From: Byungchul Park <byungchul.park@lge.com>
To: Theodore Ts'o <tytso@mit.edu>
Cc: damien.lemoal@opensource.wdc.com, linux-ide@vger.kernel.org,
adilger.kernel@dilger.ca, linux-ext4@vger.kernel.org,
torvalds@linux-foundation.org, mingo@redhat.com,
linux-kernel@vger.kernel.org, peterz@infradead.org,
will@kernel.org, tglx@linutronix.de, rostedt@goodmis.org,
joel@joelfernandes.org, sashal@kernel.org,
daniel.vetter@ffwll.ch, chris@chris-wilson.co.uk,
duyuyang@gmail.com, johannes.berg@intel.com, tj@kernel.org,
willy@infradead.org, david@fromorbit.com, amir73il@gmail.com,
bfields@fieldses.org, gregkh@linuxfoundation.org,
kernel-team@lge.com, linux-mm@kvack.org,
akpm@linux-foundation.org, mhocko@kernel.org, minchan@kernel.org,
hannes@cmpxchg.org, vdavydov.dev@gmail.com, sj@kernel.org,
jglisse@redhat.com, dennis@kernel.org, cl@linux.com,
penberg@kernel.org, rientjes@google.com, vbabka@suse.cz,
ngupta@vflare.org, linux-block@vger.kernel.org,
paolo.valente@linaro.org, josef@toxicpanda.com,
linux-fsdevel@vger.kernel.org, viro@zeniv.linux.org.uk,
jack@suse.cz, jack@suse.com, jlayton@kernel.org,
dan.j.williams@intel.com, hch@infradead.org, djwong@kernel.org,
dri-devel@lists.freedesktop.org, airlied@linux.ie,
rodrigosiqueiramelo@gmail.com, melissa.srw@gmail.com,
hamohammed.sa@gmail.com
Subject: Re: Report 2 in ext4 and journal based on v5.17-rc1
Date: Fri, 4 Mar 2022 12:20:02 +0900 [thread overview]
Message-ID: <20220304032002.GD6112@X58A-UD3R> (raw)
In-Reply-To: <YiDSabde88HJ/aTt@mit.edu>
On Thu, Mar 03, 2022 at 09:36:25AM -0500, Theodore Ts'o wrote:
> On Thu, Mar 03, 2022 at 02:23:33PM +0900, Byungchul Park wrote:
> > I totally agree with you. *They aren't really locks but it's just waits
> > and wakeups.* That's exactly why I decided to develop Dept. Dept is not
> > interested in locks unlike Lockdep, but fouces on waits and wakeup
> > sources itself. I think you get Dept wrong a lot. Please ask me more if
> > you have things you doubt about Dept.
>
> So the question is this --- do you now understand why, even though
> there is a circular dependency, nothing gets stalled in the
> interactions between the two wait channels?
I found a point that the two wait channels don't lead a deadlock in
some cases thanks to Jan Kara. I will fix it so that Dept won't
complain it.
Thanks,
Byungchul
>
> - Ted
WARNING: multiple messages have this Message-ID (diff)
From: Byungchul Park <byungchul.park@lge.com>
To: Theodore Ts'o <tytso@mit.edu>
Cc: hamohammed.sa@gmail.com, jack@suse.cz, peterz@infradead.org,
daniel.vetter@ffwll.ch, amir73il@gmail.com, david@fromorbit.com,
dri-devel@lists.freedesktop.org, chris@chris-wilson.co.uk,
bfields@fieldses.org, linux-ide@vger.kernel.org,
adilger.kernel@dilger.ca, joel@joelfernandes.org, cl@linux.com,
will@kernel.org, duyuyang@gmail.com, sashal@kernel.org,
paolo.valente@linaro.org, damien.lemoal@opensource.wdc.com,
willy@infradead.org, hch@infradead.org, airlied@linux.ie,
mingo@redhat.com, djwong@kernel.org, vdavydov.dev@gmail.com,
rientjes@google.com, dennis@kernel.org,
linux-ext4@vger.kernel.org, linux-mm@kvack.org,
ngupta@vflare.org, johannes.berg@intel.com, jack@suse.com,
dan.j.williams@intel.com, josef@toxicpanda.com,
rostedt@goodmis.org, linux-block@vger.kernel.org,
linux-fsdevel@vger.kernel.org, jglisse@redhat.com,
viro@zeniv.linux.org.uk, tglx@linutronix.de, mhocko@kernel.org,
vbabka@suse.cz, melissa.srw@gmail.com, sj@kernel.org,
rodrigosiqueiramelo@gmail.com, kernel-team@lge.com,
gregkh@linuxfoundation.org, jlayton@kernel.org,
linux-kernel@vger.kernel.org, penberg@kernel.org,
minchan@kernel.org, hannes@cmpxchg.org, tj@kernel.org,
akpm@linux-foundation.org, torvalds@linux-foundation.org
Subject: Re: Report 2 in ext4 and journal based on v5.17-rc1
Date: Fri, 4 Mar 2022 12:20:02 +0900 [thread overview]
Message-ID: <20220304032002.GD6112@X58A-UD3R> (raw)
In-Reply-To: <YiDSabde88HJ/aTt@mit.edu>
On Thu, Mar 03, 2022 at 09:36:25AM -0500, Theodore Ts'o wrote:
> On Thu, Mar 03, 2022 at 02:23:33PM +0900, Byungchul Park wrote:
> > I totally agree with you. *They aren't really locks but it's just waits
> > and wakeups.* That's exactly why I decided to develop Dept. Dept is not
> > interested in locks unlike Lockdep, but fouces on waits and wakeup
> > sources itself. I think you get Dept wrong a lot. Please ask me more if
> > you have things you doubt about Dept.
