From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 550473B583C for ; Thu, 28 May 2026 17:59:24 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1779991165; cv=none; b=hxZ5N52yBiw5QYv7/uKjYabP4XsZnzkGP1nwpHqn1Ls3zy/BV2tL7QKDghqtlNG6oJdSl9MaZt2zBNB+wcMhIAUl3oQHyGR9DCKhgxF4a2Qv4M1wj4XdpUq1wp+J0k13H3SGzWS3Mftfr+5R4BkHOL96Pl9Yk1cjQSJB6PzVTzA= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1779991165; c=relaxed/simple; bh=nHE3rvmfw6ogAdKoQcmkAb7+EqT8LQ89hDPTJI6xhAQ=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=hwzWrHVepQj1E5gKcE8QDYwKQZhhBfIV8cvdcfMQTjBG84Rp6iWzouilOpcVMdDmFgolXSoeysA94CcNeUyVm4yW9Udc4YYVyGugzrotZUKwN4l4q2eVMfhSYU8eCebDzInolFXyhTpSN/QjTA35AYKVr5HYbXo+E/LIUsyNHiw= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=WABDmyaY; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="WABDmyaY" Received: by smtp.kernel.org (Postfix) with ESMTPSA id D1AB31F000E9; Thu, 28 May 2026 17:59:21 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1779991163; bh=lkmpRH9UNpSvrtaG0hoUp63QJw6OttsyKLxOKt4UekE=; h=Date:Subject:To:Cc:References:From:In-Reply-To; b=WABDmyaY4CmqSIRKitMqyYR4m7+sNSlgG7XnwB2ueRz+whknEeVOr93I+7N+OoMuI U0PvZATRvkrQNcdnXDsg6xaOq1Q4n1XppsNXR4+xUrgDmuUhdvZCpweNUHBe9X25WR mg8rTlHac60MKJPEQWNREo5vPGfap/q+8HnyV3+XzErx0kNbjJN3o9En6K7Hx4uZ6k gcFU+JJAv+gCFdZxftU53M2g+tCwIYQ3/wOr8f+nPIb2Ug6XFcfFgNIOd+2UKqFfLW zLazeHbFSrOWtZiZ3PBvOyGd4esgjgC6bJTlTKWRyHf1EqBkiyI9oGzoYLUkFonOOD KMTsXLHvz9jkg== Message-ID: <61a25965-cb89-4a6a-bd69-16a467ce84f2@kernel.org> Date: Thu, 28 May 2026 19:59:20 +0200 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v5] mm/slub: use empty sheaf helpers for oversized sheaves Content-Language: en-US To: hu.shengming@zte.com.cn, harry@kernel.org, akpm@linux-foundation.org Cc: hao.li@linux.dev, cl@gentwo.org, rientjes@google.com, roman.gushchin@linux.dev, linux-mm@kvack.org, linux-kernel@vger.kernel.org, zhang.run@zte.com.cn, cai.qu@zte.com.cn References: <20260528193537623nAo-xYBNYBysGKSBjREuO@zte.com.cn> From: "Vlastimil Babka (SUSE)" Autocrypt: addr=vbabka@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 7bit On 5/28/26 13:35, hu.shengming@zte.com.cn wrote: > From: Shengming Hu > > Oversized prefilled sheaves are allocated separately because their > capacity can be larger than the cache's regular sheaf capacity. After > they are flushed, however, they are empty sheaves as well, and should be > released through the same empty-sheaf helper. > > Allocate oversized prefilled sheaves with __alloc_empty_sheaf() and free > them with free_empty_sheaf() after a failed prefill or after they are > returned and flushed. This keeps the oversized and pfmemalloc return paths > consistent, including the SLAB_KMALLOC-specific __GFP_NO_OBJ_EXT and > mark_obj_codetag_empty() handling. > > Keep the caller-GFP filtering in alloc_empty_sheaf() instead of > __alloc_empty_sheaf(). In particular, do not clear OBJCGS_CLEAR_MASK in > the raw helper, so the oversized prefill path does not unexpectedly drop > caller-provided flags such as __GFP_NOFAIL. The SLAB_KMALLOC-specific > addition of __GFP_NO_OBJ_EXT remains in __alloc_empty_sheaf(), matching > the free_empty_sheaf() assumption. > > Since oversized sheaves are now allocated and freed through the empty > sheaf helpers, SHEAF_ALLOC and SHEAF_FREE also account for oversized > sheaves. Update the stat comments accordingly. > > Keep the capacity initialization in the oversized prefill path, since > capacity is currently only used for prefilled sheaves > > Signed-off-by: Shengming Hu Thanks! Applied to slab/for-next