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Subject[PATCH 24/77] perf trace augmented_syscalls: Hook into syscalls:sys_exit_SYSCALL too
Date
From: Arnaldo Carvalho de Melo <acme@redhat.com>

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>
---
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;
--
2.14.4
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