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....@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
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