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Received: from willy by casper.infradead.org with local (Exim 4.94.2 #2 (Red Hat Linux)) id 1pG4Ij-005SJn-OB; Thu, 12 Jan 2023 20:35:54 +0000 Date: Thu, 12 Jan 2023 20:35:53 +0000 From: Matthew Wilcox To: Steven Rostedt Cc: lsf-pc@lists.linux-foundation.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, bpf@vger.kernel.org, Joel Fernandes , Brian Norris , Ching-lin Yu Subject: Re: [LSF/MM/BPF TOPIC] tracing mapped pages for quicker boot performance Message-ID: References: <20230112132153.38d52708@gandalf.local.home> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20230112132153.38d52708@gandalf.local.home> X-Rspamd-Queue-Id: DF53940002 X-Rspamd-Server: rspam09 X-Rspam-User: X-Stat-Signature: bimcru1qrkwbxwqk7xhwrn8kyu9r9mem X-HE-Tag: 1673555747-707764 X-HE-Meta: U2FsdGVkX1/T4lgKQOZ4RCAAWQdxWq7Q4o6uMIlkBD8k6Zux5P6hErQ79mVZqnCYczOF9rf7IQgy9qn9HKWo7BPHHzmwXT5h7jYhECmi25b0bWKFnHsxw5vmLI9+5UCpcavtNXSpYh9Kufu2oDVeCI6GLOnyzTn0pQdsOpIOLBZdvAXFChtZoD/qIHwdgJgJxfI9dT3gdBgKhFobgYb8ykLMmZKt68VKIH5DrpwNdbM/DWyXUPDC49qpXgA4I3J0Md/vUgdESPEi5/PM8TqLJbAlrthmHVjGATvhMRjv/BFpQX/Fm0TiEkSbp7qLLvWqQkdvMvCxxmU1ZWTHeVlDNYTNCUGW3odUk8WqXOwuk/Qs+4eIjEfWrG2TeJky1awvEcM4GJyVzTRFhynheUrTOdiE2esxmUSVMJ7bmNBrH/GUA0FfFai55oHIMQRPRSnmoagsb8yhpEDLa3Kc8qIwLEXRWbzOTTEww+0nl4dKyCSlqyLkN1VyPHW0/sLkfq9ICjadf3lyn+dkpKqVcZiI57YTM/St9OUnmsrHgBIdLoxGs/kFJgPdzuBbN5mOAhiMt5pBNwxJHi/NUf9bqhrd2L+cv+MJ4Of5XOSsBB2Vhog/GH33WsZAy7GEgkYUmHim31VYHJOPTdHvwqb66rZ3gBvwGuJ+AX8YsZGbbYk1jsk30atPfjWOAFEJzWCjzZRnkLm5nC8642WSrJn7B48rQQTx0ZySN95kpdGTIw+xqjd5UQTDE/oPx5ureScRWOkYYqY/O52e3Xrl0b9QbbecJ6T4b2n8BU2XfwnPsszE7b265lGuH1h618DHqU2+tjk5gl6OJQKI4p7dZVqnNrlQAzvTdqACiUQm 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 Thu, Jan 12, 2023 at 01:21:53PM -0500, Steven Rostedt wrote: > What I would like to discuss, is if there could be a way to add some sort > of trace events that can tell an application exactly what pages in a file > are being read from disk, where there is no such races. Then an application > would simply have to read this information and store it, and then it can > use this information later to call readahead() on these locations of the > file so that they are available when needed. trace_mm_filemap_add_to_page_cache()?