Hillf Danton <hillf.zj@xxxxxxxxxxxxxxx> writes:
>> diff --git a/mm/memory.c b/mm/memory.c
>> index 15322b73636b..a01db5bc756b 100644
>> --- a/mm/memory.c
>> +++ b/mm/memory.c
>> @@ -292,23 +292,24 @@ void tlb_finish_mmu(struct mmu_gather *tlb, unsigned long start, unsigned long e
>> * handling the additional races in SMP caused by other CPUs caching valid
>> * mappings in their TLBs. Returns the number of free page slots left.
>> * When out of page slots we must call tlb_flush_mmu().
>> + *returns true if the caller should flush.
>> */
>> -int __tlb_remove_page(struct mmu_gather *tlb, struct page *page)
>> +bool __tlb_remove_page(struct mmu_gather *tlb, struct page *page)
>> {
>> struct mmu_gather_batch *batch;
>>
>> VM_BUG_ON(!tlb->end);
>>
>> batch = tlb->active;
>> - batch->pages[batch->nr++] = page;
>> if (batch->nr == batch->max) {
>> if (!tlb_next_batch(tlb))
>> - return 0;
>> + return true;
>> batch = tlb->active;
>> }
>> VM_BUG_ON_PAGE(batch->nr > batch->max, page);
>
> Still needed?
yes, we need to make sure the batch we picked doesn't have a wrong
batch->nr value.
>>
>> - return batch->max - batch->nr;
>> + batch->pages[batch->nr++] = page;
>> + return false;
>> }
>>
>> #endif /* HAVE_GENERIC_MMU_GATHER */
>> @@ -1109,6 +1110,7 @@ static unsigned long zap_pte_range(struct mmu_gather *tlb,
>> pte_t *start_pte;
>> pte_t *pte;
>> swp_entry_t entry;
>> + struct page *pending_page = NULL;
>>
>> again:
>> init_rss_vec(rss);
>> @@ -1160,8 +1162,9 @@ again:
>> page_remove_rmap(page, false);
>> if (unlikely(page_mapcount(page) < 0))
>> print_bad_pte(vma, addr, ptent, page);
>> - if (unlikely(!__tlb_remove_page(tlb, page))) {
>> + if (unlikely(__tlb_remove_page(tlb, page))) {
>> force_flush = 1;
>> + pending_page = page;
>> addr += PAGE_SIZE;
>> break;
>> }
>> @@ -1202,7 +1205,12 @@ again:
>> if (force_flush) {
>> force_flush = 0;
>> tlb_flush_mmu_free(tlb);
>> -
>> + if (pending_page) {
>> + /* remove the page with new size */
>> + __tlb_adjust_range(tlb, tlb->addr);
>
> Would you please specify why tlb->addr is used here?
>
That is needed because tlb_flush_mmu_tlbonly() does a __tlb_reset_range().
>> + __tlb_remove_page(tlb, pending_page);
>> + pending_page = NULL;
>> + }
>> if (addr != end)
>> goto again;
>> }
>> --
>> 2.7.4
-aneesh
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