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Groups > linux.kernel > #1229757 > unrolled thread

[RFC 0/8] tools/build fixes related to eBPF support

Started byArnaldo Carvalho de Melo <acme@kernel.org>
First post2015-09-21 23:30 +0200
Last post2015-09-22 16:00 +0200
Articles 10 — 2 participants

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  [RFC 0/8] tools/build fixes related to eBPF support Arnaldo Carvalho de Melo <acme@kernel.org> - 2015-09-21 23:30 +0200
    [PATCH 6/8] tools lib bpf: Use FEATURE_USER to allow building in the same dir as perf Arnaldo Carvalho de Melo <acme@kernel.org> - 2015-09-21 23:30 +0200
    [PATCH 8/8] perf tools: Make perf depend on libbpf Arnaldo Carvalho de Melo <acme@kernel.org> - 2015-09-21 23:30 +0200
      Re: [PATCH 8/8] perf tools: Make perf depend on libbpf Jiri Olsa <jolsa@redhat.com> - 2015-09-22 09:10 +0200
        Re: [PATCH 8/8] perf tools: Make perf depend on libbpf Arnaldo Carvalho de Melo <acme@kernel.org> - 2015-09-22 15:20 +0200
      Re: [PATCH 8/8] perf tools: Make perf depend on libbpf Jiri Olsa <jolsa@redhat.com> - 2015-09-22 09:10 +0200
        Re: [PATCH 8/8] perf tools: Make perf depend on libbpf Arnaldo Carvalho de Melo <acme@kernel.org> - 2015-09-22 15:20 +0200
          Re: [PATCH 8/8] perf tools: Make perf depend on libbpf Jiri Olsa <jolsa@redhat.com> - 2015-09-22 15:40 +0200
            Re: [PATCH 8/8] perf tools: Make perf depend on libbpf Arnaldo Carvalho de Melo <acme@kernel.org> - 2015-09-22 15:50 +0200
            Re: [PATCH 8/8] perf tools: Make perf depend on libbpf Arnaldo Carvalho de Melo <acme@kernel.org> - 2015-09-22 16:00 +0200

#1229757 — [RFC 0/8] tools/build fixes related to eBPF support

FromArnaldo Carvalho de Melo <acme@kernel.org>
Date2015-09-21 23:30 +0200
Subject[RFC 0/8] tools/build fixes related to eBPF support
Message-ID<qbgOR-1Me-17@gated-at.bofh.it>
Hi Jiri,

	While working on the eBPF patch kit I noticed some problems in the
tools/build/ infrastructure, please take a look and check if they are all sane.

	The last one is not planned for my next perf/core pull req to Ingo,
still requires some more work, but is necessary so that we can exercise the tools/build/
features fixed/introduced in this patchkit.

	There is also that err.h fix from you and a fix for perf probe, because this
is based on my local perf/core branch and will go together in the next perf/core pull req.

	Ah, this is in my perf/ebpf branch at:

git://git.kernel.org/pub/scm/linux/kernel/git/acme/linux.git

https://git.kernel.org/cgit/linux/kernel/git/acme/linux.git/log/?h=perf/ebpf

Thanks in advance,

- Arnaldo

Arnaldo Carvalho de Melo (4):
  tools build: Fixup feature detection display function name
  tools lib ebpf: Fix up FEATURE_{TESTS,DISPLAY} usage
  tools build: Allow setting the feature detection user
  tools lib bpf: Use FEATURE_USER to allow building in the same dir as perf

Jiri Olsa (1):
  perf tools: Add include/err.h into MANIFEST

Masami Hiramatsu (1):
  perf probe: Fix a segfault when removing uprobe events

Wang Nan (2):
  perf tools: Don't assume that the parser returns non empty evsel list
  perf tools: Make perf depend on libbpf

 tools/build/Makefile.feature   | 13 ++++++++-----
 tools/lib/bpf/Makefile         |  5 +++--
 tools/perf/MANIFEST            |  4 ++++
 tools/perf/Makefile.perf       | 19 +++++++++++++++++--
 tools/perf/builtin-probe.c     |  7 +++++--
 tools/perf/config/Makefile     | 19 ++++++++++++++++++-
 tools/perf/tests/make          |  4 +++-
 tools/perf/util/parse-events.c | 16 ++++++++++++++++
 8 files changed, 74 insertions(+), 13 deletions(-)

