summaryrefslogtreecommitdiff
path: root/mm/page_isolation.c
diff options
context:
space:
mode:
authorMichal Hocko <mhocko@suse.com>2018-12-28 00:33:56 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2018-12-28 12:11:46 -0800
commitd381c54760dcfad23743da40516e7e003d73952a (patch)
tree3bf71c22e7f9c41f4f76b7d356882e846d29d281 /mm/page_isolation.c
parent2932c8b05056d4ba702f70f4deebe1c97600e62b (diff)
mm: only report isolation failures when offlining memory
Heiko has complained that his log is swamped by warnings from has_unmovable_pages [ 20.536664] page dumped because: has_unmovable_pages [ 20.536792] page:000003d081ff4080 count:1 mapcount:0 mapping:000000008ff88600 index:0x0 compound_mapcount: 0 [ 20.536794] flags: 0x3fffe0000010200(slab|head) [ 20.536795] raw: 03fffe0000010200 0000000000000100 0000000000000200 000000008ff88600 [ 20.536796] raw: 0000000000000000 0020004100000000 ffffffff00000001 0000000000000000 [ 20.536797] page dumped because: has_unmovable_pages [ 20.536814] page:000003d0823b0000 count:1 mapcount:0 mapping:0000000000000000 index:0x0 [ 20.536815] flags: 0x7fffe0000000000() [ 20.536817] raw: 07fffe0000000000 0000000000000100 0000000000000200 0000000000000000 [ 20.536818] raw: 0000000000000000 0000000000000000 ffffffff00000001 0000000000000000 which are not triggered by the memory hotplug but rather CMA allocator. The original idea behind dumping the page state for all call paths was that these messages will be helpful debugging failures. From the above it seems that this is not the case for the CMA path because we are lacking much more context. E.g the second reported page might be a CMA allocated page. It is still interesting to see a slab page in the CMA area but it is hard to tell whether this is bug from the above output alone. Address this issue by dumping the page state only on request. Both start_isolate_page_range and has_unmovable_pages already have an argument to ignore hwpoison pages so make this argument more generic and turn it into flags and allow callers to combine non-default modes into a mask. While we are at it, has_unmovable_pages call from is_pageblock_removable_nolock (sysfs removable file) is questionable to report the failure so drop it from there as well. Link: http://lkml.kernel.org/r/20181218092802.31429-1-mhocko@kernel.org Signed-off-by: Michal Hocko <mhocko@suse.com> Reported-by: Heiko Carstens <heiko.carstens@de.ibm.com> Reviewed-by: Oscar Salvador <osalvador@suse.de> Cc: Anshuman Khandual <anshuman.khandual@arm.com> Cc: Stephen Rothwell <sfr@canb.auug.org.au> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/page_isolation.c')
-rw-r--r--mm/page_isolation.c10
1 files changed, 4 insertions, 6 deletions
diff --git a/mm/page_isolation.c b/mm/page_isolation.c
index 43e085608846..ce323e56b34d 100644
--- a/mm/page_isolation.c
+++ b/mm/page_isolation.c
@@ -15,8 +15,7 @@
#define CREATE_TRACE_POINTS
#include <trace/events/page_isolation.h>
-static int set_migratetype_isolate(struct page *page, int migratetype,
- bool skip_hwpoisoned_pages)
+static int set_migratetype_isolate(struct page *page, int migratetype, int isol_flags)
{
struct zone *zone;
unsigned long flags, pfn;
@@ -60,8 +59,7 @@ static int set_migratetype_isolate(struct page *page, int migratetype,
* FIXME: Now, memory hotplug doesn't call shrink_slab() by itself.
* We just check MOVABLE pages.
*/
- if (!has_unmovable_pages(zone, page, arg.pages_found, migratetype,
- skip_hwpoisoned_pages))
+ if (!has_unmovable_pages(zone, page, arg.pages_found, migratetype, flags))
ret = 0;
/*
@@ -185,7 +183,7 @@ __first_valid_page(unsigned long pfn, unsigned long nr_pages)
* prevents two threads from simultaneously working on overlapping ranges.
*/
int start_isolate_page_range(unsigned long start_pfn, unsigned long end_pfn,
- unsigned migratetype, bool skip_hwpoisoned_pages)
+ unsigned migratetype, int flags)
{
unsigned long pfn;
unsigned long undo_pfn;
@@ -199,7 +197,7 @@ int start_isolate_page_range(unsigned long start_pfn, unsigned long end_pfn,
pfn += pageblock_nr_pages) {
page = __first_valid_page(pfn, pageblock_nr_pages);
if (page &&
- set_migratetype_isolate(page, migratetype, skip_hwpoisoned_pages)) {
+ set_migratetype_isolate(page, migratetype, flags)) {
undo_pfn = pfn;
goto undo;
}