The patch titled Subject: mm, page_frag: recover from memory pressure has been added to the -mm tree. Its filename is page_frag-recover-from-memory-pressure.patch

This patch should soon appear at https://ozlabs.org/~akpm/mmots/broken-out/page_frag-recover-from-memory-pres... and later at https://ozlabs.org/~akpm/mmotm/broken-out/page_frag-recover-from-memory-pres...

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------------------------------------------------------ From: Dongli Zhang dongli.zhang@oracle.com Subject: mm, page_frag: recover from memory pressure

The ethernet driver may allocate skb (and skb->data) via napi_alloc_skb(). This ends up to page_frag_alloc() to allocate skb->data from page_frag_cache->va.

During the memory pressure, page_frag_cache->va may be allocated as pfmemalloc page. As a result, the skb->pfmemalloc is always true as skb->data is from page_frag_cache->va. The skb will be dropped if the sock (receiver) does not have SOCK_MEMALLOC. This is expected behaviour under memory pressure.

However, once kernel is not under memory pressure any longer (suppose large amount of memory pages are just reclaimed), the page_frag_alloc() may still re-use the prior pfmemalloc page_frag_cache->va to allocate skb->data. As a result, the skb->pfmemalloc is always true unless page_frag_cache->va is re-allocated, even if the kernel is not under memory pressure any longer.

Here is how kernel runs into issue.

1. The kernel is under memory pressure and allocation of PAGE_FRAG_CACHE_MAX_ORDER in __page_frag_cache_refill() will fail. Instead, the pfmemalloc page is allocated for page_frag_cache->va.

2. All skb->data from page_frag_cache->va (pfmemalloc) will have skb->pfmemalloc=true. The skb will always be dropped by sock without SOCK_MEMALLOC. This is an expected behaviour.

3. Suppose a large amount of pages are reclaimed and kernel is not under memory pressure any longer. We expect skb->pfmemalloc drop will not happen.

4. Unfortunately, page_frag_alloc() does not proactively re-allocate page_frag_alloc->va and will always re-use the prior pfmemalloc page. The skb->pfmemalloc is always true even kernel is not under memory pressure any longer.

Fix this by freeing and re-allocating the page instead of recycling it.

Link: https://lore.kernel.org/lkml/20201103193239.1807-1-dongli.zhang@oracle.com/ Link: https://lore.kernel.org/linux-mm/20201105042140.5253-1-willy@infradead.org/ Link: https://lkml.kernel.org/r/20201115201029.11903-1-dongli.zhang@oracle.com Fixes: 79930f5892e ("net: do not deplete pfmemalloc reserve") Signed-off-by: Dongli Zhang dongli.zhang@oracle.com Suggested-by: Matthew Wilcox (Oracle) willy@infradead.org Acked-by: Vlastimil Babka vbabka@suse.cz Reviewed-by: Eric Dumazet edumazet@google.com Cc: Aruna Ramakrishna aruna.ramakrishna@oracle.com Cc: Bert Barbe bert.barbe@oracle.com Cc: Rama Nichanamatlu rama.nichanamatlu@oracle.com Cc: Venkat Venkatsubra venkat.x.venkatsubra@oracle.com Cc: Manjunath Patil manjunath.b.patil@oracle.com Cc: Joe Jin joe.jin@oracle.com Cc: SRINIVAS srinivas.eeda@oracle.com Cc: David S. Miller davem@davemloft.net Cc: stable@vger.kernel.org Signed-off-by: Andrew Morton akpm@linux-foundation.org ---

mm/page_alloc.c | 5 +++++ 1 file changed, 5 insertions(+)

--- a/mm/page_alloc.c~page_frag-recover-from-memory-pressure +++ a/mm/page_alloc.c @@ -5103,6 +5103,11 @@ refill: if (!page_ref_sub_and_test(page, nc->pagecnt_bias)) goto refill;

+ if (unlikely(nc->pfmemalloc)) { + free_the_page(page, compound_order(page)); + goto refill; + } + #if (PAGE_SIZE < PAGE_FRAG_CACHE_MAX_SIZE) /* if size can vary use size else just use PAGE_SIZE */ size = nc->size; _

Patches currently in -mm which might be from dongli.zhang@oracle.com are

page_frag-recover-from-memory-pressure.patch