-- 
2.1.0

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#1229761 — [PATCH 6/8] tools lib bpf: Use FEATURE_USER to allow building in the same dir as perf

FromArnaldo Carvalho de Melo <acme@kernel.org>
Date2015-09-21 23:30 +0200
Subject[PATCH 6/8] tools lib bpf: Use FEATURE_USER to allow building in the same dir as perf
Message-ID<qbgOS-1Me-43@gated-at.bofh.it>
In reply to#1229757
From: Arnaldo Carvalho de Melo <acme@redhat.com>

When building tools/lib/bpf as part of the tools/perf/ build process,
which will happend when we introduce a patch wiring that up, we end up
stomping on the feature detection caching mechanism, that uses a file in
the output directory (O=) that is shared by libbpf and perf to check if
something changed from one build to another that requires redoing the
feature detection process.

By using the recently introduced FEATURE_USER tools/build/ knob, we can
avoid that:

Before, every make invokation would run the feature detection:

  $ make O=/tmp/build/perf -C tools/perf
  make: Entering directory '/home/git/linux/tools/perf'
  Auto-detecting system features:
  ...                         dwarf: [ on  ]
  ...                         glibc: [ on  ]
  <SNIP>
  ...                     get_cpuid: [ on  ]
  ...                           bpf: [ on  ]

    GEN      perf-archive
    GEN      perf-with-kcore

  Auto-detecting system features:
  ...                        libelf: [ on  ]
  ...                           bpf: [ on  ]
  <SNIP>

After:

  $ make O=/tmp/build/perf -C tools/perf
  make: Entering directory '/home/git/linux/tools/perf'
    BUILD:   Doing 'make -j4' parallel build
  make: Leaving directory '/home/git/linux/tools/perf'
  $

Because we now have two different feature detection state files:

  $ ls -la /tmp/build/perf/FEATURE-DUMP*
  -rw-rw-r--. 1 acme acme 338 Sep 21 17:25 /tmp/build/perf/FEATURE-DUMP
  -rw-rw-r--. 1 acme acme  33 Sep 21 17:25 /tmp/build/perf/FEATURE-DUMP.libbpf
  $

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexei Starovoitov <ast@plumgrid.com>
Cc: Borislav Petkov <bp@suse.de>
Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Stephane Eranian <eranian@google.com>
Cc: Wang Nan <wangnan0@huawei.com>
Cc: pi3orama@163.com
Fixes: 1b76c13e4b36 ("bpf tools: Introduce 'bpf' library and add bpf feature check")
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
 tools/lib/bpf/Makefile | 1 +
 1 file changed, 1 insertion(+)

diff --git a/tools/lib/bpf/Makefile b/tools/lib/bpf/Makefile
index 604c12081b4b..e630f9fc4fb6 100644
--- a/tools/lib/bpf/Makefile
+++ b/tools/lib/bpf/Makefile
@@ -64,6 +64,7 @@ srctree := $(patsubst %/,%,$(dir $(srctree)))
 #$(info Determined 'srctree' to be $(srctree))
 endif
 
+FEATURE_USER = .libbpf
 FEATURE_TESTS = libelf libelf-getphdrnum libelf-mmap bpf
 FEATURE_DISPLAY = libelf bpf
 
-- 
2.1.0

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#1229762 — [PATCH 8/8] perf tools: Make perf depend on libbpf

FromArnaldo Carvalho de Melo <acme@kernel.org>
Date2015-09-21 23:30 +0200
Subject[PATCH 8/8] perf tools: Make perf depend on libbpf
Message-ID<qbgOT-1Me-51@gated-at.bofh.it>
In reply to#1229757
From: Wang Nan <wangnan0@huawei.com>

By adding libbpf into perf's Makefile, this patch enables perf to build
libbpf during building if libelf is found and neither NO_LIBELF nor
NO_LIBBPF is set. The newly introduced code is similar to libapi and
libtraceevent building in Makefile.perf.

MANIFEST is also updated for 'make perf-*-src-pkg'.

Append make_no_libbpf to tools/perf/tests/make.

'bpf' feature check is appended into default FEATURE_TESTS and
FEATURE_DISPLAY, so perf will check API version of bpf in
/path/to/kernel/include/uapi/linux/bpf.h. Which should not fail except
when we are trying to port this code to an old kernel.

