netdev - Re: [PATCH net-next v11 1/7] sched: Add Common Applications Kept Enhanced (cake) qdisc

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Date:   Wed, 16 May 2018 20:34:11 +0200
From:   Toke Høiland-Jørgensen <toke@...e.dk>
To:     David Miller <davem@...emloft.net>
Cc:     netdev@...r.kernel.org, cake@...ts.bufferbloat.net
Subject: Re: [PATCH net-next v11 1/7] sched: Add Common Applications Kept Enhanced (cake) qdisc

David Miller <davem@...emloft.net> writes:

> From: Toke Høiland-Jørgensen <toke@...e.dk>
> Date: Tue, 15 May 2018 17:12:44 +0200
>
>> +typedef u64 cobalt_time_t;
>> +typedef s64 cobalt_tdiff_t;
>  ...
>> +static cobalt_time_t cobalt_get_time(void)
>> +{
>> +	return ktime_get_ns();
>> +}
>> +
>> +static u32 cobalt_time_to_us(cobalt_time_t val)
>> +{
>> +	do_div(val, NSEC_PER_USEC);
>> +	return (u32)val;
>> +}
>
> If fundamentally you are working with ktime_t values, please use that type
> and the associated helpers.
>
> This is a valid argument that using custom typedefs provide documentation
> and an aid to understanding, but I think it doesn't serve that purpose
> very well here.
>
> So please just use ktime_t throughout instead of this cobalt_time_t
> and cobalt_tdiff_t.  And then use helpers like ktime_to_us() which
> properly optimize for 64-bit vs. 32-bit hosts.

Can do :)

-Toke