On 12.02.15 15:58, Peter Maydell wrote: > On 12 February 2015 at 14:45, Alexander Graf <ag...@suse.de> wrote: >> almost nobody except x86 does global flushes > > All ARM TLB maintenance operations have both "this CPU only" > and "all TLBs in the Inner Shareable domain" [that's ARM-speak > for "every CPU core in the cluster"] variants (the latter > being the TLB *IS operations). Looking at Linux's > arch/arm64/mm/tlb.S and arch/arm64/include/asm/tlbflush.h > most of the operations defined there use the IS variants.
Wow, did anyone benchmark this? I know that PPC switched away from global flushes and instead tracks the CPUs a task was running on to limit the scope of CPUs that need to flush. Alex
