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Howlett" , Nico Pache , Ryan Roberts , Dev Jain , Barry Song , Lance Yang , Meta kernel team , linux-mm@kvack.org, cgroups@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH] mm: khugepaged: fix NR_FILE_PAGES accounting in collapse_file() Message-ID: References: <20260129184054.910897-1-shakeel.butt@linux.dev> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260129184054.910897-1-shakeel.butt@linux.dev> On Thu, Jan 29, 2026 at 10:40:54AM -0800, Shakeel Butt wrote: > @@ -2200,8 +2200,8 @@ static enum scan_result collapse_file(struct mm_struct *mm, unsigned long addr, > else > lruvec_stat_mod_folio(new_folio, NR_FILE_THPS, HPAGE_PMD_NR); > > + lruvec_stat_mod_folio(new_folio, NR_FILE_PAGES, HPAGE_PMD_NR); The memcg breakage is more visible, but I think this has been broken for NUMA stats even longer. new_folio could also come from a different node than the subpages, after all. > if (nr_none) { > - lruvec_stat_mod_folio(new_folio, NR_FILE_PAGES, nr_none); > /* nr_none is always 0 for non-shmem. */ > lruvec_stat_mod_folio(new_folio, NR_SHMEM, nr_none); So AFAICT NR_SHMEM needs the same treatment. It looks like that's been broken since f3f0e1d2150b ("khugepaged: add support of collapse for tmpfs/shmem pages"). Anon pages avoided this, because their accounting is done in rmap.c when the pmd is mapped and the ptes zapped.