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Tue, 22 Oct 2024 06:06:27 -0400 (EDT) Date: Tue, 22 Oct 2024 13:06:22 +0300 From: "Kirill A. Shutemov" To: Baolin Wang Cc: Matthew Wilcox , akpm@linux-foundation.org, hughd@google.com, david@redhat.com, wangkefeng.wang@huawei.com, 21cnbao@gmail.com, ryan.roberts@arm.com, ioworker0@gmail.com, da.gomez@samsung.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org, "Kirill A . Shutemov" Subject: Re: [RFC PATCH v3 0/4] Support large folios for tmpfs Message-ID: <5p22lehyjjzxvohppdmt2vkkplrrd6ss6tev2px6troxyii4ab@eaphjvxiwrfc> References: <6dohx7zna7x6hxzo4cwnwarep3a7rohx4qxubds3uujfb7gp3c@2xaubczl2n6d> <8e48cf24-83e1-486e-b89c-41edb7eeff3e@linux.alibaba.com> <2c6b7456-8846-44b0-8e58-158c480aaead@linux.alibaba.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <2c6b7456-8846-44b0-8e58-158c480aaead@linux.alibaba.com> X-Rspamd-Server: rspam06 X-Rspamd-Queue-Id: A72A118001D X-Stat-Signature: qpq9f3oiocjccfy73fnqcwrjbog5dsb1 X-Rspam-User: X-HE-Tag: 1729591591-794417 X-HE-Meta: U2FsdGVkX1/HnNWBmvi8ddGIByimXU13kXJR0crzkI5bxU3yQCcp6i9BL7Oj/9N7ozF9diwiHABPmWNPscHyzR2RjngAND3ph4yCTob7pFMQhIVi55v+OljfB6Ur/c086AnsM2kX8qZxkcUK8SNVA0wr72mOwGhntXN8fxfVqwiH9Vu3VYk5GoBPY8fPNgSHhsTm0qodIr2ewJv0bQiRMANstTHwJ/PckI1QO3K63ZsNrAyZF7kXIt4pnZV3zy0HROzDNGXiCB1bTgn15uOllL59SY6NCMnB4pKl6QvG5Bx7vBjVVgCHheMS0CBQ3w9rWwblb0nkCAforASwczL0JvTaPrzZqqdkIJgKIbkckvyPfPym30LEG112MRXbC47CZXP+VFuEd/kPbuQbXXwxjiiPSiosqhMHHRxkjvRMhY61gbzLgqCR4hGG2MXHCM9NhMyzx28WpE2c3XzZ6I2LAWS5yG7tNdgQot+MCwXQGG1x6o694V6XY5QTeEUHZu4NgHERCKWE3zsjrLzozkDFKSbdW5TCScCGx7cUWW19LzsKhQ+GIikQIOzkKy2LmjaiDeeirtQJ4t9Riakc7RpoMtbhvYGx9zovLhO/IidqlL08C8LVbd+zd1Mhrz/TEKip+1gJAEYlWpumUJ+dbhU1hng+ZBa5W7qKtYpzt/NUYHFlaU2DElK377cKJgtbfc52LgDcDy1dti/jjajCMLbgLndy1jRhZD7rxK3XjK+TS5ze3DqedpxXgCNKF7O2mUYHvxRniRArlB8vmEdYLCRsKOwuB3GmD6AhNZcGDDpAQwbGR4BuHgU3H5JkQ125tMLYK6RpM1YRQSgyVyNefB30OvmaQYiklbBG3H20kpRxJg/VZYR9F+00OFMMYnYBe5pixPEbm57rJYY0Vd9P//rx8Vw8ZFGsVoEIZlG0plKZwHop5uExU5mIIzVByZjgjugWTFVlRdOZxQCXUVqqlYJ Ctq3fn5d +yqAxGLWVA1L8gQTBb7fpKx70K/8+L3Rzj769ZUs7cQcszJcFOJEnuAzawBIIUThoVT/sPCSXiSOovelDNvwh4+4ZKF/0Fjg9NHjIOqFGurWg1ugbeKkhbyJMZrGq2UH/nAT41guM2N5qlBqAghqbTibqxIAi4wxIPcR0E6Ci6zzZnTLBltHxc76IkzyITugcyTeRU8sp2Xv6xLLILd1p66xpI/l0ybGVD3Sh2M2Pn9TDeeFyzCQPOzEqWDyOxQ+nacPwnBPVgjFqZXwcJufgmdNBJ94oAmsHgcKxMPm7l0ScXPf5Rn37JPHXyfnwwh4zyE+ZhmgBOJWLroj77w0kmfxrlbHfPbEQtRORtVxvmvpCBXFFTNQsqKGOH/3DZkwjl+2muueeLBIbEIdhZlcXj+XYdA== 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 Tue, Oct 22, 2024 at 11:34:14AM +0800, Baolin Wang wrote: > IIUC, most file systems use method similar to iomap buffered IO (see > iomap_get_folio()) to allocate huge pages. What I mean is that, it would be > better to have a real use case to add a hint for allocating THP (other than > tmpfs). I would be nice to hear from folks who works with production what the actual needs are. But I find asymmetry between MADV_ hints and FADV_ hints wrt huge pages not justified. I think it would be easy to find use-cases for FADV_HUGEPAGE/FADV_NOHUGEPAGE. Furthermore I think it would be useful to have some kind of mechanism to make these hints persistent: any open of a file would have these hints set by default based on inode metadata on backing storage. Although, I am not sure what the right way to archive that. xattrs? -- Kiryl Shutsemau / Kirill A. Shutemov