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mm: fix set pageblock migratetype in deferred struct page init 

On x86_64 MAX_ORDER_NR_PAGES is usually 4M, and a pageblock is usually
2M, so we only set one pageblock's migratetype in deferred_free_range()
if pfn is aligned to MAX_ORDER_NR_PAGES.  That means it causes
uninitialized migratetype blocks, you can see from "cat
/proc/pagetypeinfo", almost half blocks are Unmovable.

Also we missed freeing the last block in deferred_init_memmap(), it
causes memory leak.

Fixes: ac5d2539b2 ("mm: meminit: reduce number of times pageblocks are set during struct page init")
Link: http://lkml.kernel.org/r/57A3260F.4050709@huawei.com
Signed-off-by: Xishi Qiu <qiuxishi@huawei.com>
Cc: Taku Izumi <izumi.taku@jp.fujitsu.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Mel Gorman <mgorman@techsingularity.net>
Cc: Michal Hocko <mhocko@suse.com>
Cc: David Rientjes <rientjes@google.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: "Kirill A . Shutemov" <kirill.shutemov@linux.intel.com>
Cc: Kamezawa Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Xishi Qiu 2016-10-07 16:58:09 -07:00 committed by Linus Torvalds
parent e506b99696
commit e780149bcd
1 changed files with 13 additions and 7 deletions
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20
mm/page_alloc.c
View File

@ -1393,15 +1393,18 @@ static void __init deferred_free_range(struct page *page,
return;
/* Free a large naturally-aligned chunk if possible */
if (nr_pages == MAX_ORDER_NR_PAGES &&
(pfn & (MAX_ORDER_NR_PAGES-1)) == 0) {
if (nr_pages == pageblock_nr_pages &&
(pfn & (pageblock_nr_pages - 1)) == 0) {
set_pageblock_migratetype(page, MIGRATE_MOVABLE);
__free_pages_boot_core(page, MAX_ORDER-1);
__free_pages_boot_core(page, pageblock_order);
return;
}
for (i = 0; i < nr_pages; i++, page++)
for (i = 0; i < nr_pages; i++, page++, pfn++) {
if ((pfn & (pageblock_nr_pages - 1)) == 0)
set_pageblock_migratetype(page, MIGRATE_MOVABLE);
__free_pages_boot_core(page, 0);
}
}
/* Completion tracking for deferred_init_memmap() threads */
@ -1469,9 +1472,9 @@ static int __init deferred_init_memmap(void *data)
/*
* Ensure pfn_valid is checked every
* MAX_ORDER_NR_PAGES for memory holes
* pageblock_nr_pages for memory holes
*/
if ((pfn & (MAX_ORDER_NR_PAGES - 1)) == 0) {
if ((pfn & (pageblock_nr_pages - 1)) == 0) {
if (!pfn_valid(pfn)) {
page = NULL;
goto free_range;
@ -1484,7 +1487,7 @@ static int __init deferred_init_memmap(void *data)
}
/* Minimise pfn page lookups and scheduler checks */
if (page && (pfn & (MAX_ORDER_NR_PAGES - 1)) != 0) {
if (page && (pfn & (pageblock_nr_pages - 1)) != 0) {
page++;
} else {
nr_pages += nr_to_free;
@ -1520,6 +1523,9 @@ static int __init deferred_init_memmap(void *data)
free_base_page = NULL;
free_base_pfn = nr_to_free = 0;
}
/* Free the last block of pages to allocator */
nr_pages += nr_to_free;
deferred_free_range(free_base_page, free_base_pfn, nr_to_free);
first_init_pfn = max(end_pfn, first_init_pfn);
}