When there're multiple process allocing dma memory in parallel
by calling dma_alloc_coherent(), it may fail sometimes as follows:
Error log:
cma: cma_alloc: linux,cma: alloc failed, req-size: 148 pages, ret: -16
cma: number of available pages:
3@125+20@172+12@236+4@380+32@736+17@2287+23@2473+20@36076+99@40477+108@40852+44@41108+20@41196+108@41364+108@41620+
108@42900+108@43156+483@44061+1763@45341+1440@47712+20@49324+20@49388+5076@49452+2304@55040+35@58141+20@58220+20@58284+
7188@58348+84@66220+7276@66452+227@74525+6371@75549=> 33161 free of 81920 total pages
When issue happened, we saw there were still 33161 pages (129M) free CMA
memory and a lot available free slots for 148 pages in CMA bitmap that we
want to allocate.
If dumping memory info, we found that there was also ~342M normal memory,
but only 1352K CMA memory left in buddy system while a lot of pageblocks
were isolated.
Memory info log:
Normal free:351096kB min:30000kB low:37500kB high:45000kB reserved_highatomic:0KB
active_anon:98060kB inactive_anon:98948kB active_file:60864kB inactive_file:31776kB
unevictable:0kB writepending:0kB present:1048576kB managed:1018328kB mlocked:0kB
bounce:0kB free_pcp:220kB local_pcp:192kB free_cma:1352kB lowmem_reserve[]: 0 0 0
Normal: 78*4kB (UECI) 1772*8kB (UMECI) 1335*16kB (UMECI) 360*32kB (UMECI) 65*64kB (UMCI)
36*128kB (UMECI) 16*256kB (UMCI) 6*512kB (EI) 8*1024kB (UEI) 4*2048kB (MI) 8*4096kB (EI)
8*8192kB (UI) 3*16384kB (EI) 8*32768kB (M) = 489288kB
The root cause of this issue is that since commit a4efc174b382
("mm/cma.c: remove redundant cma_mutex lock"), CMA supports concurrent
memory allocation. It's possible that the memory range process A trying
to alloc has already been isolated by the allocation of process B during
memory migration.
The problem here is that the memory range isolated during one allocation
by start_isolate_page_range() could be much bigger than the real size we
want to alloc due to the range is aligned to MAX_ORDER_NR_PAGES.
Taking an ARMv7 platform with 1G memory as an example, when MAX_ORDER_NR_PAGES
is big (e.g. 32M with max_order 14) and CMA memory is relatively small
(e.g. 128M), there're only 4 MAX_ORDER slot, then it's very easy that
all CMA memory may have already been isolated by other processes when
one trying to allocate memory using dma_alloc_coherent().
Since current CMA code will only scan one time of whole available CMA
memory, then dma_alloc_coherent() may easy fail due to contention with
other processes.
This patch introduces a retry mechanism to rescan CMA bitmap for -EBUSY
error in case the target memory range may has been temporarily isolated
by others and released later.
Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Cc: Marek Szyprowski <m.szyprowski@xxxxxxxxxxx>
Cc: Lecopzer Chen <lecopzer.chen@xxxxxxxxxxxx>
Cc: David Hildenbrand <david@xxxxxxxxxx>
Cc: Vlastimil Babka <vbabka@xxxxxxx>
CC: stable@xxxxxxxxxxxxxxx # 5.11+
Fixes: a4efc174b382 ("mm/cma.c: remove redundant cma_mutex lock")
Signed-off-by: Dong Aisheng <aisheng.dong@xxxxxxx>
---
ChangeLog:
* v2->v3: Improve commit messages
* v1->v2: no changes
---
mm/cma.c | 11 +++++++++++
1 file changed, 11 insertions(+)
diff --git a/mm/cma.c b/mm/cma.c
index eaa4b5c920a2..46a9fd9f92c4 100644
--- a/mm/cma.c
+++ b/mm/cma.c
@@ -430,6 +430,7 @@ struct page *cma_alloc(struct cma *cma, unsigned long count,
unsigned long i;
struct page *page = NULL;
int ret = -ENOMEM;
+ int loop = 0;
if (!cma || !cma->count || !cma->bitmap)
goto out;
@@ -457,6 +458,16 @@ struct page *cma_alloc(struct cma *cma, unsigned long count,
offset);
if (bitmap_no >= bitmap_maxno) {
spin_unlock_irq(&cma->lock);
+ pr_debug("%s(): alloc fail, retry loop %d\n", __func__, loop++);
+ /*
+ * rescan as others may finish the memory migration
+ * and quit if no available CMA memory found finally
+ */
+ if (start) {
+ schedule();
+ start = 0;
+ continue;
+ }
break;
}
bitmap_set(cma->bitmap, bitmap_no, bitmap_count);
--
2.25.1
