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Primiano Tucci authoredPerfetto is a performance instrumentation and logging framework, living in AOSP's /external/pefetto. Perfetto introduces in the system one binary and two daemons (the binary can specialize in either depending on the cmdline). 1) traced: unprivileged daemon. This is architecturally similar to logd. It exposes two UNIX sockets: - /dev/socket/traced_producer : world-accessible, allows to stream tracing data. A tmpfs file descriptor is sent via SCM_RIGHTS from traced to each client process, which needs to be able to mmap it R/W (but not X) - /dev/socket/traced_consumer : privilege-accessible (only from: shell, statsd). It allows to configure tracing and read the trace buffer. 2) traced_probes: privileged daemon. This needs to: - access tracingfs (/d/tracing) to turn tracing on and off. - exec atrace - connect to traced_producer to stream data to traced. init.rc file: https://android-review.googlesource.com/c/platform/external/perfetto/+/575382/14/perfetto.rc Bug: 70942310 Change-Id: Ia3b5fdacbd5a8e6e23b82f1d6fabfa07e4abc405Primiano Tucci authoredPerfetto is a performance instrumentation and logging framework, living in AOSP's /external/pefetto. Perfetto introduces in the system one binary and two daemons (the binary can specialize in either depending on the cmdline). 1) traced: unprivileged daemon. This is architecturally similar to logd. It exposes two UNIX sockets: - /dev/socket/traced_producer : world-accessible, allows to stream tracing data. A tmpfs file descriptor is sent via SCM_RIGHTS from traced to each client process, which needs to be able to mmap it R/W (but not X) - /dev/socket/traced_consumer : privilege-accessible (only from: shell, statsd). It allows to configure tracing and read the trace buffer. 2) traced_probes: privileged daemon. This needs to: - access tracingfs (/d/tracing) to turn tracing on and off. - exec atrace - connect to traced_producer to stream data to traced. init.rc file: https://android-review.googlesource.com/c/platform/external/perfetto/+/575382/14/perfetto.rc Bug: 70942310 Change-Id: Ia3b5fdacbd5a8e6e23b82f1d6fabfa07e4abc405
Kbuild 1.30 KiB
# SPDX-License-Identifier: GPL-2.0
#
# Kbuild for top-level directory of the kernel
#####
# Generate bounds.h
bounds-file := include/generated/bounds.h
always-y := $(bounds-file)
targets := kernel/bounds.s
$(bounds-file): kernel/bounds.s FORCE
$(call filechk,offsets,__LINUX_BOUNDS_H__)
#####
# Generate timeconst.h
timeconst-file := include/generated/timeconst.h
filechk_gentimeconst = echo $(CONFIG_HZ) | bc -q $<
$(timeconst-file): kernel/time/timeconst.bc FORCE
$(call filechk,gentimeconst)
#####
# Generate asm-offsets.h
offsets-file := include/generated/asm-offsets.h
always-y += $(offsets-file)
targets += arch/$(SRCARCH)/kernel/asm-offsets.s
arch/$(SRCARCH)/kernel/asm-offsets.s: $(timeconst-file) $(bounds-file)
$(offsets-file): arch/$(SRCARCH)/kernel/asm-offsets.s FORCE
$(call filechk,offsets,__ASM_OFFSETS_H__)
#####
# Check for missing system calls
always-y += missing-syscalls
quiet_cmd_syscalls = CALL $<
cmd_syscalls = $(CONFIG_SHELL) $< $(CC) $(c_flags) $(missing_syscalls_flags)
missing-syscalls: scripts/checksyscalls.sh $(offsets-file) FORCE
$(call cmd,syscalls)
#####
# Check atomic headers are up-to-date
always-y += old-atomics
quiet_cmd_atomics = CALL $<
cmd_atomics = $(CONFIG_SHELL) $<
old-atomics: scripts/atomic/check-atomics.sh FORCE
$(call cmd,atomics)