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Fri, 31 Jul 2026 23:57:55 -0700 (PDT) Date: Sat, 1 Aug 2026 02:57:51 -0400 From: Johannes Weiner To: Zi Yan Cc: Andrew Morton , Matthew Wilcox , William Kucharski , David Hildenbrand , Lorenzo Stoakes , Baolin Wang , "Liam R. Howlett" , Nico Pache , Ryan Roberts , Dev Jain , Barry Song , Lance Yang , Usama Arif , linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org Subject: Re: [PATCH v2 1/2] mm/huge_memory: use folio's memcg inside __folio_split() Message-ID: References: <20260730-add-gfp_account-to-xas_split_alloc-v2-0-5a56c2361d85@nvidia.com> <20260730-add-gfp_account-to-xas_split_alloc-v2-1-5a56c2361d85@nvidia.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260730-add-gfp_account-to-xas_split_alloc-v2-1-5a56c2361d85@nvidia.com> X-Stat-Signature: kdgrszcnoa9g6cak4jkszbpdaxp5dk5h X-Rspamd-Server: rspam07 X-Rspamd-Queue-Id: 8ED7720008 X-Rspam-User: X-HE-Tag: 1785567477-781619 X-HE-Meta: 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 rFLqZbq/ 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 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Thu, Jul 30, 2026 at 10:18:00PM -0400, Zi Yan wrote: > During a pagecache folio split, an xarray node allocation can happen and > needs to charge at folio's memcg instead of folio split invoker's memcg, > because for example folio split can happen during reclaim and reclaim's > active memcg might not be folio's memcg. Switch to folio's memcg at the > beginning and switch back afterwards. > > Suggested-by: Johannes Weiner > Fixes: 6b24ca4a1a8d4 ("mm: Use multi-index entries in the page cache") > Signed-off-by: Zi Yan Acked-by: Johannes Weiner