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| author | Andy Lutomirski <luto@kernel.org> | 2021-06-22 11:52:58 -0700 |
|---|---|---|
| committer | Andy Lutomirski <luto@kernel.org> | 2022-01-09 12:23:48 -0800 |
| commit | 61c1e1d11a23618095cb553e3bdb22bf43f32ac3 (patch) | |
| tree | 39e32d5d1b536c4cb956ae0f6b00e9f7848a9172 | |
| parent | db699bc56f966b7bed4a4ae93c998538495a269e (diff) | |
| download | linux-sched/lazymm.tar.gz | |
x86/mm: Opt in to IRQs-off activate_mm()sched/lazymm
We gain nothing by having the core code enable IRQs right before calling
activate_mm() only for us to turn them right back off again in switch_mm().
This will save a few cycles, so execve() should be blazingly fast with this
patch applied!
Signed-off-by: Andy Lutomirski <luto@kernel.org>
| -rw-r--r-- | arch/x86/Kconfig | 1 | ||||
| -rw-r--r-- | arch/x86/include/asm/mmu_context.h | 8 |
2 files changed, 5 insertions, 4 deletions
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index 5060c38bf5602f..908a596619f2a2 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -119,6 +119,7 @@ config X86 select ARCH_WANT_LD_ORPHAN_WARN select ARCH_WANTS_THP_SWAP if X86_64 select ARCH_HAS_PARANOID_L1D_FLUSH + select ARCH_WANT_IRQS_OFF_ACTIVATE_MM select BUILDTIME_TABLE_SORT select CLKEVT_I8253 select CLOCKSOURCE_VALIDATE_LAST_CYCLE diff --git a/arch/x86/include/asm/mmu_context.h b/arch/x86/include/asm/mmu_context.h index 2ca4fc4a8a0ae7..f028f1b68bc0fe 100644 --- a/arch/x86/include/asm/mmu_context.h +++ b/arch/x86/include/asm/mmu_context.h @@ -132,10 +132,10 @@ extern void switch_mm_irqs_off(struct mm_struct *prev, struct mm_struct *next, struct task_struct *tsk); #define switch_mm_irqs_off switch_mm_irqs_off -#define activate_mm(prev, next) \ -do { \ - paravirt_activate_mm((prev), (next)); \ - switch_mm((prev), (next), NULL); \ +#define activate_mm(prev, next) \ +do { \ + paravirt_activate_mm((prev), (next)); \ + switch_mm_irqs_off((prev), (next), NULL); \ } while (0); #ifdef CONFIG_X86_32 |