From 32ef43848f283e0ef945d3c67e851c143fea3970 Mon Sep 17 00:00:00 2001 From: Dave Hansen Date: Tue, 20 Sep 2011 15:19:41 -0700 Subject: [PATCH] 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: Dave Hansen Acked-by: Hugh Dickins Acked-by: David Rientjes Signed-off-by: Linus Torvalds --- fs/proc/task_mmu.c | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c index 9dca07e0758..5afaa58a863 100644 --- a/fs/proc/task_mmu.c +++ b/fs/proc/task_mmu.c @@ -936,6 +936,26 @@ static int gather_pte_stats(pmd_t *pmd, unsigned long addr, pte_t *pte; 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); do { struct page *page = can_gather_numa_stats(*pte, md->vma, addr); -- 2.20.1