Arnaldo Carvalho de Melo febf8a3712 perf examples bpf: Start augmenting raw_syscalls:sys_{start,exit} ... The previous approach of attaching to each syscall showed how it is possible to augment tracepoints and use that augmentation, pointer payloads, in the existing beautifiers in 'perf trace', but for a more general solution we now will try to augment the main raw_syscalls:sys_{enter,exit} syscalls, and then pass instructions in maps so that it knows which syscalls and which pointer contents, and how many bytes for each of the arguments should be copied. Start with just the bare minimum to collect what is provided by those two tracepoints via the __augmented_syscalls__ map + bpf-output perf event, which results in perf trace showing them without connecting enter+exit: # perf trace -e tools/perf/examples/bpf/augmented_raw_syscalls.c sleep 1 0.000 sleep/11563 raw_syscalls:sys_exit:NR 59 = 0 0.019 ( ): sleep/11563 brk() ... 0.021 sleep/11563 raw_syscalls:sys_exit:NR 12 = 94682642325504 0.033 ( ): sleep/11563 access(filename:, mode: R) ... 0.037 sleep/11563 raw_syscalls:sys_exit:NR 21 = -2 0.041 ( ): sleep/11563 openat(dfd: CWD, filename: , flags: CLOEXEC) ... 0.044 sleep/11563 raw_syscalls:sys_exit:NR 257 = 3 0.045 ( ): sleep/11563 fstat(fd: 3, statbuf: 0x7ffdbf7119b0) ... 0.046 sleep/11563 raw_syscalls:sys_exit:NR 5 = 0 0.047 ( ): sleep/11563 mmap(len: 103334, prot: READ, flags: PRIVATE, fd: 3) ... 0.049 sleep/11563 raw_syscalls:sys_exit:NR 9 = 140196285493248 0.050 ( ): sleep/11563 close(fd: 3) ... 0.051 sleep/11563 raw_syscalls:sys_exit:NR 3 = 0 0.059 ( ): sleep/11563 openat(dfd: CWD, filename: , flags: CLOEXEC) ... 0.062 sleep/11563 raw_syscalls:sys_exit:NR 257 = 3 0.063 ( ): sleep/11563 read(fd: 3, buf: 0x7ffdbf711b78, count: 832) ... 0.065 sleep/11563 raw_syscalls:sys_exit:NR 0 = 832 0.066 ( ): sleep/11563 fstat(fd: 3, statbuf: 0x7ffdbf711a10) ... 0.067 sleep/11563 raw_syscalls:sys_exit:NR 5 = 0 0.068 ( ): sleep/11563 mmap(len: 8192, prot: READ|WRITE, flags: PRIVATE|ANONYMOUS) ... 0.070 sleep/11563 raw_syscalls:sys_exit:NR 9 = 140196285485056 0.073 ( ): sleep/11563 mmap(len: 3889792, prot: EXEC|READ, flags: PRIVATE|DENYWRITE, fd: 3) ... 0.076 sleep/11563 raw_syscalls:sys_exit:NR 9 = 140196279463936 0.077 ( ): sleep/11563 mprotect(start: 0x7f81fd8a8000, len: 2093056) ... 0.083 sleep/11563 raw_syscalls:sys_exit:NR 10 = 0 0.084 ( ): sleep/11563 mmap(addr: 0x7f81fdaa7000, len: 24576, prot: READ|WRITE, flags: PRIVATE|FIXED|DENYWRITE, fd: 3, off: 1753088) ... 0.088 sleep/11563 raw_syscalls:sys_exit:NR 9 = 140196283314176 0.091 ( ): sleep/11563 mmap(addr: 0x7f81fdaad000, len: 14976, prot: READ|WRITE, flags: PRIVATE|FIXED|ANONYMOUS) ... 0.093 sleep/11563 raw_syscalls:sys_exit:NR 9 = 140196283338752 0.097 ( ): sleep/11563 close(fd: 3) ... 