linux-kernel - [tip: perf/core] perf augmented_raw_syscalls: Postpone tmp map lookup to after pid

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Date:   Tue, 27 Aug 2019 08:26:15 -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>,
        Jiri Olsa <jolsa@...nel.org>,
        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 augmented_raw_syscalls: Postpone tmp map lookup
 to after pid_filter

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

Commit-ID:     01128065ca5112123e6992dc0522484349c6ced7
Gitweb:        https://git.kernel.org/tip/01128065ca5112123e6992dc0522484349c6ced7
Author:        Arnaldo Carvalho de Melo <acme@...hat.com>
AuthorDate:    Fri, 23 Aug 2019 15:38:08 -03:00
Committer:     Arnaldo Carvalho de Melo <acme@...hat.com>
CommitterDate: Mon, 26 Aug 2019 11:58:29 -03:00

perf augmented_raw_syscalls: Postpone tmp map lookup to after pid_filter

No sense in doing that lookup before figuring out if it will be used,
i.e. if the pid is being filtered that tmp space lookup will be useless.

Cc: Adrian Hunter <adrian.hunter@...el.com>
Cc: Jiri Olsa <jolsa@...nel.org>
Cc: Namhyung Kim <namhyung@...nel.org>
Link: https://lkml.kernel.org/n/tip-o74yggieorucfg4j74tb6rta@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/examples/bpf/augmented_raw_syscalls.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/tools/perf/examples/bpf/augmented_raw_syscalls.c b/tools/perf/examples/bpf/augmented_raw_syscalls.c
index b85b177..0a8d217 100644
--- a/tools/perf/examples/bpf/augmented_raw_syscalls.c
+++ b/tools/perf/examples/bpf/augmented_raw_syscalls.c
@@ -250,13 +250,13 @@ int sys_enter(struct syscall_enter_args *args)
 	struct syscall *syscall;
 	int key = 0;
 
+	if (pid_filter__has(&pids_filtered, getpid()))
+		return 0;
+
         augmented_args = bpf_map_lookup_elem(&augmented_args_tmp, &key);
         if (augmented_args == NULL)
                 return 1;
 
-	if (pid_filter__has(&pids_filtered, getpid()))
-		return 0;
-
 	probe_read(&augmented_args->args, sizeof(augmented_args->args), args);
 
 	/*