From: Oleg Nesterov <oleg@redhat.com>
To: "Sapkal, Swapnil" <swapnil.sapkal@amd.com>
Cc: Manfred Spraul <manfred@colorfullife.com>,
Linus Torvalds <torvalds@linux-foundation.org>,
Christian Brauner <brauner@kernel.org>,
David Howells <dhowells@redhat.com>,
WangYuli <wangyuli@uniontech.com>,
linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org,
K Prateek Nayak <kprateek.nayak@amd.com>,
"Shenoy, Gautham Ranjal" <gautham.shenoy@amd.com>,
Neeraj.Upadhyay@amd.com
Subject: Re: [PATCH] pipe_read: don't wake up the writer if the pipe is still full
Date: Tue, 25 Feb 2025 12:57:37 +0100 [thread overview]
Message-ID: <20250225115736.GA18523@redhat.com> (raw)
In-Reply-To: <20250224142329.GA19016@redhat.com>
On 02/24, Oleg Nesterov wrote:
>
> Just in case, did you use
>
> https://git.kernel.org/pub/scm/utils/rt-tests/rt-tests.git/tree/src/hackbench/hackbench.c
>
> ?
Or did you use another version?
Exactly what parameters did you use?
If possible, please reproduce the hang again. How many threads/processes
sleeping in pipe_read() or pipe_write() do you see? (you can look at
/proc/$pid/stack).
Please pick one sleeping writer, and do
$ strace -p pidof_that_write
this should wake this writer up. If a missed wakeup is the only problem,
hackbench should continue.
The more info you can provide the better ;)
Oleg.
next prev parent reply other threads:[~2025-02-25 11:58 UTC|newest]
Thread overview: 109+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-01-02 14:07 [PATCH] pipe_read: don't wake up the writer if the pipe is still full Oleg Nesterov
2025-01-02 16:20 ` WangYuli
2025-01-02 16:46 ` Oleg Nesterov
2025-01-04 8:42 ` Christian Brauner
2025-01-31 9:49 ` K Prateek Nayak
2025-01-31 13:23 ` Oleg Nesterov
2025-01-31 20:06 ` Linus Torvalds
2025-02-02 17:01 ` Oleg Nesterov
2025-02-02 18:39 ` Linus Torvalds
2025-02-02 19:32 ` Oleg Nesterov
2025-02-04 11:17 ` Christian Brauner
2025-02-03 9:05 ` K Prateek Nayak
2025-02-04 13:49 ` Oleg Nesterov
2025-02-24 9:26 ` Sapkal, Swapnil
2025-02-24 14:24 ` Oleg Nesterov
2025-02-24 18:36 ` Linus Torvalds
2025-02-25 14:26 ` Oleg Nesterov
2025-02-25 11:57 ` Oleg Nesterov [this message]
2025-02-26 5:55 ` Sapkal, Swapnil
2025-02-26 11:38 ` Oleg Nesterov
2025-02-26 17:56 ` Sapkal, Swapnil
2025-02-26 18:12 ` Oleg Nesterov
2025-03-03 13:00 ` Alexey Gladkov
2025-03-03 15:46 ` K Prateek Nayak
2025-03-03 17:18 ` Alexey Gladkov
2025-02-26 13:18 ` Mateusz Guzik
2025-02-26 13:21 ` Mateusz Guzik
2025-02-26 17:16 ` Oleg Nesterov
2025-02-27 16:18 ` Sapkal, Swapnil
2025-02-27 16:34 ` Mateusz Guzik
2025-02-27 21:12 ` Oleg Nesterov
2025-02-28 5:58 ` Sapkal, Swapnil
2025-02-28 14:30 ` Oleg Nesterov
2025-02-28 16:33 ` Oleg Nesterov
2025-03-03 9:46 ` Sapkal, Swapnil
2025-03-03 14:37 ` Mateusz Guzik
2025-03-03 14:51 ` Mateusz Guzik
2025-03-03 15:31 ` K Prateek Nayak
2025-03-03 17:54 ` Mateusz Guzik
2025-03-03 18:11 ` Linus Torvalds
2025-03-03 18:33 ` Mateusz Guzik
