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mm: remove "count" parameter from has_unmovable_pages() 

Now that the memory isolate notifier is gone, the parameter is always 0.
Drop it and cleanup has_unmovable_pages().

Link: http://lkml.kernel.org/r/20191114131911.11783-3-david@redhat.com
Signed-off-by: David Hildenbrand <david@redhat.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Cc: Oscar Salvador <osalvador@suse.de>
Cc: Anshuman Khandual <anshuman.khandual@arm.com>
Cc: Qian Cai <cai@lca.pw>
Cc: Pingfan Liu <kernelfans@gmail.com>
Cc: Stephen Rothwell <sfr@canb.auug.org.au>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: Pavel Tatashin <pasha.tatashin@soleen.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Mel Gorman <mgorman@techsingularity.net>
Cc: Mike Rapoport <rppt@linux.vnet.ibm.com>
Cc: Wei Yang <richardw.yang@linux.intel.com>
Cc: Alexander Duyck <alexander.h.duyck@linux.intel.com>
Cc: Alexander Potapenko <glider@google.com>
Cc: Arun KS <arunks@codeaurora.org>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
David Hildenbrand 2020-01-30 22:14:04 -08:00 committed by Linus Torvalds
parent 3f9903b9ca
commit fe4c86c916
4 changed files with 11 additions and 18 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
include/linux/page-isolation.h
View File

@ -33,8 +33,8 @@ static inline bool is_migrate_isolate(int migratetype)
#define MEMORY_OFFLINE 0x1
#define REPORT_FAILURE 0x2
bool has_unmovable_pages(struct zone *zone, struct page *page, int count,
int migratetype, int flags);
bool has_unmovable_pages(struct zone *zone, struct page *page, int migratetype,
int flags);
void set_pageblock_migratetype(struct page *page, int migratetype);
int move_freepages_block(struct zone *zone, struct page *page,
int migratetype, int *num_movable);

2
mm/memory_hotplug.c
View File

@ -1182,7 +1182,7 @@ static bool is_pageblock_removable_nolock(unsigned long pfn)
if (!zone_spans_pfn(zone, pfn))
return false;
return !has_unmovable_pages(zone, page, 0, MIGRATE_MOVABLE,
return !has_unmovable_pages(zone, page, MIGRATE_MOVABLE,
MEMORY_OFFLINE);
}

21
mm/page_alloc.c
View File

@ -8180,17 +8180,15 @@ void *__init alloc_large_system_hash(const char *tablename,
/*
* This function checks whether pageblock includes unmovable pages or not.
* If @count is not zero, it is okay to include less @count unmovable pages
*
* PageLRU check without isolation or lru_lock could race so that
* MIGRATE_MOVABLE block might include unmovable pages. And __PageMovable
* check without lock_page also may miss some movable non-lru pages at
* race condition. So you can't expect this function should be exact.
*/
bool has_unmovable_pages(struct zone *zone, struct page *page, int count,
int migratetype, int flags)
bool has_unmovable_pages(struct zone *zone, struct page *page, int migratetype,
int flags)
{
unsigned long found;
unsigned long iter = 0;
unsigned long pfn = page_to_pfn(page);
const char *reason = "unmovable page";
@ -8216,13 +8214,11 @@ bool has_unmovable_pages(struct zone *zone, struct page *page, int count,
goto unmovable;
}
for (found = 0; iter < pageblock_nr_pages; iter++) {
unsigned long check = pfn + iter;
if (!pfn_valid_within(check))
for (; iter < pageblock_nr_pages; iter++) {
if (!pfn_valid_within(pfn + iter))
continue;
page = pfn_to_page(check);
page = pfn_to_page(pfn + iter);
if (PageReserved(page))
goto unmovable;
@ -8271,11 +8267,9 @@ bool has_unmovable_pages(struct zone *zone, struct page *page, int count,
if ((flags & MEMORY_OFFLINE) && PageHWPoison(page))
continue;
if (__PageMovable(page))
if (__PageMovable(page) || PageLRU(page))
continue;
if (!PageLRU(page))
found++;
/*
* If there are RECLAIMABLE pages, we need to check
* it. But now, memory offline itself doesn't call
@ -8289,8 +8283,7 @@ bool has_unmovable_pages(struct zone *zone, struct page *page, int count,
* is set to both of a memory hole page and a _used_ kernel
* page at boot.
*/
if (found > count)
goto unmovable;
goto unmovable;
}
return false;
unmovable:

2
mm/page_isolation.c
View File

@ -37,7 +37,7 @@ static int set_migratetype_isolate(struct page *page, int migratetype, int isol_
* FIXME: Now, memory hotplug doesn't call shrink_slab() by itself.
* We just check MOVABLE pages.
*/
if (!has_unmovable_pages(zone, page, 0, migratetype, isol_flags)) {
if (!has_unmovable_pages(zone, page, migratetype, isol_flags)) {
unsigned long nr_pages;
int mt = get_pageblock_migratetype(page);