linux-kernel - Re: BUG: perf error on syscalls for powerpc64.

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Message-ID: <20150717015104.GA25558@us.ibm.com>
Date:	Thu, 16 Jul 2015 18:51:04 -0700
From:	Sukadev Bhattiprolu <sukadev@...ux.vnet.ibm.com>
To:	Zumeng Chen <zumeng.chen@...il.com>
Cc:	Michael Ellerman <mpe@...erman.id.au>,
	linux-kernel@...r.kernel.org, paulus@...ba.org,
	imunsie@....ibm.com, linuxppc-dev@...ts.ozlabs.org,
	romeo.cane.ext@...iant.com
Subject: Re: BUG: perf error on syscalls for powerpc64.

Zumeng Chen [zumeng.chen@...il.com] wrote:
| 3. What I have seen in 3.14.x kernel,
| ======================
| And so far, no more difference to 4.x kernel from me about this part if
| I'm right.
| 
| *) With 1028ccf5
| 
| perf list|grep -i syscall got me nothing.
| 
| 
| *) Without 1028ccf5
| root@...alhost:~# perf list|grep -i syscall
|    syscalls:sys_enter_socket                          [Tracepoint event]
|    syscalls:sys_exit_socket                           [Tracepoint event]
|    syscalls:sys_enter_socketpair                      [Tracepoint event]
|    syscalls:sys_exit_socketpair                       [Tracepoint event]
|    syscalls:sys_enter_bind                            [Tracepoint event]
|    syscalls:sys_exit_bind                             [Tracepoint event]
|    syscalls:sys_enter_listen                          [Tracepoint event]
|    syscalls:sys_exit_listen                           [Tracepoint event]
|    ... ...

Are you seeing this on big-endian or little-endian system?

IIRC, I saw the opposite behavior on an LE system a few months ago.
i.e. without 1028ccf5, 'perf listf|grep syscall' failed.

Applying 1028ccf5, seemed to fix it.

Sukadev

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