rcu: move Kconfig menu
Move RCU Kconfig options from top-level menu to an "RCU Subsystem" menu under the "General Setup" menu. Signed-off-by: Mike Travis <travis@sgi.com> Tested-by: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Mike Travis
Ingo Molnar
Родитель
baf48f6577
Коммит
c903ff8379
179
init/Kconfig
179
init/Kconfig
|
|
@ -238,6 +238,98 @@ config AUDIT_TREE
|
|||
def_bool y
|
||||
depends on AUDITSYSCALL && INOTIFY
|
||||
|
||||
menu "RCU Subsystem"
|
||||
|
||||
choice
|
||||
prompt "RCU Implementation"
|
||||
default CLASSIC_RCU
|
||||
|
||||
config CLASSIC_RCU
|
||||
bool "Classic RCU"
|
||||
help
|
||||
This option selects the classic RCU implementation that is
|
||||
designed for best read-side performance on non-realtime
|
||||
systems.
|
||||
|
||||
Select this option if you are unsure.
|
||||
|
||||
config TREE_RCU
|
||||
bool "Tree-based hierarchical RCU"
|
||||
help
|
||||
This option selects the RCU implementation that is
|
||||
designed for very large SMP system with hundreds or
|
||||
thousands of CPUs.
|
||||
|
||||
config PREEMPT_RCU
|
||||
bool "Preemptible RCU"
|
||||
depends on PREEMPT
|
||||
help
|
||||
This option reduces the latency of the kernel by making certain
|
||||
RCU sections preemptible. Normally RCU code is non-preemptible, if
|
||||
this option is selected then read-only RCU sections become
|
||||
preemptible. This helps latency, but may expose bugs due to
|
||||
now-naive assumptions about each RCU read-side critical section
|
||||
remaining on a given CPU through its execution.
|
||||
|
||||
endchoice
|
||||
|
||||
config RCU_TRACE
|
||||
bool "Enable tracing for RCU"
|
||||
depends on TREE_RCU || PREEMPT_RCU
|
||||
help
|
||||
This option provides tracing in RCU which presents stats
|
||||
in debugfs for debugging RCU implementation.
|
||||
|
||||
Say Y here if you want to enable RCU tracing
|
||||
Say N if you are unsure.
|
||||
|
||||
config RCU_FANOUT
|
||||
int "Tree-based hierarchical RCU fanout value"
|
||||
range 2 64 if 64BIT
|
||||
range 2 32 if !64BIT
|
||||
depends on TREE_RCU
|
||||
default 64 if 64BIT
|
||||
default 32 if !64BIT
|
||||
help
|
||||
This option controls the fanout of hierarchical implementations
|
||||
of RCU, allowing RCU to work efficiently on machines with
|
||||
large numbers of CPUs. This value must be at least the cube
|
||||
root of NR_CPUS, which allows NR_CPUS up to 32,768 for 32-bit
|
||||
systems and up to 262,144 for 64-bit systems.
|
||||
|
||||
Select a specific number if testing RCU itself.
|
||||
Take the default if unsure.
|
||||
|
||||
config RCU_FANOUT_EXACT
|
||||
bool "Disable tree-based hierarchical RCU auto-balancing"
|
||||
depends on TREE_RCU
|
||||
default n
|
||||
help
|
||||
This option forces use of the exact RCU_FANOUT value specified,
|
||||
regardless of imbalances in the hierarchy. This is useful for
|
||||
testing RCU itself, and might one day be useful on systems with
|
||||
strong NUMA behavior.
|
||||
|
||||
Without RCU_FANOUT_EXACT, the code will balance the hierarchy.
|
||||
|
||||
Say N if unsure.
|
||||
|
||||
config TREE_RCU_TRACE
|
||||
def_bool RCU_TRACE && TREE_RCU
|
||||
select DEBUG_FS
|
||||
help
|
||||
This option provides tracing for the TREE_RCU implementation,
|
||||
permitting Makefile to trivially select kernel/rcutree_trace.c.
|
||||
|
||||
config PREEMPT_RCU_TRACE
|
||||
def_bool RCU_TRACE && PREEMPT_RCU
|
||||
select DEBUG_FS
|
||||
help
|
||||
This option provides tracing for the PREEMPT_RCU implementation,
|
||||
permitting Makefile to trivially select kernel/rcupreempt_trace.c.
