* [PATCH] ppc64: select HAVE_CONTEXT_TRACKING by default
@ 2015-12-09 22:43 Yang Shi
2016-01-04 22:19 ` Shi, Yang
0 siblings, 1 reply; 2+ messages in thread
From: Yang Shi @ 2015-12-09 22:43 UTC (permalink / raw)
To: benh, paulus, mpe; +Cc: linux-kernel, linuxppc-dev, linaro-kernel, yang.shi
The functionality of context tracking has been implemented by PPC64 and
HAVE_CONTEXT_TRACKING was selected by pseries by default.
Actually, it is applicale to all PPC64 platforms, so select it in PPC64
generic Kconfig.
NO_HZ_FULL depends on it, with this change NO_HZ_FULL could be enabled
for all PPC64 machines.
Signed-off-by: Yang Shi <yang.shi@linaro.org>
---
Following the instruction in Documentation/timers/NO_HZ.txt, I tested full nohz
on my FSL T2080 target, the below trace log shows it works well.
user_loop-574 [001] d..1 137.044892: tick_stop: success=yes msg=
user_loop-574 [001] d.h1 138.044880: hrtimer_expire_entry: hrtimer=c00000007fd22d10 function=.tick_sched_timer now=137796002092
user_loop-574 [001] d.h1 139.044880: hrtimer_expire_entry: hrtimer=c00000007fd22d10 function=.tick_sched_timer now=138796002129
user_loop-574 [001] d.h1 140.044880: hrtimer_expire_entry: hrtimer=c00000007fd22d10 function=.tick_sched_timer now=139796002219
user_loop-574 [001] d.h1 141.044880: hrtimer_expire_entry: hrtimer=c00000007fd22d10 function=.tick_sched_timer now=140796002229
user_loop-574 [001] d.h1 142.044879: hrtimer_expire_entry: hrtimer=c00000007fd22d10 function=.tick_sched_timer now=141796002159
user_loop-574 [001] d.h1 143.044879: hrtimer_expire_entry: hrtimer=c00000007fd22d10 function=.tick_sched_timer now=142796002142
user_loop-574 [001] d.h1 144.044878: hrtimer_expire_entry: hrtimer=c00000007fd22d10 function=.tick_sched_timer now=143796002046
user_loop-574 [001] d.h1 145.044878: hrtimer_expire_entry: hrtimer=c00000007fd22d10 function=.tick_sched_timer now=144796002189
user_loop-574 [001] d.h1 146.044878: hrtimer_expire_entry: hrtimer=c00000007fd22d10 function=.tick_sched_timer now=145796002199
user_loop-574 [001] d.h1 147.044880: hrtimer_expire_entry: hrtimer=c00000007fd22d10 function=.tick_sched_timer now=146796003836
It shows the timer tick just comes in every second.
It should be low risk to have problem on other PPC64 targets, although they are
not tested.
arch/powerpc/platforms/Kconfig.cputype | 1 +
arch/powerpc/platforms/pseries/Kconfig | 1 -
2 files changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/powerpc/platforms/Kconfig.cputype b/arch/powerpc/platforms/Kconfig.cputype
index 142dff5..7b25dd1 100644
--- a/arch/powerpc/platforms/Kconfig.cputype
+++ b/arch/powerpc/platforms/Kconfig.cputype
@@ -3,6 +3,7 @@ config PPC64
default n
select HAVE_VIRT_CPU_ACCOUNTING
select ZLIB_DEFLATE
+ select HAVE_CONTEXT_TRACKING
help
This option selects whether a 32-bit or a 64-bit kernel
will be built.
diff --git a/arch/powerpc/platforms/pseries/Kconfig b/arch/powerpc/platforms/pseries/Kconfig
index bec90fb..6853148 100644
--- a/arch/powerpc/platforms/pseries/Kconfig
+++ b/arch/powerpc/platforms/pseries/Kconfig
@@ -17,7 +17,6 @@ config PPC_PSERIES
select PPC_UDBG_16550
select PPC_NATIVE
select PPC_DOORBELL
- select HAVE_CONTEXT_TRACKING
select HOTPLUG_CPU if SMP
select ARCH_RANDOM
select PPC_DOORBELL
--
2.0.2
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH] ppc64: select HAVE_CONTEXT_TRACKING by default
2015-12-09 22:43 [PATCH] ppc64: select HAVE_CONTEXT_TRACKING by default Yang Shi
@ 2016-01-04 22:19 ` Shi, Yang
0 siblings, 0 replies; 2+ messages in thread
From: Shi, Yang @ 2016-01-04 22:19 UTC (permalink / raw)
To: benh, paulus, mpe; +Cc: linux-kernel, linuxppc-dev, linaro-kernel
Hi folks,
Any comment on this is appreciated.
