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Add "make flamegraph".

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4lDO2 2026-05-30 12:59:19 +02:00
parent 5f74a11ed8
commit 03bff2ff78
1 changed files with 17 additions and 0 deletions
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17
Makefile
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@ -133,3 +133,20 @@ FORCE:
# Wireshark # Wireshark
wireshark: FORCE wireshark: FORCE
wireshark $(BUILD)/network.pcap wireshark $(BUILD)/network.pcap
KPROF_KERNEL_BINARY?=recipes/core/profiling-kernel/target/$(TARGET)/build/kernel
KPROF_KERNEL_SYM?=build/flamegraph/$(TARGET)-kernel-syms.txt
KPROF_OUTPUT_TXT?=build/$(ARCH)/$(CONFIG_NAME)/filesystem/home/root/kprof.txt
KPROF_PERF_SVG?=build/flamegraph/$(TARGET)-$(CONFIG_NAME)-kflamegraph.svg
# XXX: This assumes the TSC is invariant, that the value for cpu0 is the same as for all other CPUs, and that the value from ACPI actually reflects the TSC rate. It also only works on Linux.
KPROF_CPU_GHZ?=$(shell (cat /sys/devices/system/cpu/cpu0/acpi_cppc/nominal_freq || echo 3400) | xargs echo "0.001 *" | bc)
# See https://gitlab.redox-os.org/redox-os/kprofiling/-/blob/master/src/main.rs?ref_type=heads#L16-L18
# Set e.g. to "xo" to show individual instruction offsets
KPROF_OPTIONS?=_
flamegraph:
mkdir -p build/flamegraph && \
make mount && \
nm -CS $(KPROF_KERNEL_BINARY) >$(KPROF_KERNEL_SYM) && \
redox-kprofiling $(KPROF_OUTPUT_TXT) $(KPROF_KERNEL_SYM) $(KPROF_OPTIONS) $(KPROF_CPU_GHZ) | inferno-collapse-perf | inferno-flamegraph > $(KPROF_PERF_SVG) && \
make unmount