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

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Message-ID: <55A8939C.3090606@windriver.com>
Date:	Fri, 17 Jul 2015 13:33:16 +0800
From:	Zumeng Chen <zumeng.chen@...driver.com>
To:	Sukadev Bhattiprolu <sukadev@...ux.vnet.ibm.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.

On 2015年07月17日 09:51, Sukadev Bhattiprolu wrote:
> 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?

Big one.

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

I wonder if this has anything to do with the bug.

Cheers,
Zumeng

>
> Applying 1028ccf5, seemed to fix it.
>
> Sukadev
>

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