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    Subject[PATCH 6/9] Allow HugeTLB allocations to use ZONE_EASYRCLM
    Date

    On ppc64 at least, a HugeTLB is the same size as a memory section. Hence,
    it causes no fragmentation that is worth caring about because a section can
    still be offlined.

    Once HugeTLB is allowed to use ZONE_EASYRCLM, the size of the zone becomes a
    "soft" area where HugeTLB allocations may be satisified. For example, take
    a situation where a system administrator is not willing to reserve HugeTLB
    pages at boot time. In this case, he can use kernelcore to size the EasyRclm
    zone which is still usable by normal processes. If a job starts that need
    HugeTLB pages, one could dd a file the size of physical memory, delete it
    and have a good chance of getting a number of HugeTLB pages. To get all of
    EasyRclm as HugeTLB pages, the ability to drain per-cpu pages is required.

    Signed-off-by: Mel Gorman <mel@csn.ul.ie>
    diff -rup -X /usr/src/patchset-0.6/bin//dontdiff linux-2.6.16-rc1-mm3-106_zonechoose/mm/hugetlb.c linux-2.6.16-rc1-mm3-107_hugetlb_use_easyrclm/mm/hugetlb.c
    --- linux-2.6.16-rc1-mm3-106_zonechoose/mm/hugetlb.c 2006-01-17 07:44:47.000000000 +0000
    +++ linux-2.6.16-rc1-mm3-107_hugetlb_use_easyrclm/mm/hugetlb.c 2006-01-26 18:13:43.000000000 +0000
    @@ -49,7 +49,7 @@ static struct page *dequeue_huge_page(st

    for (z = zonelist->zones; *z; z++) {
    nid = (*z)->zone_pgdat->node_id;
    - if (cpuset_zone_allowed(*z, GFP_HIGHUSER) &&
    + if (cpuset_zone_allowed(*z, GFP_RCLMUSER) &&
    !list_empty(&hugepage_freelists[nid]))
    break;
    }
    @@ -68,7 +68,7 @@ static struct page *alloc_fresh_huge_pag
    {
    static int nid = 0;
    struct page *page;
    - page = alloc_pages_node(nid, GFP_HIGHUSER|__GFP_COMP|__GFP_NOWARN,
    + page = alloc_pages_node(nid, GFP_RCLMUSER|__GFP_COMP|__GFP_NOWARN,
    HUGETLB_PAGE_ORDER);
    nid = (nid + 1) % num_online_nodes();
    if (page) {
    diff -rup -X /usr/src/patchset-0.6/bin//dontdiff linux-2.6.16-rc1-mm3-106_zonechoose/mm/mempolicy.c linux-2.6.16-rc1-mm3-107_hugetlb_use_easyrclm/mm/mempolicy.c
    --- linux-2.6.16-rc1-mm3-106_zonechoose/mm/mempolicy.c 2006-01-25 13:42:46.000000000 +0000
    +++ linux-2.6.16-rc1-mm3-107_hugetlb_use_easyrclm/mm/mempolicy.c 2006-01-26 18:13:43.000000000 +0000
    @@ -1169,7 +1169,7 @@ struct zonelist *huge_zonelist(struct vm
    unsigned nid;

    nid = interleave_nid(pol, vma, addr, HPAGE_SHIFT);
    - return NODE_DATA(nid)->node_zonelists + gfp_zone(GFP_HIGHUSER);
    + return NODE_DATA(nid)->node_zonelists + gfp_zone(GFP_RCLMUSER);
    }
    return zonelist_policy(GFP_HIGHUSER, pol);
    }
    -
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