linux-kernel - [RFC][PATCHv3 0/5] printk: introduce printing kernel thread

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Date:   Tue,  9 May 2017 17:28:54 +0900
From:   Sergey Senozhatsky <sergey.senozhatsky@...il.com>
To:     Petr Mladek <pmladek@...e.com>,
        Steven Rostedt <rostedt@...dmis.org>
Cc:     Jan Kara <jack@...e.cz>, Andrew Morton <akpm@...ux-foundation.org>,
        Peter Zijlstra <peterz@...radead.org>,
        "Rafael J . Wysocki" <rjw@...ysocki.net>,
        Eric Biederman <ebiederm@...ssion.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jslaby@...e.com>, Pavel Machek <pavel@....cz>,
        Andreas Mohr <andi@...as.de>,
        Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>,
        linux-kernel@...r.kernel.org,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>
Subject: [RFC][PATCHv3 0/5] printk: introduce printing kernel thread

Hello,


	RFC


	This patch set adds a printk() kernel thread which lets us to
print kernel messages to the console from a non-atomic/schedule-able
context, avoiding different sort of lockups, stalls, etc.


	A completely reworked version, for more details please
see 0003 commit message and code comments/documentation.


v2->v3 (Petr, Pavel, Andreas):
-- rework offloading
-- use PM notifiers
-- dropped some patches, etc. etc.

v1->v2:
-- introduce printk_emergency mode and API to switch it on/off
-- move printk_pending out of per-CPU memory
-- add printk emergency_mode sysfs node
-- switch sysrq handlers (some of them) to printk_emergency
-- cleanus/etc.

Sergey Senozhatsky (5):
  printk: move printk_pending out of per-cpu
  printk: introduce printing kernel thread
  printk: add enforce_emergency parameter
  printk: enable printk offloading
  printk: register PM notifier

 include/linux/console.h |   3 +
 kernel/printk/printk.c  | 296 ++++++++++++++++++++++++++++++++++++++++++++----
 2 files changed, 279 insertions(+), 20 deletions(-)

-- 
2.12.2