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[2003:d8:2f3c:3f00:7177:eb0c:d3d2:4b0e]) by smtp.gmail.com with ESMTPSA id bv14-20020a0560001f0e00b0033b784c2775sm8751825wrb.43.2024.02.13.14.48.42 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 13 Feb 2024 14:48:44 -0800 (PST) Message-ID: Date: Tue, 13 Feb 2024 23:48:41 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v3 00/35] Memory allocation profiling To: Suren Baghdasaryan Cc: Kent Overstreet , Michal Hocko , akpm@linux-foundation.org, vbabka@suse.cz, hannes@cmpxchg.org, roman.gushchin@linux.dev, mgorman@suse.de, dave@stgolabs.net, willy@infradead.org, liam.howlett@oracle.com, corbet@lwn.net, void@manifault.com, peterz@infradead.org, juri.lelli@redhat.com, catalin.marinas@arm.com, will@kernel.org, arnd@arndb.de, tglx@linutronix.de, mingo@redhat.com, dave.hansen@linux.intel.com, x86@kernel.org, peterx@redhat.com, axboe@kernel.dk, mcgrof@kernel.org, masahiroy@kernel.org, nathan@kernel.org, dennis@kernel.org, tj@kernel.org, muchun.song@linux.dev, rppt@kernel.org, paulmck@kernel.org, pasha.tatashin@soleen.com, yosryahmed@google.com, yuzhao@google.com, dhowells@redhat.com, hughd@google.com, andreyknvl@gmail.com, keescook@chromium.org, ndesaulniers@google.com, vvvvvv@google.com, gregkh@linuxfoundation.org, ebiggers@google.com, ytcoode@gmail.com, vincent.guittot@linaro.org, dietmar.eggemann@arm.com, rostedt@goodmis.org, bsegall@google.com, bristot@redhat.com, vschneid@redhat.com, cl@linux.com, penberg@kernel.org, iamjoonsoo.kim@lge.com, 42.hyeyoo@gmail.com, glider@google.com, elver@google.com, dvyukov@google.com, shakeelb@google.com, songmuchun@bytedance.com, jbaron@akamai.com, rientjes@google.com, minchan@google.com, kaleshsingh@google.com, kernel-team@android.com, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, iommu@lists.linux.dev, linux-arch@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, linux-modules@vger.kernel.org, kasan-dev@googlegroups.com, cgroups@vger.kernel.org References: <20240212213922.783301-1-surenb@google.com> <9e14adec-2842-458d-8a58-af6a2d18d823@redhat.com> <2hphuyx2dnqsj3hnzyifp5yqn2hpgfjuhfu635dzgofr5mst27@4a5dixtcuxyi> <6a0f5d8b-9c67-43f6-b25e-2240171265be@redhat.com> From: David Hildenbrand Autocrypt: addr=david@redhat.com; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-Rspamd-Queue-Id: 6279A180003 X-Rspam-User: X-Rspamd-Server: rspam02 X-Stat-Signature: ntnytswedy45hg3kfn89mcpgkazpp7e7 X-HE-Tag: 1707864529-952568 X-HE-Meta: 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 xEWmqKeq 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 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 13.02.24 23:30, Suren Baghdasaryan wrote: > On Tue, Feb 13, 2024 at 2:17 PM David Hildenbrand wrote: >> >> On 13.02.24 23:09, Kent Overstreet wrote: >>> On Tue, Feb 13, 2024 at 11:04:58PM +0100, David Hildenbrand wrote: >>>> On 13.02.24 22:58, Suren Baghdasaryan wrote: >>>>> On Tue, Feb 13, 2024 at 4:24 AM Michal Hocko wrote: >>>>>> >>>>>> On Mon 12-02-24 13:38:46, Suren Baghdasaryan wrote: >>>>>> [...] >>>>>>> We're aiming to get this in the next merge window, for 6.9. The feedback >>>>>>> we've gotten has been that even out of tree this patchset has already >>>>>>> been useful, and there's a significant amount of other work gated on the >>>>>>> code tagging functionality included in this patchset [2]. >>>>>> >>>>>> I suspect it will not come as a surprise that I really dislike the >>>>>> implementation proposed here. I will not repeat my arguments, I have >>>>>> done so on several occasions already. >>>>>> >>>>>> Anyway, I didn't go as far as to nak it even though I _strongly_ believe >>>>>> this debugging feature will add a maintenance overhead for a very long >>>>>> time. I can live with all the downsides of the proposed implementation >>>>>> _as long as_ there is a wider agreement from the MM community as this is >>>>>> where the maintenance cost will be payed. So far I have not seen (m)any >>>>>> acks by MM developers so aiming into the next merge window is more than >>>>>> little rushed. >>>>> >>>>> We tried other previously proposed approaches and all have their >>>>> downsides without making maintenance much easier. Your position is >>>>> understandable and I think it's fair. Let's see if others see more >>>>> benefit than cost here. >>>> >>>> Would it make sense to discuss that at LSF/MM once again, especially >>>> covering why proposed alternatives did not work out? LSF/MM is not "too far" >>>> away (May). >>>> >>>> I recall that the last LSF/MM session on this topic was a bit unfortunate >>>> (IMHO not as productive as it could have been). Maybe we can finally reach a >>>> consensus on this. >>> >>> I'd rather not delay for more bikeshedding. Before agreeing to LSF I'd >>> need to see a serious proposl - what we had at the last LSF was people >>> jumping in with half baked alternative proposals that very much hadn't >>> been thought through, and I see no need to repeat that. >>> >>> Like I mentioned, there's other work gated on this patchset; if people >>> want to hold this up for more discussion they better be putting forth >>> something to discuss. >> >> I'm thinking of ways on how to achieve Michal's request: "as long as >> there is a wider agreement from the MM community". If we can achieve >> that without LSF, great! (a bi-weekly MM meeting might also be an option) > > There will be a maintenance burden even with the cleanest proposed > approach. Yes. > We worked hard to make the patchset as clean as possible and > if benefits still don't outweigh the maintenance cost then we should > probably stop trying. Indeed. > At LSF/MM I would rather discuss functonal > issues/requirements/improvements than alternative approaches to > instrument allocators. > I'm happy to arrange a separate meeting with MM folks if that would > help to progress on the cost/benefit decision. Note that I am only proposing ways forward. If you think you can easily achieve what Michal requested without all that, good. My past experience was that LSF/MM / bi-weekly MM meetings were extremely helpful to reach consensus. -- Cheers, David / dhildenb