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Date: Thu, 14 Nov 2019 14:19:11 +0100
From: David Hildenbrand <david@...hat.com>
To: linux-kernel@...r.kernel.org
Cc: linux-mm@...ck.org, linuxppc-dev@...ts.ozlabs.org,
David Hildenbrand <david@...hat.com>,
Michal Hocko <mhocko@...e.com>,
Andrew Morton <akpm@...ux-foundation.org>,
Oscar Salvador <osalvador@...e.de>,
Anshuman Khandual <anshuman.khandual@....com>,
Qian Cai <cai@....pw>, Pingfan Liu <kernelfans@...il.com>,
Stephen Rothwell <sfr@...b.auug.org.au>,
Dan Williams <dan.j.williams@...el.com>,
Pavel Tatashin <pasha.tatashin@...een.com>,
Vlastimil Babka <vbabka@...e.cz>,
Mel Gorman <mgorman@...hsingularity.net>,
Mike Rapoport <rppt@...ux.vnet.ibm.com>,
Wei Yang <richardw.yang@...ux.intel.com>,
Alexander Duyck <alexander.h.duyck@...ux.intel.com>,
Alexander Potapenko <glider@...gle.com>,
Arun KS <arunks@...eaurora.org>,
Michael Ellerman <mpe@...erman.id.au>
Subject: [PATCH v2 2/2] 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().
Cc: Michal Hocko <mhocko@...e.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Oscar Salvador <osalvador@...e.de>
Cc: Anshuman Khandual <anshuman.khandual@....com>
Cc: Qian Cai <cai@....pw>
Cc: Pingfan Liu <kernelfans@...il.com>
Cc: Stephen Rothwell <sfr@...b.auug.org.au>
Cc: Dan Williams <dan.j.williams@...el.com>
Cc: Pavel Tatashin <pasha.tatashin@...een.com>
Cc: Vlastimil Babka <vbabka@...e.cz>
Cc: Mel Gorman <mgorman@...hsingularity.net>
Cc: Mike Rapoport <rppt@...ux.vnet.ibm.com>
Cc: Wei Yang <richardw.yang@...ux.intel.com>
Cc: Alexander Duyck <alexander.h.duyck@...ux.intel.com>
Cc: Alexander Potapenko <glider@...gle.com>
Cc: Arun KS <arunks@...eaurora.org>
Cc: Michael Ellerman <mpe@...erman.id.au>
Signed-off-by: David Hildenbrand <david@...hat.com>
---
include/linux/page-isolation.h | 4 ++--
mm/memory_hotplug.c | 2 +-
mm/page_alloc.c | 21 +++++++--------------
mm/page_isolation.c | 2 +-
4 files changed, 11 insertions(+), 18 deletions(-)
diff --git a/include/linux/page-isolation.h b/include/linux/page-isolation.h
index 6861df759fad..148e65a9c606 100644
--- a/include/linux/page-isolation.h
+++ b/include/linux/page-isolation.h
@@ -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);
diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index 3b5cee4d3f4e..f06d33748607 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -1158,7 +1158,7 @@ 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);
}
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index f5ecbacb0e04..e4d8f3a1a6b6 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -8270,17 +8270,15 @@ 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";
@@ -8306,13 +8304,11 @@ 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;
@@ -8361,11 +8357,9 @@ 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
@@ -8379,8 +8373,7 @@ 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:
diff --git a/mm/page_isolation.c b/mm/page_isolation.c
index 21af88b718aa..1f8b9dfecbe8 100644
--- a/mm/page_isolation.c
+++ b/mm/page_isolation.c
@@ -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);
--
2.21.0
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