From: Petr Mladek <pmladek@suse.com>
To: John Ogness <john.ogness@linutronix.de>
Cc: Sergey Senozhatsky <sergey.senozhatsky.work@gmail.com>,
Sergey Senozhatsky <sergey.senozhatsky@gmail.com>,
Steven Rostedt <rostedt@goodmis.org>,
Thomas Gleixner <tglx@linutronix.de>,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH printk-rework 08/12] printk: introduce a kmsg_dump iterator
Date: Mon, 1 Feb 2021 14:17:17 +0100 [thread overview]
Message-ID: <YBf/XUmgflhMHtBx@alley> (raw)
In-Reply-To: <20210126211551.26536-9-john.ogness@linutronix.de>
On Tue 2021-01-26 22:21:47, John Ogness wrote:
> Rather than store the iterator information into the registered
> kmsg_dump structure, create a separate iterator structure. The
> kmsg_dump_iter structure can reside on the stack of the caller,
> thus allowing lockless use of the kmsg_dump functions.
>
> This is in preparation for removal of @logbuf_lock.
> diff --git a/include/linux/kmsg_dump.h b/include/linux/kmsg_dump.h
> index 76cc4122d08e..ecc98f549d93 100644
> --- a/include/linux/kmsg_dump.h
> +++ b/include/linux/kmsg_dump.h
> @@ -29,6 +29,18 @@ enum kmsg_dump_reason {
> KMSG_DUMP_MAX
> };
>
> +/**
> + * struct kmsg_dumper_iter - iterator for kernel crash message dumper
> + * @active: Flag that specifies if this is currently dumping
> + * @cur_seq: The record to dump (private)
> + * @next_seq: The first record of the next block (private)
Just to be sure. This description should get update if you agree with
the alternative one in the 1st patch.
> + */
> +struct kmsg_dumper_iter {
> + bool active;
> + u64 cur_seq;
> + u64 next_seq;
> +};
> +
Otherwise, I like this change.
Best Regards,
Petr
next prev parent reply other threads:[~2021-02-01 13:20 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-01-26 21:15 [PATCH printk-rework 00/12] printk: remove logbuf_lock John Ogness
2021-01-26 21:15 ` [PATCH printk-rework 01/12] printk: kmsg_dump: remove unused fields John Ogness
2021-01-26 21:15 ` [PATCH printk-rework 02/12] printk: refactor kmsg_dump_get_buffer() John Ogness
2021-01-26 21:15 ` [PATCH printk-rework 03/12] printk: consolidate kmsg_dump_get_buffer/syslog_print_all code John Ogness
[not found] ` <YBQgTQYTA5p6Wgj6@alley>
2021-02-01 9:49 ` John Ogness
2021-02-02 12:31 ` Petr Mladek
2021-01-26 21:15 ` [PATCH printk-rework 04/12] printk: define CONSOLE_LOG_MAX in printk.h John Ogness
[not found] ` <YBQtbKrdwUAZQB9v@alley>
2021-02-01 8:24 ` LINE_MAX: was: " John Ogness
2021-02-02 11:22 ` Petr Mladek
2021-01-26 21:15 ` [PATCH printk-rework 05/12] printk: use seqcount_latch for clear_seq John Ogness
2021-01-26 21:15 ` [PATCH printk-rework 06/12] printk: use atomic64_t for devkmsg_user.seq John Ogness
2021-01-26 21:15 ` [PATCH printk-rework 07/12] printk: add syslog_lock John Ogness
2021-02-01 12:26 ` Petr Mladek
2021-02-01 13:11 ` John Ogness
2021-02-02 12:50 ` Petr Mladek
2021-01-26 21:15 ` [PATCH printk-rework 08/12] printk: introduce a kmsg_dump iterator John Ogness
2021-02-01 13:17 ` Petr Mladek [this message]
2021-02-01 13:32 ` John Ogness
2021-01-26 21:15 ` [PATCH printk-rework 09/12] um: synchronize kmsg_dumper John Ogness
2021-02-01 10:26 ` Petr Mladek
2021-02-01 14:15 ` Petr Mladek
2021-02-01 16:51 ` John Ogness
2021-02-01 16:54 ` Richard Weinberger
2021-02-01 20:25 ` John Ogness
2021-02-01 20:40 ` Richard Weinberger
2021-02-02 13:26 ` Petr Mladek
2021-01-26 21:15 ` [PATCH printk-rework 10/12] hv: " John Ogness
2021-01-27 21:32 ` Michael Kelley
2021-02-01 10:56 ` John Ogness
2021-01-26 21:15 ` [PATCH printk-rework 11/12] printk: remove logbuf_lock John Ogness
2021-02-02 9:15 ` Petr Mladek
2021-02-02 11:41 ` John Ogness
2021-02-02 16:11 ` Petr Mladek
2021-01-26 21:15 ` [PATCH printk-rework 12/12] printk: kmsg_dump: remove _nolock() variants John Ogness
2021-02-02 9:45 ` Petr Mladek
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