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When 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 simply falls back to the original method that using cma_mutex to make alloc_contig_range() run sequentially to avoid the issue. Cc: Andrew Morton Cc: Marek Szyprowski Cc: Lecopzer Chen Cc: David Hildenbrand Cc: Vlastimil Babka Cc: Minchan Kim CC: stable@vger.kernel.org # 5.11+ Fixes: a4efc174b382 ("mm/cma.c: remove redundant cma_mutex lock") Signed-off-by: Dong Aisheng Acked-by: Minchan Kim Acked-by: David Hildenbrand --- Patch is based on git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-stable --- mm/cma.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/mm/cma.c b/mm/cma.c index eaa4b5c920a2..4a978e09547a 100644 --- a/mm/cma.c +++ b/mm/cma.c @@ -37,6 +37,7 @@ struct cma cma_areas[MAX_CMA_AREAS]; unsigned cma_area_count; +static DEFINE_MUTEX(cma_mutex); phys_addr_t cma_get_base(const struct cma *cma) { @@ -468,9 +469,10 @@ struct page *cma_alloc(struct cma *cma, unsigned long count, spin_unlock_irq(&cma->lock); pfn = cma->base_pfn + (bitmap_no << cma->order_per_bit); + mutex_lock(&cma_mutex); ret = alloc_contig_range(pfn, pfn + count, MIGRATE_CMA, GFP_KERNEL | (no_warn ? __GFP_NOWARN : 0)); - + mutex_unlock(&cma_mutex); if (ret == 0) { page = pfn_to_page(pfn); break;