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Commit 32ef4384 authored by Dave Hansen's avatar Dave Hansen Committed by Linus Torvalds
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teach /proc/$pid/numa_maps about transparent hugepages 



This is modeled after the smaps code.

It detects transparent hugepages and then does a single gather_stats()
for the page as a whole.  This has two benifits:
 1. It is more efficient since it does many pages in a single shot.
 2. It does not have to break down the huge page.

Signed-off-by: default avatarDave Hansen <dave@linux.vnet.ibm.com>
Acked-by: default avatarHugh Dickins <hughd@google.com>
Acked-by: default avatarDavid Rientjes <rientjes@google.com>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 3200a8aa

fs/proc/task_mmu.c

+20 −0
Original line number Original line Diff line number Diff line
@@ -936,6 +936,26 @@ static int gather_pte_stats(pmd_t *pmd, unsigned long addr, 
	pte_t *pte;

	pte_t *pte;





	md = walk->private;

	md = walk->private;

	spin_lock(&walk->mm->page_table_lock);

	if (pmd_trans_huge(*pmd)) {

		if (pmd_trans_splitting(*pmd)) {

			spin_unlock(&walk->mm->page_table_lock);

			wait_split_huge_page(md->vma->anon_vma, pmd);

		} else {

			pte_t huge_pte = *(pte_t *)pmd;

			struct page *page;



			page = can_gather_numa_stats(huge_pte, md->vma, addr);

			if (page)

				gather_stats(page, md, pte_dirty(huge_pte),

						HPAGE_PMD_SIZE/PAGE_SIZE);

			spin_unlock(&walk->mm->page_table_lock);

			return 0;

		}

	} else {

		spin_unlock(&walk->mm->page_table_lock);

	}



	orig_pte = pte = pte_offset_map_lock(walk->mm, pmd, addr, &ptl);

	orig_pte = pte = pte_offset_map_lock(walk->mm, pmd, addr, &ptl);

	do {

	do {

		struct page *page = can_gather_numa_stats(*pte, md->vma, addr);

		struct page *page = can_gather_numa_stats(*pte, md->vma, addr);