mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-09-13 14:14:37 +00:00
27702bcfe8
So now we can use:
# perf trace -e pkey_*
532.784 ( 0.006 ms): pkey/16018 pkey_alloc(init_val: DISABLE_WRITE) = -1 EINVAL Invalid argument
532.795 ( 0.004 ms): pkey/16018 pkey_mprotect(start: 0x7f380d0a6000, len: 4096, prot: READ|WRITE, pkey: -1) = 0
532.801 ( 0.002 ms): pkey/16018 pkey_free(pkey: -1 ) = -1 EINVAL Invalid argument
^C[root@jouet ~]#
Or '-e epoll*', '-e *msg*', etc.
Combining syscall names with perf events, tracepoints, etc, continues to
be valid, i.e. this is possible:
# perf probe -L sys_nanosleep
<SyS_nanosleep@/home/acme/git/linux/kernel/time/hrtimer.c:0>
0 SYSCALL_DEFINE2(nanosleep, struct timespec __user *, rqtp,
struct timespec __user *, rmtp)
{
struct timespec64 tu;
5 if (get_timespec64(&tu, rqtp))
6 return -EFAULT;
if (!timespec64_valid(&tu))
9 return -EINVAL;
11 current->restart_block.nanosleep.type = rmtp ? TT_NATIVE : TT_NONE;
12 current->restart_block.nanosleep.rmtp = rmtp;
13 return hrtimer_nanosleep(&tu, HRTIMER_MODE_REL, CLOCK_MONOTONIC);
}
# perf probe my_probe="sys_nanosleep:12 rmtp"
Added new event:
probe:my_probe (on sys_nanosleep:12 with rmtp)
You can now use it in all perf tools, such as:
perf record -e probe:my_probe -aR sleep 1
#
# perf trace -e probe:my_probe/max-stack=5/,*sleep sleep 1
0.427 ( 0.003 ms): sleep/16690 nanosleep(rqtp: 0x7ffefc245090) ...
0.430 ( ): probe:my_probe:(ffffffffbd112923) rmtp=0)
sys_nanosleep ([kernel.kallsyms])
do_syscall_64 ([kernel.kallsyms])
return_from_SYSCALL_64 ([kernel.kallsyms])
__nanosleep_nocancel (/usr/lib64/libc-2.25.so)
0.427 (1000.208 ms): sleep/16690 ... [continued]: nanosleep()) = 0
#
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Wang Nan <wangnan0@huawei.com>
Link: http://lkml.kernel.org/n/tip-elycoi8wy6y0w9dkj7ox1mzz@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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