Hi Shannon, On Fri, Sep 11, 2015 at 04:54:53PM +0800, Shannon Zhao wrote: > From: Shannon Zhao <shannon.zhao@xxxxxxxxxx> > > This patchset adds guest PMU support for KVM on ARM64. It takes > trap-and-emulate approach. When guest wants to monitor one event, it > will be trapped by KVM and KVM will call perf_event API to create a perf > event and call relevant perf_event APIs to get the count value of event. > > Use perf to test this patchset in guest. When using "perf list", it > shows the list of the hardware events and hardware cache events perf > supports. Then use "perf stat -e EVENT" to monitor some event. For > example, use "perf stat -e cycles" to count cpu cycles and > "perf stat -e cache-misses" to count cache misses. > > Below are the outputs of "perf stat -r 5 sleep 5" when running in host > and guest. > > Host: > Performance counter stats for 'sleep 5' (5 runs): > > 0.551428 task-clock (msec) # 0.000 CPUs utilized ( +- 0.91% ) > 1 context-switches # 0.002 M/sec > 0 cpu-migrations # 0.000 K/sec > 48 page-faults # 0.088 M/sec ( +- 1.05% ) > 1150265 cycles # 2.086 GHz ( +- 0.92% ) > <not supported> stalled-cycles-frontend > <not supported> stalled-cycles-backend > 526398 instructions # 0.46 insns per cycle ( +- 0.89% ) > <not supported> branches > 9485 branch-misses # 17.201 M/sec ( +- 2.35% ) > > 5.000831616 seconds time elapsed ( +- 0.00% ) > > Guest: > Performance counter stats for 'sleep 5' (5 runs): > > 0.730868 task-clock (msec) # 0.000 CPUs utilized ( +- 1.13% ) > 1 context-switches # 0.001 M/sec > 0 cpu-migrations # 0.000 K/sec > 48 page-faults # 0.065 M/sec ( +- 0.42% ) > 1642982 cycles # 2.248 GHz ( +- 1.04% ) > <not supported> stalled-cycles-frontend > <not supported> stalled-cycles-backend > 637964 instructions # 0.39 insns per cycle ( +- 0.65% ) > <not supported> branches > 10377 branch-misses # 14.198 M/sec ( +- 1.09% ) > > 5.001289068 seconds time elapsed ( +- 0.00% ) > > This patchset can be fetched from [1] and the relevant QEMU version for > test can be fetched from [2]. > Is there a changelog for this patch set somewhere? If not, can you include this in v3 addressing Marc's comments? Thanks, -Christoffer -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
