Em Tue, Apr 17, 2018 at 02:29:40PM -0300, Arnaldo Carvalho de Melo escreveu:
> Em Tue, Apr 17, 2018 at 01:07:02PM -0400, Steven Rostedt escreveu:
> > Because the x86 system calls had "__x64_" appended to the "sys" for the
> > names, they do not match the default compare algorithm. As this was a
> > problem for power pc, the algorithm can be overwritten by the architecture.
> > The solution is to have x86 have its own algorithm to do the compare and
> > this brings back the system call trace events.
> > Reported-by: Arnaldo Carvalho de Melo <a...@redhat.com>
> > Fixes: d5a00528b58c ("syscalls/core, syscalls/x86: Rename struct
> > pt_regs-based sys_*() to __x64_sys_*()")
> > Signed-off-by: Steven Rostedt (VMware) <rost...@goodmis.org>
> Tested-by: Arnaldo Carvalho de Melo <a...@redhat.com>
> Again on x86_64, the number of files in
> /sys/kernel/debug/tracing/events/syscalls/ is the same, all my perf
> related tests pass.
>
> Now to the next seemingly kernel related test failure, unrelated to
> this:
>
> 4: Read samples using the mmap interface : FAILED!
Ok, I take that back, it is related:
[root@jouet perf]# perf test -F -v "mmap interface" |& grep -v plugins
4: Read samples using the mmap interface :
--- start ---
perf_evsel__new(sys_enter_getppid)
---- end ----
Read samples using the mmap interface: FAILED!
[root@jouet perf]#
[root@jouet perf]# strace -e openat -e file perf test -F -v "mmap interface" |&
grep syscalls
openat(AT_FDCWD,
"/sys/kernel/debug/tracing/events/syscalls/sys_enter_getsid/format", O_RDONLY)
= 3
openat(AT_FDCWD,
"/sys/kernel/debug/tracing/events/syscalls/sys_enter_getppid/format", O_RDONLY)
= -1 ENOENT (No such file or directory)
[root@jouet perf]#
Where did syscalls:sys_enter_getppid go? Zero argument syscall,
investigating...
- Arnaldo
