lkml.org 
[lkml]   [2018]   [Apr]   [17]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH v2] tracing/x86: Update syscall trace events to handle new x86 syscall func names
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 <acme@redhat.com>
> > Fixes: d5a00528b58c ("syscalls/core, syscalls/x86: Rename struct pt_regs-based sys_*() to __x64_sys_*()")
> > Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>

> Tested-by: Arnaldo Carvalho de Melo <acme@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

\
 
 \ /
  Last update: 2018-04-17 19:57    [W:0.075 / U:0.084 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site