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d=icloud.com; s=1a1hai; t=1773068204; x=1775660204; bh=GOhN+p1crgw6WeP0xjnqp4QlR5PHq6mVgxA3ESYwIB8=; h=Message-ID:Date:MIME-Version:To:Subject:From:Content-Type:x-icloud-hme; b=Ft8dy1hdtfRvLHidYhB5tx4+gShDxqSwbmtl0qJod+n0yanjsOLOaY6msHIpZCWOao7mxg9c5K5Hl7ctgugL9OAuRtf4o4bvTfgKUJZKQmRO2cjbn5JngsxRgxAbCx0KBlJWXysoz64eeGN//+RJqt2bxQEtHrKOKeVZIhPvimU3ElkCM5+vjj5hV9FeE+bOGrYTahN8bBnj/GNM0V5Zw/+9LDC3qDn+iThSswrMWu8bppoeRqJr10qnk9hNq0hWGNXYjKR7ZKt2Pv6ut21Cp6OCSWeNx1X6Ffm2Eom+0FdpEuFYNJybE1yadJZ0TBiEa3QacBmX0AiEVBTjWjwNHA== Received: from [192.168.255.10] (unknown [17.42.251.67]) by p00-icloudmta-asmtp-us-east-1a-100-percent-10 (Postfix) with ESMTPSA id 6965D1800CA5; Mon, 9 Mar 2026 14:56:31 +0000 (UTC) Message-ID: Date: Mon, 9 Mar 2026 22:56:27 +0800 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird To: usama.arif@linux.dev Cc: Liam.Howlett@oracle.com, akpm@linux-foundation.org, axelrasmussen@google.com, bruzzhang@tencent.com, david@kernel.org, devnull+zippermonkey.icloud.com@kernel.org, hannes@cmpxchg.org, kasong@tencent.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org, ljs@kernel.org, mhocko@kernel.org, mhocko@suse.com, rppt@kernel.org, shakeel.butt@linux.dev, surenb@google.com, vbabka@kernel.org, weixugc@google.com, yuanchu@google.com, zhengqi.arch@bytedance.com References: <20260309122939.723610-1-usama.arif@linux.dev> Subject: Re: [PATCH 2/2] mm, vmscan: flush TLB for every 31 folios evictions From: Zhang Peng In-Reply-To: <20260309122939.723610-1-usama.arif@linux.dev> Content-Type: text/plain; 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You are right that the comment is wrong, page_ref_freeze does not exist in pageout_batch(). I will fix the comment in v2. Regarding the data corruption concern: try_to_unmap_flush_dirty() is called before pageout_one(), so all stale writable TLB entries are invalidated before IO starts. Any writes through stale TLB entries during the unlocked window will have completed and landed in physical memory before the flush, and will be correctly captured by the subsequent IO. pageout_batch() relocks each folio and rechecks its state (writeback, lru, mapped, dma_pinned) before proceeding. If any of these conditions have changed during the unlocked window, the folio is not written out and is put back to the LRU list for a future reclaim attempt. So there should be no data corruption issue. I will also add folio_maybe_dma_pinned() check in v2 as suggested by Kairui Song.