>
> So the question is this --- do you now understand why, even though
> there is a circular dependency, nothing gets stalled in the
> interactions between the two wait channels?
I found a point that the two wait channels don't lead a deadlock in
some cases thanks to Jan Kara. I will fix it so that Dept won't
complain it.
Thanks,
Byungchul
>
> - Ted
next prev parent reply other threads:[~2022-03-04 3:20 UTC|newest]
Thread overview: 134+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-02-17 10:57 [PATCH 00/16] DEPT(Dependency Tracker) Byungchul Park
2022-02-17 10:57 ` Byungchul Park
2022-02-17 10:57 ` [PATCH 01/16] llist: Move llist_{head,node} definition to types.h Byungchul Park
2022-02-17 10:57 ` Byungchul Park
2022-02-17 10:57 ` [PATCH 02/16] dept: Implement Dept(Dependency Tracker) Byungchul Park
2022-02-17 10:57 ` Byungchul Park
2022-02-17 15:54 ` Steven Rostedt
2022-02-17 15:54 ` Steven Rostedt
2022-02-17 17:36 ` Steven Rostedt
2022-02-17 17:36 ` Steven Rostedt
2022-02-18 6:09 ` Byungchul Park
2022-02-18 6:09 ` Byungchul Park
2022-02-17 19:46 ` kernel test robot
2022-02-17 19:46 ` kernel test robot
2022-02-17 19:46 ` kernel test robot
2022-02-17 19:46 ` kernel test robot
2022-02-17 10:57 ` [PATCH 03/16] dept: Embed Dept data in Lockdep Byungchul Park
2022-02-17 10:57 ` Byungchul Park
2022-02-17 10:57 ` [PATCH 04/16] dept: Apply Dept to spinlock Byungchul Park
2022-02-17 10:57 ` Byungchul Park
2022-02-17 10:57 ` [PATCH 05/16] dept: Apply Dept to mutex families Byungchul Park
2022-02-17 10:57 ` Byungchul Park
2022-02-17 10:57 ` [PATCH 06/16] dept: Apply Dept to rwlock Byungchul Park
2022-02-17 10:57 ` Byungchul Park
2022-02-17 10:57 ` [PATCH 07/16] dept: Apply Dept to wait_for_completion()/complete() Byungchul Park
2022-02-17 10:57 ` Byungchul Park
2022-02-17 19:46 ` kernel test robot
2022-02-17 19:46 ` kernel test robot
2022-02-17 10:57 ` [PATCH 08/16] dept: Apply Dept to seqlock Byungchul Park
2022-02-17 10:57 ` Byungchul Park
2022-02-17 10:57 ` [PATCH 09/16] dept: Apply Dept to rwsem Byungchul Park
2022-02-17 10:57 ` Byungchul Park
2022-02-17 10:57 ` [PATCH 10/16] dept: Add proc knobs to show stats and dependency graph Byungchul Park
2022-02-17 10:57 ` Byungchul Park
2022-02-17 15:55 ` Steven Rostedt
2022-02-17 15:55 ` Steven Rostedt
2022-02-17 10:57 ` [PATCH 11/16] dept: Introduce split map concept and new APIs for them Byungchul Park
2022-02-17 10:57 ` Byungchul Park
2022-02-17 10:57 ` [PATCH 12/16] dept: Apply Dept to wait/event of PG_{locked,writeback} Byungchul Park
2022-02-17 10:57 ` [PATCH 12/16] dept: Apply Dept to wait/event of PG_{locked, writeback} Byungchul Park
2022-02-17 10:57 ` [PATCH 13/16] dept: Apply SDT to swait Byungchul Park
2022-02-17 10:57 ` Byungchul Park
2022-02-17 10:57 ` [PATCH 14/16] dept: Apply SDT to wait(waitqueue) Byungchul Park
2022-02-17 10:57 ` Byungchul Park
2022-02-17 10:57 ` [PATCH 15/16] locking/lockdep, cpu/hotplus: Use a weaker annotation in AP thread Byungchul Park
2022-02-17 10:57 ` Byungchul Park
