diff options
| -rw-r--r-- | arch/x86/Kconfig.debug | 29 |
1 files changed, 14 insertions, 15 deletions
diff --git a/arch/x86/Kconfig.debug b/arch/x86/Kconfig.debug index d872a7522e55..340399f69954 100644 --- a/arch/x86/Kconfig.debug +++ b/arch/x86/Kconfig.debug @@ -73,20 +73,19 @@ config DEBUG_TLBFLUSH bool "Set upper limit of TLB entries to flush one-by-one" depends on DEBUG_KERNEL help + X86-only for now. - X86-only for now. + This option allows the user to tune the amount of TLB entries the + kernel flushes one-by-one instead of doing a full TLB flush. In + certain situations, the former is cheaper. This is controlled by the + tlb_flushall_shift knob under /sys/kernel/debug/x86. If you set it + to -1, the code flushes the whole TLB unconditionally. Otherwise, + for positive values of it, the kernel will use single TLB entry + invalidating instructions according to the following formula: - This option allows the user to tune the amount of TLB entries the - kernel flushes one-by-one instead of doing a full TLB flush. In - certain situations, the former is cheaper. This is controlled by the - tlb_flushall_shift knob under /sys/kernel/debug/x86. If you set it - to -1, the code flushes the whole TLB unconditionally. Otherwise, - for positive values of it, the kernel will use single TLB entry - invalidating instructions according to the following formula: + flush_entries <= active_tlb_entries / 2^tlb_flushall_shift - flush_entries <= active_tlb_entries / 2^tlb_flushall_shift - - If in doubt, say "N". + If in doubt, say "N". config IOMMU_DEBUG bool "Enable IOMMU debugging" @@ -119,10 +118,10 @@ config X86_DECODER_SELFTEST depends on DEBUG_KERNEL && INSTRUCTION_DECODER depends on !COMPILE_TEST help - Perform x86 instruction decoder selftests at build time. - This option is useful for checking the sanity of x86 instruction - decoder code. - If unsure, say "N". + Perform x86 instruction decoder selftests at build time. + This option is useful for checking the sanity of x86 instruction + decoder code. + If unsure, say "N". choice prompt "IO delay type" |