| Message ID | 1399473888-12947-7-git-send-email-haojian.zhuang@linaro.org (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
On Wed, May 07, 2014 at 10:44:40PM +0800, Haojian Zhuang wrote: > Add the CONFIG_MCPM_QUAD_CLUSTER configuration to enlarge cluster number > from 2 to 4. > > Signed-off-by: Haojian Zhuang <haojian.zhuang@linaro.org> > --- > arch/arm/Kconfig | 9 +++++++++ > arch/arm/include/asm/mcpm.h | 5 +++++ > 2 files changed, 14 insertions(+) > > diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig > index 0e52a2c..624829f 100644 > --- a/arch/arm/Kconfig > +++ b/arch/arm/Kconfig > @@ -1575,6 +1575,15 @@ config MCPM > for (multi-)cluster based systems, such as big.LITTLE based > systems. > > +config MCPM_QUAD_CLUSTER > + bool "Enable Quad clusters in MCPM" > + depends on MCPM > + help > + To avoid wasting resources unnecessarily, MCPM only supports up > + to 2 clusters by default. > + Platforms with 3 or 4 clusters that use MCPM must select this > + option to allow the additional clusters to be managed. > + Why don't you add an integer config instead, i.e. MCPM_MAX_CLUSTERS, and let that set MAX_NR_CLUSTERS? -Olof
On Wed, 7 May 2014, Haojian Zhuang wrote: > Add the CONFIG_MCPM_QUAD_CLUSTER configuration to enlarge cluster number > from 2 to 4. > > Signed-off-by: Haojian Zhuang <haojian.zhuang@linaro.org> > --- > arch/arm/Kconfig | 9 +++++++++ > arch/arm/include/asm/mcpm.h | 5 +++++ > 2 files changed, 14 insertions(+) > > diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig > index 0e52a2c..624829f 100644 > --- a/arch/arm/Kconfig > +++ b/arch/arm/Kconfig > @@ -1575,6 +1575,15 @@ config MCPM > for (multi-)cluster based systems, such as big.LITTLE based > systems. > > +config MCPM_QUAD_CLUSTER > + bool "Enable Quad clusters in MCPM" Please remove the prompt string, keeping only the bool alone. This config option shouldn't be visible to users. After that you may add: Reviewed-by: Nicolas Pitre <nico@linaro.org> > + depends on MCPM > + help > + To avoid wasting resources unnecessarily, MCPM only supports up > + to 2 clusters by default. > + Platforms with 3 or 4 clusters that use MCPM must select this > + option to allow the additional clusters to be managed. > + > config BIG_LITTLE > bool "big.LITTLE support (Experimental)" > depends on CPU_V7 && SMP > diff --git a/arch/arm/include/asm/mcpm.h b/arch/arm/include/asm/mcpm.h > index 608516e..fc8d70d 100644 > --- a/arch/arm/include/asm/mcpm.h > +++ b/arch/arm/include/asm/mcpm.h > @@ -20,7 +20,12 @@ > * to consider dynamic allocation. > */ > #define MAX_CPUS_PER_CLUSTER 4 > + > +#ifdef CONFIG_MCPM_QUAD_CLUSTER > +#define MAX_NR_CLUSTERS 4 > +#else > #define MAX_NR_CLUSTERS 2 > +#endif > > #ifndef __ASSEMBLY__ > > -- > 1.9.1 >
On Wed, 7 May 2014, Olof Johansson wrote: > On Wed, May 07, 2014 at 10:44:40PM +0800, Haojian Zhuang wrote: > > Add the CONFIG_MCPM_QUAD_CLUSTER configuration to enlarge cluster number > > from 2 to 4. > > > > Signed-off-by: Haojian Zhuang <haojian.zhuang@linaro.org> > > --- > > arch/arm/Kconfig | 9 +++++++++ > > arch/arm/include/asm/mcpm.h | 5 +++++ > > 2 files changed, 14 insertions(+) > > > > diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig > > index 0e52a2c..624829f 100644 > > --- a/arch/arm/Kconfig > > +++ b/arch/arm/Kconfig > > @@ -1575,6 +1575,15 @@ config MCPM > > for (multi-)cluster based systems, such as big.LITTLE based > > systems. > > > > +config MCPM_QUAD_CLUSTER > > + bool "Enable Quad clusters in MCPM" > > + depends on MCPM > > + help > > + To avoid wasting resources unnecessarily, MCPM only supports up > > + to 2 clusters by default. > > + Platforms with 3 or 4 clusters that use MCPM must select this > > + option to allow the additional clusters to be managed. > > + > > Why don't you add an integer config instead, i.e. MCPM_MAX_CLUSTERS, and let > that set MAX_NR_CLUSTERS? I requested for this config symbol not to be visible to users (the prompt string should be removed) and be selected by those platforms that need it instead. And there is no way to specify an actual value with 'select'. And that wouldn't work in a multi-platform config where different platforms could fight over a different value anyway. I also prefer to keep some control on the actual number that can be used here so not to let people go overboard with it. If this grows too big we'll have to consider some dynamic allocation instead. See previous discussion here: http://article.gmane.org/gmane.linux.ports.arm.kernel/315228 Nicolas
On Wed, May 7, 2014 at 11:00 AM, Nicolas Pitre <nicolas.pitre@linaro.org> wrote: > On Wed, 7 May 2014, Olof Johansson wrote: > >> On Wed, May 07, 2014 at 10:44:40PM +0800, Haojian Zhuang wrote: >> > Add the CONFIG_MCPM_QUAD_CLUSTER configuration to enlarge cluster number >> > from 2 to 4. >> > >> > Signed-off-by: Haojian Zhuang <haojian.zhuang@linaro.org> >> > --- >> > arch/arm/Kconfig | 9 +++++++++ >> > arch/arm/include/asm/mcpm.h | 5 +++++ >> > 2 files changed, 14 insertions(+) >> > >> > diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig >> > index 0e52a2c..624829f 100644 >> > --- a/arch/arm/Kconfig >> > +++ b/arch/arm/Kconfig >> > @@ -1575,6 +1575,15 @@ config MCPM >> > for (multi-)cluster based systems, such as big.LITTLE based >> > systems. >> > >> > +config MCPM_QUAD_CLUSTER >> > + bool "Enable Quad clusters in MCPM" >> > + depends on MCPM >> > + help >> > + To avoid wasting resources unnecessarily, MCPM only supports up >> > + to 2 clusters by default. >> > + Platforms with 3 or 4 clusters that use MCPM must select this >> > + option to allow the additional clusters to be managed. >> > + >> >> Why don't you add an integer config instead, i.e. MCPM_MAX_CLUSTERS, and let >> that set MAX_NR_CLUSTERS? > > I requested for this config symbol not to be visible to users (the > prompt string should be removed) and be selected by those platforms that > need it instead. And there is no way to specify an actual value with > 'select'. And that wouldn't work in a multi-platform config where > different platforms could fight over a different value anyway. > > I also prefer to keep some control on the actual number that can be used > here so not to let people go overboard with it. If this grows too big > we'll have to consider some dynamic allocation instead. > > See previous discussion here: > > http://article.gmane.org/gmane.linux.ports.arm.kernel/315228 Ok, fair enough. -Olof
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig index 0e52a2c..624829f 100644 --- a/arch/arm/Kconfig +++ b/arch/arm/Kconfig @@ -1575,6 +1575,15 @@ config MCPM for (multi-)cluster based systems, such as big.LITTLE based systems. +config MCPM_QUAD_CLUSTER + bool "Enable Quad clusters in MCPM" + depends on MCPM + help + To avoid wasting resources unnecessarily, MCPM only supports up + to 2 clusters by default. + Platforms with 3 or 4 clusters that use MCPM must select this + option to allow the additional clusters to be managed. + config BIG_LITTLE bool "big.LITTLE support (Experimental)" depends on CPU_V7 && SMP diff --git a/arch/arm/include/asm/mcpm.h b/arch/arm/include/asm/mcpm.h index 608516e..fc8d70d 100644 --- a/arch/arm/include/asm/mcpm.h +++ b/arch/arm/include/asm/mcpm.h @@ -20,7 +20,12 @@ * to consider dynamic allocation. */ #define MAX_CPUS_PER_CLUSTER 4 + +#ifdef CONFIG_MCPM_QUAD_CLUSTER +#define MAX_NR_CLUSTERS 4 +#else #define MAX_NR_CLUSTERS 2 +#endif #ifndef __ASSEMBLY__
Add the CONFIG_MCPM_QUAD_CLUSTER configuration to enlarge cluster number from 2 to 4. Signed-off-by: Haojian Zhuang <haojian.zhuang@linaro.org> --- arch/arm/Kconfig | 9 +++++++++ arch/arm/include/asm/mcpm.h | 5 +++++ 2 files changed, 14 insertions(+)