diff options
Diffstat (limited to 'tools/perf')
| -rw-r--r-- | tools/perf/examples/bpf/5sec.c | 10 | ||||
| -rw-r--r-- | tools/perf/include/bpf/bpf.h | 3 |
2 files changed, 11 insertions, 2 deletions
diff --git a/tools/perf/examples/bpf/5sec.c b/tools/perf/examples/bpf/5sec.c index 6fc3697ac749..b9c203219691 100644 --- a/tools/perf/examples/bpf/5sec.c +++ b/tools/perf/examples/bpf/5sec.c @@ -15,6 +15,13 @@ . While this is running, run something like "sleep 5s". + . If we decide to add tv_nsec as well, then it becomes: + + int probe(hrtimer_nanosleep, rqtp->tv_sec rqtp->tv_nsec)(void *ctx, int err, long sec, long nsec) + + I.e. add where it comes from (rqtp->tv_nsec) and where it will be + accessible in the function body (nsec) + # perf trace --no-syscalls -e tools/perf/examples/bpf/5sec.c/call-graph=dwarf/ 0.000 perf_bpf_probe:func:(ffffffff9811b5f0) tv_sec=5 hrtimer_nanosleep ([kernel.kallsyms]) @@ -34,8 +41,7 @@ #include <bpf.h> -SEC("func=hrtimer_nanosleep rqtp->tv_sec") -int func(void *ctx, int err, long sec) +int probe(hrtimer_nanosleep, rqtp->tv_sec)(void *ctx, int err, long sec) { return sec == 5; } diff --git a/tools/perf/include/bpf/bpf.h b/tools/perf/include/bpf/bpf.h index cdfd18b9c318..dd764ad5efdf 100644 --- a/tools/perf/include/bpf/bpf.h +++ b/tools/perf/include/bpf/bpf.h @@ -3,6 +3,9 @@ #define _PERF_BPF_H #define SEC(NAME) __attribute__((section(NAME), used)) +#define probe(function, vars) \ + SEC(#function "=" #function " " #vars) function + #define license(name) \ char _license[] SEC("license") = #name; \ int _version SEC("version") = LINUX_VERSION_CODE; |