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author | Naoya Horiguchi <n-horiguchi@ah.jp.nec.com> | 2013-11-12 15:07:50 -0800 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2013-11-13 12:09:07 +0900 |
commit | 46c77e2bb07eba3b38edfec76873f12942c49dd3 (patch) | |
tree | 2e6dd491627079f3e377e948f23137dd0c4cab40 /fs/xfs/xfs_super.c | |
parent | ec8e41aec13005fed0dbee002fb8c99b4e001d50 (diff) | |
download | linux-46c77e2bb07eba3b38edfec76873f12942c49dd3.tar.bz2 |
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 'fs/xfs/xfs_super.c')
0 files changed, 0 insertions, 0 deletions