MADV_HUGEPAGE is a new addition to readahead with behavior distinct from normal pages. To prevent confusion, we should update the documentation accordingly. Signed-off-by: Yafang Shao <laoar.shao@xxxxxxxxx> Cc: David Hildenbrand <david@xxxxxxxxxx> Cc: Matthew Wilcox <willy@xxxxxxxxxxxxx> --- Documentation/ABI/stable/sysfs-block | 3 +++ 1 file changed, 3 insertions(+) diff --git a/Documentation/ABI/stable/sysfs-block b/Documentation/ABI/stable/sysfs-block index cea8856f798d..7a820a7d53aa 100644 --- a/Documentation/ABI/stable/sysfs-block +++ b/Documentation/ABI/stable/sysfs-block @@ -594,6 +594,9 @@ Description: [RW] Maximum number of kilobytes to read-ahead for filesystems on this block device. + For MADV_HUGEPAGE, the readahead size may exceed this setting + since its granularity is based on the hugepage size. + What: /sys/block/<disk>/queue/rotational Date: January 2009 -- 2.43.5