Error messages are also updated to notify users about the disable of BPF
support of 'perf record' if libelf is missed or BPF API check failed.

tools/lib/bpf is added into TAG_FOLDERS to allow us to navigate on
libbpf files when working on perf using tools/perf/tags.

Signed-off-by: Wang Nan <wangnan0@huawei.com>
Acked-by: Alexei Starovoitov <ast@plumgrid.com>
Cc: Brendan Gregg <brendan.d.gregg@gmail.com>
Cc: Daniel Borkmann <daniel@iogearbox.net>
Cc: David Ahern <dsahern@gmail.com>
Cc: He Kuang <hekuang@huawei.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Kaixu Xia <xiakaixu@huawei.com>
Cc: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Zefan Li <lizefan@huawei.com>
Cc: pi3orama@163.com
Link: http://lkml.kernel.org/r/1441523623-152703-3-git-send-email-wangnan0@huawei.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
 tools/build/Makefile.feature |  6 ++++--
 tools/perf/MANIFEST          |  3 +++
 tools/perf/Makefile.perf     | 19 +++++++++++++++++--
 tools/perf/config/Makefile   | 19 ++++++++++++++++++-
 tools/perf/tests/make        |  4 +++-
 5 files changed, 45 insertions(+), 6 deletions(-)

diff --git a/tools/build/Makefile.feature b/tools/build/Makefile.feature
index 5365d0fefadb..0dedb3d245a1 100644
--- a/tools/build/Makefile.feature
+++ b/tools/build/Makefile.feature
@@ -53,7 +53,8 @@ FEATURE_TESTS ?=			\
 	libdw-dwarf-unwind		\
 	zlib				\
 	lzma				\
-	get_cpuid
+	get_cpuid			\
+	bpf
 
 FEATURE_DISPLAY ?=			\
 	dwarf				\
@@ -71,7 +72,8 @@ FEATURE_DISPLAY ?=			\
 	libdw-dwarf-unwind		\
 	zlib				\
 	lzma				\
-	get_cpuid
+	get_cpuid			\
+	bpf
 
 # Set FEATURE_CHECK_(C|LD)FLAGS-all for all FEATURE_TESTS features.
 # If in the future we need per-feature checks/flags for features not
diff --git a/tools/perf/MANIFEST b/tools/perf/MANIFEST
index 9e6bdf5b2df6..39c38cb45b00 100644
--- a/tools/perf/MANIFEST
+++ b/tools/perf/MANIFEST
@@ -17,6 +17,7 @@ tools/build
 tools/arch/x86/include/asm/atomic.h
 tools/arch/x86/include/asm/rmwcc.h
 tools/lib/traceevent
+tools/lib/bpf
 tools/lib/api
 tools/lib/bpf
 tools/lib/hweight.c
@@ -69,6 +70,8 @@ arch/*/lib/memset*.S
 include/linux/poison.h
 include/linux/hw_breakpoint.h
 include/uapi/linux/perf_event.h
+include/uapi/linux/bpf.h
+include/uapi/linux/bpf_common.h
 include/uapi/linux/const.h
 include/uapi/linux/swab.h
 include/uapi/linux/hw_breakpoint.h
diff --git a/tools/perf/Makefile.perf b/tools/perf/Makefile.perf
index 6c5c699002cb..8af786f458df 100644
--- a/tools/perf/Makefile.perf
+++ b/tools/perf/Makefile.perf
@@ -145,6 +145,7 @@ AWK     = awk
 
 LIB_DIR          = $(srctree)/tools/lib/api/
 TRACE_EVENT_DIR = $(srctree)/tools/lib/traceevent/
+BPF_DIR = $(srctree)/tools/lib/bpf/
 
 # include config/Makefile by default and rule out
 # non-config cases
@@ -180,6 +181,7 @@ strip-libs = $(filter-out -l%,$(1))
 
 ifneq ($(OUTPUT),)
   TE_PATH=$(OUTPUT)
+  BPF_PATH=$(OUTPUT)
 ifneq ($(subdir),)
   LIB_PATH=$(OUTPUT)/../lib/api/
 else
@@ -188,6 +190,7 @@ endif
 else
   TE_PATH=$(TRACE_EVENT_DIR)
   LIB_PATH=$(LIB_DIR)
+  BPF_PATH=$(BPF_DIR)
 endif
 
