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Subject[PATCH v5 5/5] page_alloc: Bootmem limit with movablecore_map
Date
This patch make sure bootmem will not allocate memory from areas that
may be ZONE_MOVABLE. The map info is from movablecore_map boot option.

Signed-off-by: Tang Chen <tangchen@cn.fujitsu.com>
Reviewed-by: Wen Congyang <wency@cn.fujitsu.com>
Reviewed-by: Lai Jiangshan <laijs@cn.fujitsu.com>
Tested-by: Lin Feng <linfeng@cn.fujitsu.com>
---
include/linux/memblock.h | 1 +
mm/memblock.c | 18 +++++++++++++++++-
2 files changed, 18 insertions(+), 1 deletions(-)

diff --git a/include/linux/memblock.h b/include/linux/memblock.h
index d452ee1..6e25597 100644
--- a/include/linux/memblock.h
+++ b/include/linux/memblock.h
@@ -42,6 +42,7 @@ struct memblock {

extern struct memblock memblock;
extern int memblock_debug;
+extern struct movablecore_map movablecore_map;

#define memblock_dbg(fmt, ...) \
if (memblock_debug) printk(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__)
diff --git a/mm/memblock.c b/mm/memblock.c
index 88adc8a..1e48774 100644
--- a/mm/memblock.c
+++ b/mm/memblock.c
@@ -101,6 +101,7 @@ phys_addr_t __init_memblock memblock_find_in_range_node(phys_addr_t start,
{
phys_addr_t this_start, this_end, cand;
u64 i;
+ int curr = movablecore_map.nr_map - 1;

/* pump up @end */
if (end == MEMBLOCK_ALLOC_ACCESSIBLE)
@@ -114,13 +115,28 @@ phys_addr_t __init_memblock memblock_find_in_range_node(phys_addr_t start,
this_start = clamp(this_start, start, end);
this_end = clamp(this_end, start, end);

- if (this_end < size)
+restart:
+ if (this_end <= this_start || this_end < size)
continue;

+ for (; curr >= 0; curr--) {
+ if ((movablecore_map.map[curr].start_pfn << PAGE_SHIFT)
+ < this_end)
+ break;
+ }
+
cand = round_down(this_end - size, align);
+ if (curr >= 0 &&
+ cand < movablecore_map.map[curr].end_pfn << PAGE_SHIFT) {
+ this_end = movablecore_map.map[curr].start_pfn
+ << PAGE_SHIFT;
+ goto restart;
+ }
+
if (cand >= this_start)
return cand;
}
+
return 0;
}

--
1.7.1


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