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    SubjectRe: [PATCH 29/35] Do not store the PCP high and batch watermarks in the per-cpu structure
    On Mon, 16 Mar 2009, Mel Gorman wrote:

    > --- a/include/linux/mmzone.h
    > +++ b/include/linux/mmzone.h
    > @@ -166,8 +166,6 @@ static inline int is_unevictable_lru(enum lru_list l)
    >
    > struct per_cpu_pages {
    > int count; /* number of pages in the list */
    > - int high; /* high watermark, emptying needed */
    > - int batch; /* chunk size for buddy add/remove */


    There is a hole here on 64 bit systems.

    >
    > /* Lists of pages, one per migrate type stored on the pcp-lists */
    > struct list_head lists[MIGRATE_PCPTYPES];
    > @@ -285,6 +283,12 @@ struct zone {
    > unsigned long pages_mark[3];
    > };
    >
    > + /* high watermark for per-cpu lists, emptying needed */
    > + u16 pcp_high;
    > +
    > + /* chunk size for buddy add/remove to per-cpu lists*/
    > + u16 pcp_batch;
    > +

    Move this up to fill the hole?



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