 LIBTRACEEVENT = $(TE_PATH)libtraceevent.a
@@ -199,6 +202,8 @@ LIBTRACEEVENT_DYNAMIC_LIST_LDFLAGS = -Xlinker --dynamic-list=$(LIBTRACEEVENT_DYN
 LIBAPI = $(LIB_PATH)libapi.a
 export LIBAPI
 
+LIBBPF = $(BPF_PATH)libbpf.a
+
 # python extension build directories
 PYTHON_EXTBUILD     := $(OUTPUT)python_ext_build/
 PYTHON_EXTBUILD_LIB := $(PYTHON_EXTBUILD)lib/
@@ -251,6 +256,9 @@ export PERL_PATH
 LIB_FILE=$(OUTPUT)libperf.a
 
 PERFLIBS = $(LIB_FILE) $(LIBAPI) $(LIBTRACEEVENT)
+ifndef NO_LIBBPF
+  PERFLIBS += $(LIBBPF)
+endif
 
 # We choose to avoid "if .. else if .. else .. endif endif"
 # because maintaining the nesting to match is a pain.  If
@@ -420,6 +428,13 @@ $(LIBAPI)-clean:
 	$(call QUIET_CLEAN, libapi)
 	$(Q)$(MAKE) -C $(LIB_DIR) O=$(OUTPUT) clean >/dev/null
 
+$(LIBBPF): FORCE
+	$(Q)$(MAKE) -C $(BPF_DIR) O=$(OUTPUT) $(OUTPUT)libbpf.a
+
+$(LIBBPF)-clean:
+	$(call QUIET_CLEAN, libbpf)
+	$(Q)$(MAKE) -C $(BPF_DIR) O=$(OUTPUT) clean >/dev/null
+
 help:
 	@echo 'Perf make targets:'
 	@echo '  doc		- make *all* documentation (see below)'
@@ -459,7 +474,7 @@ INSTALL_DOC_TARGETS += quick-install-doc quick-install-man quick-install-html
 $(DOC_TARGETS):
 	$(QUIET_SUBDIR0)Documentation $(QUIET_SUBDIR1) $(@:doc=all)
 
-TAG_FOLDERS= . ../lib/traceevent ../lib/api ../lib/symbol ../include
+TAG_FOLDERS= . ../lib/traceevent ../lib/api ../lib/symbol ../include ../lib/bpf
 TAG_FILES= ../../include/uapi/linux/perf_event.h
 
 TAGS:
@@ -567,7 +582,7 @@ config-clean:
 	$(call QUIET_CLEAN, config)
 	$(Q)$(MAKE) -C $(srctree)/tools/build/feature/ clean >/dev/null
 
-clean: $(LIBTRACEEVENT)-clean $(LIBAPI)-clean config-clean
+clean: $(LIBTRACEEVENT)-clean $(LIBAPI)-clean $(LIBBPF)-clean config-clean
 	$(call QUIET_CLEAN, core-objs)  $(RM) $(LIB_FILE) $(OUTPUT)perf-archive $(OUTPUT)perf-with-kcore $(LANG_BINDINGS)
 	$(Q)find . -name '*.o' -delete -o -name '\.*.cmd' -delete -o -name '\.*.d' -delete
 	$(Q)$(RM) $(OUTPUT).config-detected
diff --git a/tools/perf/config/Makefile b/tools/perf/config/Makefile
index ab09adaabc9c..de89ec574361 100644
--- a/tools/perf/config/Makefile
+++ b/tools/perf/config/Makefile
@@ -106,6 +106,7 @@ ifdef LIBBABELTRACE
   FEATURE_CHECK_LDFLAGS-libbabeltrace := $(LIBBABELTRACE_LDFLAGS) -lbabeltrace-ctf
 endif
 
+FEATURE_CHECK_CFLAGS-bpf = -I. -I$(srctree)/tools/include -I$(srctree)/arch/$(ARCH)/include/uapi -I$(srctree)/include/uapi
 # include ARCH specific config
 -include $(src-perf)/arch/$(ARCH)/Makefile
 
