From: Peter Zijlstra Date: Wed, 2 Sep 2009 11:49:18 +0000 (+0200) Subject: x86: sched: Provide arch implementations using aperf/mperf X-Git-Tag: v2.6.32-rc1~652^2~17 X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=47fe38fcff0517e67d395c039d2e26d2de688a60;p=pandora-kernel.git x86: sched: Provide arch implementations using aperf/mperf APERF/MPERF support for cpu_power. APERF/MPERF is arch defined to be a relative scale of work capacity per logical cpu, this is assumed to include SMT and Turbo mode. APERF/MPERF are specified to both reset to 0 when either counter wraps, which is highly inconvenient, since that'll give a blimp when that happens. The manual specifies writing 0 to the counters after each read, but that's 1) too expensive, and 2) destroys the possibility of sharing these counters with other users, so we live with the blimp - the other existing user does too. Signed-off-by: Peter Zijlstra LKML-Reference: Signed-off-by: Ingo Molnar --- Reading git-diff-tree failed