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| author | Dave Hansen <dave@linux.vnet.ibm.com> | 2011-09-20 15:19:41 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2011-10-03 11:40:38 -0700 |
| commit | e2d598ab82b589fc40c4656a10004e328a90b6dd (patch) | |
| tree | e6c40037e63411716b41b07c962cdd2c8b11d621 | |
| parent | b879781180172696903fac604ba44c3204e0c1e4 (diff) | |
| download | lwn-e2d598ab82b589fc40c4656a10004e328a90b6dd.tar.gz lwn-e2d598ab82b589fc40c4656a10004e328a90b6dd.zip | |
teach /proc/$pid/numa_maps about transparent hugepages
commit 32ef43848f283e0ef945d3c67e851c143fea3970 upstream.
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 <dave@linux.vnet.ibm.com>
Acked-by: Hugh Dickins <hughd@google.com>
Acked-by: David Rientjes <rientjes@google.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
| -rw-r--r-- | fs/proc/task_mmu.c | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c index 9dca07e0758d..5afaa58a8630 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); |