From: Christoph Hellwig <hch@infradead.org>
To: Petr Mladek <pmladek@suse.cz>
Cc: Peter Zijlstra <peterz@infradead.org>,
Trond Myklebust <trond.myklebust@primarydata.com>,
linux-kernel@vger.kernel.org, Michal Hocko <mhocko@suse.cz>,
Chris Mason <clm@fb.com>,
linux-mtd@lists.infradead.org, live-patching@vger.kernel.org,
Richard Weinberger <richard@nod.at>,
Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@suse.de>,
David Woodhouse <dwmw2@infradead.org>,
Steven Rostedt <rostedt@goodmis.org>,
Thomas Gleixner <tglx@linutronix.de>,
linux-nfs@vger.kernel.org,
"Paul E. McKenney" <paulmck@linux.vnet.ibm.com>,
Jiri Kosina <jkosina@suse.cz>, Oleg Nesterov <oleg@redhat.com>,
linux-api@vger.kernel.org, Tejun Heo <tj@kernel.org>,
Andrew Morton <akpm@linux-foundation.org>,
Linus Torvalds <torvalds@linux-foundation.org>,
Anna Schumaker <anna.schumaker@netapp.com>
Subject: Re: [RFC PATCH 00/18] kthreads/signal: Safer kthread API and signal handling
Date: Wed, 17 Jun 2015 04:34:50 -0700 [thread overview]
Message-ID: <20150617113450.GA28508@infradead.org> (raw)
In-Reply-To: <1433516477-5153-1-git-send-email-pmladek@suse.cz>
On Fri, Jun 05, 2015 at 05:00:59PM +0200, Petr Mladek wrote:
> Kthreads are implemented as an infinite loop. They include check points
> for termination, freezer, parking, and even signal handling.
>
> We need to touch all kthreads every time we want to add or
> modify the behavior of such checkpoints. It is not easy because
> there are several hundreds of kthreads and each of them is
> implemented in a slightly different way.
>
> This anarchy brings potentially broken or non-standard behavior.
> For example, few kthreads already handle signals a strange way.
>
>
> This patchset is a _proof-of-concept_ how to improve the situation.
Maybe it might be a better idea to audit the existing callers of
signals for kthreads and first check if we can get rid of them. Then
as a second step if any are left convert them to signalfd-style
operation where signals aren't checked synchronously but as something
the threads can consume on a as needed basis.
prev parent reply other threads:[~2015-06-17 11:34 UTC|newest]
Thread overview: 62+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-06-05 15:00 [RFC PATCH 00/18] kthreads/signal: Safer kthread API and signal handling Petr Mladek
2015-06-05 15:01 ` [RFC PATCH 01/18] kthread: Allow to call __kthread_create_on_node() with va_list args Petr Mladek
2015-06-05 15:01 ` [RFC PATCH 02/18] kthread: Add API for iterant kthreads Petr Mladek
2015-06-09 6:23 ` Tejun Heo
2015-06-15 12:46 ` Petr Mladek
2015-06-05 15:01 ` [RFC PATCH 03/18] kthread: Add kthread_stop_current() Petr Mladek
2015-06-05 15:01 ` [RFC PATCH 04/18] signal: Rename kernel_sigaction() to kthread_sigaction() and clean it up Petr Mladek
2015-06-05 15:01 ` [RFC PATCH 05/18] freezer/scheduler: Add freezable_cond_resched() Petr Mladek
2015-06-05 15:01 ` [RFC PATCH 06/18] signal/kthread: Initial implementation of kthread signal handling Petr Mladek
2015-06-06 21:58 ` Oleg Nesterov
2015-06-08 13:51 ` Petr Mladek
2015-06-08 21:13 ` Oleg Nesterov
2015-06-15 13:13 ` Petr Mladek
2015-06-15 19:14 ` Oleg Nesterov
2015-06-16 7:54 ` Petr Mladek
2015-06-09 7:10 ` Tejun Heo
2015-06-09 12:15 ` Jiri Kosina
2015-06-10 3:13 ` Tejun Heo
2015-06-05 15:01 ` [RFC PATCH 07/18] kthread: Make iterant kthreads freezable by default Petr Mladek
2015-06-09 7:20 ` Tejun Heo
2015-06-09 15:53 ` Petr Mladek
2015-06-10 4:31 ` Tejun Heo
2015-06-12 13:24 ` Petr Mladek
2015-06-13 23:22 ` Tejun Heo
2015-06-15 9:28 ` Petr Mladek
2015-06-05 15:01 ` [RFC PATCH 08/18] kthread: Allow to get struct kthread_iterant from task_struct Petr Mladek
2015-06-05 15:01 ` [RFC PATCH 09/18] kthread: Make it easier to correctly sleep in iterant kthreads Petr Mladek
2015-06-05 16:10 ` Peter Zijlstra
2015-06-08 10:01 ` Petr Mladek
2015-06-08 11:39 ` Peter Zijlstra
2015-06-09 15:25 ` Petr Mladek
2015-06-10 9:05 ` Peter Zijlstra
2015-06-09 7:32 ` Tejun Heo
2015-06-08 17:48 ` Steven Rostedt
2015-06-10 9:07 ` Peter Zijlstra
2015-06-10 14:07 ` Steven Rostedt
2015-06-11 4:28 ` Jiri Kosina
2015-06-05 15:01 ` [RFC PATCH 10/18] jffs2: Remove forward definition of jffs2_garbage_collect_thread() Petr Mladek
2015-06-05 15:01 ` [RFC PATCH 11/18] jffs2: Convert jffs2_gcd_mtd kthread into the iterant API Petr Mladek
2015-06-06 21:16 ` Oleg Nesterov
2015-06-06 21:32 ` Jiri Kosina
2015-06-06 22:30 ` Oleg Nesterov
2015-06-06 22:44 ` Jiri Kosina
2015-06-06 22:58 ` Oleg Nesterov
2015-06-05 15:01 ` [RFC PATCH 12/18] lockd: Convert the central lockd service to kthread_iterant API Petr Mladek
2015-06-05 15:01 ` [RFC PATCH 13/18] ring_buffer: Use iterant kthreads API in the ring buffer benchmark Petr Mladek
2015-06-05 15:01 ` [RFC PATCH 14/18] ring_buffer: Allow to cleanly freeze the ring buffer benchmark kthreads Petr Mladek
2015-06-05 15:01 ` [RFC PATCH 15/18] ring_buffer: Allow to exit the ring buffer benchmark immediately Petr Mladek
2015-06-08 17:44 ` Steven Rostedt
2015-06-15 15:23 ` Petr Mladek
2015-06-15 15:33 ` Steven Rostedt
2015-06-15 15:54 ` Petr Mladek
2015-06-05 15:01 ` [RFC PATCH 16/18] kthread: Support interruptible sleep with a timeout by iterant kthreads Petr Mladek
2015-06-05 15:01 ` [RFC PATCH 17/18] ring_buffer: Use the new API for a sleep with a timeout in the benchmark Petr Mladek
2015-06-05 15:01 ` [RFC PATCH 18/18] jffs2: Use the new API for a sleep with a timeout Petr Mladek
2015-06-05 16:22 ` [RFC PATCH 00/18] kthreads/signal: Safer kthread API and signal handling Peter Zijlstra
2015-06-09 6:14 ` Tejun Heo
2015-06-10 10:40 ` Peter Zijlstra
2015-06-11 22:02 ` Tejun Heo
2015-06-09 6:10 ` Tejun Heo
2015-06-09 7:58 ` Tejun Heo
2015-06-17 11:34 ` Christoph Hellwig [this message]
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