netdev - Re: [PATCH v4 bpf-next 0/4] bpftool: introduce prog profile

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Date:   Wed, 4 Mar 2020 21:41:58 +0100
From:   Jiri Olsa <jolsa@...hat.com>
To:     Song Liu <songliubraving@...com>
Cc:     netdev@...r.kernel.org, bpf@...r.kernel.org, quentin@...valent.com,
        kernel-team@...com, ast@...nel.org, daniel@...earbox.net,
        arnaldo.melo@...il.com, jolsa@...nel.org
Subject: Re: [PATCH v4 bpf-next 0/4] bpftool: introduce prog profile

On Wed, Mar 04, 2020 at 08:08:07PM +0100, Jiri Olsa wrote:
> On Wed, Mar 04, 2020 at 10:07:06AM -0800, Song Liu wrote:
> > This set introduces bpftool prog profile command, which uses hardware
> > counters to profile BPF programs.
> > 
> > This command attaches fentry/fexit programs to a target program. These two
> > programs read hardware counters before and after the target program and
> > calculate the difference.
> > 
> > Changes v3 => v4:
> > 1. Simplify err handling in profile_open_perf_events() (Quentin);
> > 2. Remove redundant p_err() (Quentin);
> > 3. Replace tab with space in bash-completion; (Quentin);
> > 4. Fix typo _bpftool_get_map_names => _bpftool_get_prog_names (Quentin).
> 
> hum, I'm getting:
> 
> 	[jolsa@...l-r440-01 bpftool]$ pwd
> 	/home/jolsa/linux-perf/tools/bpf/bpftool
> 	[jolsa@...l-r440-01 bpftool]$ make
> 	...
> 	make[1]: Leaving directory '/home/jolsa/linux-perf/tools/lib/bpf'
> 	  LINK     _bpftool
> 	make: *** No rule to make target 'skeleton/profiler.bpf.c', needed by 'skeleton/profiler.bpf.o'.  Stop.

ok, I had to apply your patches by hand, because 'git am' refused to
due to fuzz.. so some of you new files did not make it to my tree ;-)

anyway I hit another error now:

	  CC       prog.o
	In file included from prog.c:1553:
	profiler.skel.h: In function ‘profiler_bpf__create_skeleton’:
	profiler.skel.h:136:35: error: ‘struct profiler_bpf’ has no member named ‘rodata’
	  136 |  s->maps[4].mmaped = (void **)&obj->rodata;
	      |                                   ^~
	prog.c: In function ‘profile_read_values’:
	prog.c:1650:29: error: ‘struct profiler_bpf’ has no member named ‘rodata’
	 1650 |  __u32 m, cpu, num_cpu = obj->rodata->num_cpu;

I'll try to figure it out.. might be error on my end

do you have git repo with these changes?

thanks,
jirka