linux-kernel - Re: [PATCH] PM / Hibernate: Migrate to ktime

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Message-ID: <20141030181829.GB14412@amd>
Date:	Thu, 30 Oct 2014 19:18:29 +0100
From:	Pavel Machek <pavel@....cz>
To:	Tina Ruchandani <ruchandani.tina@...il.com>
Cc:	len.brown@...el.com, linux-pm@...r.kernel.org,
	linux-kernel@...r.kernel.org, arnd@...db.de,
	opw-kernel@...glegroups.com, rjw@...ysocki.net
Subject: Re: [PATCH] PM / Hibernate: Migrate to ktime_t

On Thu 2014-10-30 11:04:53, Tina Ruchandani wrote:
> This patch migrates swsusp_show_speed and its callers to using ktime_t instead
> of 'struct timeval' which suffers from the y2038 problem.
> 
> Changes to swsusp_show_speed:
>         - use ktime_t for start and stop times
>         - pass start and stop times by value
> Calling functions affected:
>         - load_image
>         - load_image_lzo
>         - save_image
>         - save_image_lzo
>         - hibernate_preallocate_memory
> Design decisions:
>         - use ktime_t to preserve same granularity of reporting as before
>         - use centisecs logic as before to avoid 'div by zero' issues caused by
>           using seconds and nanoseconds directly
>         - use monotonic time (ktime_get()) since we only care about elapsed time.
> 
> Signed-off-by: Tina Ruchandani <ruchandani.tina@...il.com>
> Suggested-by: Arnd Bergmann <arnd@...db.de>

Acked-by: Pavel Machek <pavel@....cz> 

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