linux-kernel - Re: [RFC v2 0/2] Introduce perf-stat -b for BPF programs

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Date:   Tue, 1 Dec 2020 21:16:54 +0100
From:   Jiri Olsa <jolsa@...hat.com>
To:     Song Liu <songliubraving@...com>
Cc:     linux-kernel@...r.kernel.org, kernel-team@...com,
        peterz@...radead.org, mingo@...hat.com, acme@...nel.org,
        mark.rutland@....com, alexander.shishkin@...ux.intel.com,
        namhyung@...nel.org
Subject: Re: [RFC v2 0/2] Introduce perf-stat -b for BPF programs

On Mon, Nov 30, 2020 at 11:36:45PM -0800, Song Liu wrote:
> This set introduces perf-stat -b option to count events for BPF programs.
> This is similar to bpftool-prog-profile. But perf-stat makes it much more
> flexible.
> 
> Sending as RFC because I haven't addressed some known limitations:
>   1. Only counting events for one BPF program at a time.
>   2. Need extra logic in target__validate().

hi,
I'm getting this eror:

	  CLANG    /home/jolsa/linux-perf/tools/perf/util/bpf_skel/.tmp/dummy.bpf.o
	util/bpf_skel/dummy.bpf.c:4:10: fatal error: 'bpf/bpf_helpers.h' file not found
	#include <bpf/bpf_helpers.h>
		 ^~~~~~~~~~~~~~~~~~~
	1 error generated.

I added change below to fix it, but not sure it's the best fix

jirka


---
diff --git a/tools/perf/Makefile.perf b/tools/perf/Makefile.perf
index d926f0c35ed4..c8f012132d19 100644
--- a/tools/perf/Makefile.perf
+++ b/tools/perf/Makefile.perf
@@ -1022,7 +1022,7 @@ BPFTOOL_CFLAGS := $(filter-out -D_GNU_SOURCE,$(CFLAGS))
 BPFTOOL := $(SKEL_TMP_OUT)/bpftool-bootstrap
 LIBBPF_SRC := $(abspath ../lib/bpf)
 BPFOBJ := $(SKEL_TMP_OUT)/libbpf.a
-BPF_INCLUDE := $(SKEL_TMP_OUT)
+BPF_INCLUDE := -I$(LIBBPF_SRC)/..
 submake_extras := feature_display=0
 
 $(SKEL_TMP_OUT):
@@ -1034,7 +1034,7 @@ $(BPFTOOL): | $(SKEL_TMP_OUT)
 
 $(SKEL_TMP_OUT)/%.bpf.o: util/bpf_skel/%.bpf.c $(BPFOBJ) | $(SKEL_TMP_OUT)
 	$(call QUIET_CLANG, $@)
-	$(Q)$(CLANG) -g -O2 -target bpf	-c $(filter util/bpf_skel/%.bpf.c,$^) -o $@ && \
+	$(Q)$(CLANG) -g -O2 -target bpf	$(BPF_INCLUDE) -c $(filter util/bpf_skel/%.bpf.c,$^) -o $@ && \
 	$(LLVM_STRIP) -g $@
 
 $(SKEL_OUT)/%.skel.h: $(SKEL_TMP_OUT)/%.bpf.o | $(BPFTOOL)