• Mike Kravetz's avatar
    mm/hugetlb: optimize minimum size (min_size) accounting · 09a95e29
    Mike Kravetz authored
    It was observed that minimum size accounting associated with the
    hugetlbfs min_size mount option may not perform optimally and as
    expected.  As huge pages/reservations are released from the filesystem
    and given back to the global pools, they are reserved for subsequent
    filesystem use as long as the subpool reserved count is less than
    subpool minimum size.  It does not take into account used pages within
    the filesystem.  The filesystem size limits are not exceeded and this is
    technically not a bug.  However, better behavior would be to wait for
    the number of used pages/reservations associated with the filesystem to
    drop below the minimum size before taking reservations to satisfy
    minimum size.
    
    An optimization is also made to the hugepage_subpool_get_pages() routine
    which is called when pages/reservations are allocated.  This does not
    change behavior, but simply avoids the accounting if all reservations
    have already been taken (subpool reserved count == 0).
    Signed-off-by: default avatarMike Kravetz <mike.kravetz@oracle.com>
    Acked-by: default avatarNaoya Horiguchi <n-horiguchi@ah.jp.nec.com>
    Cc: Hillf Danton <hillf.zj@alibaba-inc.com>
    Cc: David Rientjes <rientjes@google.com>
    Cc: Dave Hansen <dave.hansen@linux.intel.com>
    Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
    Cc: Paul Gortmaker <paul.gortmaker@windriver.com>
    Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
    Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
    09a95e29
hugetlb.c 118 KB