]> git.proxmox.com Git - mirror_ubuntu-kernels.git/commit
mm: /proc/pid/clear_refs: avoid split_huge_page()
authorKirill A. Shutemov <kirill.shutemov@linux.intel.com>
Wed, 11 Feb 2015 23:28:08 +0000 (15:28 -0800)
committerLinus Torvalds <torvalds@linux-foundation.org>
Thu, 12 Feb 2015 01:06:06 +0000 (17:06 -0800)
commit7d5b3bfaa2da150ce2dc45546f2125b854f962ef
tree71f1b4079d82bbac9af54c6f625afa0ecdf45215
parent48684a65b4e3ff544d62532c1b78962c9677b632
mm: /proc/pid/clear_refs: avoid split_huge_page()

Currently pagewalker splits all THP pages on any clear_refs request.  It's
not necessary.  We can handle this on PMD level.

One side effect is that soft dirty will potentially see more dirty memory,
since we will mark whole THP page dirty at once.

Sanity checked with CRIU test suite. More testing is required.

Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Signed-off-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Reviewed-by: Cyrill Gorcunov <gorcunov@openvz.org>
Cc: Pavel Emelyanov <xemul@parallels.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Dave Hansen <dave.hansen@intel.com>
Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
fs/proc/task_mmu.c