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Bottomley" , Alexander Lobakin , Alexander Shishkin , Alexey Klimov , Andrea Merello , Andy Shevchenko , Arnaldo Carvalho de Melo , Arnd Bergmann , Ben Gardon , Benjamin Herrenschmidt , Brian Cain , Catalin Marinas , Christoph Lameter , Daniel Bristot de Oliveira , David Hildenbrand , Dennis Zhou , Geert Uytterhoeven , Heiko Carstens , Ian Rogers , Ingo Molnar , Jaegeuk Kim , Jakub Kicinski , Jiri Olsa , Joe Perches , Jonas Bonn , Leo Yan , Mark Rutland , Namhyung Kim , Palmer Dabbelt , Paolo Bonzini , Peter Xu , Peter Zijlstra , Rasmus Villemoes , Rich Felker , Samuel Mendoza-Jonas , Sean Christopherson , Sergey Senozhatsky , Shuah Khan , Stefan Kristiansson , Steven Rostedt , Tejun Heo , Thomas Bogendoerfer , Ulf Hansson , Will Deacon , Wolfram Sang , Yoshinori Sato Subject: Re: [PATCH 17/17] vsprintf: rework bitmap_list_string Message-ID: References: <20210814211713.180533-1-yury.norov@gmail.com> <20210814211713.180533-18-yury.norov@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: Authentication-Results: imf13.hostedemail.com; dkim=pass header.d=gmail.com header.s=20161025 header.b=OheyBCur; spf=pass (imf13.hostedemail.com: domain of yurynorov@gmail.com designates 209.85.222.176 as permitted sender) smtp.mailfrom=yurynorov@gmail.com; dmarc=pass (policy=none) header.from=gmail.com X-Stat-Signature: cpfuh6whph19u349a5nxs1xcg33yytuu X-Rspamd-Queue-Id: B5ECE101BC92 X-Rspamd-Server: rspam04 X-HE-Tag: 1630011548-439537 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, Aug 26, 2021 at 04:15:09PM +0200, Petr Mladek wrote: > On Sat 2021-08-14 14:17:13, Yury Norov wrote: > > bitmap_list_string() is very ineffective when printing bitmaps with long > > ranges of set bits because it calls find_next_bit for each bit in the > > bitmap. We can do better by detecting ranges of set bits. > > > > In my environment, before/after is 943008/31008 ns. > > > > Signed-off-by: Yury Norov > > Tested-by: Wolfram Sang > > I like the patch. The new code is much easier to follow. > Feel free to use: > > Reviewed-by: Petr Mladek > > Best Regards, > Petr Thanks Petr! The patch is already in the linux-next. Andrew, Stephen, can you please append Petr's reviewed-by? Thanks, Yury