From 03bff2ff78e689eef04622f684e6100772c3fce9 Mon Sep 17 00:00:00 2001
From: 4lDO2 <4lDO2@protonmail.com>
Date: Sat, 30 May 2026 12:59:19 +0200
Subject: [PATCH] Add "make flamegraph".

---
 Makefile | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/Makefile b/Makefile
index e9a4fb9e..6ed6ae3e 100644
--- a/Makefile
+++ b/Makefile
@@ -133,3 +133,20 @@ FORCE:
 # Wireshark
 wireshark: FORCE
 	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