From: Johannes Weiner <hannes@cmpxchg.org>
To: Zi Yan <ziy@nvidia.com>
Cc: Andrew Morton <akpm@linux-foundation.org>,
Matthew Wilcox <willy@infradead.org>,
William Kucharski <william.kucharski@oracle.com>,
David Hildenbrand <david@kernel.org>,
Lorenzo Stoakes <ljs@kernel.org>,
Baolin Wang <baolin.wang@linux.alibaba.com>,
"Liam R. Howlett" <liam@infradead.org>,
Nico Pache <nico.pache@linux.dev>,
Ryan Roberts <ryan.roberts@arm.com>, Dev Jain <dev.jain@arm.com>,
Barry Song <baohua@kernel.org>, Lance Yang <lance.yang@linux.dev>,
Usama Arif <usama.arif@linux.dev>,
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()
Date: Sat, 1 Aug 2026 02:57:51 -0400 [thread overview]
Message-ID: <am2Y78jxTQTlIPPe@cmpxchg.org> (raw)
In-Reply-To: <20260730-add-gfp_account-to-xas_split_alloc-v2-1-5a56c2361d85@nvidia.com>
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 <hannes@cmpxchg.org>
> Fixes: 6b24ca4a1a8d4 ("mm: Use multi-index entries in the page cache")
> Signed-off-by: Zi Yan <ziy@nvidia.com>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
next prev parent reply other threads:[~2026-08-01 6:58 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-07-31 2:17 [PATCH v2 0/2] Honor XA_FLAGS_ACCOUNT in xas_split_alloc() and charge to folio's memcg Zi Yan
2026-07-31 2:18 ` [PATCH v2 1/2] mm/huge_memory: use folio's memcg inside __folio_split() Zi Yan
2026-08-01 6:57 ` Johannes Weiner [this message]
2026-08-01 9:36 ` Lorenzo Stoakes (ARM)
2026-07-31 2:18 ` [PATCH v2 2/2] xarray: honor XA_FLAGS_ACCOUNT in xas_split_alloc() Zi Yan
2026-08-01 6:58 ` Johannes Weiner
2026-08-01 9:38 ` Lorenzo Stoakes (ARM)
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