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authorNaoya Horiguchi <n-horiguchi@ah.jp.nec.com>2012-03-21 16:33:57 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2012-03-21 17:54:56 -0700
commit5aaabe831eb527e0d9284f0745d830a755f70393 (patch)
tree2efdfe775da1c727c60ef5bd2d865d2150f68381 /fs/dcache.c
parentb716ad953a2bc4a543143c1d9836b7007a4b182f (diff)
downloadlinux-5aaabe831eb527e0d9284f0745d830a755f70393.tar.bz2
pagemap: avoid splitting thp when reading /proc/pid/pagemap
Thp split is not necessary if we explicitly check whether pmds are mapping thps or not. This patch introduces this check and adds code to generate pagemap entries for pmds mapping thps, which results in less performance impact of pagemap on thp. Signed-off-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com> Reviewed-by: Andi Kleen <ak@linux.intel.com> Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: David Rientjes <rientjes@google.com> Cc: Wu Fengguang <fengguang.wu@intel.com> Cc: Andrea Arcangeli <aarcange@redhat.com> Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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