@@ -237,6 +238,7 @@ ifdef NO_LIBELF
   NO_DEMANGLE := 1
   NO_LIBUNWIND := 1
   NO_LIBDW_DWARF_UNWIND := 1
+  NO_LIBBPF := 1
 else
   ifeq ($(feature-libelf), 0)
     ifeq ($(feature-glibc), 1)
@@ -246,13 +248,14 @@ else
       LIBC_SUPPORT := 1
     endif
     ifeq ($(LIBC_SUPPORT),1)
-      msg := $(warning No libelf found, disables 'probe' tool, please install elfutils-libelf-devel/libelf-dev);
+      msg := $(warning No libelf found, disables 'probe' tool and BPF support in 'perf record', please install elfutils-libelf-devel/libelf-dev);
 
       NO_LIBELF := 1
       NO_DWARF := 1
       NO_DEMANGLE := 1
       NO_LIBUNWIND := 1
       NO_LIBDW_DWARF_UNWIND := 1
+      NO_LIBBPF := 1
     else
       ifneq ($(filter s% -static%,$(LDFLAGS),),)
         msg := $(error No static glibc found, please install glibc-static);
@@ -309,6 +312,13 @@ ifndef NO_LIBELF
       $(call detected,CONFIG_DWARF)
     endif # PERF_HAVE_DWARF_REGS
   endif # NO_DWARF
+
+  ifndef NO_LIBBPF
+    ifeq ($(feature-bpf), 1)
+      CFLAGS += -DHAVE_LIBBPF_SUPPORT
+      $(call detected,CONFIG_LIBBPF)
+    endif
+  endif # NO_LIBBPF
 endif # NO_LIBELF
 
 ifeq ($(ARCH),powerpc)
@@ -324,6 +334,13 @@ ifndef NO_LIBUNWIND
   endif
 endif
 
+ifndef NO_LIBBPF
+  ifneq ($(feature-bpf), 1)
+    msg := $(warning BPF API too old. Please install recent kernel headers. BPF support in 'perf record' is disabled.)
+    NO_LIBBPF := 1
+  endif
+endif
+
 dwarf-post-unwind := 1
 dwarf-post-unwind-text := BUG
 
diff --git a/tools/perf/tests/make b/tools/perf/tests/make
index ba31c4bd441d..2cbd0c6901e3 100644
--- a/tools/perf/tests/make
+++ b/tools/perf/tests/make
@@ -44,6 +44,7 @@ make_no_libnuma     := NO_LIBNUMA=1
 make_no_libaudit    := NO_LIBAUDIT=1
 make_no_libbionic   := NO_LIBBIONIC=1
 make_no_auxtrace    := NO_AUXTRACE=1
+make_no_libbpf	    := NO_LIBBPF=1
 make_tags           := tags
 make_cscope         := cscope
 make_help           := help
@@ -66,7 +67,7 @@ make_static         := LDFLAGS=-static
 make_minimal        := NO_LIBPERL=1 NO_LIBPYTHON=1 NO_NEWT=1 NO_GTK2=1
 make_minimal        += NO_DEMANGLE=1 NO_LIBELF=1 NO_LIBUNWIND=1 NO_BACKTRACE=1
 make_minimal        += NO_LIBNUMA=1 NO_LIBAUDIT=1 NO_LIBBIONIC=1
-make_minimal        += NO_LIBDW_DWARF_UNWIND=1 NO_AUXTRACE=1
+make_minimal        += NO_LIBDW_DWARF_UNWIND=1 NO_AUXTRACE=1 NO_LIBBPF=1
 
 # $(run) contains all available tests
 run := make_pure
@@ -94,6 +95,7 @@ run += make_no_libnuma
 run += make_no_libaudit
 run += make_no_libbionic
 run += make_no_auxtrace
+run += make_no_libbpf
 run += make_help
 run += make_doc
 run += make_perf_o
-- 
2.1.0

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#1229935 — Re: [PATCH 8/8] perf tools: Make perf depend on libbpf

FromJiri Olsa <jolsa@redhat.com>
Date2015-09-22 09:10 +0200
SubjectRe: [PATCH 8/8] perf tools: Make perf depend on libbpf
Message-ID<qbpSa-6Dl-5@gated-at.bofh.it>
In reply to#1229762
On Mon, Sep 21, 2015 at 06:23:21PM -0300, Arnaldo Carvalho de Melo wrote:

