[PATCH 0/3] warn and suppress irqflood

[Pingfan Liu]

I hit a irqflood bug on powerpc platform, and two years ago, on a x86 platform.
When the bug happens, the kernel is totally occupies by irq.  Currently, there
may be nothing or just soft lockup warning showed in console. It is better
to warn users with irq flood info.

In the kdump case, the kernel can move on by suppressing the irq flood.

Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Jisheng Zhang <Jisheng.Zhang@xxxxxxxxxxxxx>
Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Cc: "Guilherme G. Piccoli" <gpiccoli@xxxxxxxxxxxxx>
Cc: Petr Mladek <pmladek@xxxxxxxx>
Cc: Marc Zyngier <maz@xxxxxxxxxx>
Cc: Linus Walleij <linus.walleij@xxxxxxxxxx>
Cc: afzal mohammed <afzal.mohd.ma@xxxxxxxxx>
Cc: Lina Iyer <ilina@xxxxxxxxxxxxxx>
Cc: "Gustavo A. R. Silva" <gustavo@xxxxxxxxxxxxxx>
Cc: Maulik Shah <mkshah@xxxxxxxxxxxxxx>
Cc: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
Cc: Jonathan Corbet <corbet@xxxxxxx>
Cc: Pawan Gupta <pawan.kumar.gupta@xxxxxxxxxxxxxxx>
Cc: Mike Kravetz <mike.kravetz@xxxxxxxxxx>
Cc: Oliver Neukum <oneukum@xxxxxxxx>
To: linux-kernel@xxxxxxxxxxxxxxx
Cc: linux-doc@xxxxxxxxxxxxxxx
Cc: kexec@xxxxxxxxxxxxxxxxxxx

Pingfan Liu (3):
  kernel/watchdog: show irq percentage if irq floods
  kernel/watchdog: suppress max irq when irq floods
  Documentation: introduce a param "irqflood_suppress"

 Documentation/admin-guide/kernel-parameters.txt |  3 ++
 include/linux/irq.h                             |  2 ++
 kernel/irq/spurious.c                           | 32 +++++++++++++++++
 kernel/watchdog.c                               | 48 +++++++++++++++++++++++++
 4 files changed, 85 insertions(+)

-- 
2.7.5