On Wed, 14 Apr 2010 00:25:02 +0900
Minchan Kim <minchan.kim@xxxxxxxxx> wrote:
> __vmalloc_area_node never pass -1 to alloc_pages_node.
> It means node's validity check is unnecessary.
> So we can use alloc_pages_exact_node instead of alloc_pages_node.
> It could avoid comparison and branch as 6484eb3e2a81807722 tried.
>
> Cc: Nick Piggin <npiggin@xxxxxxx>
> Signed-off-by: Minchan Kim <minchan.kim@xxxxxxxxx>
Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx>
But, in another thinking,
- if (node < 0)
- page = alloc_page(gfp_mask);
may be better ;)
Thanks,
-Kame
> ---
> mm/vmalloc.c | 2 +-
> 1 files changed, 1 insertions(+), 1 deletions(-)
>
> diff --git a/mm/vmalloc.c b/mm/vmalloc.c
> index ae00746..7abf423 100644
> --- a/mm/vmalloc.c
> +++ b/mm/vmalloc.c
> @@ -1499,7 +1499,7 @@ static void *__vmalloc_area_node(struct vm_struct *area, gfp_t gfp_mask,
> if (node < 0)
> page = alloc_page(gfp_mask);
> else
> - page = alloc_pages_node(node, gfp_mask, 0);
> + page = alloc_pages_exact_node(node, gfp_mask, 0);
>
> if (unlikely(!page)) {
> /* Successfully allocated i pages, free them in __vunmap() */
> --
> 1.7.0.5
>
>
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