SNIP

> +      NO_LIBBPF := 1
>      else
>        ifneq ($(filter s% -static%,$(LDFLAGS),),)
>          msg := $(error No static glibc found, please install glibc-static);
> @@ -309,6 +312,13 @@ ifndef NO_LIBELF
>        $(call detected,CONFIG_DWARF)
>      endif # PERF_HAVE_DWARF_REGS
>    endif # NO_DWARF
> +
> +  ifndef NO_LIBBPF
> +    ifeq ($(feature-bpf), 1)
> +      CFLAGS += -DHAVE_LIBBPF_SUPPORT
> +      $(call detected,CONFIG_LIBBPF)

what depends on CONFIG_LIBBPF ? I dont see any object being dependent on it

jirka
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#1230176 — Re: [PATCH 8/8] perf tools: Make perf depend on libbpf

FromArnaldo Carvalho de Melo <acme@kernel.org>
Date2015-09-22 15:20 +0200
SubjectRe: [PATCH 8/8] perf tools: Make perf depend on libbpf
Message-ID<qbvEe-6p9-31@gated-at.bofh.it>
In reply to#1229935
Em Tue, Sep 22, 2015 at 09:02:59AM +0200, Jiri Olsa escreveu:
> On Mon, Sep 21, 2015 at 06:23:21PM -0300, Arnaldo Carvalho de Melo wrote:
> 
> SNIP
> 
> > +      NO_LIBBPF := 1
> >      else
> >        ifneq ($(filter s% -static%,$(LDFLAGS),),)
> >          msg := $(error No static glibc found, please install glibc-static);
> > @@ -309,6 +312,13 @@ ifndef NO_LIBELF
> >        $(call detected,CONFIG_DWARF)
> >      endif # PERF_HAVE_DWARF_REGS
> >    endif # NO_DWARF
> > +
> > +  ifndef NO_LIBBPF
> > +    ifeq ($(feature-bpf), 1)
> > +      CFLAGS += -DHAVE_LIBBPF_SUPPORT
> > +      $(call detected,CONFIG_LIBBPF)
> 
> what depends on CONFIG_LIBBPF ? I dont see any object being dependent on it

Nothing, as far as this patchkit goes, that is why I said this in the
cover letter:

---------------------------------------------------------------
	The last one is not planned for my next perf/core pull req to
Ingo, still requires some more work, but is necessary so that we can
exercise the tools/build/ features fixed/introduced in this patchkit.
---------------------------------------------------------------

https://lkml.kernel.org/r/1442870601-26004-1-git-send-email-acme@kernel.org

- Arnaldo
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#1229936 — Re: [PATCH 8/8] perf tools: Make perf depend on libbpf

FromJiri Olsa <jolsa@redhat.com>
Date2015-09-22 09:10 +0200
SubjectRe: [PATCH 8/8] perf tools: Make perf depend on libbpf
Message-ID<qbpSa-6Dl-7@gated-at.bofh.it>
In reply to#1229762
On Mon, Sep 21, 2015 at 06:23:21PM -0300, Arnaldo Carvalho de Melo wrote:
> From: Wang Nan <wangnan0@huawei.com>
> 
> By adding libbpf into perf's Makefile, this patch enables perf to build
> libbpf during building if libelf is found and neither NO_LIBELF nor
> NO_LIBBPF is set. The newly introduced code is similar to libapi and
> libtraceevent building in Makefile.perf.
> 
> MANIFEST is also updated for 'make perf-*-src-pkg'.
> 
> Append make_no_libbpf to tools/perf/tests/make.
> 
> 'bpf' feature check is appended into default FEATURE_TESTS and
> FEATURE_DISPLAY, so perf will check API version of bpf in
> /path/to/kernel/include/uapi/linux/bpf.h. Which should not fail except
> when we are trying to port this code to an old kernel.
> 
> Error messages are also updated to notify users about the disable of BPF
> support of 'perf record' if libelf is missed or BPF API check failed.
> 
> tools/lib/bpf is added into TAG_FOLDERS to allow us to navigate on
> libbpf files when working on perf using tools/perf/tags.
> 
> Signed-off-by: Wang Nan <wangnan0@huawei.com>
> Acked-by: Alexei Starovoitov <ast@plumgrid.com>
> Cc: Brendan Gregg <brendan.d.gregg@gmail.com>
> Cc: Daniel Borkmann <daniel@iogearbox.net>
> Cc: David Ahern <dsahern@gmail.com>
> Cc: He Kuang <hekuang@huawei.com>
> Cc: Jiri Olsa <jolsa@kernel.org>
> Cc: Kaixu Xia <xiakaixu@huawei.com>
> Cc: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
> Cc: Namhyung Kim <namhyung@kernel.org>
> Cc: Paul Mackerras <paulus@samba.org>
> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
> Cc: Zefan Li <lizefan@huawei.com>
> Cc: pi3orama@163.com
> Link: http://lkml.kernel.org/r/1441523623-152703-3-git-send-email-wangnan0@huawei.com
> Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
> ---
>  tools/build/Makefile.feature |  6 ++++--
>  tools/perf/MANIFEST          |  3 +++
>  tools/perf/Makefile.perf     | 19 +++++++++++++++++--
>  tools/perf/config/Makefile   | 19 ++++++++++++++++++-
>  tools/perf/tests/make        |  4 +++-
>  5 files changed, 45 insertions(+), 6 deletions(-)
> 

