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Message-Id: <200710240219.25487.ioe-lkml@rameria.de> Date: Wed, 24 Oct 2007 02:19:23 +0200 From: Ingo Oeser <ioe-lkml@...eria.de> To: Gregory Haskins <ghaskins@...ell.com> Cc: linux-rt-users@...r.kernel.org, linux-kernel@...r.kernel.org, Steven Rostedt <rostedt@...dmis.org>, Dmitry Adamushko <dmitry.adamushko@...il.com>, Peter Zijlstra <a.p.zijlstra@...llo.nl>, Ingo Molnar <mingo@...e.hu>, Darren Hart <dvhltc@...ibm.com> Subject: Re: [PATCH 13/13] RT: Cache cpus_allowed weight for optimizing migration Hi Gregory, On Tuesday 23 October 2007, Gregory Haskins wrote: > Calculating the weight is probably relatively expensive, so it is only > done when the cpus_allowed mask is updated (which should be relatively > infrequent, especially compared to scheduling frequency) and cached in > the task_struct. Why not make it a task flag, since according to your code, you are only interested whether this is <= 1 or > 1. Since !(x <= 1) <=> (x > 1) for any given unsigned integer x, the required data structure is a "boolean" or a flag. Best Regards Ingo Oeser - 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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