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[91.12.103.71]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-37ee0a4b26dsm4625630f8f.45.2024.10.21.08.49.36 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 21 Oct 2024 08:49:37 -0700 (PDT) Message-ID: Date: Mon, 21 Oct 2024 17:49:35 +0200 Precedence: bulk X-Mailing-List: linux-arch@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v3 5/5] alloc_tag: config to store page allocation tag refs in page flags To: Suren Baghdasaryan , Michal Hocko Cc: John Hubbard , Yosry Ahmed , akpm@linux-foundation.org, kent.overstreet@linux.dev, corbet@lwn.net, arnd@arndb.de, mcgrof@kernel.org, rppt@kernel.org, paulmck@kernel.org, thuth@redhat.com, tglx@linutronix.de, bp@alien8.de, xiongwei.song@windriver.com, ardb@kernel.org, vbabka@suse.cz, hannes@cmpxchg.org, roman.gushchin@linux.dev, dave@stgolabs.net, willy@infradead.org, liam.howlett@oracle.com, pasha.tatashin@soleen.com, souravpanda@google.com, keescook@chromium.org, dennis@kernel.org, yuzhao@google.com, vvvvvv@google.com, rostedt@goodmis.org, iamjoonsoo.kim@lge.com, rientjes@google.com, minchan@google.com, kaleshsingh@google.com, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org, linux-mm@kvack.org, linux-modules@vger.kernel.org, kernel-team@android.com References: <9c81a8bb-18e5-4851-9925-769bf8535e46@redhat.com> <62a7eb3f-fb27-43f4-8365-0fa0456c2f01@redhat.com> From: David Hildenbrand Content-Language: en-US Autocrypt: addr=david@redhat.com; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit On 21.10.24 17:41, Suren Baghdasaryan wrote: > On Mon, Oct 21, 2024 at 8:34 AM Michal Hocko wrote: >> >> On Mon 21-10-24 08:05:16, Suren Baghdasaryan wrote: >> [...] >>> Yeah, I thought about adding new values to "mem_profiling" but it's a >>> bit complicated. Today it's a tristate: >>> >>> mem_profiling=0|1|never >>> >>> 0/1 means we disable/enable memory profiling by default but the user >>> can enable it at runtime using a sysctl. This means that we enable >>> page_ext at boot even when it's set to 0. >>> "never" means we do not enable page_ext, memory profiling is disabled >>> and sysctl to enable it will not be exposed. Used when a distribution >>> has CONFIG_MEM_ALLOC_PROFILING=y but the user does not use it and does >>> not want to waste memory on enabling page_ext. >>> >>> I can add another option like "pgflags" but then it also needs to >>> specify whether we should enable or disable profiling by default >>> (similar to 0|1 for page_ext mode). IOW we will need to encode also >>> the default state we want. Something like this: >>> >>> mem_profiling=0|1|never|pgflags_on|pgflags_off >>> >>> Would this be acceptable? >> >> Isn't this overcomplicating it? Why cannot you simply go with >> mem_profiling={0|never|1}[,$YOUR_OPTIONS] >> >> While $YOUR_OPTIONS could be compress,fallback,ponies and it would apply >> or just be ignored if that is not applicable. > > Oh, you mean having 2 parts in the parameter with supported options being: > > mem_profiling=never > mem_profiling=0 > mem_profiling=1 > mem_profiling=0,pgflags > mem_profiling=1,pgflags > That's also a viable solution indeed. -- Cheers, David / dhildenb