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Thu, 3 Sep 2026 21:29:47 +0800 (CST) Received: from kwepemk300003.china.huawei.com (unknown [7.202.195.93]) by mail.maildlp.com (Postfix) with ESMTPS id 53ED640586; Thu, 3 Sep 2026 21:41:00 +0800 (CST) Received: from [10.174.177.243] (10.174.177.243) by kwepemk300003.china.huawei.com (7.202.195.93) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.2562.45; Thu, 3 Sep 2026 21:40:59 +0800 Message-ID: Date: Thu, 3 Sep 2026 21:40:57 +0800 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 0/4] mm: replace PF_KCOMPACTD/PF_KSWAPD with kthread_func() To: Andrew Morton CC: , , , , , , , , , , , , , , , References: <20260902131653.1338227-1-wangkefeng.wang@huawei.com> <20260902134417.c44503a1d65533f81fb1c391@linux-foundation.org> Content-Language: en-US From: Kefeng Wang In-Reply-To: <20260902134417.c44503a1d65533f81fb1c391@linux-foundation.org> Content-Type: text/plain; charset="UTF-8"; format=flowed Content-Transfer-Encoding: 7bit X-Originating-IP: [10.174.177.243] X-ClientProxiedBy: kwepems100001.china.huawei.com (7.221.188.238) To kwepemk300003.china.huawei.com (7.202.195.93) X-Rspam-User: X-Rspamd-Server: rspam07 X-Rspamd-Queue-Id: 169F718000E X-Stat-Signature: mcpg3gbszox4qa95a15pr1mycw87yb77 X-HE-Tag: 1788442863-453354 X-HE-Meta: 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 eKsDDFmn v9K/cekwY8fHRZXIn1IVJ8u3Z9oA+3zl6Al5lHRWkvDobOn9ODjyXrTNwcJHxbu1k1Ev3GqDgFvo8Mi4SpySNofUmPbGOO3W6hzAwb+Qs2xDLMGkenn40v/mk5JzseCBRFVS4mIFkw8rybe37chLYMk3Yc+ltZtpQJOfUzkmjopOZZ9Zj5DqPN4DZSAiJ0kyYipRLyzzkDc1g4YcLNU0GtTxvJiNRklXFBioNmmYPyWyc1Jp9EtDqrksCv8HteGyVj2+yYIdDTjO+Bsu96nUke3NxPMYh6h1KS9XchbFa+8sth3IGDUw5OoC/mugPhxjBpEhiyopM3yYMbtSmxIMPjNpvDz/CbyY0U649zCwYdq8S5AUKfJUH+V5R2k8a+8NMbSd13rKYVGZcDkxszFmpU7m+VllLeHc8bG7oyZiRJYVsQgbdZ2tT0xhzOrpxQp6lQV1G Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 9/3/2026 4:44 AM, Andrew Morton wrote: > On Wed, 2 Sep 2026 21:16:49 +0800 Kefeng Wang wrote: > >> The task_struct->flags field is a limited 32-bit resource. Two flag bits, >> PF_KCOMPACTD and PF_KSWAPD, are used to identify whether a kernel thread >> is kcompactd or kswapd. Converting these to use kthread_func() frees up >> two valuable flag bits for future use. > > Well that was popular. > > Sashiko might have found a problem in the existing XFS code: > > https://sashiko.dev/#/patchset/20260902131653.1338227-1-wangkefeng.wang@huawei.com > Sashiko looks correct, I sent a fix patch, hoping it will work properly.