lkml.org 
[lkml]   [2010]   [May]   [8]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    Patch in this message
    /
    From
    Subject[PATCH 08/22] lmb: Add get_free_all_memory_range()
    Date
    get_free_all_memory_range is for CONFIG_NO_BOOTMEM=y, and will be called by
    free_all_memory_core_early().

    It will use early_node_map aka active ranges subtract lmb.reserved to
    get all free range, and those ranges will convert to slab pages.

    -v3: use __lmb_find_base() to get range free buffer.

    Signed-off-by: Yinghai Lu <yinghai@kernel.org>
    Cc: Jan Beulich <jbeulich@novell.com>
    ---
    include/linux/lmb.h | 2 +
    mm/lmb.c | 86 ++++++++++++++++++++++++++++++++++++++++++++++++++-
    2 files changed, 87 insertions(+), 1 deletions(-)

    diff --git a/include/linux/lmb.h b/include/linux/lmb.h
    index 2c008b9..aaef2ca 100644
    --- a/include/linux/lmb.h
    +++ b/include/linux/lmb.h
    @@ -93,6 +93,8 @@ u64 __lmb_find_area(u64 ei_start, u64 ei_last, u64 start, u64 end,
    u64 lmb_find_area(u64 start, u64 end, u64 size, u64 align);

    void lmb_to_bootmem(u64 start, u64 end);
    +struct range;
    +int get_free_all_memory_range(struct range **rangep, int nodeid);

    #include <asm/lmb.h>

    diff --git a/mm/lmb.c b/mm/lmb.c
    index ccbc76d..2e19df9 100644
    --- a/mm/lmb.c
    +++ b/mm/lmb.c
    @@ -630,7 +630,91 @@ void __init lmb_free_area(u64 start, u64 end)
    __check_and_double_region_array(&lmb.reserved, &lmb_reserved_region[0]);
    }

    -#ifndef CONFIG_NO_BOOTMEM
    +static __init struct range *find_range_array(int count)
    +{
    + u64 end, size, mem;
    + struct range *range;
    +
    + size = sizeof(struct range) * count;
    + end = lmb.default_alloc_limit;
    +
    + mem = __lmb_find_base(size, sizeof(struct range), end);
    + if (mem == -1ULL)
    + panic("can not find more space for range array");
    +
    + /*
    + * This range is tempoaray, so don't reserve it, it will not be
    + * overlapped because We will not alloccate new buffer before
    + * We discard this one
    + */
    + range = __va(mem);
    + memset(range, 0, size);
    +
    + return range;
    +}
    +
    +#ifdef CONFIG_NO_BOOTMEM
    +static void __init subtract_lmb_reserved(struct range *range, int az)
    +{
    + int i, count;
    + u64 final_start, final_end;
    +
    + /* Take out region array itself at first*/
    + if (lmb.reserved.region != lmb_reserved_region)
    + lmb_free(__pa(lmb.reserved.region), sizeof(struct lmb_property) * lmb.reserved.nr_regions);
    +
    + count = lmb.reserved.cnt;
    +
    + pr_info("Subtract (%d early reservations)\n", count);
    +
    + for (i = 0; i < count; i++) {
    + struct lmb_property *r = &lmb.reserved.region[i];
    + pr_info(" #%d [%010llx - %010llx]\n", i, r->base, r->base + r->size);
    + final_start = PFN_DOWN(r->base);
    + final_end = PFN_UP(r->base + r->size);
    + if (final_start >= final_end)
    + continue;
    + subtract_range(range, az, final_start, final_end);
    + }
    + /* Put region array back ? */
    + if (lmb.reserved.region != lmb_reserved_region)
    + lmb_reserve(__pa(lmb.reserved.region), sizeof(struct lmb_property) * lmb.reserved.nr_regions);
    +}
    +
    +int __init get_free_all_memory_range(struct range **rangep, int nodeid)
    +{
    + int count;
    + struct range *range;
    + int nr_range;
    +
    + count = lmb.reserved.cnt * 2;
    +
    + range = find_range_array(count);
    + nr_range = 0;
    +
    + /*
    + * Use early_node_map[] and lmb.reserved.region to get range array
    + * at first
    + */
    + nr_range = add_from_early_node_map(range, count, nr_range, nodeid);
    +#ifdef CONFIG_X86_32
    + subtract_range(range, count, max_low_pfn, -1ULL);
    +#endif
    + subtract_lmb_reserved(range, count);
    + nr_range = clean_sort_range(range, count);
    +
    + /* Need to clear it ? */
    + if (nodeid == MAX_NUMNODES) {
    + memset(&lmb.reserved.region[0], 0, sizeof(struct lmb_property) * lmb.reserved.nr_regions);
    + lmb.reserved.region = NULL;
    + lmb.reserved.nr_regions = 0;
    + lmb.reserved.cnt = 0;
    + }
    +
    + *rangep = range;
    + return nr_range;
    +}
    +#else
    void __init lmb_to_bootmem(u64 start, u64 end)
    {
    int i, count;
    --
    1.6.4.2


    \
     
     \ /
      Last update: 2010-05-08 17:27    [W:0.026 / U:60.600 seconds]
    ©2003-2016 Jasper Spaans. hosted at Digital OceanAdvertise on this site