diff options
Diffstat (limited to 'Documentation/features/sched')
| -rw-r--r-- | Documentation/features/sched/membarrier-sync-core/arch-support.txt | 56 | ||||
| -rw-r--r-- | Documentation/features/sched/numa-balancing/arch-support.txt | 33 |
2 files changed, 89 insertions, 0 deletions
diff --git a/Documentation/features/sched/membarrier-sync-core/arch-support.txt b/Documentation/features/sched/membarrier-sync-core/arch-support.txt new file mode 100644 index 000000000..47e6903f4 --- /dev/null +++ b/Documentation/features/sched/membarrier-sync-core/arch-support.txt @@ -0,0 +1,56 @@ +# +# Feature name: membarrier-sync-core +# Kconfig: ARCH_HAS_MEMBARRIER_SYNC_CORE +# description: arch supports core serializing membarrier +# +# Architecture requirements +# +# * arm/arm64/powerpc +# +# Rely on implicit context synchronization as a result of exception return +# when returning from IPI handler, and when returning to user-space. +# +# * x86 +# +# x86-32 uses IRET as return from interrupt, which takes care of the IPI. +# However, it uses both IRET and SYSEXIT to go back to user-space. The IRET +# instruction is core serializing, but not SYSEXIT. +# +# x86-64 uses IRET as return from interrupt, which takes care of the IPI. +# However, it can return to user-space through either SYSRETL (compat code), +# SYSRETQ, or IRET. +# +# Given that neither SYSRET{L,Q}, nor SYSEXIT, are core serializing, we rely +# instead on write_cr3() performed by switch_mm() to provide core serialization +# after changing the current mm, and deal with the special case of kthread -> +# uthread (temporarily keeping current mm into active_mm) by issuing a +# sync_core_before_usermode() in that specific case. +# + ----------------------- + | arch |status| + ----------------------- + | alpha: | TODO | + | arc: | TODO | + | arm: | ok | + | arm64: | ok | + | c6x: | TODO | + | csky: | TODO | + | h8300: | TODO | + | hexagon: | TODO | + | ia64: | TODO | + | m68k: | TODO | + | microblaze: | TODO | + | mips: | TODO | + | nds32: | TODO | + | nios2: | TODO | + | openrisc: | TODO | + | parisc: | TODO | + | powerpc: | ok | + | riscv: | TODO | + | s390: | TODO | + | sh: | TODO | + | sparc: | TODO | + | um: | TODO | + | x86: | ok | + | xtensa: | TODO | + ----------------------- diff --git a/Documentation/features/sched/numa-balancing/arch-support.txt b/Documentation/features/sched/numa-balancing/arch-support.txt new file mode 100644 index 000000000..964457ad2 --- /dev/null +++ b/Documentation/features/sched/numa-balancing/arch-support.txt @@ -0,0 +1,33 @@ +# +# Feature name: numa-balancing +# Kconfig: ARCH_SUPPORTS_NUMA_BALANCING +# description: arch supports NUMA balancing +# + ----------------------- + | arch |status| + ----------------------- + | alpha: | TODO | + | arc: | .. | + | arm: | .. | + | arm64: | ok | + | c6x: | .. | + | csky: | .. | + | h8300: | .. | + | hexagon: | .. | + | ia64: | TODO | + | m68k: | .. | + | microblaze: | .. | + | mips: | TODO | + | nds32: | TODO | + | nios2: | .. | + | openrisc: | .. | + | parisc: | .. | + | powerpc: | ok | + | riscv: | TODO | + | s390: | ok | + | sh: | .. | + | sparc: | TODO | + | um: | .. | + | x86: | ok | + | xtensa: | .. | + ----------------------- |