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Commit 458aa76d authored by Aneesh Kumar K.V's avatar Aneesh Kumar K.V Committed by Linus Torvalds
Browse files

mm/thp/migration: switch from flush_tlb_range to flush_pmd_tlb_range 



We remove one instace of flush_tlb_range here.  That was added by commit
f714f4f2 ("mm: numa: call MMU notifiers on THP migration").  But the
pmdp_huge_clear_flush_notify should have done the require flush for us.
Hence remove the extra flush.

Signed-off-by: default avatarAneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Cc: Mel Gorman <mgorman@techsingularity.net>
Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Cc: Vineet Gupta <Vineet.Gupta1@synopsys.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent bcf66917

include/asm-generic/pgtable.h

+17 −0
Original line number Diff line number Diff line
@@ -783,6 +783,23 @@ static inline int pmd_clear_huge(pmd_t *pmd) 
}

#endif	/* CONFIG_HAVE_ARCH_HUGE_VMAP */



#ifndef __HAVE_ARCH_FLUSH_PMD_TLB_RANGE

#ifdef CONFIG_TRANSPARENT_HUGEPAGE

/*

 * ARCHes with special requirements for evicting THP backing TLB entries can

 * implement this. Otherwise also, it can help optimize normal TLB flush in

 * THP regime. stock flush_tlb_range() typically has optimization to nuke the

 * entire TLB TLB if flush span is greater than a threshold, which will

 * likely be true for a single huge page. Thus a single thp flush will

 * invalidate the entire TLB which is not desitable.

 * e.g. see arch/arc: flush_pmd_tlb_range

 */

#define flush_pmd_tlb_range(vma, addr, end)	flush_tlb_range(vma, addr, end)

#else

#define flush_pmd_tlb_range(vma, addr, end)	BUILD_BUG()

#endif

#endif



#endif /* !__ASSEMBLY__ */



#ifndef io_remap_pfn_range

mm/migrate.c

+5 −3
Original line number Diff line number Diff line
@@ -1773,7 +1773,10 @@ int migrate_misplaced_transhuge_page(struct mm_struct *mm, 
		put_page(new_page);

		goto out_fail;

	}



	/*

	 * We are not sure a pending tlb flush here is for a huge page

	 * mapping or not. Hence use the tlb range variant

	 */

	if (mm_tlb_flush_pending(mm))

		flush_tlb_range(vma, mmun_start, mmun_end);
@@ -1829,12 +1832,11 @@ int migrate_misplaced_transhuge_page(struct mm_struct *mm, 
	page_add_anon_rmap(new_page, vma, mmun_start, true);

	pmdp_huge_clear_flush_notify(vma, mmun_start, pmd);

	set_pmd_at(mm, mmun_start, pmd, entry);

	flush_tlb_range(vma, mmun_start, mmun_end);

	update_mmu_cache_pmd(vma, address, &entry);



	if (page_count(page) != 2) {

		set_pmd_at(mm, mmun_start, pmd, orig_entry);

		flush_tlb_range(vma, mmun_start, mmun_end);

		flush_pmd_tlb_range(vma, mmun_start, mmun_end);

		mmu_notifier_invalidate_range(mm, mmun_start, mmun_end);

		update_mmu_cache_pmd(vma, address, &entry);

		page_remove_rmap(new_page, true);

mm/pgtable-generic.c

+0 −14
Original line number Diff line number Diff line
@@ -84,20 +84,6 @@ pte_t ptep_clear_flush(struct vm_area_struct *vma, unsigned long address, 


#ifdef CONFIG_TRANSPARENT_HUGEPAGE



#ifndef __HAVE_ARCH_FLUSH_PMD_TLB_RANGE



/*

 * ARCHes with special requirements for evicting THP backing TLB entries can

 * implement this. Otherwise also, it can help optimize normal TLB flush in

 * THP regime. stock flush_tlb_range() typically has optimization to nuke the

 * entire TLB if flush span is greater than a threshold, which will

 * likely be true for a single huge page. Thus a single thp flush will

 * invalidate the entire TLB which is not desirable.

 * e.g. see arch/arc: flush_pmd_tlb_range

 */

#define flush_pmd_tlb_range(vma, addr, end)	flush_tlb_range(vma, addr, end)

#endif



#ifndef __HAVE_ARCH_PMDP_SET_ACCESS_FLAGS

int pmdp_set_access_flags(struct vm_area_struct *vma,

			  unsigned long address, pmd_t *pmdp,