Commit-ID: f5b076dc01e77fa016de8439f8ac21d1c310c5be
Gitweb: https://git.kernel.org/tip/f5b076dc01e77fa016de8439f8ac21d1c310c5be
Author: Arnaldo Carvalho de Melo <[email protected]>
AuthorDate: Thu, 30 Aug 2018 12:32:35 -0300
Committer: Arnaldo Carvalho de Melo <[email protected]>
CommitDate: Thu, 30 Aug 2018 15:52:21 -0300
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 <[email protected]>
Cc: David Ahern <[email protected]>
Cc: Jiri Olsa <[email protected]>
Cc: Namhyung Kim <[email protected]>
Cc: Wang Nan <[email protected]>
Link: https://lkml.kernel.org/n/[email protected]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>
---
tools/perf/examples/bpf/augmented_syscalls.c | 14 ++++++++++++++
1 file changed, 14 insertions(+)
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;
