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authorArnaldo Carvalho de Melo <acme@redhat.com>2018-12-12 22:46:13 +0300
committerArnaldo Carvalho de Melo <acme@redhat.com>2018-12-18 18:23:58 +0300
commit27f2992e7bb12ca28e886e48838ba740d2eb95f4 (patch)
tree4b2582b7a0ff006717ec9e023f3e08f51348770b /tools/perf/examples/bpf
parent61d007138a44dc69265cf948eadd1759edbd3875 (diff)
downloadlinux-27f2992e7bb12ca28e886e48838ba740d2eb95f4.tar.xz
perf augmented_syscalls: Switch to using a struct for the syscalls map values
We'll start adding more perf-syscall stuff, so lets do this prep step so that the next ones are just about adding more fields. Run it with the .c file once to cache the .o file: # trace --filter-pids 2834,2199 -e openat,augmented_raw_syscalls.c LLVM: dumping augmented_raw_syscalls.o 0.000 ( 0.021 ms): tmux: server/4952 openat(dfd: CWD, filename: /proc/5691/cmdline ) = 11 349.807 ( 0.040 ms): DNS Res~er #39/11082 openat(dfd: CWD, filename: /etc/hosts, flags: CLOEXEC ) = 44 4988.759 ( 0.052 ms): gsd-color/2431 openat(dfd: CWD, filename: /etc/localtime ) = 18 4988.976 ( 0.029 ms): gsd-color/2431 openat(dfd: CWD, filename: /etc/localtime ) = 18 ^C[root@quaco bpf]# From now on, we can use just the newly built .o file, skipping the compilation step for a faster startup: # trace --filter-pids 2834,2199 -e openat,augmented_raw_syscalls.o 0.000 ( 0.046 ms): DNS Res~er #39/11088 openat(dfd: CWD, filename: /etc/hosts, flags: CLOEXEC ) = 44 1946.408 ( 0.190 ms): systemd/1 openat(dfd: CWD, filename: /proc/1071/cgroup, flags: CLOEXEC ) = 20 1946.792 ( 0.215 ms): systemd/1 openat(dfd: CWD, filename: /proc/954/cgroup, flags: CLOEXEC ) = 20 ^C# Now on to do the same in the builtin-trace.c side of things. Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Namhyung Kim <namhyung@kernel.org> Link: https://lkml.kernel.org/n/tip-k8mwu04l8es29rje5loq9vg7@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/perf/examples/bpf')
-rw-r--r--tools/perf/examples/bpf/augmented_raw_syscalls.c18
1 files changed, 11 insertions, 7 deletions
diff --git a/tools/perf/examples/bpf/augmented_raw_syscalls.c b/tools/perf/examples/bpf/augmented_raw_syscalls.c
index bb3dcc4ec256..a91c5874433e 100644
--- a/tools/perf/examples/bpf/augmented_raw_syscalls.c
+++ b/tools/perf/examples/bpf/augmented_raw_syscalls.c
@@ -26,10 +26,14 @@ struct bpf_map SEC("maps") __augmented_syscalls__ = {
.max_entries = __NR_CPUS__,
};
+struct syscall {
+ bool enabled;
+};
+
struct bpf_map SEC("maps") syscalls = {
.type = BPF_MAP_TYPE_ARRAY,
.key_size = sizeof(int),
- .value_size = sizeof(bool),
+ .value_size = sizeof(struct syscall),
.max_entries = 512,
};
@@ -63,7 +67,7 @@ int sys_enter(struct syscall_enter_args *args)
struct syscall_enter_args args;
struct augmented_filename filename;
} augmented_args;
- bool *enabled;
+ struct syscall *syscall;
unsigned int len = sizeof(augmented_args);
const void *filename_arg = NULL;
@@ -72,8 +76,8 @@ int sys_enter(struct syscall_enter_args *args)
probe_read(&augmented_args.args, sizeof(augmented_args.args), args);
- enabled = bpf_map_lookup_elem(&syscalls, &augmented_args.args.syscall_nr);
- if (enabled == NULL || !*enabled)
+ syscall = bpf_map_lookup_elem(&syscalls, &augmented_args.args.syscall_nr);
+ if (syscall == NULL || !syscall->enabled)
return 0;
/*
* Yonghong and Edward Cree sayz:
@@ -144,15 +148,15 @@ SEC("raw_syscalls:sys_exit")
int sys_exit(struct syscall_exit_args *args)
{
struct syscall_exit_args exit_args;
- bool *enabled;
+ struct syscall *syscall;
if (pid_filter__has(&pids_filtered, getpid()))
return 0;
probe_read(&exit_args, sizeof(exit_args), args);
- enabled = bpf_map_lookup_elem(&syscalls, &exit_args.syscall_nr);
- if (enabled == NULL || !*enabled)
+ syscall = bpf_map_lookup_elem(&syscalls, &exit_args.syscall_nr);
+ if (syscall == NULL || !syscall->enabled)
return 0;
return 1;