linux-kernel - Re: [PATCH v2] tracing/x86: Update syscall trace events to handle new x86 syscall func names

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Date:   Tue, 17 Apr 2018 14:56:47 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Steven Rostedt <rostedt@...dmis.org>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        "H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
        Dominik Brodowski <linux@...inikbrodowski.net>
Subject: Re: [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@...hat.com>
> > Fixes: d5a00528b58c ("syscalls/core, syscalls/x86: Rename struct pt_regs-based sys_*() to __x64_sys_*()")
> > Signed-off-by: Steven Rostedt (VMware) <rostedt@...dmis.org>
 
> Tested-by: Arnaldo Carvalho de Melo <acme@...hat.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@...et 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@...et perf]#

[root@...et 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@...et perf]#

Where did syscalls:sys_enter_getppid go? Zero argument syscall,
investigating...

- Arnaldo