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author | Lai Jiangshan <laijs@cn.fujitsu.com> | 2012-12-11 16:03:20 -0800 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2012-12-11 17:22:28 -0800 |
commit | e455a9b92d6e19a3f0f7eb6f6241efa566a7e81a (patch) | |
tree | f920832f9e55ecf3e178e498f8894363748bb6c7 /mm | |
parent | 511c2aba8f07fc45bdcba548cb63f7b8a450c6dc (diff) | |
download | linux-e455a9b92d6e19a3f0f7eb6f6241efa566a7e81a.tar.gz linux-e455a9b92d6e19a3f0f7eb6f6241efa566a7e81a.tar.bz2 linux-e455a9b92d6e19a3f0f7eb6f6241efa566a7e81a.zip |
memory_hotplug: handle empty zone when online_movable/online_kernel
Make online_movable/online_kernel can empty a zone or can move memory to a
empty zone.
Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com>
Signed-off-by: Wen Congyang <wency@cn.fujitsu.com>
Cc: Yasuaki Ishimatsu <isimatu.yasuaki@jp.fujitsu.com>
Cc: Lai Jiangshan <laijs@cn.fujitsu.com>
Cc: Jiang Liu <jiang.liu@huawei.com>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: Minchan Kim <minchan.kim@gmail.com>
Cc: Mel Gorman <mgorman@suse.de>
Cc: David Rientjes <rientjes@google.com>
Cc: Yinghai Lu <yinghai@kernel.org>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Cc: Greg KH <greg@kroah.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm')
-rw-r--r-- | mm/memory_hotplug.c | 51 |
1 files changed, 45 insertions, 6 deletions
diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c index 5c1f4959e6b4..c370491bdb97 100644 --- a/mm/memory_hotplug.c +++ b/mm/memory_hotplug.c @@ -219,8 +219,17 @@ static void resize_zone(struct zone *zone, unsigned long start_pfn, { zone_span_writelock(zone); - zone->zone_start_pfn = start_pfn; - zone->spanned_pages = end_pfn - start_pfn; + if (end_pfn - start_pfn) { + zone->zone_start_pfn = start_pfn; + zone->spanned_pages = end_pfn - start_pfn; + } else { + /* + * make it consist as free_area_init_core(), + * if spanned_pages = 0, then keep start_pfn = 0 + */ + zone->zone_start_pfn = 0; + zone->spanned_pages = 0; + } zone_span_writeunlock(zone); } @@ -236,10 +245,19 @@ static void fix_zone_id(struct zone *zone, unsigned long start_pfn, set_page_links(pfn_to_page(pfn), zid, nid, pfn); } -static int move_pfn_range_left(struct zone *z1, struct zone *z2, +static int __meminit move_pfn_range_left(struct zone *z1, struct zone *z2, unsigned long start_pfn, unsigned long end_pfn) { + int ret; unsigned long flags; + unsigned long z1_start_pfn; + + if (!z1->wait_table) { + ret = init_currently_empty_zone(z1, start_pfn, + end_pfn - start_pfn, MEMMAP_HOTPLUG); + if (ret) + return ret; + } pgdat_resize_lock(z1->zone_pgdat, &flags); @@ -253,7 +271,13 @@ static int move_pfn_range_left(struct zone *z1, struct zone *z2, if (end_pfn <= z2->zone_start_pfn) goto out_fail; - resize_zone(z1, z1->zone_start_pfn, end_pfn); + /* use start_pfn for z1's start_pfn if z1 is empty */ + if (z1->spanned_pages) + z1_start_pfn = z1->zone_start_pfn; + else + z1_start_pfn = start_pfn; + + resize_zone(z1, z1_start_pfn, end_pfn); resize_zone(z2, end_pfn, z2->zone_start_pfn + z2->spanned_pages); pgdat_resize_unlock(z1->zone_pgdat, &flags); @@ -266,10 +290,19 @@ out_fail: return -1; } -static int move_pfn_range_right(struct zone *z1, struct zone *z2, +static int __meminit move_pfn_range_right(struct zone *z1, struct zone *z2, unsigned long start_pfn, unsigned long end_pfn) { + int ret; unsigned long flags; + unsigned long z2_end_pfn; + + if (!z2->wait_table) { + ret = init_currently_empty_zone(z2, start_pfn, + end_pfn - start_pfn, MEMMAP_HOTPLUG); + if (ret) + return ret; + } pgdat_resize_lock(z1->zone_pgdat, &flags); @@ -283,8 +316,14 @@ static int move_pfn_range_right(struct zone *z1, struct zone *z2, if (start_pfn >= z1->zone_start_pfn + z1->spanned_pages) goto out_fail; + /* use end_pfn for z2's end_pfn if z2 is empty */ + if (z2->spanned_pages) + z2_end_pfn = z2->zone_start_pfn + z2->spanned_pages; + else + z2_end_pfn = end_pfn; + resize_zone(z1, z1->zone_start_pfn, start_pfn); - resize_zone(z2, start_pfn, z2->zone_start_pfn + z2->spanned_pages); + resize_zone(z2, start_pfn, z2_end_pfn); pgdat_resize_unlock(z1->zone_pgdat, &flags); |