|
||||
|
||||
endmenu # "RCU Subsystem"
|
||||
|
||||
config IKCONFIG
|
||||
tristate "Kernel .config support"
|
||||
---help---
|
||||
|
|
@ -973,90 +1065,3 @@ source "block/Kconfig"
|
|||
config PREEMPT_NOTIFIERS
|
||||
bool
|
||||
|
||||
choice
|
||||
prompt "RCU Implementation"
|
||||
default CLASSIC_RCU
|
||||
|
||||
config CLASSIC_RCU
|
||||
bool "Classic RCU"
|
||||
help
|
||||
This option selects the classic RCU implementation that is
|
||||
designed for best read-side performance on non-realtime
|
||||
systems.
|
||||
|
||||
Select this option if you are unsure.
|
||||
|
||||
config TREE_RCU
|
||||
bool "Tree-based hierarchical RCU"
|
||||
help
|
||||
This option selects the RCU implementation that is
|
||||
designed for very large SMP system with hundreds or
|
||||
thousands of CPUs.
|
||||
|
||||
config PREEMPT_RCU
|
||||
bool "Preemptible RCU"
|
||||
depends on PREEMPT
|
||||
help
|
||||
This option reduces the latency of the kernel by making certain
|
||||
RCU sections preemptible. Normally RCU code is non-preemptible, if
|
||||
this option is selected then read-only RCU sections become
|
||||
preemptible. This helps latency, but may expose bugs due to
|
||||
now-naive assumptions about each RCU read-side critical section
|
||||
remaining on a given CPU through its execution.
|
||||
|
||||
endchoice
|
||||
|
||||
config RCU_TRACE
|
||||
bool "Enable tracing for RCU"
|
||||
depends on TREE_RCU || PREEMPT_RCU
|
||||
help
|
||||
This option provides tracing in RCU which presents stats
|
||||
in debugfs for debugging RCU implementation.
|
||||
|
||||
Say Y here if you want to enable RCU tracing
|
||||
Say N if you are unsure.
|
||||
|
||||
config RCU_FANOUT
|
||||
int "Tree-based hierarchical RCU fanout value"
|
||||
range 2 64 if 64BIT
|
||||
range 2 32 if !64BIT
|
||||
depends on TREE_RCU
|
||||
default 64 if 64BIT
|
||||
default 32 if !64BIT
|
||||
help
|
||||
This option controls the fanout of hierarchical implementations
|
||||
of RCU, allowing RCU to work efficiently on machines with
|
||||
large numbers of CPUs. This value must be at least the cube
|
||||
root of NR_CPUS, which allows NR_CPUS up to 32,768 for 32-bit
|
||||
systems and up to 262,144 for 64-bit systems.
|
||||
|
||||
Select a specific number if testing RCU itself.
|
||||
Take the default if unsure.
|
||||
|
||||
config RCU_FANOUT_EXACT
|
||||
bool "Disable tree-based hierarchical RCU auto-balancing"
|
||||
depends on TREE_RCU
|
||||
default n
|
||||
help
|
||||
This option forces use of the exact RCU_FANOUT value specified,
|
||||
regardless of imbalances in the hierarchy. This is useful for
|
||||
testing RCU itself, and might one day be useful on systems with
|
||||
strong NUMA behavior.
|
||||
|
||||
Without RCU_FANOUT_EXACT, the code will balance the hierarchy.
|
||||
|
||||
Say N if unsure.
|
||||
|
||||
config TREE_RCU_TRACE
|
||||
def_bool RCU_TRACE && TREE_RCU
|
||||
select DEBUG_FS
|
||||
help
|
||||
This option provides tracing for the TREE_RCU implementation,
|
||||
permitting Makefile to trivially select kernel/rcutree_trace.c.
|
||||
|
||||
config PREEMPT_RCU_TRACE
|
||||
def_bool RCU_TRACE && PREEMPT_RCU
|
||||
select DEBUG_FS
|
||||
help
|
||||
This option provides tracing for the PREEMPT_RCU implementation,
|
||||
permitting Makefile to trivially select kernel/rcupreempt_trace.c.
|
||||
|
|
|
|||
Загрузка…
Ссылка в новой задаче