linux-kernel - Re: [PATCH Resend] cpufreq: governor: remove copy_prev_load from 'struct cpu_dbs_common

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Date:	Mon, 09 Jun 2014 13:33:52 +0200
From:	"Rafael J. Wysocki" <rjw@...ysocki.net>
To:	"Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>,
	Viresh Kumar <viresh.kumar@...aro.org>
Cc:	linaro-kernel@...ts.linaro.org, linux-pm@...r.kernel.org,
	linux-kernel@...r.kernel.org, arvind.chauhan@....com,
	svaidy@...ux.vnet.ibm.com, ego@...ux.vnet.ibm.com, pavel@....cz
Subject: Re: [PATCH Resend] cpufreq: governor: remove copy_prev_load from 'struct cpu_dbs_common_info'

On Monday, June 09, 2014 02:41:12 PM Srivatsa S. Bhat wrote:
> On 06/09/2014 02:21 PM, Viresh Kumar wrote:
> > 'copy_prev_load' was recently added by commit: 18b46ab (cpufreq: governor: Be
> > friendly towards latency-sensitive bursty workloads).
> > 
> > It actually is a bit redundant as we also have 'prev_load' which can store any
> > integer value and can be used instead of 'copy_prev_load' by setting it zero.
> > 
> > True load can also turn out to be zero during long idle intervals (and hence the
> > actual value of 'prev_load' and the overloaded value can clash). However this is
> > not a problem because, if the true load was really zero in the previous
> > interval, it makes sense to evaluate the load afresh for the current interval
> > rather than copying the previous load.
> > 
> > So, drop 'copy_prev_load' and use 'prev_load' instead.
> > 
> > Update comments as well to make it more clear.
> > 
> > There is another change here which was probably missed by Srivatsa during the
> > last version of updates he made. The unlikely in the 'if' statement was covering
> > only half of the condition and the whole line should actually come under it.
> > 
> > Also checkpatch is made more silent as it was reporting this (--strict option):
> > 
> > CHECK: Alignment should match open parenthesis
> > +		if (unlikely(wall_time > (2 * sampling_rate) &&
> > +						j_cdbs->prev_load)) {
> > 
> > Signed-off-by: Viresh Kumar <viresh.kumar@...aro.org>
> > ---
> > Resend: Updated comments/logs as suggested by Srivatsa.
> > 
> 
> Looks good!
> 
> Reviewed-by: Srivatsa S. Bhat <srivatsa.bhat@...ux.vnet.ibm.com>

Applied to bleeding-edge, thanks!

-- 
I speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.
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