On 2015/9/14 19:53, Christoffer Dall wrote:
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?
I forgot this, while I realized it after sending this patchset out.
If not, can you include this in v3 addressing Marc's comments? Thanks, -Christoffer
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