On Fri, 2 Mar 2012 15:35:08 -0500
Naoya Horiguchi <n-horiguchi@xxxxxxxxxxxxx> wrote:
> Currently charge on shared anonyous pages is supposed not to moved
> in task migration. To implement this, we need to check that mapcount > 1,
> instread of > 2. So this patch fixes it.
>
> Signed-off-by: Naoya Horiguchi <n-horiguchi@xxxxxxxxxxxxx>
Hm. I don't remember why this check uses mapcount > 2...maybe bug.
Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx>
> ---
> mm/memcontrol.c | 2 +-
> 1 files changed, 1 insertions(+), 1 deletions(-)
>
> diff --git linux-next-20120228.orig/mm/memcontrol.c linux-next-20120228/mm/memcontrol.c
> index b6d1bab..785f6d3 100644
> --- linux-next-20120228.orig/mm/memcontrol.c
> +++ linux-next-20120228/mm/memcontrol.c
> @@ -5102,7 +5102,7 @@ static struct page *mc_handle_present_pte(struct vm_area_struct *vma,
> return NULL;
> if (PageAnon(page)) {
> /* we don't move shared anon */
> - if (!move_anon() || page_mapcount(page) > 2)
> + if (!move_anon() || page_mapcount(page) > 1)
> return NULL;
> } else if (!move_file())
> /* we ignore mapcount for file pages */
> --
> 1.7.7.6
>
> --
> To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
> the body of a message to majordomo@xxxxxxxxxxxxxxx
> More majordomo info at http://vger.kernel.org/majordomo-info.html
> Please read the FAQ at http://www.tux.org/lkml/
>
--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@xxxxxxxxx. For more info on Linux MM,
see: http://www.linux-mm.org/ .
Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/
Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>