On Thu, Oct 08, 2015 at 02:35:50PM +0800, Hui Zhu wrote:
> This patch add PG_movable to mark a page as movable.
> And when system call migrate function, it will call the interfaces isolate,
> put and migrate to control it.
>
> There is a patch for page migrate interface in LKML. But for zsmalloc,
> it is too deep inside the file system. So I add another one.
>
> Signed-off-by: Hui Zhu <zhuhui@xxxxxxxxxx>
> ---
> include/linux/mm_types.h | 6 ++++++
> include/linux/page-flags.h | 3 +++
> mm/compaction.c | 6 ++++++
> mm/debug.c | 1 +
> mm/migrate.c | 17 +++++++++++++----
> mm/vmscan.c | 2 +-
> 6 files changed, 30 insertions(+), 5 deletions(-)
>
> diff --git a/include/linux/mm_types.h b/include/linux/mm_types.h
> index 3d6baa7..132afb0 100644
> --- a/include/linux/mm_types.h
> +++ b/include/linux/mm_types.h
> @@ -12,6 +12,7 @@
> #include <linux/cpumask.h>
> #include <linux/uprobes.h>
> #include <linux/page-flags-layout.h>
> +#include <linux/migrate_mode.h>
> #include <asm/page.h>
> #include <asm/mmu.h>
>
> @@ -196,6 +197,11 @@ struct page {
> #ifdef LAST_CPUPID_NOT_IN_PAGE_FLAGS
> int _last_cpupid;
> #endif
> +
> + int (*isolate)(struct page *page);
> + void (*put)(struct page *page);
> + int (*migrate)(struct page *page, struct page *newpage, int force,
> + enum migrate_mode mode);
> }
That's no-go. We are not going to add three pointers to struct page. It
would cost ~0.5% of system memory.
NAK.
--
Kirill A. Shutemov
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