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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 /init | |
| parent | 692e0b35427a088bf75d9363788c61c7edbe93a5 (diff) | |
| download | linux-stable-de03c72cfce5b263a674d04348b58475ec50163c.tar.gz linux-stable-de03c72cfce5b263a674d04348b58475ec50163c.tar.bz2 linux-stable-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 'init')
| -rw-r--r-- | init/main.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/init/main.c b/init/main.c index 48df882d51d2..22da33918aef 100644 --- a/init/main.c +++ b/init/main.c @@ -509,6 +509,8 @@ asmlinkage void __init start_kernel(void) sort_main_extable(); trap_init(); mm_init(); + BUG_ON(mm_init_cpumask(&init_mm, 0)); + /* * Set up the scheduler prior starting any interrupts (such as the * timer interrupt). Full topology setup happens at smp_init() |