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Idle page tracking can also be used for process address space, not only file mappings. Without this change, using with '-i' option for process address space encounters below errors reported. $ sudo ./page-types -p $(pidof bash) -i mark page idle: Bad file descriptor mark page idle: Bad file descriptor mark page idle: Bad file descriptor mark page idle: Bad file descriptor ... Link: https://lkml.kernel.org/r/[email protected] Signed-off-by: Changbin Du <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>