• KOSAKI Motohiro's avatar
    mm: convert mm->cpu_vm_cpumask into cpumask_var_t · de03c72c
    KOSAKI Motohiro authored
    cpumask_t is very big struct and cpu_vm_mask is placed wrong position.
    It might lead to reduce cache hit ratio.
    This patch has two change.
    1) Move the place of cpumask into last of mm_struct. Because usually cpumask
       is accessed only front bits when the system has cpu-hotplug capability
    2) Convert cpu_vm_mask into cpumask_var_t. It may help to reduce memory
       footprint if cpumask_size() will use nr_cpumask_bits properly in future.
    In addition, this patch change the name of cpu_vm_mask with cpu_vm_mask_var.
    It may help to detect out of tree cpu_vm_mask users.
    This patch has no functional change.
    [akpm@linux-foundation.org: build fix]
    [akpm@linux-foundation.org: coding-style fixes]
    Signed-off-by: default avatarKOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
    Cc: David Howells <dhowells@redhat.com>
    Cc: Koichi Yasutake <yasutake.koichi@jp.panasonic.com>
    Cc: Hugh Dickins <hughd@google.com>
    Cc: Chris Metcalf <cmetcalf@tilera.com>
    Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
    Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
cachetlb.txt 17.1 KB