linux-kernel - [PATCHv3 0/2] *** Detect interrupt storm in softlockup ***

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Date: Thu,  1 Feb 2024 01:17:36 +0800
From: Bitao Hu <yaoma@...ux.alibaba.com>
To: dianders@...omium.org,
	akpm@...ux-foundation.org,
	pmladek@...e.com,
	kernelfans@...il.com,
	liusong@...ux.alibaba.com
Cc: linux-kernel@...r.kernel.org,
	yaoma@...ux.alibaba.com
Subject: [PATCHv3 0/2] *** Detect interrupt storm in softlockup ***

Hi, guys.
I have implemented a low-overhead method for detecting interrupt storm
in softlockup. Please review it, all comments are welcome.

Changes from v2 to v3:

- From Liu Song, using enum instead of macro for cpu_stats, shortening
the name 'idx_to_stat' to 'stats', adding 'get_16bit_precesion' instead
of using right shift operations, and using 'struct irq_counts'.

- From kernel robot test, using '__this_cpu_read' and '__this_cpu_write'
instead of accessing to an per-cpu array directly, in order to avoid
this warning.
'sparse: incorrect type in initializer (different modifiers)'

Changes from v1 to v2:

- From Douglas, optimize the memory of cpustats. With the maximum number
of CPUs, that's now this.
2 * 8192 * 4 + 1 * 8192 * 5 * 4 + 1 * 8192 = 237,568 bytes.

- From Liu Song, refactor the code format and add necessary comments.

- From Douglas, use interrupt counts instead of interrupt time to
determine the cause of softlockup.

- Remove the cmdline parameter added in PATCHv1.

Bitao Hu (2):
  watchdog/softlockup: low-overhead detection of interrupt storm
  watchdog/softlockup: report the most frequent interrupts

 kernel/watchdog.c | 240 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 240 insertions(+)

-- 
2.37.1 (Apple Git-137.1)