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Date:   Wed, 28 Jul 2021 14:13:31 +0100
From:   Matthew Wilcox <willy@infradead.org>
To:     Shivank Garg <shivankgarg98@gmail.com>
Cc:     Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Linux MM <linux-mm@kvack.org>, util-linux@vger.kernel.org
Subject: Re: /proc/pid/sched units
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On Wed, Jul 28, 2021 at 06:26:44PM +0530, Shivank Garg wrote:
> Hi Everyone,
> 
> I'm analyzing the cpu time taken ("se.sum_exec_runtime" in
> /proc/$pid/sched) by process in different configurations for my
> project work. But I was not able to get the time units for the values
> displayed in the file. I tried searching it in source code -
> kernel/sched/cputime.c,include/linux/sched.h etc. but it left me more
> confused.

include/linux/sched/types.h: * @sum_exec_runtime:       total time spent on the CPU, in nanoseconds

why did that leave you more confused?