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Date: Tue, 30 Apr 2013 13:11:19 +0200 From: Ingo Molnar <mingo@...nel.org> To: Stanislaw Gruszka <sgruszka@...hat.com> Cc: Peter Zijlstra <peterz@...radead.org>, Frederic Weisbecker <fweisbec@...il.com>, hpa@...or.com, rostedt@...dmis.org, akpm@...ux-foundation.org, tglx@...utronix.de, Linus Torvalds <torvalds@...ux-foundation.org>, linux-kernel@...r.kernel.org, Dave Hansen <dave@...1.net> Subject: Re: [PATCH -tip 1/4] sched: Avoid cputime scaling overflow * Stanislaw Gruszka <sgruszka@...hat.com> wrote: > Here is patch, which add Linus cputime scaling algorithm to the kernel. > > This is follow up of commit d9a3c9823a2e6a543eb7807fb3d15d8233817ec5 > "sched: Lower chances of cputime scaling overflow" which try to avoid > multiplication overflow, but not guarantee that the overflow will not > happen. > > Linus crated different algorithm, which avoid completely multiplication > overflow by dropping precision when numbers are big. It was tested > by me and it gives good relative error of scaled numbers. > > Signed-off-by: Stanislaw Gruszka <sgruszka@...hat.com> For multi-authored code it's generally nice to add a tag like this: Originally-From: Linus Torvalds <torvalds@...ux-foundation.org> It would also be nice to quote the testing results/output and the precision estimations in the changelog - so that others can see the code's current capabilities and limitations. Thanks, Ingo -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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