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[2003:d8:2f4e:3200:c99d:a38b:3f3a:d4b3]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-475caf2ef9fsm97056175e9.13.2025.10.24.08.32.52 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 24 Oct 2025 08:32:54 -0700 (PDT) Message-ID: <94d62ba4-e203-408e-9200-b153ce97555d@redhat.com> Date: Fri, 24 Oct 2025 17:32:52 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [RFC PATCH 0/5] BLOG: per-task logging contexts with Ceph consumer To: Alex Markuze , ceph-devel@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org Cc: Liam.Howlett@oracle.com, akpm@linux-foundation.org, bsegall@google.com, dietmar.eggemann@arm.com, idryomov@gmail.com, mingo@redhat.com, juri.lelli@redhat.com, kees@kernel.org, lorenzo.stoakes@oracle.com, mgorman@suse.de, mhocko@suse.com, rppt@kernel.org, peterz@infradead.org, rostedt@goodmis.org, surenb@google.com, vschneid@redhat.com, vincent.guittot@linaro.org, vbabka@suse.cz, xiubli@redhat.com, Slava.Dubeyko@ibm.com References: <20251024084259.2359693-1-amarkuze@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-Server: rspam10 X-Rspamd-Queue-Id: 5E884160016 X-Stat-Signature: 7rjnprf9pb77jpgfqee1iuikxmuzfdw5 X-Rspam-User: X-HE-Tag: 1761319978-165832 X-HE-Meta: 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 E4zoHTS0 w8xZRbUly6Dgm8pmTLloDp/q6mmXW6pcHplup7DI21FPnzYD669cBw+Scu2WN97TyZ4wdmqRidsxI/j8rLc6HT6Z9wu04pI5TUuSRdR90plNKIUzsZJHoUdo5fBvB91iK8qHOrLwY8AMiOZRPTmQNukzLTgK8JR/yRKxcHO1shREIArIlR1rqR3sSY75Qrl9AG15fdnAKVuI6NMqj18m/71DVYfwnrp0Z0fKGEgq7FOK3bIu1RUB2X2ypYmeRrB4rr/E+ZHqhq5sD6TXivfMDWpDF0vNF5Et2BNwdosp6MzFK0T56At+jkFHD2QPt2FpieAsqoV8i5kzJYiIIGlkAsLETR/JuCxDcmkfsQ2iS6IfVruO8jOBZKal9h++wd/3zxisSHPSX/eop7Q8gEn2QICbyu+JwhfeHDN0xATpXsO0XkQyquitvar9bEom1UHkl9PQajuK/EN3RyAE= 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 24.10.25 10:42, Alex Markuze wrote: > Motivation: improve observability in production by providing subsystemsawith > a logger that keeps up with their verbouse unstructured logs and aggregating > logs at the process context level, akin to userspace TLS. > > Binary LOGging (BLOG) introduces a task-local logging context: each context > owns a single 512 KiB fragment that cycles through “ready → in use → queued for > readers → reset → ready” without re-entering the allocator. Writers copy the > raw parameters they already have; readers format them later when the log is > inspected. > > BLOG borrows ideas from ftrace (captureabinary data now, format later) but > unlike ftrace there is no global ring. Each module registers its own logger, > manages its own buffers, and keeps the state small enough for production use. > > To host the per-module pointers we extend `struct task_struct` with one > additional `void *`, in line with other task extensions already in the kernel. > Each module keeps independent batches: `alloc_batch` for contexts with > refcount 0 and `log_batch` for contexts that have been filled and are waiting > for readers. The batching layer and buffer management were migrated from the > existing Ceph SAN logging code, so the behaviour is battle-tested; we simply > made the buffer inline so every composite stays within a single 512 KiB > allocation. > > The patch series lands the BLOG library first, then wires the task lifecycle, > and finally switches Ceph’s `bout*` logging macros to BLOG so we exercise the > new path. > > Patch summary: > 1. sched, fork: wire BLOG contexts into task lifecycle > - Adds `struct blog_tls_ctx *blog_contexts[BLOG_MAX_MODULES]` to > `struct task_struct`. > - Fork/exit paths initialise and recycle contexts automatically. > > 2. lib: introduce BLOG (Binary LOGging) subsystem > - Adds `lib/blog/` sources and headers under `include/linux/blog/`. > - Each composite (`struct blog_tls_pagefrag`) consists of the TLS > metadata, the pagefrag state, and an inline buffer sized at > `BLOG_PAGEFRAG_SIZE - sizeof(struct blog_tls_pagefrag)`. > > 3. ceph: add BLOG scaffolding > - Introduces `include/linux/ceph/ceph_blog.h` and `fs/ceph/blog_client.c`. > - Ceph registers a logger and maintains a client-ID map for the reader > callback. > > 4. ceph: add BLOG debugfs support > - Adds `fs/ceph/blog_debugfs.c` so filled contexts can be drained. > > 5. ceph: activate BLOG logging > - Switches `bout*` macros to BLOG, making Ceph the first consumer. Hi! You CCed plenty of MM folks, and I am sure most of them observe "this doesn't seem to touch any core-mm files" and wonder "what's hiding in there that requires a pair of MM eyes". Is there anything specific we should be looking at (and if so, in which patch)? -- Cheers David / dhildenb