Thanks,
Yang
On 12/9/2015 2:43 PM, Yang Shi wrote:
> The functionality of context tracking has been implemented by PPC64 and
> HAVE_CONTEXT_TRACKING was selected by pseries by default.
> Actually, it is applicale to all PPC64 platforms, so select it in PPC64
> generic Kconfig.
>
> NO_HZ_FULL depends on it, with this change NO_HZ_FULL could be enabled
> for all PPC64 machines.
>
> Signed-off-by: Yang Shi <yang.shi@linaro.org>
> ---
> Following the instruction in Documentation/timers/NO_HZ.txt, I tested full nohz
> on my FSL T2080 target, the below trace log shows it works well.
>
> user_loop-574 [001] d..1 137.044892: tick_stop: success=yes msg=
> user_loop-574 [001] d.h1 138.044880: hrtimer_expire_entry: hrtimer=c00000007fd22d10 function=.tick_sched_timer now=137796002092
> user_loop-574 [001] d.h1 139.044880: hrtimer_expire_entry: hrtimer=c00000007fd22d10 function=.tick_sched_timer now=138796002129
> user_loop-574 [001] d.h1 140.044880: hrtimer_expire_entry: hrtimer=c00000007fd22d10 function=.tick_sched_timer now=139796002219
> user_loop-574 [001] d.h1 141.044880: hrtimer_expire_entry: hrtimer=c00000007fd22d10 function=.tick_sched_timer now=140796002229
> user_loop-574 [001] d.h1 142.044879: hrtimer_expire_entry: hrtimer=c00000007fd22d10 function=.tick_sched_timer now=141796002159
> user_loop-574 [001] d.h1 143.044879: hrtimer_expire_entry: hrtimer=c00000007fd22d10 function=.tick_sched_timer now=142796002142
> user_loop-574 [001] d.h1 144.044878: hrtimer_expire_entry: hrtimer=c00000007fd22d10 function=.tick_sched_timer now=143796002046
> user_loop-574 [001] d.h1 145.044878: hrtimer_expire_entry: hrtimer=c00000007fd22d10 function=.tick_sched_timer now=144796002189
> user_loop-574 [001] d.h1 146.044878: hrtimer_expire_entry: hrtimer=c00000007fd22d10 function=.tick_sched_timer now=145796002199
> user_loop-574 [001] d.h1 147.044880: hrtimer_expire_entry: hrtimer=c00000007fd22d10 function=.tick_sched_timer now=146796003836
>
> It shows the timer tick just comes in every second.
>
> It should be low risk to have problem on other PPC64 targets, although they are
> not tested.
>
> arch/powerpc/platforms/Kconfig.cputype | 1 +
> arch/powerpc/platforms/pseries/Kconfig | 1 -
> 2 files changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/arch/powerpc/platforms/Kconfig.cputype b/arch/powerpc/platforms/Kconfig.cputype
> index 142dff5..7b25dd1 100644
> --- a/arch/powerpc/platforms/Kconfig.cputype
> +++ b/arch/powerpc/platforms/Kconfig.cputype
> @@ -3,6 +3,7 @@ config PPC64
> default n
> select HAVE_VIRT_CPU_ACCOUNTING
> select ZLIB_DEFLATE
> + select HAVE_CONTEXT_TRACKING
> help
> This option selects whether a 32-bit or a 64-bit kernel
> will be built.
> diff --git a/arch/powerpc/platforms/pseries/Kconfig b/arch/powerpc/platforms/pseries/Kconfig
> index bec90fb..6853148 100644
> --- a/arch/powerpc/platforms/pseries/Kconfig
> +++ b/arch/powerpc/platforms/pseries/Kconfig
> @@ -17,7 +17,6 @@ config PPC_PSERIES
> select PPC_UDBG_16550
> select PPC_NATIVE
> select PPC_DOORBELL
> - select HAVE_CONTEXT_TRACKING
> select HOTPLUG_CPU if SMP
> select ARCH_RANDOM
> select PPC_DOORBELL
>
^ permalink raw reply [flat|nested] 2+ messages in thread
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