Messages in this thread Patch in this message | | | From | Yinghai Lu <> | Subject | [PATCH 09/33] lmb: Add get_free_all_memory_range() | Date | Tue, 30 Mar 2010 19:16:54 -0700 |
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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 1e236d1..2ee2cc1 100644 --- a/include/linux/lmb.h +++ b/include/linux/lmb.h @@ -92,6 +92,8 @@ 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 f25f98c..62efdb4 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
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