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Received: from willy by casper.infradead.org with local (Exim 4.94.2 #2 (Red Hat Linux)) id 1qb7eN-009FBY-V9; Tue, 29 Aug 2023 22:57:32 +0000 Date: Tue, 29 Aug 2023 23:57:31 +0100 From: Matthew Wilcox To: Linus Torvalds Cc: Andrew Morton , Stephen Rothwell , Guo Ren , linux-mm@kvack.org, mm-commits@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [GIT PULL] MM updates for 6.6-rc1 Message-ID: References: <20230828184251.bfbc164280503903eacf498c@linux-foundation.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-Rspamd-Queue-Id: 052A94001B X-Rspam-User: X-Stat-Signature: wg1i57784f56uqj1gdrnxadtm6c5roik X-Rspamd-Server: rspam01 X-HE-Tag: 1693349862-534078 X-HE-Meta: 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 PW5b/j++ 0FuAFWI7nMa+yL6Zvrx0Royx/tRCDl/iuOD/irZmZqFaAo7hg5uAfPkthHoGNHzbYrlYnx2LPkbs99OZtIjG1IB9Qg2G2NBmyR8tMfRM6VtXfEQIvzlOKdjjGZPlMggNAuatgvRvyOPofAV5O5nMmtnIsmymexT4twHYy9jH/AWqcRJr8UbZdrbOsemeALRAVSPhR5Gv3wIz9b4B5qimoZn2l2Zqh+TULmDh1gqdGmmnHQ79gYMV6oPyZexBGTI6jLvjVpfymyMu5appuhkb1u4dMiDtZ3/Ga3HUcDKMisX9AErv+3p96lR/F3Z0hIe2MnEdI 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: On Tue, Aug 29, 2023 at 02:31:38PM -0700, Linus Torvalds wrote: > On Mon, 28 Aug 2023 at 18:43, Andrew Morton wrote: > > > > csky tree, arch/csky/abiv2/cacheflush.c: > > https://lkml.kernel.org/r/20230815104604.54f65293@canb.auug.org.au > > At least this resolution in linux-next was wrong. It would just keep > on doing a cache invalidate on the same one-page address range over > and over again. > > I think I did it right, but obviously can't test (and am too lazy to > build-test too). > > Of course, it won't actually matter unless you have large folio on > csky, which is probably hard to impossible to trigger in practice, but > I thought I'd mention it if for no other reason than Guo Ren to be > aware and at least test-build and maybe think about it. As far as I can tell, csky doesn't enable support for HUGETLBFS nor for TRANSPARENT_HUGEPAGE and large folios are currently disabled unless you have TRANSPARENT_HUGEPAGE, simply because they rely on infrastructure that's only built for TRANSPARENT_HUGEPAGE. We should probably fix that at some point; allocating in larger chunks is beneficial even if you don't have PMD sized TLB entries. But the motivation to do that work has been lacking; there are plenty of more important projects in the queue.