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

[Sergey Senozhatsky]

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