mirrors/linux
1
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git synced 2026-04-06 09:04:22 -04:00
Code Issues Packages Projects Releases Wiki Activity

rtla/tests: Test BPF action program

Browse Source 
Add a test that implements a BPF program writing to a test map, which
is attached to RTLA via --bpf-action to be executed on theshold
overflow.

A combination of --on-threshold shell with bpftool (which is always
present if BPF support is enabled) is used to check whether the BPF
program has executed successfully.

Suggested-by: Crystal Wood <crwood@redhat.com>
Link: https://lore.kernel.org/r/20251126144205.331954-5-tglozar@redhat.com
Signed-off-by: Tomas Glozar <tglozar@redhat.com>
This commit is contained in:
Tomas Glozar
2025-11-26 15:42:02 +01:00
parent 0304a3b7ec
commit 5525aebd4e
3 changed files with 48 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files

10
tools/tracing/rtla/Makefile
View File

@@ -76,12 +76,18 @@ src/timerlat.skel.h: src/timerlat.bpf.o
example/timerlat_bpf_action.o: example/timerlat_bpf_action.c
$(QUIET_CLANG)$(CLANG) -g -O2 -target bpf -c $(filter %.c,$^) -o $@
tests/bpf/bpf_action_map.o: tests/bpf/bpf_action_map.c
$(QUIET_CLANG)$(CLANG) -g -O2 -target bpf -c $(filter %.c,$^) -o $@
else
src/timerlat.skel.h:
$(Q)echo '/* BPF skeleton is disabled */' > src/timerlat.skel.h
example/timerlat_bpf_action.o: example/timerlat_bpf_action.c
$(Q)echo "BPF skeleton support is disabled, skipping example/timerlat_bpf_action.o"
tests/bpf/bpf_action_map.o: tests/bpf/bpf_action_map.c
$(Q)echo "BPF skeleton support is disabled, skipping tests/bpf/bpf_action_map.o"
endif
$(RTLA): $(RTLA_IN)
@@ -103,7 +109,7 @@ clean: doc_clean fixdep-clean
$(Q)rm -f rtla rtla-static fixdep FEATURE-DUMP rtla-*
$(Q)rm -rf feature
$(Q)rm -f src/timerlat.bpf.o src/timerlat.skel.h example/timerlat_bpf_action.o
check: $(RTLA)
RTLA=$(RTLA) prove -o -f tests/
check: $(RTLA) tests/bpf/bpf_action_map.o
RTLA=$(RTLA) BPFTOOL=$(SYSTEM_BPFTOOL) prove -o -f tests/
examples: example/timerlat_bpf_action.o
.PHONY: FORCE clean check

25
tools/tracing/rtla/tests/bpf/bpf_action_map.c Normal file
View File

@@ -0,0 +1,25 @@
// SPDX-License-Identifier: GPL-2.0
#include <linux/bpf.h>
#include <bpf/bpf_tracing.h>
char LICENSE[] SEC("license") = "GPL";
struct {
__uint(type, BPF_MAP_TYPE_ARRAY);
__uint(max_entries, 1);
__type(key, unsigned int);
__type(value, unsigned long long);
} rtla_test_map SEC(".maps");
struct trace_event_raw_timerlat_sample;
SEC("tp/timerlat_action")
int action_handler(struct trace_event_raw_timerlat_sample *tp_args)
{
unsigned int key = 0;
unsigned long long value = 42;
bpf_map_update_elem(&rtla_test_map, &key, &value, BPF_ANY);
return 0;
}

15
tools/tracing/rtla/tests/timerlat.t
View File

@@ -67,6 +67,21 @@ check "hist with trace output at end" \
"timerlat hist -d 1s --on-end trace" 0 "^ Saving trace to timerlat_trace.txt$"
check "top with trace output at end" \
"timerlat top -d 1s --on-end trace" 0 "^ Saving trace to timerlat_trace.txt$"
# BPF action program tests
if [ "$option" -eq 0 ]
then
# Test BPF action program properly in BPF mode
[ -z "$BPFTOOL" ] && BPFTOOL=bpftool
check "hist with BPF action program (BPF mode)" \
"timerlat hist -T 2 --bpf-action tests/bpf/bpf_action_map.o --on-threshold shell,command='$BPFTOOL map dump name rtla_test_map'" \
2 '"value": 42'
else
# Test BPF action program failure in non-BPF mode
check "hist with BPF action program (non-BPF mode)" \
"timerlat hist -T 2 --bpf-action tests/bpf/bpf_action_map.o" \
1 "BPF actions are not supported in tracefs-only mode"
fi
done
test_end