linux-kernel - [tip: perf/core] perf trace: Associate the "msr" tracepoint arg name with x86_MSR_

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Date:   Tue, 15 Oct 2019 05:31:44 -0000
From:   "tip-bot2 for Arnaldo Carvalho de Melo" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     Adrian Hunter <adrian.hunter@...el.com>,
        Brendan Gregg <brendan.d.gregg@...il.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Luis Cláudio Gonçalves 
        <lclaudio@...hat.com>, Namhyung Kim <namhyung@...nel.org>,
        Arnaldo Carvalho de Melo <acme@...hat.com>,
        Ingo Molnar <mingo@...nel.org>, Borislav Petkov <bp@...en8.de>,
        linux-kernel@...r.kernel.org
Subject: [tip: perf/core] perf trace: Associate the "msr" tracepoint arg name
 with x86_MSR__scnprintf()

The following commit has been merged into the perf/core branch of tip:

Commit-ID:     c330ef2847eeedfa9d06f03836dfd4fc6727e855
Gitweb:        https://git.kernel.org/tip/c330ef2847eeedfa9d06f03836dfd4fc6727e855
Author:        Arnaldo Carvalho de Melo <acme@...hat.com>
AuthorDate:    Mon, 07 Oct 2019 15:54:51 -03:00
Committer:     Arnaldo Carvalho de Melo <acme@...hat.com>
CommitterDate: Wed, 09 Oct 2019 11:23:52 -03:00

perf trace: Associate the "msr" tracepoint arg name with x86_MSR__scnprintf()

So that we can go from:

  # perf trace -e msr:write_msr --max-stack=16 sleep 1
       0.000 sleep/6740 msr:write_msr(msr: 3221225728, val: 139636317451648)
                                         do_trace_write_msr ([kernel.kallsyms])
                                         do_trace_write_msr ([kernel.kallsyms])
                                         do_arch_prctl_64 ([kernel.kallsyms])
                                         __x64_sys_arch_prctl ([kernel.kallsyms])
                                         do_syscall_64 ([kernel.kallsyms])
                                         entry_SYSCALL_64 ([kernel.kallsyms])
                                         init_tls (/usr/lib64/ld-2.29.so)
                                         dl_main (/usr/lib64/ld-2.29.so)
                                         _dl_sysdep_start (/usr/lib64/ld-2.29.so)
                                         _dl_start (/usr/lib64/ld-2.29.so)
  #

To:

  # perf trace -e msr:write_msr --max-stack=16 sleep 1
     0.000 sleep/8519 msr:write_msr(msr: FS_BASE, val: 139878031705472)
                                       do_trace_write_msr ([kernel.kallsyms])
                                       do_trace_write_msr ([kernel.kallsyms])
                                       do_arch_prctl_64 ([kernel.kallsyms])
                                       __x64_sys_arch_prctl ([kernel.kallsyms])
                                       do_syscall_64 ([kernel.kallsyms])
                                       entry_SYSCALL_64 ([kernel.kallsyms])
                                       init_tls (/usr/lib64/ld-2.29.so)
                                       dl_main (/usr/lib64/ld-2.29.so)
                                       _dl_sysdep_start (/usr/lib64/ld-2.29.so)
                                       _dl_start (/usr/lib64/ld-2.29.so)
  #

This, in reverse, will allow for symbolic system call/tracepoint
filtering.

Cc: Adrian Hunter <adrian.hunter@...el.com>
Cc: Brendan Gregg <brendan.d.gregg@...il.com>
Cc: Jiri Olsa <jolsa@...nel.org>
Cc: Luis Cláudio Gonçalves <lclaudio@...hat.com>
Cc: Namhyung Kim <namhyung@...nel.org>
Link: https://lkml.kernel.org/n/tip-q1q4unmqja5ex7dy0kb5cjaa@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/builtin-trace.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/tools/perf/builtin-trace.c b/tools/perf/builtin-trace.c
index d52972c..e9f132a 100644
--- a/tools/perf/builtin-trace.c
+++ b/tools/perf/builtin-trace.c
@@ -1480,6 +1480,7 @@ static int syscall__alloc_arg_fmts(struct syscall *sc, int nr_args)
 }
 
 static struct syscall_arg_fmt syscall_arg_fmts__by_name[] = {
+	{ .name = "msr", .scnprintf = SCA_X86_MSR, }
 };
 
 static int syscall_arg_fmt__cmp(const void *name, const void *fmtp)