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A regression of the FTQ noise has been reported by Ying Huang, on the following hardware: 8 threads Intel(R) Core(TM)i7-4770 CPU @ 3.40GHz with 8G memory ... which was caused by this commit: commit4e5160766f("sched/fair: Propagate asynchrous detach") The only part of the patch that can increase the noise is the update of blocked load of group entity in update_blocked_averages(). We can optimize this call and skip the update of group entity if its load and utilization are already null and there is no pending propagation of load in the task group. This optimization partly restores the noise score. A more agressive optimization has been tried but has shown worse score. Reported-by: ying.huang@linux.intel.com Signed-off-by: Vincent Guittot <vincent.guittot@linaro.org> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Mike Galbraith <efault@gmx.de> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: dietmar.eggemann@arm.com Cc: ying.huang@intel.com Fixes:4e5160766f("sched/fair: Propagate asynchrous detach") Link: http://lkml.kernel.org/r/1489758442-2877-1-git-send-email-vincent.guittot@linaro.org [ Fixed typos, improved layout. ] Signed-off-by: Ingo Molnar <mingo@kernel.org>
Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. Please read the Documentation/process/changes.rst file, as it contains the requirements for building and running the kernel, and information about the problems which may result by upgrading your kernel.