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From: Shakeel Butt To: Joanne Koong Cc: miklos@szeredi.hu, linux-fsdevel@vger.kernel.org, jefflexu@linux.alibaba.com, josef@toxicpanda.com, linux-mm@kvack.org, bernd.schubert@fastmail.fm, kernel-team@meta.com Subject: Re: [PATCH v5 4/5] mm/migrate: skip migrating folios under writeback with AS_WRITEBACK_INDETERMINATE mappings Message-ID: References: <20241115224459.427610-1-joannelkoong@gmail.com> <20241115224459.427610-5-joannelkoong@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20241115224459.427610-5-joannelkoong@gmail.com> X-Migadu-Flow: FLOW_OUT X-Stat-Signature: hqx477mspydo49f87jnkfkpqdmc54pey X-Rspamd-Queue-Id: DDE0D1A000E X-Rspamd-Server: rspam08 X-Rspam-User: X-HE-Tag: 1731712279-609061 X-HE-Meta: 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 4VUpKdZn EUT92G0p3V6UJcyQZOKwnuu5YVyd20Kfu3S5xvk3Qw48h41rs5P0rcmsMW5sxKxqRr9/PwnCizcs9gcI3H+YC/BkhHDVfeK68Nm3xUbldMu7pVOpDcciwrqThvvz2xwotSFZdqj2DTIysCWkmufA3JqKtOrk64/qwW7TZrzsEsHvjSMYBoA+SXaaZ3KvScLuC/hS3/vyabQTNely5X78kEt+QgA== X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Fri, Nov 15, 2024 at 02:44:58PM -0800, Joanne Koong wrote: > For migrations called in MIGRATE_SYNC mode, skip migrating the folio if > it is under writeback and has the AS_WRITEBACK_INDETERMINATE flag set on its > mapping. If the AS_WRITEBACK_INDETERMINATE flag is set on the mapping, the > writeback may take an indeterminate amount of time to complete, and > waits may get stuck. > > Signed-off-by: Joanne Koong Reviewed-by: Shakeel Butt