0.098 sleep/11563 raw_syscalls:sys_exit:NR 3 = 0 0.107 ( ): sleep/11563 arch_prctl(option: 4098, arg2: 140196285490432) ... 0.108 sleep/11563 raw_syscalls:sys_exit:NR 158 = 0 0.143 ( ): sleep/11563 mprotect(start: 0x7f81fdaa7000, len: 16384, prot: READ) ... 0.146 sleep/11563 raw_syscalls:sys_exit:NR 10 = 0 0.157 ( ): sleep/11563 mprotect(start: 0x561d037e7000, len: 4096, prot: READ) ... 0.160 sleep/11563 raw_syscalls:sys_exit:NR 10 = 0 0.163 ( ): sleep/11563 mprotect(start: 0x7f81fdcd5000, len: 4096, prot: READ) ... 0.165 sleep/11563 raw_syscalls:sys_exit:NR 10 = 0 0.166 ( ): sleep/11563 munmap(addr: 0x7f81fdcbb000, len: 103334) ... 0.174 sleep/11563 raw_syscalls:sys_exit:NR 11 = 0 0.216 ( ): sleep/11563 brk() ... 0.217 sleep/11563 raw_syscalls:sys_exit:NR 12 = 94682642325504 0.217 ( ): sleep/11563 brk(brk: 0x561d05453000) ... 0.219 sleep/11563 raw_syscalls:sys_exit:NR 12 = 94682642460672 0.220 ( ): sleep/11563 brk() ... 0.221 sleep/11563 raw_syscalls:sys_exit:NR 12 = 94682642460672 0.224 ( ): sleep/11563 open(filename: , flags: CLOEXEC) ... 0.228 sleep/11563 raw_syscalls:sys_exit:NR 2 = 3 0.229 ( ): sleep/11563 fstat(fd: 3, statbuf: 0x7f81fdaacaa0) ... 0.230 sleep/11563 raw_syscalls:sys_exit:NR 5 = 0 0.231 ( ): sleep/11563 mmap(len: 113045344, prot: READ, flags: PRIVATE, fd: 3) ... 0.234 sleep/11563 raw_syscalls:sys_exit:NR 9 = 140196166418432 0.237 ( ): sleep/11563 close(fd: 3) ... 0.238 sleep/11563 raw_syscalls:sys_exit:NR 3 = 0 0.262 ( ): sleep/11563 nanosleep(rqtp: 0x7ffdbf7126f0) ... 1000.399 sleep/11563 raw_syscalls:sys_exit:NR 35 = 0 1000.440 ( ): sleep/11563 close(fd: 1) ... 1000.447 sleep/11563 raw_syscalls:sys_exit:NR 3 = 0 1000.454 ( ): sleep/11563 close(fd: 2) ... 1000.468 ( ): sleep/11563 exit_group( ) # In the next csets we'll connect those events to the existing enter/exit raw_syscalls handlers in 'perf trace', just like we did with the syscalls:sys_{enter,exit}_* tracepoints. 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-5nl8l4hx1tl9pqdx65nkp6pw@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>		2018-11-01 14:11:45 -03:00
..
5sec.c	perf bpf: Add probe() helper to reduce kprobes boilerplate	2018-05-15 14:31:24 -03:00
augmented_raw_syscalls.c	perf examples bpf: Start augmenting raw_syscalls:sys_{start,exit}	2018-11-01 14:11:45 -03:00
augmented_syscalls.c	perf augmented_syscalls: Avoid optimization to pass older BPF validators	2018-09-03 15:29:53 -03:00
empty.c	perf bpf: Add license(NAME) helper	2018-05-15 14:31:24 -03:00
etcsnoop.c	perf trace: Add a etcsnoop.c augmented syscalls eBPF utility	2018-08-30 15:52:19 -03:00
hello.c	perf bpf: Add bpf/stdio.h wrapper to bpf_perf_event_output function	2018-08-08 15:55:55 -03:00
sys_enter_openat.c	perf bpf: Add 'syscall_enter' probe helper for syscall enter tracepoints	2018-08-08 15:55:44 -03:00