From c5cee6421cd651446b93c231f0ab8ff2530ba25d Mon Sep 17 00:00:00 2001 From: Balbir Singh Date: Thu, 25 May 2017 17:28:32 +1000 Subject: [PATCH] powerpc/mm/hash: Do a local flush if possible when no batch is active Currently in hpte_need_flush() if there is no batch pending we always do a global TLB flush, which is inefficient if the mm has never run on another thread. Instead do the same check that __flush_tlb_pending() does and check if a local flush is sufficient when batch->active is false. Instead of open-coding it we use mm_is_thread_local(). Signed-off-by: Balbir Singh [mpe: Don't use a local, just inline mm_is_thread_local()] Signed-off-by: Michael Ellerman --- arch/powerpc/mm/tlb_hash64.c | 6 ++---- 1 file changed, 2 insertions(+), 4 deletions(-) diff --git a/arch/powerpc/mm/tlb_hash64.c b/arch/powerpc/mm/tlb_hash64.c index 4517aa43a8b1..b5b0fb97b9c0 100644 --- a/arch/powerpc/mm/tlb_hash64.c +++ b/arch/powerpc/mm/tlb_hash64.c @@ -93,12 +93,10 @@ void hpte_need_flush(struct mm_struct *mm, unsigned long addr, /* * Check if we have an active batch on this CPU. If not, just - * flush now and return. For now, we don global invalidates - * in that case, might be worth testing the mm cpu mask though - * and decide to use local invalidates instead... + * flush now and return. */ if (!batch->active) { - flush_hash_page(vpn, rpte, psize, ssize, 0); + flush_hash_page(vpn, rpte, psize, ssize, mm_is_thread_local(mm)); put_cpu_var(ppc64_tlb_batch); return; } -- 2.20.1