zram: introduce an aged idle interface

This change introduces an aged idle interface to the existing idle sysfs
file for zram.

When CONFIG_ZRAM_MEMORY_TRACKING is enabled the idle file now also
accepts an integer argument.  This integer is the age (in seconds) of
pages to mark as idle.  The idle file still supports 'all' as it always
has.  This new approach allows for much more control over which pages
get marked as idle.

[[email protected]: use IS_ENABLED and cleanup comment]
  Link: https://lkml.kernel.org/r/[email protected]
[[email protected]: Sergey's cleanup suggestions]
  Link: https://lkml.kernel.org/r/[email protected]

Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Brian Geffon <[email protected]>
Acked-by: Minchan Kim <[email protected]>
Reviewed-by: Sergey Senozhatsky <[email protected]>
Cc: Nitin Gupta <[email protected]>
Cc: Jonathan Corbet <[email protected]>
Cc: Suleiman Souhlal <[email protected]>
Cc: Jesse Barnes <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

0 files changed, 0 insertions, 0 deletions