lkml.org 
[lkml]   [2019]   [Jun]   [17]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
Date
From
Subject[tip:perf/core] perf augmented_raw_syscalls: Move the probe_read_str to a separate function
Commit-ID:  0c95a7ff76fb1c5bb614e6ee438fce06d1b957c8
Gitweb: https://git.kernel.org/tip/0c95a7ff76fb1c5bb614e6ee438fce06d1b957c8
Author: Arnaldo Carvalho de Melo <acme@redhat.com>
AuthorDate: Tue, 4 Jun 2019 15:31:28 -0300
Committer: Arnaldo Carvalho de Melo <acme@redhat.com>
CommitDate: Wed, 5 Jun 2019 09:47:58 -0300

perf augmented_raw_syscalls: Move the probe_read_str to a separate function

One more step into copying multiple filenames to support syscalls like
rename*.

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Brendan Gregg <brendan.d.gregg@gmail.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Luis Cláudio Gonçalves <lclaudio@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Link: https://lkml.kernel.org/n/tip-xdqtjexdyp81oomm1rkzeifl@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
tools/perf/examples/bpf/augmented_raw_syscalls.c | 27 ++++++++++++++++--------
1 file changed, 18 insertions(+), 9 deletions(-)

diff --git a/tools/perf/examples/bpf/augmented_raw_syscalls.c b/tools/perf/examples/bpf/augmented_raw_syscalls.c
index c9fd3b4d8e55..356513e81ec1 100644
--- a/tools/perf/examples/bpf/augmented_raw_syscalls.c
+++ b/tools/perf/examples/bpf/augmented_raw_syscalls.c
@@ -60,11 +60,27 @@ struct augmented_args_filename {

bpf_map(augmented_filename_map, PERCPU_ARRAY, int, struct augmented_args_filename, 1);

+static inline
+unsigned int augmented_args__read_filename(struct augmented_args_filename *augmented_args,
+ const void *filename_arg, unsigned int filename_len)
+{
+ unsigned int len = sizeof(*augmented_args);
+
+ augmented_args->filename.reserved = 0;
+ augmented_args->filename.size = probe_read_str(&augmented_args->filename.value, filename_len, filename_arg);
+ if (augmented_args->filename.size < sizeof(augmented_args->filename.value)) {
+ len -= sizeof(augmented_args->filename.value) - augmented_args->filename.size;
+ len &= sizeof(augmented_args->filename.value) - 1;
+ }
+
+ return len;
+}
+
SEC("raw_syscalls:sys_enter")
int sys_enter(struct syscall_enter_args *args)
{
struct augmented_args_filename *augmented_args;
- unsigned int len = sizeof(*augmented_args), filename_len;
+ unsigned int len, filename_len;
const void *filename_arg = NULL;
struct syscall *syscall;
int key = 0;
@@ -182,14 +198,7 @@ processed 46 insns (limit 1000000) max_states_per_insn 0 total_states 12 peak_st
loop_iter_last(5)

if (filename_arg != NULL && filename_len <= sizeof(augmented_args->filename.value)) {
- augmented_args->filename.reserved = 0;
- augmented_args->filename.size = probe_read_str(&augmented_args->filename.value,
- filename_len,
- filename_arg);
- if (augmented_args->filename.size < sizeof(augmented_args->filename.value)) {
- len -= sizeof(augmented_args->filename.value) - augmented_args->filename.size;
- len &= sizeof(augmented_args->filename.value) - 1;
- }
+ len = augmented_args__read_filename(augmented_args, filename_arg, filename_len);
} else {
len = sizeof(augmented_args->args);
}
\
 
 \ /
  Last update: 2019-06-17 21:14    [W:0.035 / U:0.500 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site