2022-02-17 10:57 ` [PATCH 16/16] dept: Distinguish each syscall context from another Byungchul Park
2022-02-17 10:57 ` Byungchul Park
2022-02-17 11:10 ` Report 1 in ext4 and journal based on v5.17-rc1 Byungchul Park
2022-02-17 11:10 ` Byungchul Park
2022-02-17 11:10 ` Report 2 " Byungchul Park
2022-02-17 11:10 ` Byungchul Park
2022-02-21 19:02 ` Jan Kara
2022-02-21 19:02 ` Jan Kara
2022-02-23 0:35 ` Byungchul Park
2022-02-23 0:35 ` Byungchul Park
2022-02-23 14:48 ` Jan Kara
2022-02-23 14:48 ` Jan Kara
2022-02-24 1:11 ` Byungchul Park
2022-02-24 1:11 ` Byungchul Park
2022-02-24 10:22 ` Jan Kara
2022-02-24 10:22 ` Jan Kara
2022-02-28 9:28 ` Byungchul Park
2022-02-28 9:28 ` Byungchul Park
2022-02-28 10:14 ` Jan Kara
2022-02-28 10:14 ` Jan Kara
2022-02-28 21:25 ` Theodore Ts'o
2022-02-28 21:25 ` Theodore Ts'o
2022-03-03 1:36 ` Byungchul Park
2022-03-03 1:36 ` Byungchul Park
2022-03-03 1:00 ` Byungchul Park
2022-03-03 1:00 ` Byungchul Park
2022-03-03 2:32 ` Theodore Ts'o
2022-03-03 2:32 ` Theodore Ts'o
2022-03-03 5:23 ` Byungchul Park
2022-03-03 5:23 ` Byungchul Park
2022-03-03 14:36 ` Theodore Ts'o
2022-03-03 14:36 ` Theodore Ts'o
2022-03-04 0:42 ` Byungchul Park
2022-03-04 0:42 ` Byungchul Park
2022-03-05 3:26 ` Theodore Ts'o
2022-03-05 3:26 ` Theodore Ts'o
2022-03-05 14:15 ` Byungchul Park
2022-03-05 14:15 ` Byungchul Park
2022-03-05 15:05 ` Joel Fernandes
2022-03-05 15:05 ` Joel Fernandes
2022-03-07 2:43 ` Byungchul Park
2022-03-07 2:43 ` Byungchul Park
2022-03-04 3:20 ` Byungchul Park [this message]
2022-03-04 3:20 ` Byungchul Park
2022-03-05 3:40 ` Theodore Ts'o
2022-03-05 3:40 ` Theodore Ts'o
2022-03-05 14:55 ` Byungchul Park
2022-03-05 14:55 ` Byungchul Park
2022-03-05 15:12 ` Reimar Döffinger
2022-03-05 15:12 ` Reimar Döffinger
2022-03-06 3:30 ` Theodore Ts'o
2022-03-06 3:30 ` Theodore Ts'o
2022-03-06 10:51 ` Byungchul Park
2022-03-06 10:51 ` Byungchul Park
2022-03-06 14:19 ` Theodore Ts'o
2022-03-06 14:19 ` Theodore Ts'o
2022-03-10 1:45 ` Byungchul Park
2022-03-10 1:45 ` Byungchul Park
2022-03-03 9:54 ` Jan Kara
2022-03-03 9:54 ` Jan Kara
2022-03-04 1:56 ` Byungchul Park
2022-03-04 1:56 ` Byungchul Park
2022-02-17 13:27 ` Report 1 " Matthew Wilcox
2022-02-17 13:27 ` Matthew Wilcox
2022-02-18 0:41 ` Byungchul Park
2022-02-18 0:41 ` Byungchul Park
2022-02-22 8:27 ` Jan Kara
2022-02-22 8:27 ` Jan Kara
2022-02-23 1:40 ` Byungchul Park
2022-02-23 1:40 ` Byungchul Park
2022-02-23 3:30 ` Byungchul Park
2022-02-23 3:30 ` Byungchul Park
2022-02-17 15:51 ` [PATCH 00/16] DEPT(Dependency Tracker) Theodore Ts'o
2022-02-17 15:51 ` Theodore Ts'o
2022-02-17 17:00 ` Steven Rostedt
2022-02-17 17:00 ` Steven Rostedt
2022-02-17 17:06 ` Matthew Wilcox
2022-02-17 17:06 ` Matthew Wilcox
2022-02-19 10:05 ` Byungchul Park
2022-02-19 10:05 ` Byungchul Park
2022-02-18 4:19 ` Theodore Ts'o
2022-02-18 4:19 ` Theodore Ts'o
2022-02-19 10:34 ` Byungchul Park
2022-02-19 10:34 ` Byungchul Park
2022-02-19 10:18 ` Byungchul Park
2022-02-19 10:18 ` Byungchul Park
2022-02-19 9:54 ` Byungchul Park
2022-02-19 9:54 ` Byungchul Park
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