 1:46 ` Mimi Zohar
2012-07-02 3:43 ` Al Viro
2012-07-02 5:11 ` Al Viro
2012-07-02 11:49 ` Mimi Zohar
2012-07-02 12:02 ` Al Viro
2012-07-02 13:01 ` Mimi Zohar
2012-07-02 13:33 ` Al Viro
2012-07-02 14:50 ` Mimi Zohar
2012-08-21 13:05 ` Eric Dumazet [this message]
2012-08-21 20:37 ` [PATCH] task_work: add a scheduling point in task_work_run() Mimi Zohar
2012-08-21 21:32 ` Eric Dumazet
2012-08-22 3:13 ` Mimi Zohar
2012-08-22 5:27 ` Michael Wang
2012-08-22 5:38 ` Al Viro
2012-06-23 20:57 ` deferring __fput() Al Viro
2012-06-23 21:33 ` Al Viro
2012-06-24 15:20 ` Oleg Nesterov
2012-06-24 18:11 ` Oleg Nesterov
2012-06-25 12:03 ` Peter Zijlstra
2012-06-25 12:14 ` Al Viro
2012-06-25 13:19 ` Peter Zijlstra
2012-06-25 13:53 ` Al Viro
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