missing doc hunk in Makefile.perf

jirka


---
diff --git a/tools/perf/Makefile.perf b/tools/perf/Makefile.perf
index 8af786f458df..bb949c9e818a 100644
--- a/tools/perf/Makefile.perf
+++ b/tools/perf/Makefile.perf
@@ -75,6 +75,8 @@ include config/utilities.mak
 # Define NO_LZMA if you do not want to support compressed (xz) kernel modules
 #
 # Define NO_AUXTRACE if you do not want AUX area tracing support
+#
+# Define NO_BPF if you do not want BPF support
 
 # As per kernel Makefile, avoid funny character set dependencies
 unexport LC_ALL
--
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#1230174 — Re: [PATCH 8/8] perf tools: Make perf depend on libbpf

FromArnaldo Carvalho de Melo <acme@kernel.org>
Date2015-09-22 15:20 +0200
SubjectRe: [PATCH 8/8] perf tools: Make perf depend on libbpf
Message-ID<qbvEe-6p9-29@gated-at.bofh.it>
In reply to#1229936
Em Tue, Sep 22, 2015 at 09:03:40AM +0200, Jiri Olsa escreveu:
> missing doc hunk in Makefile.perf

Ok, adding this. Thanks! So, with that comment about FEATURE_DUMP fixed:

https://git.kernel.org/cgit/linux/kernel/git/acme/linux.git/commit/?h=perf/ebpf&id=c1500a11e9b3ec5546233013b7c4b64af103c617

Can I have your acks? :-)

- Arnaldo
 
> jirka
> 
> 
> ---
> diff --git a/tools/perf/Makefile.perf b/tools/perf/Makefile.perf
> index 8af786f458df..bb949c9e818a 100644
> --- a/tools/perf/Makefile.perf
> +++ b/tools/perf/Makefile.perf
> @@ -75,6 +75,8 @@ include config/utilities.mak
>  # Define NO_LZMA if you do not want to support compressed (xz) kernel modules
>  #
>  # Define NO_AUXTRACE if you do not want AUX area tracing support
> +#
> +# Define NO_BPF if you do not want BPF support
>  
>  # As per kernel Makefile, avoid funny character set dependencies
>  unexport LC_ALL
--
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#1230206 — Re: [PATCH 8/8] perf tools: Make perf depend on libbpf

FromJiri Olsa <jolsa@redhat.com>
Date2015-09-22 15:40 +0200
SubjectRe: [PATCH 8/8] perf tools: Make perf depend on libbpf
Message-ID<qbvXz-6LG-17@gated-at.bofh.it>
In reply to#1230174
On Tue, Sep 22, 2015 at 10:18:07AM -0300, Arnaldo Carvalho de Melo wrote:
> Em Tue, Sep 22, 2015 at 09:03:40AM +0200, Jiri Olsa escreveu:
> > missing doc hunk in Makefile.perf
> 
> Ok, adding this. Thanks! So, with that comment about FEATURE_DUMP fixed:
> 
> https://git.kernel.org/cgit/linux/kernel/git/acme/linux.git/commit/?h=perf/ebpf&id=c1500a11e9b3ec5546233013b7c4b64af103c617
> 
> Can I have your acks? :-)

would be easier if you resend, anyway:

tools lib bpf: Use FEATURE_USER to allow building in the same dir as perf	Arnaldo Carvalho de Melo	2	-1/+2
  - ack

tools build: Allow setting the feature detection user	Arnaldo Carvalho de Melo	1	-2/+3
  - missing doc hunk which is in above patch, but ack..

