From: Dirk Brandewie Date: Thu, 29 May 2014 16:32:24 +0000 (-0700) Subject: intel_pstate: add sample time scaling X-Git-Tag: omap-for-v3.16/fixes-against-rc1~103^2~1 X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=c4ee841f602e5eef8eab673295c49c5b49d7732b;p=pandora-kernel.git intel_pstate: add sample time scaling The PID assumes that samples are of equal time, which for a deferable timers this is not true when the system goes idle. This causes the PID to take a long time to converge to the min P state and depending on the pattern of the idle load can make the P state appear stuck. The hold-off value of three sample times before using the scaling is to give a grace period for applications that have high performance requirements and spend a lot of time idle, The poster child for this behavior is the ffmpeg benchmark in the Phoronix test suite. Cc: 3.14+ # 3.14+ Signed-off-by: Dirk Brandewie Signed-off-by: Rafael J. Wysocki --- Reading git-diff-tree failed