diff options
| author | Arnaldo Carvalho de Melo <acme@redhat.com> | 2018-08-30 12:32:35 -0300 |
|---|---|---|
| committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2018-08-30 15:52:21 -0300 |
| commit | f5b076dc01e77fa016de8439f8ac21d1c310c5be (patch) | |
| tree | 878b07619a6a3e9a4af3beaf9c5e493e2f3f7e87 /tools/perf/examples | |
| parent | 4c8f0a726ef808244788a237e52ce3c612bff8c3 (diff) | |
perf trace augmented_syscalls: Hook into syscalls:sys_exit_SYSCALL too
Hook the pair enter/exit when using augmented_{filename,sockaddr,etc}_syscall(),
this way we'll be able to see what entries are in the ELF sections generated
from augmented_syscalls.c and filter them out from the main raw_syscalls:*
tracepoints used by 'perf trace'.
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Wang Nan <wangnan0@huawei.com>
Link: https://lkml.kernel.org/n/tip-cyav42qj5yylolw4attcw99z@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/perf/examples')
| -rw-r--r-- | tools/perf/examples/bpf/augmented_syscalls.c | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/tools/perf/examples/bpf/augmented_syscalls.c b/tools/perf/examples/bpf/augmented_syscalls.c index 253b3ccbd17d..1419a9186937 100644 --- a/tools/perf/examples/bpf/augmented_syscalls.c +++ b/tools/perf/examples/bpf/augmented_syscalls.c @@ -26,6 +26,12 @@ struct bpf_map SEC("maps") __augmented_syscalls__ = { .max_entries = __NR_CPUS__, }; +struct syscall_exit_args { + unsigned long long common_tp_fields; + long syscall_nr; + long ret; +}; + struct augmented_filename { int size; int reserved; @@ -49,6 +55,10 @@ int syscall_enter(syscall)(struct syscall_enter_##syscall##_args *args) \ (sizeof(augmented_args) - sizeof(augmented_args.filename.value) + \ augmented_args.filename.size)); \ return 0; \ +} \ +int syscall_exit(syscall)(struct syscall_exit_args *args) \ +{ \ + return 1; /* 0 as soon as we start copying data returned by the kernel, e.g. 'read' */ \ } struct syscall_enter_openat_args { @@ -116,6 +126,10 @@ int syscall_enter(syscall)(struct syscall_enter_##syscall##_args *args) \ &augmented_args, \ sizeof(augmented_args) - sizeof(augmented_args.addr) + addrlen); \ return 0; \ +} \ +int syscall_exit(syscall)(struct syscall_exit_args *args) \ +{ \ + return 1; /* 0 as soon as we start copying data returned by the kernel, e.g. 'read' */ \ } struct sockaddr; |