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48 lines
2.1 KiB
48 lines
2.1 KiB
# Copyright (C) 2020 The Android Open Source Project
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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# Notes:
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# * socket used for receiving /proc/pid/{maps,mem} file descriptors
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# * readproc group to stat(/proc/pid) to find out UID of processes, and read
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# /proc/pid/cmdline.
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# * KILL capability for sending BIONIC_SIGNAL_PROFILER.
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# * DAC_READ_SEARCH capability for stack unwinding and on-device symbolization (requires
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# opening libraries/executables for sections not already mapped in).
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# * foreground task group as unwinding based on minidebug info is a heavyweight action.
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service traced_perf /system/bin/traced_perf
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class late_start
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disabled
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socket traced_perf stream 0666 root root
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user nobody
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group nobody readproc
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capabilities KILL DAC_READ_SEARCH
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writepid /dev/cpuset/foreground/tasks
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# Daemon run state:
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# * initially off
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# * |persist.traced_perf.enable| forces daemon to run unconditionally
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# * if kernel doesn't have perf_event_open LSM hooks, daemon is stopped
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# * otherwise, follow |traced.lazy.traced_perf| as an on-demand service
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on property:persist.traced_perf.enable=1
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start traced_perf
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on property:persist.traced_perf.enable="" && property:sys.init.perf_lsm_hooks=""
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stop traced_perf
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on property:persist.traced_perf.enable="" && property:sys.init.perf_lsm_hooks=1 && property:traced.lazy.traced_perf=1
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start traced_perf
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on property:persist.traced_perf.enable="" && property:sys.init.perf_lsm_hooks=1 && property:traced.lazy.traced_perf=""
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stop traced_perf
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on property:persist.traced_perf.enable=0
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setprop persist.traced_perf.enable ""
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