• Hugh Dickins's avatar
    ksm: more on default values · c73602ad
    Hugh Dickins authored
    Adjust the max_kernel_pages default to a quarter of totalram_pages,
    instead of nr_free_buffer_pages() / 4: the KSM pages themselves come from
    highmem, and even on a 16GB PAE machine, 4GB of KSM pages would only be
    pinning 32MB of lowmem with their rmap_items, so no need for the more
    obscure calculation (nor for its own special init function).
    
    There is no way for the user to switch KSM on if CONFIG_SYSFS is not
    enabled, so in that case default run to KSM_RUN_MERGE.
    
    Update KSM Documentation and Kconfig to reflect the new defaults.
    Signed-off-by: default avatarHugh Dickins <hugh.dickins@tiscali.co.uk>
    Cc: Izik Eidus <ieidus@redhat.com>
    Cc: Andrea Arcangeli <aarcange@redhat.com>
    Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
    Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
    c73602ad
ksm.txt 4.85 KB