linux-kernel - Re: [PATCH 0/2] cpufreq: cpufreq_driver

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]

Message-ID: <2765418.Ft0GYkgNgL@vostro.rjw.lan>
Date:	Tue, 05 Feb 2013 02:07:18 +0100
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Nathan Zimmer <nzimmer@....com>,
	Viresh Kumar <viresh.kumar@...aro.org>
Cc:	linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org,
	cpufreq@...r.kernel.org, Shawn Guo <shawn.guo@...aro.org>
Subject: Re: [PATCH 0/2] cpufreq: cpufreq_driver_lock is hot on large systems

On Monday, February 04, 2013 04:45:11 PM Nathan Zimmer wrote:
> I am noticing the cpufreq_driver_lock is quite hot.
> On an idle 512 system perf shows me most of the system time is spent on this
> lock.  This is quite signifigant as top shows 5% of time in system time.
> My solution was to first convert the lock to a rwlock and then to the rcu.
> 
> 
> Nathan Zimmer (2):
>   cpufreq: Convert the cpufreq_driver_lock to a rwlock
>   cpufreq: Convert the cpufreq_driver_lock to use the rcu
> 
>  drivers/cpufreq/cpufreq.c | 139 ++++++++++++++++++++++++++--------------------
>  1 file changed, 79 insertions(+), 60 deletions(-)

I like these changes.

Viresh, anyone, any comments?

Rafael


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