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authorNaoya Horiguchi <n-horiguchi@ah.jp.nec.com>2013-11-12 15:07:50 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2013-11-13 12:09:07 +0900
commit46c77e2bb07eba3b38edfec76873f12942c49dd3 (patch)
tree2e6dd491627079f3e377e948f23137dd0c4cab40 /mm/zswap.c
parentec8e41aec13005fed0dbee002fb8c99b4e001d50 (diff)
tools/vm/page-types.c: support KPF_SOFTDIRTY bit
Soft dirty bit allows us to track which pages are written since the last clear_ref (by "echo 4 > /proc/pid/clear_refs".) This is useful for userspace applications to know their memory footprints. Note that the kernel exposes this flag via bit[55] of /proc/pid/pagemap, and the semantics is not a default one (scheduled to be the default in the near future.) However, it shifts to the new semantics at the first clear_ref, and the users of soft dirty bit always do it before utilizing the bit, so that's not a big deal. Users must avoid relying on the bit in page-types before the first clear_ref. Signed-off-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com> Cc: Wu Fengguang <fengguang.wu@intel.com> Cc: Pavel Emelyanov <xemul@parallels.com> Cc: Cyrill Gorcunov <gorcunov@openvz.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/zswap.c')
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