linux-kernel - Re: [ARM64] Printing IRQ stack usage information

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Message-ID: <5997.1542386778@turing-police.cc.vt.edu>
Date:   Fri, 16 Nov 2018 11:46:18 -0500
From:   valdis.kletnieks@...edu
To:     Pintu Agarwal <pintu.ping@...il.com>
Cc:     open list <linux-kernel@...r.kernel.org>,
        linux-arm-kernel@...ts.infradead.org,
        Russell King - ARM Linux <linux@...linux.org.uk>,
        kernelnewbies@...nelnewbies.org,
        Jungseok Lee <jungseoklee85@...il.com>,
        catalin.marinas@....com, will.deacon@....com,
        Takahiro Akashi <takahiro.akashi@...aro.org>,
        mark.rutland@....com, Sungjinn Chung <barami97@...il.com>
Subject: Re: [ARM64] Printing IRQ stack usage information

On Fri, 16 Nov 2018 20:10:28 +0530, Pintu Agarwal said:

> > Look at the code controlled by '#ifdef CONFIG_DEBUG_STACK_USAGE'

> For example: is it possible to keep storing the irq_stack_usage (for
> each cpu in a variable) information from boot time, and then use this
> variable to dump the irq_stack information, after the system booted,
> may be from proc entry ?

Congrats. You just re-invented DEBUG_STACK_USAGE, which just keeps a high-water mark
for stack usage.

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