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author | KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> | 2011-05-24 17:12:15 -0700 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2011-05-25 08:39:21 -0700 |
commit | de03c72cfce5b263a674d04348b58475ec50163c (patch) | |
tree | e2b035234440bcd1aa88078c3f9c8457d461ef9c /include/linux/mm_types.h | |
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 'include/linux/mm_types.h')
-rw-r--r-- | include/linux/mm_types.h | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/include/linux/mm_types.h b/include/linux/mm_types.h index 201998e5b530..c2f9ea7922f4 100644 --- a/include/linux/mm_types.h +++ b/include/linux/mm_types.h @@ -265,8 +265,6 @@ struct mm_struct { struct linux_binfmt *binfmt; - cpumask_t cpu_vm_mask; - /* Architecture-specific MM context */ mm_context_t context; @@ -316,9 +314,14 @@ struct mm_struct { #ifdef CONFIG_TRANSPARENT_HUGEPAGE pgtable_t pmd_huge_pte; /* protected by page_table_lock */ #endif + + cpumask_var_t cpu_vm_mask_var; }; /* Future-safe accessor for struct mm_struct's cpu_vm_mask. */ -#define mm_cpumask(mm) (&(mm)->cpu_vm_mask) +static inline cpumask_t *mm_cpumask(struct mm_struct *mm) +{ + return mm->cpu_vm_mask_var; +} #endif /* _LINUX_MM_TYPES_H */ |