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    SubjectRe: [RFC PATCH 10/12] mm: add the buddy system interface
    On 2015/06/09 19:04, Xishi Qiu wrote:
    > On 2015/6/9 15:12, Kamezawa Hiroyuki wrote:
    >
    >> On 2015/06/04 22:04, Xishi Qiu wrote:
    >>> Add the buddy system interface for address range mirroring feature.
    >>> Allocate mirrored pages in MIGRATE_MIRROR list. If there is no mirrored pages
    >>> left, use other types pages.
    >>>
    >>> Signed-off-by: Xishi Qiu <qiuxishi@huawei.com>
    >>> ---
    >>> mm/page_alloc.c | 40 +++++++++++++++++++++++++++++++++++++++-
    >>> 1 file changed, 39 insertions(+), 1 deletion(-)
    >>>
    >>> diff --git a/mm/page_alloc.c b/mm/page_alloc.c
    >>> index d4d2066..0fb55288 100644
    >>> --- a/mm/page_alloc.c
    >>> +++ b/mm/page_alloc.c
    >>> @@ -599,6 +599,26 @@ static inline bool is_mirror_pfn(unsigned long pfn)
    >>>
    >>> return false;
    >>> }
    >>> +
    >>> +static inline bool change_to_mirror(gfp_t gfp_flags, int high_zoneidx)
    >>> +{
    >>> + /*
    >>> + * Do not alloc mirrored memory below 4G, because 0-4G is
    >>> + * all mirrored by default, and the list is always empty.
    >>> + */
    >>> + if (high_zoneidx < ZONE_NORMAL)
    >>> + return false;
    >>> +
    >>> + /* Alloc mirrored memory for only kernel */
    >>> + if (gfp_flags & __GFP_MIRROR)
    >>> + return true;
    >>
    >> GFP_KERNEL itself should imply mirror, I think.
    >>
    >
    > Hi Kame,
    >
    > How about like this: #define GFP_KERNEL (__GFP_WAIT | __GFP_IO | __GFP_FS | __GFP_MIRROR) ?
    >

    Hm.... it cannot cover GFP_ATOMIC at el.

    I guess, mirrored memory should be allocated if !__GFP_HIGHMEM or !__GFP_MOVABLE

    thanks,
    -Kame

    Thanks,
    -Kame





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