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Howlett" To: Lorenzo Stoakes Cc: Kalesh Singh , Andrew Morton , vbabka@suse.cz, yang@os.amperecomputing.com, riel@surriel.com, david@redhat.com, minchan@kernel.org, jyescas@google.com, linux@armlinux.org.uk, tsbogend@alpha.franken.de, James.Bottomley@hansenpartnership.com, ysato@users.sourceforge.jp, dalias@libc.org, glaubitz@physik.fu-berlin.de, davem@davemloft.net, andreas@gaisler.com, tglx@linutronix.de, bp@alien8.de, dave.hansen@linux.intel.com, x86@kernel.org, chris@zankel.net, jcmvbkbc@gmail.com, bhelgaas@google.com, jason.andryuk@amd.com, leitao@debian.org, linux-alpha@vger.kernel.org, linux-kernel@vger.kernel.org, linux-snps-arc@lists.infradead.org, linux-arm-kernel@lists.infradead.org, linux-csky@vger.kernel.org, loongarch@lists.linux.dev, linux-mips@vger.kernel.org, linux-parisc@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-s390@vger.kernel.org, linux-sh@vger.kernel.org, sparclinux@vger.kernel.org, linux-mm@kvack.org, kernel-team@android.com, android-mm@google.com, Jann Horn Subject: Re: [PATCH mm-unstable v2 00/16] mm: Introduce arch_mmap_hint() Message-ID: Mail-Followup-To: "Liam R. Howlett" , Lorenzo Stoakes , Kalesh Singh , Andrew Morton , vbabka@suse.cz, yang@os.amperecomputing.com, riel@surriel.com, david@redhat.com, minchan@kernel.org, jyescas@google.com, linux@armlinux.org.uk, tsbogend@alpha.franken.de, James.Bottomley@hansenpartnership.com, ysato@users.sourceforge.jp, dalias@libc.org, glaubitz@physik.fu-berlin.de, davem@davemloft.net, andreas@gaisler.com, tglx@linutronix.de, bp@alien8.de, dave.hansen@linux.intel.com, x86@kernel.org, chris@zankel.net, jcmvbkbc@gmail.com, bhelgaas@google.com, jason.andryuk@amd.com, leitao@debian.org, linux-alpha@vger.kernel.org, linux-kernel@vger.kernel.org, linux-snps-arc@lists.infradead.org, linux-arm-kernel@lists.infradead.org, linux-csky@vger.kernel.org, loongarch@lists.linux.dev, linux-mips@vger.kernel.org, linux-parisc@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-s390@vger.kernel.org, linux-sh@vger.kernel.org, sparclinux@vger.kernel.org, linux-mm@kvack.org, kernel-team@android.com, android-mm@google.com, Jann 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 yQT/HkHd 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wrote: ... > > > > On the technical side, Liam is right that the copy-pasted arch code > > has inconsistencies (missing checks, order of checks, ...). I agree > > there=E2=80=99s room for further consolidation. I=E2=80=99ll take anoth= er stab at it > > and resend it as an RFC with an updated cover letter, as Lorenzo and > > others suggested. Thanks. Can you please include what platforms you have tested in your cover letter (and level of testing - booting, running something, etc). If you have not tested them, then it might be worth it to have it as an RFC to point this out - at least initially. Some of these are very difficult to set up for testing, but it is also possible that you did that and the maintainers/people who usually test these things will assume it's fine if you don't spell out what's going on. >=20 > The most useful thing here as well to help us understand would be to writ= e > more in the cover letter to expand on what it is you ultimately what to > achieve here - it seems like an extension on the existing THP work on a > per-arch basis (I may be wrong)? So adding more detail would be super > useful here! :) >=20 > We do hope to avoid arch hooks if at all possible explicitly for the reas= on > that they can be applied at unfortunate times in terms of locking/whether > the objects in question are fully/partially instantiated, VMA visibility > etc. etc. based on having had issues in these areas before. >=20 > Also if a hook means 'anything' can happen at a certain point, it means w= e > can't make any assumptions about what has/hasn't and have to account for > anything which seriously complicates things. >=20 > Ideally we'd find a means to achieve the same thing while also exposing u= s > as little as possible to what may be mutated. Yes, I'm not sure of what your plans are, but I would like to see all of these custom functions removed, if at all possible. Thanks, Liam