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perf trace: Introduce augmented_filename_syscall_enter() declarator

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Helping with tons of boilerplate for syscalls that only want to augment
a filename. Now supporting one such syscall is just a matter of
declaring its arguments struct + using:

  augmented_filename_syscall_enter(openat);

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-ls7ojdseu8fxw7fvj77ejpao@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Arnaldo Carvalho de Melo 2018-08-21 13:44:49 -03:00
parent 9779fc0214
commit f6618ce6c0
1 changed files with 23 additions and 55 deletions
Download patch file Download diff file Expand all files Collapse all files

78
tools/perf/examples/bpf/augmented_syscalls.c
View file

@ -33,6 +33,25 @@ struct augmented_filename {
char value[256]; char value[256];
}; };
#define augmented_filename_syscall_enter(syscall) \
struct augmented_enter_##syscall##_args { \
struct syscall_enter_##syscall##_args args; \
struct augmented_filename filename; \
}; \
int syscall_enter(syscall)(struct syscall_enter_##syscall##_args *args) \
{ \
struct augmented_enter_##syscall##_args augmented_args = { .filename.reserved = 0, }; \
probe_read(&augmented_args.args, sizeof(augmented_args.args), args); \
augmented_args.filename.size = probe_read_str(&augmented_args.filename.value, \
sizeof(augmented_args.filename.value), \
args->filename_ptr); \
perf_event_output(args, &__augmented_syscalls__, BPF_F_CURRENT_CPU, \
&augmented_args, \
(sizeof(augmented_args) - sizeof(augmented_args.filename.value) + \
augmented_args.filename.size)); \
return 0; \
}
struct syscall_enter_openat_args { struct syscall_enter_openat_args {
unsigned long long common_tp_fields; unsigned long long common_tp_fields;
long syscall_nr; long syscall_nr;
@ -42,24 +61,7 @@ struct syscall_enter_openat_args {
long mode; long mode;
}; };
struct augmented_enter_openat_args { augmented_filename_syscall_enter(openat);
struct syscall_enter_openat_args args;
struct augmented_filename filename;
};
int syscall_enter(openat)(struct syscall_enter_openat_args *args)
{
struct augmented_enter_openat_args augmented_args = { .filename.reserved = 0, };
probe_read(&augmented_args.args, sizeof(augmented_args.args), args);
augmented_args.filename.size = probe_read_str(&augmented_args.filename.value,
sizeof(augmented_args.filename.value),
args->filename_ptr);
perf_event_output(args, &__augmented_syscalls__, BPF_F_CURRENT_CPU,
&augmented_args,
sizeof(augmented_args) - sizeof(augmented_args.filename.value) + augmented_args.filename.size);
return 0;
}
struct syscall_enter_open_args { struct syscall_enter_open_args {
unsigned long long common_tp_fields; unsigned long long common_tp_fields;
@ -69,50 +71,16 @@ struct syscall_enter_open_args {
long mode; long mode;
}; };
struct augmented_enter_open_args { augmented_filename_syscall_enter(open);
struct syscall_enter_open_args args;
struct augmented_filename filename;
};
int syscall_enter(open)(struct syscall_enter_open_args *args)
{
struct augmented_enter_open_args augmented_args = { .filename.reserved = 0, };
probe_read(&augmented_args.args, sizeof(augmented_args.args), args);
augmented_args.filename.size = probe_read_str(&augmented_args.filename.value,
sizeof(augmented_args.filename.value),
args->filename_ptr);
perf_event_output(args, &__augmented_syscalls__, BPF_F_CURRENT_CPU,
&augmented_args,
sizeof(augmented_args) - sizeof(augmented_args.filename.value) + augmented_args.filename.size);
return 0;
}
struct syscall_enter_inotify_add_watch_args { struct syscall_enter_inotify_add_watch_args {
unsigned long long common_tp_fields; unsigned long long common_tp_fields;
long syscall_nr; long syscall_nr;
long fd; long fd;
char *pathname_ptr; char *filename_ptr;
long mask; long mask;
}; };
struct augmented_enter_inotify_add_watch_args { augmented_filename_syscall_enter(inotify_add_watch);
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); license(GPL);