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Tue, 30 Jul 2024 06:37:00 -0400 (EDT) X-Mailer: MessagingEngine.com Webmail Interface MIME-Version: 1.0 Date: Tue, 30 Jul 2024 12:36:39 +0200 From: "Arnd Bergmann" To: "Linus Torvalds" , "Lorenzo Stoakes" Cc: "David Laight" , "linux-kernel@vger.kernel.org" , "Matthew Wilcox" , "Christoph Hellwig" , "Andrew Morton" , "Andy Shevchenko" , "Dan Carpenter" , "Jason A . Donenfeld" , "pedro.falcato@gmail.com" , "Mateusz Guzik" , "linux-mm@kvack.org" Message-Id: In-Reply-To: References: <23bdb6fc8d884ceebeb6e8b8653b8cfe@AcuMS.aculab.com> <902a9bf3-9404-44e8-9063-03da3168146a@lucifer.local> <137646a7-7017-490d-be78-5bd5627609c3@lucifer.local> <36aa2cad-1db1-4abf-8dd2-fb20484aabc3@lucifer.local> <2f1be7ee-2d70-4dd3-bfa2-1b94a4fc5a66@lucifer.local> Subject: Re: [PATCH 0/7] minmax: reduce compilation time Content-Type: text/plain Content-Transfer-Encoding: 7bit X-Rspamd-Server: rspam03 X-Rspam-User: X-Rspamd-Queue-Id: CC9BF120024 X-Stat-Signature: uu185co619duqd3pnc5be1c4rzjzzszo X-HE-Tag: 1722335822-736564 X-HE-Meta: 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 ENoUBBC2 KO0g244oh3W+yab/VD5+DDFRA/Yf05HcuwnLIuj227pi1/xO3LtfscZfeJYxeB3lz+tdyL+I6atNGrV9UQxthcdXVpKhSQjARbiefETTNvHLMF4q6XU9LBd+Yfn4bMJ0g4XeaUJ+UHItDsxl9Nr9YNL3EC0Voyp5rwQfWq/bY9EroEbf/WrPjy/a7nDIvBmTZdumhvrqYcAGKN/oSBvJy+fJYTJZIGLFSIR8CEmfWWLAyTxYmx7OQqdhhSyhxJ2O5rnoedTxbItVO3/5hUFkbJTBmIg== 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 Tue, Jul 30, 2024, at 06:10, Linus Torvalds wrote: > > Of course, I never did any build timings. I'm not sure how much it > actually shows up on that level. A couple of bad cases won't be *that* > noticeable when most cases aren't too horrid. I did a little bit of build timing last week, which confirms exactly what you expect here: On individual files, the difference can easily be 1000x faster, like on that arch/x86/xen/setup.c file, but overall the difference in build speed for an allmodconfig or defconfig build was between 1% and 3%, depending on how many of the extreme cases are included. Of course, it would be easy to take one of the extreme cases and add another expansion that then drives the memory usage and/or compile time up to a point where the build fails. Arnd