mirror of
https://github.com/torvalds/linux.git
synced 2026-10-07 22:37:45 -04:00
Pasha Tatashin
6189eb82f0
There is 8 byte page_ext->flags field allocated per page whenever CONFIG_PAGE_EXTENSION is enabled. However, not every user of page_ext uses flags. Therefore, check whether flags is needed at least by one user and if so allocate space for it. For example when page_table_check is enabled, on a machine with 128G of memory before the fix: [ 2.244288] allocated 536870912 bytes of page_ext after the fix: [ 2.160154] allocated 268435456 bytes of page_ext Also, add a kernel-doc comment before page_ext_operations that describes the fields, and remove check if need() is set, as that is now a required field. [[email protected]: address comments from Mike Rapoport] Link: https://lkml.kernel.org/r/[email protected] Link: https://lkml.kernel.org/r/[email protected] Signed-off-by: Pasha Tatashin <[email protected]> Acked-by: David Hildenbrand <[email protected]> Acked-by: Vlastimil Babka <[email protected]> Acked-by: David Rientjes <[email protected]> Reviewed-by: Mike Rapoport (IBM) <[email protected]> Cc: Charan Teja Kalla <[email protected]> Cc: Li Zhe <[email protected]> Cc: Michal Hocko <[email protected]> Cc: Vlastimil Babka <[email protected]> Signed-off-by: Andrew Morton <[email protected]>