Supported device list

[colordancer]

Hi there,

I've only seen 4 devices in SUPPORTED_DEVICES and BROKEN_DEVICES from the source code.

SUPPORTED_DEVICES = set([
'mantaray', # Nexus 10
'nakasi', # Nexus 7 (2012)
])
BROKEN_DEVICES = set([
'razor', # Nexus 7 (2013)
'hammerhead', # Nexus 5
])

And I've tested Nexus 5(hammerhead) and seen a warning message when I tried ./android_ndk_perf --apk testbed-debug.apk record -o perf.data.

WARNING: AOSP on HammerHead is not in the list of supported devices. It is likely that the
performance counters don't work so you may need to try a different device.

So I'd like to ask whether Nexus 6/5x is supported by Android perf, as I badly need to use to perf to profile my apk to show its run-time call graph. Thanks.

[stewartmiles]

Regarding Nexus 6 / 5x, we haven't run tests with android_ndk_perf to see
whether the performance counters are accurate.

Unfortunately, right now Linux perf appears to be a little broken on
devices running Android M and above since maintenance has been dropped for
the tool. We have a task open to switch android_ndk_perf over from using
the port of Linux perf to simpleperf
https://android.googlesource.com/platform/prebuilts/simpleperf/+/refs/heads/ndk-r13-release/README.md

Right now we recommend trying out simpleperf to profile your applications.
If you have time we would appreciate a patch to android_ndk_perf to use
simpleperf instead of Linux perf :)

On Sun, Sep 18, 2016 at 8:24 PM, colordancer notifications@github.com
wrote:

Hi there,

I've only seen 4 devices in SUPPORTED_DEVICES and BROKEN_DEVICES from the
source code.
`## Set of tested devices that are known to support perf.
SUPPORTED_DEVICES = set([
'mantaray', # Nexus 10
'nakasi', # Nexus 7 (2012)
])
Set of tested devices that are known to have broken support for perf.

BROKEN_DEVICES = set([
'razor', # Nexus 7 (2013)
'hammerhead', # Nexus 5
])`

And I've tested Nexus 5(hammerhead) and seen a warning message when I
tried ./android_ndk_perf --apk testbed-debug.apk record -o perf.data.
WARNING: AOSP on HammerHead is not in the list of supported devices. It is
likely that the
performance counters don't work so you may need to try a different device.

So I'd like to ask whether Nexus 6/5x is supported by Android perf, as I
badly need to use to perf to profile my apk to show its run-time call
graph. Thanks.

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[colordancer]

Thanks for the update. I also found external/linux-tools-perf was cleaned in ASOP master repo. Then I turned to simpleperf and had been trying.

So far it works well. But it seems branch profiling failed in my Nexus 5x. The application I profiled was liquidfun-master from fplutil.

root@bullhead:/data/local/tmp # ./simpleperf report -b
Cmdline: /data/local/tmp/simpleperf record -b -e branch-loads:u -g -p 13155
Arch: arm
Event: branch-loads:u (type 3, config 5)
Samples: 0
Event count: 0

I tried both commands, -b and -b -e.

BTW, I'm not sure it's cool to raise the questions about simpleperf here, as I've more questions to ask. If it's not the right place, I will try other ways.