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Shutemov" , Roman Gushchin , linux-mm@kvack.org, cgroups@vger.kernel.org, linux-kernel@vger.kernel.org, kernel-team@fb.com Subject: Re: [PATCH 01/19] mm: fix NUMA node file count error in replace_page_cache() Message-ID: <20200518111850.GA107644@dev-dsk-sblbir-1c-a524888b.ap-northeast-1.amazon.com> References: <20200508183105.225460-1-hannes@cmpxchg.org> <20200508183105.225460-2-hannes@cmpxchg.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20200508183105.225460-2-hannes@cmpxchg.org> X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Fri, May 08, 2020 at 02:30:48PM -0400, Johannes Weiner wrote: > When replacing one page with another one in the cache, we have to > decrease the file count of the old page's NUMA node and increase the > one of the new NUMA node, otherwise the old node leaks the count and > the new node eventually underflows its counter. > > Fixes: 74d609585d8b ("page cache: Add and replace pages using the XArray") > Signed-off-by: Johannes Weiner > Reviewed-by: Alex Shi > Reviewed-by: Shakeel Butt > Reviewed-by: Joonsoo Kim > --- > mm/filemap.c | 4 ++-- > 1 file changed, 2 insertions(+), 2 deletions(-) > > diff --git a/mm/filemap.c b/mm/filemap.c > index af1c6adad5bd..2b057b0aa882 100644 > --- a/mm/filemap.c > +++ b/mm/filemap.c > @@ -808,11 +808,11 @@ int replace_page_cache_page(struct page *old, struct page *new, gfp_t gfp_mask) > old->mapping = NULL; > /* hugetlb pages do not participate in page cache accounting. */ > if (!PageHuge(old)) > - __dec_node_page_state(new, NR_FILE_PAGES); > + __dec_node_page_state(old, NR_FILE_PAGES); > if (!PageHuge(new)) > __inc_node_page_state(new, NR_FILE_PAGES); > if (PageSwapBacked(old)) > - __dec_node_page_state(new, NR_SHMEM); > + __dec_node_page_state(old, NR_SHMEM); > if (PageSwapBacked(new)) > __inc_node_page_state(new, NR_SHMEM); > xas_unlock_irqrestore(&xas, flags); Reviewed-by: Balbir Singh