linux-kernel - Re: [PATCH 0/6] cpufreq: Add 'load_table' debugfs file to show colleced CPUs load

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Tue, 09 Jul 2013 16:57:03 +0900
From:	Chanwoo Choi <cw00.choi@...sung.com>
To:	Viresh Kumar <viresh.kumar@...aro.org>
Cc:	rjw@...k.pl, linux-kernel@...r.kernel.org,
	linux-pm@...r.kernel.org, cpufreq@...r.kernel.org,
	kyungmin.park@...sung.com, myungjoo.ham@...sung.com
Subject: Re: [PATCH 0/6] cpufreq: Add 'load_table' debugfs file to show
 colleced CPUs load

On 07/09/2013 03:50 PM, Viresh Kumar wrote:
> On 5 July 2013 14:16, Chanwoo Choi <cw00.choi@...sung.com> wrote:
>> Second, previous performance/powersave governor haven't calculated CPUs load
>> becuase these governor didn't change CPU frequency according to CPUs load. But,
>> load_table debugfs file always should indicate the collected CPUs data regardless
>> of the kind of cpufreq governor. So, the patch3/4/5 implement that performance/
>> powersave governor will check periodically CPUs load by calling dbs_check_cpu()
>> with timer.
> 
> I raised a query on how can we call dbs_check_cpu() from
> performance/powersave? Also, calling this routine will degrade
> performance without any sense. So, I vote not for doing it.

You're right. The performance/powersave don't usually need calling operation
of dbs_check_cpu(). Only, this patch aims at checking CPUs load on
load_table debugfs file.

I'm going to consider more efficient way than this patchset.
For example, 

But, following patctes haven't the dependency about upper description about performance/powersave.
If user changes cpufreq governor from ondemand/conservative to performance/powersave,
patch2 did reset all of the data for load_table.

  cpufreq: Add debugfs directory for cpufreq
  cpufreq: stats: Add 'load_table' debugfs file to show accumulated data of CPUs
  Documentation: cpufreq: load_table: Update load_table debugfs file documentation

So, I'd like you to review patch1,patch2, patch6. If you with that I resend patch1/2/6,
I will resend new patchset incluing in patch1/2/6.

Thanks,

Best Regards,
Chanwoo Choi

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/