linux-kernel - Re: [PATCH] PM / suspend: measure the time of filesystem syncing

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Date:   Wed, 6 Feb 2019 14:52:06 +0000
From:   "Pan, Harry" <harry.pan@...el.com>
To:     "rjw@...ysocki.net" <rjw@...ysocki.net>
CC:     "Brown, Len" <len.brown@...el.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "gs0622@...il.com" <gs0622@...il.com>,
        "pavel@....cz" <pavel@....cz>,
        "linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>
Subject: Re: [PATCH] PM / suspend: measure the time of filesystem syncing

On Tue, 2019-02-05 at 12:55 +0100, Rafael J. Wysocki wrote:
> 
> > +	ktime_t start, end, elapsed;
> 
> Why do you need three vars here?  One should be sufficient.
...
> > +	start = ktime_get_boottime();
> 
> Why _boottime()?
> 
Yes, I agree both comments.

BTW, The initial idea came from processes freezing, apology my sketchy
imitation not considering the context well to choose a proper API.

-Harry