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authorMichal Hocko <mhocko@suse.com>2019-05-14 02:21:24 +0200
committerLinus Torvalds <torvalds@linux-foundation.org>2019-05-14 18:47:49 +0200
commit5557c766abad25acc8091ccb9641b96e3b3da06f (patch)
tree37c82ae65becf5198a2b4a213558b1e9d645a67f /mm
parentmm: initialize MAX_ORDER_NR_PAGES at a time instead of doing larger sections (diff)
downloadlinux-5557c766abad25acc8091ccb9641b96e3b3da06f.tar.xz
linux-5557c766abad25acc8091ccb9641b96e3b3da06f.zip
mm, memory_hotplug: cleanup memory offline path
check_pages_isolated_cb currently accounts the whole pfn range as being offlined if test_pages_isolated suceeds on the range. This is based on the assumption that all pages in the range are freed which is currently the case in most cases but it won't be with later changes, as pages marked as vmemmap won't be isolated. Move the offlined pages counting to offline_isolated_pages_cb and rely on __offline_isolated_pages to return the correct value. check_pages_isolated_cb will still do it's primary job and check the pfn range. While we are at it remove check_pages_isolated and offline_isolated_pages and use directly walk_system_ram_range as do in online_pages. Link: http://lkml.kernel.org/r/20190408082633.2864-2-osalvador@suse.de Reviewed-by: David Hildenbrand <david@redhat.com> Signed-off-by: Michal Hocko <mhocko@suse.com> Signed-off-by: Oscar Salvador <osalvador@suse.de> Cc: Dan Williams <dan.j.williams@intel.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.c45
-rw-r--r--mm/page_alloc.c11
2 files changed, 20 insertions, 36 deletions
diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index a279671b9968..75f9f6590677 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -1449,15 +1449,10 @@ static int
offline_isolated_pages_cb(unsigned long start, unsigned long nr_pages,
void *data)
{
- __offline_isolated_pages(start, start + nr_pages);
- return 0;
-}
+ unsigned long *offlined_pages = (unsigned long *)data;
-static void
-offline_isolated_pages(unsigned long start_pfn, unsigned long end_pfn)
-{
- walk_system_ram_range(start_pfn, end_pfn - start_pfn, NULL,
- offline_isolated_pages_cb);
+ *offlined_pages += __offline_isolated_pages(start, start + nr_pages);
+ return 0;
}
/*
@@ -1467,26 +1462,7 @@ static int
check_pages_isolated_cb(unsigned long start_pfn, unsigned long nr_pages,
void *data)
{
- int ret;
- long offlined = *(long *)data;
- ret = test_pages_isolated(start_pfn, start_pfn + nr_pages, true);
- offlined = nr_pages;
- if (!ret)
- *(long *)data += offlined;
- return ret;
-}
-
-static long
-check_pages_isolated(unsigned long start_pfn, unsigned long end_pfn)
-{
- long offlined = 0;
- int ret;
-
- ret = walk_system_ram_range(start_pfn, end_pfn - start_pfn, &offlined,
- check_pages_isolated_cb);
- if (ret < 0)
- offlined = (long)ret;
- return offlined;
+ return test_pages_isolated(start_pfn, start_pfn + nr_pages, true);
}
static int __init cmdline_parse_movable_node(char *p)
@@ -1571,7 +1547,7 @@ static int __ref __offline_pages(unsigned long start_pfn,
unsigned long end_pfn)
{
unsigned long pfn, nr_pages;
- long offlined_pages;
+ unsigned long offlined_pages = 0;
int ret, node, nr_isolate_pageblock;
unsigned long flags;
unsigned long valid_start, valid_end;
@@ -1647,14 +1623,15 @@ static int __ref __offline_pages(unsigned long start_pfn,
goto failed_removal_isolated;
}
/* check again */
- offlined_pages = check_pages_isolated(start_pfn, end_pfn);
- } while (offlined_pages < 0);
+ ret = walk_system_ram_range(start_pfn, end_pfn - start_pfn,
+ NULL, check_pages_isolated_cb);
+ } while (ret);
- pr_info("Offlined Pages %ld\n", offlined_pages);
/* Ok, all of our target is isolated.
We cannot do rollback at this point. */
- offline_isolated_pages(start_pfn, end_pfn);
-
+ walk_system_ram_range(start_pfn, end_pfn - start_pfn,
+ &offlined_pages, offline_isolated_pages_cb);
+ pr_info("Offlined Pages %ld\n", offlined_pages);
/*
* Onlining will reset pagetype flags and makes migrate type
* MOVABLE, so just need to decrease the number of isolated
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 96ca65636e40..c45da9fe3ce1 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -8453,7 +8453,7 @@ void zone_pcp_reset(struct zone *zone)
* All pages in the range must be in a single zone and isolated
* before calling this.
*/
-void
+unsigned long
__offline_isolated_pages(unsigned long start_pfn, unsigned long end_pfn)
{
struct page *page;
@@ -8461,12 +8461,15 @@ __offline_isolated_pages(unsigned long start_pfn, unsigned long end_pfn)
unsigned int order, i;
unsigned long pfn;
unsigned long flags;
+ unsigned long offlined_pages = 0;
+
/* find the first valid pfn */
for (pfn = start_pfn; pfn < end_pfn; pfn++)
if (pfn_valid(pfn))
break;
if (pfn == end_pfn)
- return;
+ return offlined_pages;
+
offline_mem_sections(pfn, end_pfn);
zone = page_zone(pfn_to_page(pfn));
spin_lock_irqsave(&zone->lock, flags);
@@ -8484,12 +8487,14 @@ __offline_isolated_pages(unsigned long start_pfn, unsigned long end_pfn)
if (unlikely(!PageBuddy(page) && PageHWPoison(page))) {
pfn++;
SetPageReserved(page);
+ offlined_pages++;
continue;
}
BUG_ON(page_count(page));
BUG_ON(!PageBuddy(page));
order = page_order(page);
+ offlined_pages += 1 << order;
#ifdef CONFIG_DEBUG_VM
pr_info("remove from free list %lx %d %lx\n",
pfn, 1 << order, end_pfn);
@@ -8502,6 +8507,8 @@ __offline_isolated_pages(unsigned long start_pfn, unsigned long end_pfn)
pfn += (1 << order);
}
spin_unlock_irqrestore(&zone->lock, flags);
+
+ return offlined_pages;
}
#endif