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| author | Dave Hansen <dave@linux.vnet.ibm.com> | 2011-03-22 16:33:00 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2011-03-22 17:44:04 -0700 |
| commit | 22e057c5923e60debad318cbeaee33033b110bc8 (patch) | |
| tree | 7dd6d7b5ed93974263377cd458384b85b2847041 /fs | |
| parent | 3c9acc7849b1eab7ffc75e933404c5f32865d9a2 (diff) | |
| download | lwn-22e057c5923e60debad318cbeaee33033b110bc8.tar.gz lwn-22e057c5923e60debad318cbeaee33033b110bc8.zip | |
smaps: teach smaps_pte_range() about THP pmds
This adds code to explicitly detect and handle pmd_trans_huge() pmds. It
then passes HPAGE_SIZE units in to the smap_pte_entry() function instead
of PAGE_SIZE.
This means that using /proc/$pid/smaps now will no longer cause THPs to be
broken down in to small pages.
Signed-off-by: Dave Hansen <dave@linux.vnet.ibm.com>
Reviewed-by: Eric B Munson <emunson@mgebm.net>
Tested-by: Eric B Munson <emunson@mgebm.net>
Acked-by: Andrea Arcangeli <aarcange@redhat.com>
Acked-by: David Rientjes <rientjes@google.com>
Cc: Mel Gorman <mel@csn.ul.ie>
Cc: Michael J Wolf <mjwolf@us.ibm.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Matt Mackall <mpm@selenic.com>
Cc: Jeremy Fitzhardinge <jeremy@goop.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/proc/task_mmu.c | 23 |
1 files changed, 21 insertions, 2 deletions
diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c index d7e2af334076..26f9cc00102c 100644 --- a/fs/proc/task_mmu.c +++ b/fs/proc/task_mmu.c @@ -1,5 +1,6 @@ #include <linux/mm.h> #include <linux/hugetlb.h> +#include <linux/huge_mm.h> #include <linux/mount.h> #include <linux/seq_file.h> #include <linux/highmem.h> @@ -7,6 +8,7 @@ #include <linux/slab.h> #include <linux/pagemap.h> #include <linux/mempolicy.h> +#include <linux/rmap.h> #include <linux/swap.h> #include <linux/swapops.h> @@ -385,8 +387,25 @@ static int smaps_pte_range(pmd_t *pmd, unsigned long addr, unsigned long end, pte_t *pte; spinlock_t *ptl; - split_huge_page_pmd(walk->mm, pmd); - + 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(vma->anon_vma, pmd); + } else { + smaps_pte_entry(*(pte_t *)pmd, addr, + HPAGE_PMD_SIZE, walk); + spin_unlock(&walk->mm->page_table_lock); + return 0; + } + } else { + spin_unlock(&walk->mm->page_table_lock); + } + /* + * The mmap_sem held all the way back in m_start() is what + * keeps khugepaged out of here and from collapsing things + * in here. + */ pte = pte_offset_map_lock(vma->vm_mm, pmd, addr, &ptl); for (; addr != end; pte++, addr += PAGE_SIZE) smaps_pte_entry(*pte, addr, PAGE_SIZE, walk); |