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| author | KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> | 2011-05-24 17:12:15 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2011-05-25 08:39:21 -0700 |
| commit | de03c72cfce5b263a674d04348b58475ec50163c (patch) | |
| tree | e2b035234440bcd1aa88078c3f9c8457d461ef9c /mm/init-mm.c | |
| parent | 692e0b35427a088bf75d9363788c61c7edbe93a5 (diff) | |
| download | lwn-de03c72cfce5b263a674d04348b58475ec50163c.tar.gz lwn-de03c72cfce5b263a674d04348b58475ec50163c.zip | |
mm: convert mm->cpu_vm_cpumask into cpumask_var_t
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: KOSAKI 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: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/init-mm.c')
| -rw-r--r-- | mm/init-mm.c | 1 |
1 files changed, 0 insertions, 1 deletions
diff --git a/mm/init-mm.c b/mm/init-mm.c index 1d29cdfe8ebb..4019979b2637 100644 --- a/mm/init-mm.c +++ b/mm/init-mm.c @@ -21,6 +21,5 @@ struct mm_struct init_mm = { .mmap_sem = __RWSEM_INITIALIZER(init_mm.mmap_sem), .page_table_lock = __SPIN_LOCK_UNLOCKED(init_mm.page_table_lock), .mmlist = LIST_HEAD_INIT(init_mm.mmlist), - .cpu_vm_mask = CPU_MASK_ALL, INIT_MM_CONTEXT(init_mm) }; |