Re: [PATCH 3/4] powerpc/mm/radix: Avoid flushing the PWC on every flush_tlb_range
From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Date: 2017-07-14 06:22:55
On Fri, 2017-07-14 at 11:14 +0530, Aneesh Kumar K.V wrote:
quoted
+ pid = mm ? mm->context.id : 0; + if (unlikely(pid == MMU_NO_CONTEXT)) + goto no_context; + + /* 4k page size, just blow the world */ + if (PAGE_SIZE == 0x1000) { + radix__flush_all_mm(mm); + return; + }What is special here ? because it is 4096 tlb flushes ?
Yes, keeping in line with the existing logic in flush_tlb_pages(), more than 32, do a full flush. Cheers, Ben.