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Merge branch 'timers/core' of git://git.kernel.org/pub/scm/linux/kernel/git/frederic/linux-dynticks into timers/core

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Merge updated full dynticks support from Frederic Weisbecker:

   - support 32-bit systems (full dynticks was 64-bit only before)
   - support ARM

Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Ingo Molnar 2013-10-03 07:53:25 +02:00
commit 19f29887a7
4 changed files with 16 additions and 2 deletions
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12
arch/Kconfig
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@ -353,6 +353,18 @@ config HAVE_CONTEXT_TRACKING
config HAVE_VIRT_CPU_ACCOUNTING config HAVE_VIRT_CPU_ACCOUNTING
bool bool
config HAVE_VIRT_CPU_ACCOUNTING_GEN
bool
default y if 64BIT
help
With VIRT_CPU_ACCOUNTING_GEN, cputime_t becomes 64-bit.
Before enabling this option, arch code must be audited
to ensure there are no races in concurrent read/write of
cputime_t. For example, reading/writing 64-bit cputime_t on
some 32-bit arches may require multiple accesses, so proper
locking is needed to protect against concurrent accesses.
config HAVE_IRQ_TIME_ACCOUNTING config HAVE_IRQ_TIME_ACCOUNTING
bool bool
help help

1
arch/arm/Kconfig
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@ -54,6 +54,7 @@ config ARM
select HAVE_REGS_AND_STACK_ACCESS_API select HAVE_REGS_AND_STACK_ACCESS_API
select HAVE_SYSCALL_TRACEPOINTS select HAVE_SYSCALL_TRACEPOINTS
select HAVE_UID16 select HAVE_UID16
select HAVE_VIRT_CPU_ACCOUNTING_GEN
select IRQ_FORCED_THREADING select IRQ_FORCED_THREADING
select KTIME_SCALAR select KTIME_SCALAR
select MODULES_USE_ELF_REL select MODULES_USE_ELF_REL

3
init/Kconfig
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@ -354,7 +354,8 @@ config VIRT_CPU_ACCOUNTING_NATIVE
config VIRT_CPU_ACCOUNTING_GEN config VIRT_CPU_ACCOUNTING_GEN
bool "Full dynticks CPU time accounting" bool "Full dynticks CPU time accounting"
depends on HAVE_CONTEXT_TRACKING && 64BIT depends on HAVE_CONTEXT_TRACKING
depends on HAVE_VIRT_CPU_ACCOUNTING_GEN
select VIRT_CPU_ACCOUNTING select VIRT_CPU_ACCOUNTING
select CONTEXT_TRACKING select CONTEXT_TRACKING
help help

2
kernel/time/Kconfig
View File

@ -100,7 +100,7 @@ config NO_HZ_FULL
# RCU_USER_QS dependency # RCU_USER_QS dependency
depends on HAVE_CONTEXT_TRACKING depends on HAVE_CONTEXT_TRACKING
# VIRT_CPU_ACCOUNTING_GEN dependency # VIRT_CPU_ACCOUNTING_GEN dependency
depends on 64BIT depends on HAVE_VIRT_CPU_ACCOUNTING_GEN
select NO_HZ_COMMON select NO_HZ_COMMON
select RCU_USER_QS select RCU_USER_QS
select RCU_NOCB_CPU select RCU_NOCB_CPU