Commit-ID:  b119970aa541091e405373399690c24ead9d2920
Gitweb:     https://git.kernel.org/tip/b119970aa541091e405373399690c24ead9d2920
Author:     Arnaldo Carvalho de Melo <a...@redhat.com>
AuthorDate: Tue, 16 Jul 2019 11:53:03 -0300
Committer:  Arnaldo Carvalho de Melo <a...@redhat.com>
CommitDate: Mon, 29 Jul 2019 18:34:41 -0300

perf trace: Handle raw_syscalls:sys_enter just like the BPF_OUTPUT augmented 
event

So, we use a PERF_COUNT_SW_BPF_OUTPUT to output the augmented sys_enter
payload, i.e. to output more than just the raw syscall args, and if
something goes wrong when handling an unfiltered syscall, we bail out
and just return 1 in the bpf program associated with
raw_syscalls:sys_enter, meaning, don't filter that tracepoint, in which
case what will appear in the perf ring buffer isn't the BPF_OUTPUT
event, but the original raw_syscalls:sys_enter event with its normal
payload.

Now that we're switching to using a bpf_tail_call +
BPF_MAP_TYPE_PROG_ARRAY we're going to use this in the common case, so a
bug where raw_syscalls:sys_enter wasn't being handled by
trace__sys_enter() surfaced and for  that case, instead of using the
strace-like augmenter (trace__sys_enter()), we continued to use the
normal generic tracepoint handler:

  (gdb) p evsel
  $2 = (struct perf_evsel *) 0xc03e40
  (gdb) p evsel->name
  $3 = 0xbc56c0 "raw_syscalls:sys_enter"
  (gdb) p ((struct perf_evsel *) 0xc03e40)->name
  $4 = 0xbc56c0 "raw_syscalls:sys_enter"
  (gdb) p ((struct perf_evsel *) 0xc03e40)->handler
  $5 = (void *) 0x495eb3 <trace__event_handler>

This resulted in this:

     0.027 raw_syscalls:sys_enter:NR 12 (0, 7fcfcac64c9b, 4d, 7fcfcac64c9b, 
7fcfcac6ce00, 19)
     ... [continued]: brk())                = 0x563b88677000

I.e. only the sys_exit tracepoint was being properly handled, but since
the sys_enter went to the generic trace__event_handler() we printed it
using libtraceevent's formatter instead of 'perf trace's strace-like
one.

Fix it by setting trace__sys_enter() as the handler for
raw_syscalls:sys_enter and setup the tp_field tracepoint field
accessors.

Now, to test it we just make raw_syscalls:sys_enter return 1 right after
checking if the pid is filtered, making it not use
bpf_perf_output_event() but rather ask for the tracepoint not to be
filtered and the result is the expected one:

  brk(NULL)                               = 0x556f42d6e000

I.e. raw_syscalls:sys_enter returns 1, gets handled by
trace__sys_enter() and gets it combined with the raw_syscalls:sys_exit
in a strace-like way.

Cc: Adrian Hunter <adrian.hun...@intel.com>
Cc: Jiri Olsa <jo...@kernel.org>
Cc: Luis Cláudio Gonçalves <lclau...@redhat.com>
Cc: Namhyung Kim <namhy...@kernel.org>
Link: https://lkml.kernel.org/n/tip-0mkocgk31nmy0odknegcb...@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <a...@redhat.com>
---
 tools/perf/builtin-trace.c | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/tools/perf/builtin-trace.c b/tools/perf/builtin-trace.c
index fb8b8e78d7b5..872c9cc982a5 100644
--- a/tools/perf/builtin-trace.c
+++ b/tools/perf/builtin-trace.c
@@ -4128,7 +4128,22 @@ int cmd_trace(int argc, const char **argv)
                                if 
(perf_evsel__init_augmented_syscall_tp(augmented, evsel) ||
                                    
perf_evsel__init_augmented_syscall_tp_args(augmented))
                                        goto out;
+                               /*
+                                * Augmented is __augmented_syscalls__ 
BPF_OUTPUT event
+                                * Above we made sure we can get from the 
payload the tp fields
+                                * that we get from syscalls:sys_enter tracefs 
format file.
+                                */
                                augmented->handler = trace__sys_enter;
+                               /*
+                                * Now we do the same for the 
*syscalls:sys_enter event so that
+                                * if we handle it directly, i.e. if the BPF 
prog returns 0 so
+                                * as not to filter it, then we'll handle it 
just like we would
+                                * for the BPF_OUTPUT one:
+                                */
+                               if 
(perf_evsel__init_augmented_syscall_tp(evsel, evsel) ||
+                                   
perf_evsel__init_augmented_syscall_tp_args(evsel))
+                                       goto out;
+                               evsel->handler = trace__sys_enter;
                        }
 
                        if (strstarts(perf_evsel__name(evsel), 
"syscalls:sys_exit_")) {

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