From 9779fc021410e7d8433d923a2202dac7e1384b05 Mon Sep 17 00:00:00 2001 From: Arnaldo Carvalho de Melo Date: Tue, 21 Aug 2018 13:21:36 -0300 Subject: [PATCH] perf trace: Augment inotify_add_watch pathname syscall arg Again, just changing tools/perf/examples/bpf/augmented_syscalls.c, that is starting to have too much boilerplate, some macro will come to the rescue. # perf trace -e tools/perf/examples/bpf/augmented_syscalls.c 0.000 gmain/2590 inotify_add_watch(fd: 3, pathname: /var/cache/app-info/yaml, mask: 16789454) 0.023 gmain/2590 inotify_add_watch(fd: 3, pathname: /var/lib/app-info/xmls, mask: 16789454) 0.028 gmain/2590 inotify_add_watch(fd: 3, pathname: /var/lib/app-info/yaml, mask: 16789454) 0.032 gmain/2590 inotify_add_watch(fd: 3, pathname: /usr/share/app-info/yaml, mask: 16789454) 0.039 gmain/2590 inotify_add_watch(fd: 3, pathname: /usr/local/share/app-info/xmls, mask: 16789454) 0.045 gmain/2590 inotify_add_watch(fd: 3, pathname: /usr/local/share/app-info/yaml, mask: 16789454) 0.049 gmain/2590 inotify_add_watch(fd: 3, pathname: /home/acme/.local/share/app-info/yaml, mask: 16789454) 0.056 gmain/2590 inotify_add_watch(fd: 3, pathname: , mask: 16789454) 0.010 gmain/2245 inotify_add_watch(fd: 7, pathname: /home/acme/~, mask: 16789454) 0.087 perf/20116 openat(dfd: CWD, filename: /sys/kernel/debug/tracing/events/syscalls/sys_enter_inotify_add) 0.436 perf/20116 openat(dfd: CWD, filename: /sys/kernel/debug/tracing/events/syscalls/sys_enter_openat/form) 56.042 gmain/2791 inotify_add_watch(fd: 4, pathname: /var/lib/fwupd/remotes.d/lvfs-testing, mask: 16789454) 113.986 gmain/1721 inotify_add_watch(fd: 3, pathname: /var/lib/gdm/~, mask: 16789454) 3777.265 gsd-color/2408 openat(dfd: CWD, filename: /etc/localtime) 3777.550 gsd-color/2408 openat(dfd: CWD, filename: /etc/localtime) ^C[root@jouet perf]# Still not combining raw_syscalls:sys_enter + raw_syscalls:sys_exit, to get it strace-like, but that probably will come very naturally with some more wiring up... Cc: Adrian Hunter Cc: David Ahern Cc: Jiri Olsa Cc: Namhyung Kim Cc: Wang Nan Link: https://lkml.kernel.org/n/tip-ol83juin2cht9vzquynec5hz@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo --- tools/perf/examples/bpf/augmented_syscalls.c | 27 ++++++++++++++++++++ 1 file changed, 27 insertions(+) diff --git a/tools/perf/examples/bpf/augmented_syscalls.c b/tools/perf/examples/bpf/augmented_syscalls.c index 154379463c95..6ec327850a15 100644 --- a/tools/perf/examples/bpf/augmented_syscalls.c +++ b/tools/perf/examples/bpf/augmented_syscalls.c @@ -88,4 +88,31 @@ int syscall_enter(open)(struct syscall_enter_open_args *args) return 0; } +struct syscall_enter_inotify_add_watch_args { + unsigned long long common_tp_fields; + long syscall_nr; + long fd; + char *pathname_ptr; + long mask; +}; + +struct augmented_enter_inotify_add_watch_args { + struct syscall_enter_inotify_add_watch_args args; + struct augmented_filename pathname; +}; + +int syscall_enter(inotify_add_watch)(struct syscall_enter_inotify_add_watch_args *args) +{ + struct augmented_enter_inotify_add_watch_args augmented_args = { .pathname.reserved = 0, }; + + probe_read(&augmented_args.args, sizeof(augmented_args.args), args); + augmented_args.pathname.size = probe_read_str(&augmented_args.pathname.value, + sizeof(augmented_args.pathname.value), + args->pathname_ptr); + perf_event_output(args, &__augmented_syscalls__, BPF_F_CURRENT_CPU, + &augmented_args, + sizeof(augmented_args) - sizeof(augmented_args.pathname.value) + augmented_args.pathname.size); + return 0; +} + license(GPL); -- 2.30.2