From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.remote-ip=100.103.45.18 ARC-Seal: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=none; t=1792669719; b=q2oQTpeAiigv1ooBfnOgxOBuWPOlfNCvZtBqgbVlb278Hyipp9QPXbZztvXsj8QGHZ1q Ygwn2SF+gC3ku5UAsmHMJWhjRWPPG+xTzjTnvkPBtOoFOCcmK3Q7XEt9oMOapb3zhomms 0rEzWsyBBFkvebbz+gBykv0DVAFSSb+0nw1nsLNU8/0fnGpgjK0Oej30wRny6GdlOvCRi KRiVsLcOAEp+CzTB/rfKk73XdLfT4v19t3YkrBmTzOXEvanl+EdHbyLjbCRRI0y8zLP1r DE/FH+9pdUOFgCQ7Jez60Jm0v3pE6Vah8uMvCVzDxjIAZc8O32lV+NrgWGLniSQgw+A== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1792669719; h=Received:DKIM-Signature:Message-ID:From:Subject:Reply-To:To:Cc: In-Reply-To:References:Content-Type:Content-Transfer-Encoding:Date; bh=eJNKescZXBo26KhwrkWxVPC43w5UAxNrIjM2H32oCv4=; b=g2CxgoOTLdBF3b9ZkZQFk4rBTPuiQD4TKWfOpUgwGFr24FrchAZeQyjrnzYFNCm1cQW4 +N8ZFP5dhxboOTFa23hzKB8mpngRHcTglhjd4TA+5lR0RQXerkvf7RK0kCfliOONsmed3 PArWYEEUrUSnoMeH1AnJaVX03jHIKrCoxBLej0K9TBqUJ3iKdleekX6pcbahgrw2DWmeH CBouzR4G/SF2wZbNqdSGoSpWQHGohDISR82B7FjIwLxmd4ur6xa8bf3YE3z4DEFGwkxuM u9zLJIzrVgZJUssQz6VLiyMMdO09qOTObeBCk3ZEe7DG6Nw7iDuvlzbdyoKIjoOQUqg== ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b=kSSfShkP; arc=none smtp.remote-ip=100.103.45.18 Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (prime256v1)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 3270F606A31B for ; Thu, 22 Oct 2026 11:48:39 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key, unprotected) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b=kSSfShkP Received: by smtp.kernel.org (Postfix) with ESMTPSA id AD1161F000C1; Thu, 22 Oct 2026 11:48:38 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1792669719; bh=eJNKescZXBo26KhwrkWxVPC43w5UAxNrIjM2H32oCv4=; h=From:Subject:Reply-To:To:Cc:In-Reply-To:References:Date; b=kSSfShkPrDhhIjP8DonOKDn1TJmrkH3CBnAF/xkP/i1Ln9qsyD2ndkATlvDjKqCxY 8s2Ghv1qyDO8rkwNSkGsOtWzGLsimtIkoQB3gSd/sKcQ/KnvIe5RB+3Ba1TDJxQXq/ ntmnJtfgJGeVDP7xo4Qc8Ll036a0rU2CZZJXg+J/NRelVVnMNR3/v98vgBKnTkHOHE i4GYv22glWMdrmGIZnAx8AsrFaTCxUtHviDX13YeaCC5SkCZLHklF11Y/1UD6z4gCC iik35EMQqKvIV8GrOIin+k/7MlR8czYBCfLEIy7s1TSGKbZcKTsovWH51ZksYE4FrA v0aalxK6DNCLw== Message-ID: From: sashiko-bot@kernel.org Subject: Re: [PATCH slab/for-next 09/14] iommu: specify SLAB_MAY_ACCOUNT for slab-backed page table caches Reply-To: sashiko-reviews@lists.linux.dev To: =?utf-8?b?SGFycnkgWW9vIChNZXRhKQ==?= Cc: linux-s390@vger.kernel.org, "Heiko Carstens" , "Vasily Gorbik" , "Alexander Gordeev" , "Christian Borntraeger" In-Reply-To: <20261021-memalloc-prof-dont-waste-slabobj-ext-metadata-v1-9-096800aa3330@kernel.org> References: <20261021-memalloc-prof-dont-waste-slabobj-ext-metadata-v1-0-096800aa3330@kernel.org> <20261021-memalloc-prof-dont-waste-slabobj-ext-metadata-v1-9-096800aa3330@kernel.org> Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Date: Thu, 22 Oct 2026 11:48:38 +0000 X-Mailing-List: linux-s390@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list > vfio, iommufd and vhost-vdpa call iommu_map() with GFP_KERNEL_ACCOUNT > and the gfp is passed down to the drivers' page table allocations. > Specify SLAB_MAY_ACCOUNT when the object may be charged to a memcg. > __GFP_ACCOUNT without SLAB_MAY_ACCOUNT will not be allowed. >=20 > Paths: > VFIO_IOMMU_MAP_DMA -> iommu_map(GFP_KERNEL_ACCOUNT) > -> s390_iommu_map_pages() -> dma_walk_cpu_trans() > -> kmem_cache_alloc(dma_{region,page}_table_cache) > iommu_map(GFP_KERNEL_ACCOUNT) -> arm_v7s_map_pages() > -> __arm_v7s_alloc_table() -> kmem_cache_zalloc(data->l2_tables) > iommu_map(GFP_KERNEL_ACCOUNT) -> sun50i_iommu_map() > -> sun50i_dte_get_page_table() -> kmem_cache_zalloc(iommu->pt_pool) >=20 > Assisted-by: LLM > Cc: Will Deacon > Cc: Robin Murphy > Cc: "Joerg Roedel (AMD)" > Cc: Niklas Schnelle > Cc: Matthew Rosato > Cc: Gerald Schaefer > Cc: Chen-Yu Tsai > Cc: Jernej Skrabec > Cc: Samuel Holland > Cc: linux-arm-kernel@lists.infradead.org > Cc: iommu@lists.linux.dev > Cc: linux-s390@vger.kernel.org > Cc: linux-sunxi@lists.linux.dev > Signed-off-by: Harry Yoo (Meta) Sashiko has reviewed this patch and found no issues. --=20 Sashiko AI review =C2=B7 https://sashiko.dev/#/patchset/20261021-memalloc-p= rof-dont-waste-slabobj-ext-metadata-v1-0-096800aa3330@kernel.org?part=3D9