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

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Message-ID: <20180417125723.6506e1d1@gandalf.local.home>
Date:   Tue, 17 Apr 2018 12:57:23 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Arnaldo Carvalho de Melo <acme@...nel.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] tracing/x86: Update syscall trace events to handle new
 x86 syscall func names

On Tue, 17 Apr 2018 12:40:19 -0400
Steven Rostedt <rostedt@...dmis.org> wrote:

> On Tue, 17 Apr 2018 13:35:27 -0300
> Arnaldo Carvalho de Melo <acme@...nel.org> wrote:
> 
> 
> > [root@...et ~]# perf test openat
> >  2: Detect openat syscall event                           : Ok
> >  3: Detect openat syscall event on all cpus               : Ok
> > 15: syscalls:sys_enter_openat event fields                : Ok
> > [root@...et ~]#
> > 
> > [root@...et ~]# perf trace -e nanosleep,syscalls:*nanosleep sleep 1
> >      0.000 (         ): syscalls:sys_enter_nanosleep:rqtp: 0x7ffd9f737950, rmtp: 0x00000000
> >      0.009 (         ): sleep/7905 nanosleep(rqtp: 0x7ffd9f737950                                        ) ...
> >   1000.204 (         ): syscalls:sys_exit_nanosleep:0x0
> >      0.009 (1000.217 ms): sleep/7905  ... [continued]: nanosleep()) = 0
> > [root@...et ~]#
> > 
> > Works, so the regression seems to be fixed, without looking at the code
> > that much:
> > 
> > Tested-by: Arnaldo Carvalho de Melo <acme@...hat.com>  
> 
> But does this still work on x86_32? I'll test that out. Thanks for
> testing, but I may have another patch soon.

OK, it's still broken there with this patch. I got this:

# ls /sys/kernel/tracing/events/syscalls
enable
filter
sys_enter_nanosleep
sys_exit_nanosleep

But with this:

	return !strcmp(sym + 9, name + 3) || !strcmp(sym + 3, name + 3);

I get all the syscalls back. I'll make another patch.

-- Steve