Messages in this thread | | | Subject | [RFC PATCH 0/3] perf: show package power consumption in perf | From | Zhang Rui <> | Date | Wed, 18 Aug 2010 15:59:10 +0800 |
| |
Hi, all,
RAPL(running average power limit) is a new feature which provides mechanisms to enforce power consumption limit, on some new processors.
Generally speaking, by using RAPL, OS can set a power budget in a certain time window, and let Hardware to throttle the processor P/T-state to meet this energy limitation.
RAPL also provides a new MSR, i.e. MSR_PKG_ENERGY_STATUS, which reports the total amount of energy consumed by the package.
I'm not sure if to support RAPL or not, but anyway, it sounds like a good idea to export the energy status in perf.
So a new perf pmu and event to show the package energy consumed is introduced in this patch.
Here is what I get after applying the three patches,
#./perf stat -e energy test Performance counter stats for 'test':
202 Joules cost by package 7.926001238 seconds time elapsed
Note that this patch set is made based on Peter's perf-pmu branch, git://git.kernel.org/pub/scm/linux/kernel/git/peterz/linux-2.6-perf.git which provides better interfaces to register/unregister a new pmu.
any comment are welcome. :)
thanks, rui
| |