2025-03-03 18:55 ` Linus Torvalds
2025-03-03 19:06 ` Mateusz Guzik
2025-03-03 20:27 ` Oleg Nesterov
2025-03-03 20:46 ` Linus Torvalds
2025-03-04 5:31 ` K Prateek Nayak
2025-03-04 6:32 ` Linus Torvalds
2025-03-04 12:54 ` Oleg Nesterov
2025-03-04 13:25 ` Oleg Nesterov
2025-03-04 18:28 ` Linus Torvalds
2025-03-04 22:11 ` Oleg Nesterov
2025-03-05 4:40 ` K Prateek Nayak
2025-03-05 4:52 ` Linus Torvalds
2025-03-04 13:51 ` [PATCH] fs/pipe: Read pipe->{head,tail} atomically outside pipe->mutex K Prateek Nayak
2025-03-04 18:36 ` Alexey Gladkov
2025-03-04 19:03 ` Linus Torvalds
2025-03-05 15:31 ` [PATCH] pipe_read: don't wake up the writer if the pipe is still full Rasmus Villemoes
2025-03-05 16:50 ` Linus Torvalds
2025-03-06 9:48 ` Rasmus Villemoes
2025-03-06 14:42 ` Rasmus Villemoes
2025-03-05 16:40 ` Linus Torvalds
2025-03-06 8:35 ` Rasmus Villemoes
2025-03-06 17:59 ` Linus Torvalds
2025-03-06 9:28 ` Rasmus Villemoes
2025-03-06 11:39 ` [RFC PATCH 0/3] pipe: Convert pipe->{head,tail} to unsigned short K Prateek Nayak
2025-03-06 11:39 ` [RFC PATCH 1/3] fs/pipe: Limit the slots in pipe_resize_ring() K Prateek Nayak
2025-03-06 12:28 ` Oleg Nesterov
2025-03-06 15:26 ` K Prateek Nayak
2025-03-06 11:39 ` [RFC PATCH 2/3] fs/splice: Atomically read pipe->{head,tail} in opipe_prep() K Prateek Nayak
2025-03-06 11:39 ` [RFC PATCH 3/3] treewide: pipe: Convert all references to pipe->{head,tail,max_usage,ring_size} to unsigned short K Prateek Nayak
2025-03-06 12:32 ` Oleg Nesterov
2025-03-06 12:41 ` Oleg Nesterov
2025-03-06 15:33 ` K Prateek Nayak
2025-03-06 18:04 ` Linus Torvalds
2025-03-06 14:27 ` Rasmus Villemoes
2025-03-03 18:32 ` [PATCH] pipe_read: don't wake up the writer if the pipe is still full K Prateek Nayak
2025-03-04 5:22 ` K Prateek Nayak
2025-03-03 16:49 ` Oleg Nesterov
2025-03-04 5:06 ` Hillf Danton
2025-03-04 5:35 ` K Prateek Nayak
2025-03-04 10:29 ` Hillf Danton
2025-03-04 12:34 ` Oleg Nesterov
2025-03-04 23:35 ` Hillf Danton
2025-03-04 23:49 ` Oleg Nesterov
2025-03-05 4:56 ` Hillf Danton
2025-03-05 11:44 ` Oleg Nesterov
2025-03-05 22:46 ` Hillf Danton
2025-03-06 9:30 ` Oleg Nesterov
2025-03-07 6:08 ` Hillf Danton
2025-03-07 6:24 ` K Prateek Nayak
2025-03-07 10:46 ` Hillf Danton
2025-03-07 11:29 ` Oleg Nesterov
2025-03-07 12:34 ` Oleg Nesterov
2025-03-07 23:56 ` Hillf Danton
2025-03-09 14:01 ` K Prateek Nayak
2025-03-09 17:02 ` Oleg Nesterov
2025-03-10 10:49 ` Hillf Danton
2025-03-10 11:09 ` Oleg Nesterov
2025-03-10 11:37 ` Hillf Danton
2025-03-10 12:43 ` Oleg Nesterov
2025-03-10 23:33 ` Hillf Danton
2025-03-11 0:26 ` Linus Torvalds
2025-03-11 6:54 ` Oleg Nesterov
[not found] ` <20250311112922.3342-1-hdanton@sina.com>
2025-03-11 11:53 ` Oleg Nesterov
2025-03-07 11:26 ` Oleg Nesterov
2025-02-27 12:50 ` Oleg Nesterov
2025-02-27 13:52 ` Oleg Nesterov
2025-02-27 15:59 ` Mateusz Guzik
2025-02-27 16:28 ` Oleg Nesterov
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