From: Borislav Petkov <bp@amd64.org>
To: Dominik Brodowski <linux@dominikbrodowski.net>
Cc: Thomas Renninger <trenn@suse.de>,
akpm@linux-foundation.org, davej@redhat.com,
cpufreq@vger.kernel.org, x86@kernel.org,
linux-kernel@vger.kernel.org, "H. Peter Anvin" <hpa@zytor.com>
Subject: Re: [PATCH 2/5] powernow-k8: Add core performance boost support
Date: Tue, 23 Mar 2010 15:19:34 +0100 [thread overview]
Message-ID: <20100323141934.GF16493@aftab> (raw)
In-Reply-To: <20100323132737.GA8894@isilmar.linta.de>
From: Dominik Brodowski <linux@dominikbrodowski.net>
Date: Tue, Mar 23, 2010 at 02:27:37PM +0100
Hi Dominik,
> On Tue, Mar 23, 2010 at 12:58:58PM +0100, Borislav Petkov wrote:
> > > It could already be set in arch/x86/kernel/cpu/amd.c and
> > > powernow-k8 could use cpu_has(cpu, X86_FEATURE_CPB);
> >
> > I'd still like to cache the cpb_capable value locally instead of getting
> > x86_cpuinfo percpu var and querying it. Especially if this happens often
> > and not only at driver init.
>
> If it's a percpu var, isn't it local anyway?
I meant driver-local. So that I don't have to deref even the per_cpu var
and thus save some cycles.
--
Regards/Gruss,
Boris.
--
Advanced Micro Devices, Inc.
Operating Systems Research Center
next prev parent reply other threads:[~2010-03-23 14:19 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-03-22 18:38 [PATCH 0/5] powernow-k8: Core Performance Boost and effective frequency support Borislav Petkov
2010-03-22 18:38 ` [PATCH 1/5] cpufreq: Unify sysfs attribute definition macros Borislav Petkov
2010-03-23 11:07 ` Thomas Renninger
2010-03-23 11:44 ` Borislav Petkov
2010-03-23 11:55 ` Thomas Renninger
2010-03-23 12:05 ` Borislav Petkov
2010-03-23 12:30 ` Thomas Renninger
2010-03-22 18:38 ` [PATCH 2/5] powernow-k8: Add core performance boost support Borislav Petkov
2010-03-23 11:17 ` Thomas Renninger
2010-03-23 11:58 ` Borislav Petkov
2010-03-23 13:27 ` Dominik Brodowski
2010-03-23 14:19 ` Borislav Petkov [this message]
2010-03-23 14:47 ` Dominik Brodowski
2010-03-23 16:26 ` Borislav Petkov
2010-03-22 18:38 ` [PATCH 3/5] cpufreq: Add APERF/MPERF support for AMD processors Borislav Petkov
2010-03-23 11:26 ` Thomas Renninger
2010-03-23 11:59 ` Borislav Petkov
2010-03-22 18:38 ` [PATCH 4/5] powernow-k8: Fix frequency reporting Borislav Petkov
2010-03-22 18:38 ` [PATCH 5/5] cpufreq: Add support for actual freq Borislav Petkov
2010-03-23 11:51 ` Thomas Renninger
2010-03-23 14:23 ` Borislav Petkov
2010-03-23 14:41 ` Dominik Brodowski
2010-03-23 15:12 ` Thomas Renninger
2010-03-24 14:02 ` Borislav Petkov
-- strict thread matches above, loose matches on Subject: below --
2010-03-24 17:46 [PATCH 0/5] powernow-k8: Core Performance Boost and effective frequency support Borislav Petkov
2010-03-24 17:46 ` [PATCH 2/5] powernow-k8: Add core performance boost support Borislav Petkov
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