linux-kernel - Re: [PATCH v2 03/10] perf trace: Add trace__bpf_sys_enter_beauty_map() to prepare for fetching data in BPF

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Message-ID: <Zsd7Ep6H24Qq-h5F@x1>
Date: Thu, 22 Aug 2024 14:53:22 -0300
From: Arnaldo Carvalho de Melo <acme@...nel.org>
To: Howard Chu <howardchu95@...il.com>
Cc: adrian.hunter@...el.com, irogers@...gle.com, jolsa@...nel.org,
	kan.liang@...ux.intel.com, namhyung@...nel.org,
	linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 03/10] perf trace: Add
 trace__bpf_sys_enter_beauty_map() to prepare for fetching data in BPF

On Thu, Aug 22, 2024 at 02:49:41PM -0300, Arnaldo Carvalho de Melo wrote:
> On Thu, Aug 15, 2024 at 09:36:19AM +0800, Howard Chu wrote:
> > @@ -3624,7 +3719,9 @@ static int trace__init_syscalls_bpf_prog_array_maps(struct trace *trace)
> >  {
> >  	int map_enter_fd = bpf_map__fd(trace->skel->maps.syscalls_sys_enter);
> >  	int map_exit_fd  = bpf_map__fd(trace->skel->maps.syscalls_sys_exit);
> > +	int beauty_map_fd = bpf_map__fd(trace->skel->maps.beauty_map_enter);
 
> At this point we still don't have that, right? I.e. building with this
> patch, without the ones following it in your series, I get:
 
> builtin-trace.c: In function ‘trace__init_syscalls_bpf_prog_array_maps’:
> builtin-trace.c:3723:58: error: ‘struct <anonymous>’ has no member named ‘beauty_map_enter’
>  3723 |         int beauty_map_fd = bpf_map__fd(trace->skel->maps.beauty_map_enter);
>       |                                                          ^
>   CC      /tmp/build/perf-tools-next/tests/code-reading.o
>   CC      /tmp/build/perf-tools-next/trace/beauty/clone.o
> make[3]: *** [/home/acme/git/perf-tools-next/tools/build/Makefile.build:105: /tmp/build/perf-tools-next/builtin-trace.o] Error 1
> make[3]: *** Waiting for unfinished jobs....
> 
> So we need to squash the patch that introduces beauty_map_enter in the
> augmented_raw_syscalls.bpf.c file to this one, so that we keep things
> bisectable, I'll try to do that.

So just this did the trick, I'll remove it from the later patch in your
series:

- Arnaldo

diff --git a/tools/perf/util/bpf_skel/augmented_raw_syscalls.bpf.c b/tools/perf/util/bpf_skel/augmented_raw_syscalls.bpf.c
index 0acbd74e8c760956..c885673f416dff39 100644
--- a/tools/perf/util/bpf_skel/augmented_raw_syscalls.bpf.c
+++ b/tools/perf/util/bpf_skel/augmented_raw_syscalls.bpf.c
@@ -79,6 +79,13 @@ struct pids_filtered {
 	__uint(max_entries, 64);
 } pids_filtered SEC(".maps");
 
+struct beauty_map_enter {
+	__uint(type, BPF_MAP_TYPE_HASH);
+	__type(key, int);
+	__type(value, __u32[6]);
+	__uint(max_entries, 512);
+} beauty_map_enter SEC(".maps");
+
 /*
  * Desired design of maximum size and alignment (see RFC2553)
  */