From: Peter Zijlstra <peterz@infradead.org>
To: John Ogness <john.ogness@linutronix.de>
Cc: Petr Mladek <pmladek@suse.com>,
Sergey Senozhatsky <senozhatsky@chromium.org>,
Steven Rostedt <rostedt@goodmis.org>,
Thomas Gleixner <tglx@linutronix.de>,
linux-kernel@vger.kernel.org, Ingo Molnar <mingo@redhat.com>,
Will Deacon <will@kernel.org>, Waiman Long <longman@redhat.com>,
Boqun Feng <boqun.feng@gmail.com>
Subject: Re: [PATCH printk v4 27/27] lockdep: Mark emergency sections in lockdep splats
Date: Tue, 16 Apr 2024 13:17:49 +0200 [thread overview]
Message-ID: <20240416111749.GM40213@noisy.programming.kicks-ass.net> (raw)
In-Reply-To: <20240402221129.2613843-28-john.ogness@linutronix.de>
On Wed, Apr 03, 2024 at 12:17:29AM +0206, John Ogness wrote:
> Mark emergency sections wherever multiple lines of
> lock debugging output are generated. In an emergency
> section the CPU will not perform console output for the
> printk() calls. Instead, a flushing of the console
> output is triggered when exiting the emergency section.
> This allows the full message block to be stored as
> quickly as possible in the ringbuffer.
I am confused, when in emergency I want the thing to dump everything to
the atomic thing asap.
Storing it all up runs the risk of never getting to the 'complete' point
because we're dead.
next prev parent reply other threads:[~2024-04-16 11:18 UTC|newest]
Thread overview: 66+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-04-02 22:11 [PATCH printk v4 00/27] wire up write_atomic() printing John Ogness
2024-04-02 22:11 ` [PATCH printk v4 01/27] printk: Add notation to console_srcu locking John Ogness
2024-04-02 22:11 ` [PATCH printk v4 02/27] printk: Properly deal with nbcon consoles on seq init John Ogness
2024-04-05 15:37 ` Petr Mladek
2024-04-02 22:11 ` [PATCH printk v4 03/27] printk: nbcon: Remove return value for write_atomic() John Ogness
2024-04-08 13:17 ` Petr Mladek
2024-04-02 22:11 ` [PATCH printk v4 04/27] printk: Check printk_deferred_enter()/_exit() usage John Ogness
2024-04-02 22:11 ` [PATCH printk v4 05/27] printk: nbcon: Add detailed doc for write_atomic() John Ogness
2024-04-08 15:20 ` Petr Mladek
2024-04-02 22:11 ` [PATCH printk v4 06/27] printk: nbcon: Add callbacks to synchronize with driver John Ogness
2024-04-09 9:20 ` Petr Mladek
2024-04-16 15:01 ` John Ogness
2024-04-17 13:03 ` Petr Mladek
2024-04-17 14:54 ` John Ogness
2024-04-18 10:33 ` Petr Mladek
2024-04-18 12:10 ` John Ogness
2024-04-18 15:03 ` Petr Mladek
2024-04-02 22:11 ` [PATCH printk v4 07/27] printk: nbcon: Use driver synchronization while registering John Ogness
2024-04-09 9:46 ` Petr Mladek
2024-04-02 22:11 ` [PATCH printk v4 08/27] serial: core: Provide low-level functions to lock port John Ogness
2024-04-09 12:00 ` Petr Mladek
2024-04-09 13:23 ` Greg Kroah-Hartman
2024-04-02 22:11 ` [PATCH printk v4 09/27] printk: nbcon: Implement processing in port->lock wrapper John Ogness
2024-04-03 11:35 ` John Ogness
2024-04-10 12:35 ` Petr Mladek
2024-04-02 22:11 ` [PATCH printk v4 10/27] printk: nbcon: Do not rely on proxy headers John Ogness
2024-04-03 10:33 ` Andy Shevchenko
2024-04-10 13:06 ` Petr Mladek
2024-04-02 22:11 ` [PATCH printk v4 11/27] printk: nbcon: Fix kerneldoc for enums John Ogness
2024-04-02 22:11 ` [PATCH printk v4 12/27] printk: Make console_is_usable() available to nbcon John Ogness
2024-04-02 22:11 ` [PATCH printk v4 13/27] printk: Let console_is_usable() handle nbcon John Ogness
2024-04-02 22:11 ` [PATCH printk v4 14/27] printk: Add @flags argument for console_is_usable() John Ogness
2024-04-02 22:11 ` [PATCH printk v4 15/27] printk: nbcon: Provide function to flush using write_atomic() John Ogness
2024-04-10 14:56 ` Petr Mladek
2024-04-02 22:11 ` [PATCH printk v4 16/27] printk: Track registered boot consoles John Ogness
2024-04-02 22:11 ` [PATCH printk v4 17/27] printk: nbcon: Use nbcon consoles in console_flush_all() John Ogness
2024-04-11 14:14 ` Petr Mladek
2024-04-11 15:32 ` Petr Mladek
2024-04-17 23:05 ` John Ogness
2024-04-18 12:47 ` Petr Mladek
2024-04-18 21:45 ` John Ogness
2024-04-19 9:55 ` Petr Mladek
2024-04-12 9:07 ` Petr Mladek
2024-04-17 21:59 ` John Ogness
2024-04-02 22:11 ` [PATCH printk v4 18/27] printk: nbcon: Assign priority based on CPU state John Ogness
2024-04-02 22:11 ` [PATCH printk v4 19/27] printk: nbcon: Add unsafe flushing on panic John Ogness
2024-04-11 14:18 ` Petr Mladek
2024-04-02 22:11 ` [PATCH printk v4 20/27] printk: Avoid console_lock dance if no legacy or boot consoles John Ogness
2024-04-03 10:01 ` John Ogness
2024-04-12 14:21 ` Petr Mladek
2024-04-02 22:11 ` [PATCH printk v4 21/27] printk: Track nbcon consoles John Ogness
2024-04-12 14:22 ` Petr Mladek
2024-04-02 22:11 ` [PATCH printk v4 22/27] printk: Coordinate direct printing in panic John Ogness
2024-04-12 14:39 ` Petr Mladek
2024-04-02 22:11 ` [PATCH printk v4 23/27] printk: nbcon: Implement emergency sections John Ogness
2024-04-12 15:27 ` Petr Mladek
2024-04-02 22:11 ` [PATCH printk v4 24/27] panic: Mark emergency section in warn John Ogness
2024-04-15 13:16 ` Petr Mladek
2024-04-02 22:11 ` [PATCH printk v4 25/27] panic: Mark emergency section in oops John Ogness
2024-04-15 13:22 ` Petr Mladek
2024-04-02 22:11 ` [PATCH printk v4 26/27] rcu: Mark emergency section in rcu stalls John Ogness
2024-04-15 13:32 ` Petr Mladek
2024-04-02 22:11 ` [PATCH printk v4 27/27] lockdep: Mark emergency sections in lockdep splats John Ogness
2024-04-16 9:51 ` Petr Mladek
2024-04-16 11:17 ` Peter Zijlstra [this message]
2024-04-16 12:53 ` John Ogness
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