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powerpc/mm/hash: Do a local flush if possible when no batch is active

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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 <bsingharora@gmail.com>
[mpe: Don't use a local, just inline mm_is_thread_local()]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Balbir Singh 2017-05-25 17:28:32 +10:00 committed by Michael Ellerman
parent 64d09f5ecb
commit c5cee6421c
1 changed files with 2 additions and 4 deletions
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6
arch/powerpc/mm/tlb_hash64.c
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@ -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;
}