tools lib ebpf: Fix up FEATURE_{TESTS,DISPLAY} usage	Arnaldo Carvalho de Melo	1	-2/+2
  - ack

tools build: Fixup feature detection display function name	Arnaldo Carvalho de Melo	1	-1/+1
  - ack


jirka
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#1230216 — Re: [PATCH 8/8] perf tools: Make perf depend on libbpf

FromArnaldo Carvalho de Melo <acme@kernel.org>
Date2015-09-22 15:50 +0200
SubjectRe: [PATCH 8/8] perf tools: Make perf depend on libbpf
Message-ID<qbw7f-6Xg-1@gated-at.bofh.it>
In reply to#1230206
Em Tue, Sep 22, 2015 at 03:31:36PM +0200, Jiri Olsa escreveu:
> On Tue, Sep 22, 2015 at 10:18:07AM -0300, Arnaldo Carvalho de Melo wrote:
> > Em Tue, Sep 22, 2015 at 09:03:40AM +0200, Jiri Olsa escreveu:
> > > missing doc hunk in Makefile.perf
> > 
> > Ok, adding this. Thanks! So, with that comment about FEATURE_DUMP fixed:
> > 
> > https://git.kernel.org/cgit/linux/kernel/git/acme/linux.git/commit/?h=perf/ebpf&id=c1500a11e9b3ec5546233013b7c4b64af103c617
> > 
> > Can I have your acks? :-)
> 
> would be easier if you resend, anyway:

I'll try to do it next time, i.e. go on resubmitting with v(N++) series till
I get the acks, thanks for the ones here tho,

- Arnaldo
 
> tools lib bpf: Use FEATURE_USER to allow building in the same dir as perf	Arnaldo Carvalho de Melo	2	-1/+2
>   - ack
> 
> tools build: Allow setting the feature detection user	Arnaldo Carvalho de Melo	1	-2/+3
>   - missing doc hunk which is in above patch, but ack..
> 
> tools lib ebpf: Fix up FEATURE_{TESTS,DISPLAY} usage	Arnaldo Carvalho de Melo	1	-2/+2
>   - ack
> 
> tools build: Fixup feature detection display function name	Arnaldo Carvalho de Melo	1	-1/+1
>   - ack
> 
> 
> jirka
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#1230233 — Re: [PATCH 8/8] perf tools: Make perf depend on libbpf

FromArnaldo Carvalho de Melo <acme@kernel.org>
Date2015-09-22 16:00 +0200
SubjectRe: [PATCH 8/8] perf tools: Make perf depend on libbpf
Message-ID<qbwgW-78r-19@gated-at.bofh.it>
In reply to#1230206
Em Tue, Sep 22, 2015 at 03:31:36PM +0200, Jiri Olsa escreveu:
> On Tue, Sep 22, 2015 at 10:18:07AM -0300, Arnaldo Carvalho de Melo wrote:
> > Em Tue, Sep 22, 2015 at 09:03:40AM +0200, Jiri Olsa escreveu:
> > > missing doc hunk in Makefile.perf
> > 
> > Ok, adding this. Thanks! So, with that comment about FEATURE_DUMP fixed:
> > 
> > https://git.kernel.org/cgit/linux/kernel/git/acme/linux.git/commit/?h=perf/ebpf&id=c1500a11e9b3ec5546233013b7c4b64af103c617
> > 
> > Can I have your acks? :-)
> 
> would be easier if you resend, anyway:
> 
> tools lib bpf: Use FEATURE_USER to allow building in the same dir as perf	Arnaldo Carvalho de Melo	2	-1/+2
>   - ack
> 
> tools build: Allow setting the feature detection user	Arnaldo Carvalho de Melo	1	-2/+3
>   - missing doc hunk which is in above patch, but ack..

Argh, I added the comment, but to "Use FEATURE_USER to allow bu...",
i.e. the wrong patch, fixed it:

"tools build: Allow setting the feature detection user"
https://git.kernel.org/cgit/linux/kernel/git/acme/linux.git/commit/?h=perf/core&id=13e96db61c1c32cd4c8102a95129bb7677cc746d

"tools lib bpf: Use FEATURE_USER to allow building in the same dir as perf"
https://git.kernel.org/cgit/linux/kernel/git/acme/linux.git/commit/?h=perf/core&id=65f041bee7838e2a91dbbc0a917d9291adbb3484

- Arnaldo
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