linux-kernel - [PATCH 0/3] *** Detect interrupt storm in softlockup ***

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Date: Tue, 23 Jan 2024 20:12:20 +0800
From: Bitao Hu <yaoma@...ux.alibaba.com>
To: dianders@...omium.org,
	akpm@...ux-foundation.org,
	pmladek@...e.com,
	tglx@...utronix.de,
	maz@...nel.org,
	liusong@...ux.alibaba.com
Cc: linux-kernel@...r.kernel.org,
	Bitao Hu <yaoma@...ux.alibaba.com>
Subject: [PATCH 0/3] *** Detect interrupt storm in softlockup ***

Hi guys,
    I have previously encountered an issue where an NVMe interrupt
storm caused a softlockup, but the call tree did not provide useful
information. This is because the call tree is merely a snapshot and
does not fully reflect the CPU's state over the duration of the
softlockup_thresh period. Consequently, I think that reporting CPU
utilization (system, softirq, hardirq, idle) during a softlockup would
be beneficial for identifying issues related to interrupt storms, as
well as assisting in the analysis of other causes of softlockup.
    Furthermore, reporting the most time-consuming hardirqs during a
softlockup could directly pinpoint which interrupt is responsible
for the issue.

Bitao Hu (3):
  watchdog/softlockup: low-overhead detection of interrupt storm
  watchdog/softlockup: report the most time-consuming hardirq
  watchdog/softlockup: add parameter to control the reporting of
    time-consuming hardirq

 include/linux/irq.h     |   9 ++
 include/linux/irqdesc.h |   2 +
 kernel/irq/irqdesc.c    |   9 +-
 kernel/watchdog.c       | 289 ++++++++++++++++++++++++++++++++++++++++
 4 files changed, 308 insertions(+), 1 deletion(-)

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