From: Santosh Shilimkar <santosh.shilimkar@ti.com>
To: Rob Herring <robherring2@gmail.com>
Cc: linux-arm-kernel@lists.infradead.org,
Russell King <rmk+kernel@arm.linux.org.uk>,
linux-omap@vger.kernel.org,
Linus Walleij <linus.walleij@stericsson.com>
Subject: RE: [PATCH] ARM: smp: Introduce ARCH_HAS_COMMON_CORES_CLOCK to speed-up boot
Date: Thu, 20 Jan 2011 21:06:35 +0530 [thread overview]
Message-ID: <43c027bd53818ab19bdc1c823aa21ea4@mail.gmail.com> (raw)
In-Reply-To: <4D385155.4050301@gmail.com>
> -----Original Message-----
> From: Rob Herring [mailto:robherring2@gmail.com]
> Sent: Thursday, January 20, 2011 8:44 PM
> To: Santosh Shilimkar
> Cc: linux-arm-kernel@lists.infradead.org; Russell King; linux-
> omap@vger.kernel.org; Linus Walleij
> Subject: Re: [PATCH] ARM: smp: Introduce ARCH_HAS_COMMON_CORES_CLOCK
> to speed-up boot
>
> On 01/20/2011 03:42 AM, Santosh Shilimkar wrote:
> > On some architectures, secondary cores shares clock with primiary
> > core and hence scale together. Hence secondary core lpj
> calibration
> > is not necessary and can be skipped to save considerable time.
> >
> > This can speed up the secondary cpu boot and hotplug cpu online
> > paths.
> >
> > Discussion thread:
> > http://www.spinics.net/lists/arm-kernel/msg111124.html
> >
>
> There's already one way to do this with pre-calculated lpj.
>
How about the hot-plug path? This is not for just boot.
> Also, this isn't multi-platform friendly. You could accomplish the
> same
> thing using the clock api to get the core frequency of each core and
> only calculate lpj if the frequency is different.
May be but what's wrong with the obvious approach which is
completely non-intrusive.
Why is not multi-platform friendly ?
Archs can choose not to select this option.
Regards,
Santosh
WARNING: multiple messages have this Message-ID (diff)
From: santosh.shilimkar@ti.com (Santosh Shilimkar)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH] ARM: smp: Introduce ARCH_HAS_COMMON_CORES_CLOCK to speed-up boot
Date: Thu, 20 Jan 2011 21:06:35 +0530 [thread overview]
Message-ID: <43c027bd53818ab19bdc1c823aa21ea4@mail.gmail.com> (raw)
In-Reply-To: <4D385155.4050301@gmail.com>
> -----Original Message-----
> From: Rob Herring [mailto:robherring2 at gmail.com]
> Sent: Thursday, January 20, 2011 8:44 PM
> To: Santosh Shilimkar
> Cc: linux-arm-kernel at lists.infradead.org; Russell King; linux-
> omap at vger.kernel.org; Linus Walleij
> Subject: Re: [PATCH] ARM: smp: Introduce ARCH_HAS_COMMON_CORES_CLOCK
> to speed-up boot
>
> On 01/20/2011 03:42 AM, Santosh Shilimkar wrote:
> > On some architectures, secondary cores shares clock with primiary
> > core and hence scale together. Hence secondary core lpj
> calibration
> > is not necessary and can be skipped to save considerable time.
> >
> > This can speed up the secondary cpu boot and hotplug cpu online
> > paths.
> >
> > Discussion thread:
> > http://www.spinics.net/lists/arm-kernel/msg111124.html
> >
>
> There's already one way to do this with pre-calculated lpj.
>
How about the hot-plug path? This is not for just boot.
> Also, this isn't multi-platform friendly. You could accomplish the
> same
> thing using the clock api to get the core frequency of each core and
> only calculate lpj if the frequency is different.
May be but what's wrong with the obvious approach which is
completely non-intrusive.
Why is not multi-platform friendly ?
Archs can choose not to select this option.
Regards,
Santosh
next prev parent reply other threads:[~2011-01-20 15:36 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-01-20 9:42 [PATCH] ARM: smp: Introduce ARCH_HAS_COMMON_CORES_CLOCK to speed-up boot Santosh Shilimkar
2011-01-20 9:42 ` Santosh Shilimkar
2011-01-20 15:14 ` Rob Herring
2011-01-20 15:14 ` Rob Herring
2011-01-20 15:36 ` Santosh Shilimkar [this message]
2011-01-20 15:36 ` Santosh Shilimkar
2011-01-20 16:34 ` Rob Herring
2011-01-20 16:34 ` Rob Herring
2011-01-21 13:43 ` Santosh Shilimkar
2011-01-21 13:43 ` Santosh Shilimkar
2011-01-21 14:23 ` Linus Walleij
2011-01-21 14:23 ` Linus Walleij
2011-01-21 15:00 ` Rob Herring
2011-01-21 15:00 ` Rob Herring
2011-01-21 17:15 ` Russell King - ARM Linux
2011-01-21 17:15 ` Russell King - ARM Linux
2011-01-22 7:44 ` [PATCH] ARM: smp: Introduce ARCH_HAS_COMMON_CORES_CLOCK tospeed-up boot Santosh Shilimkar
2011-01-22 7:44 ` Santosh Shilimkar
2011-01-22 21:20 ` Russell King - ARM Linux
2011-01-22 21:20 ` Russell King - ARM Linux
2011-01-23 7:25 ` [PATCH] ARM: smp: Introduce ARCH_HAS_COMMON_CORES_CLOCKtospeed-up boot Santosh Shilimkar
2011-01-23 7:25 ` Santosh Shilimkar
2011-01-21 17:08 ` [PATCH] ARM: smp: Introduce ARCH_HAS_COMMON_CORES_CLOCK to speed-up boot Russell King - ARM Linux
2011-01-21 17:08 ` Russell King - ARM Linux
2011-01-20 16:21 ` Linus Walleij
2011-01-20 16:21 ` Linus Walleij
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