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CONFIG_DEBUG_TLBFLUSH: Set upper limit of TLB entries to flush one-by-one

General informations

The Linux kernel configuration item CONFIG_DEBUG_TLBFLUSH:

Help text

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:

flush_entries <= active_tlb_entries / 2^tlb_flushall_shift

If in doubt, say "N".

Hardware

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