From: Nathan_Lynch@mentor.com (Nathan Lynch)
To: linux-arm-kernel@lists.infradead.org
Subject: Perf top always show 0.00
Date: Fri, 18 Apr 2014 12:48:23 -0500 [thread overview]
Message-ID: <53516567.10405@mentor.com> (raw)
In-Reply-To: <CAHrpEqQZ_0G-rmwfaeEzHOFVckyRRSUpYrPdMUgPjRZ1JYyy6g@mail.gmail.com>
On 04/18/2014 12:00 PM, Frank Li wrote:
> I use mx6dq platform. Found below problem.
>
> Run Perf top. First column always 0, but order look like correct.
>
> 0.00% perf [.] 0x00049420
> 0.00% [kernel] [k] kallsyms_expand_symbol.constprop.5
> 0.00% [kernel] [k] vsnprintf
> 0.00% [kernel] [k] arch_cpu_idle
> 0.00% [kernel] [k] format_decode
> 0.00% [kernel] [k] number.isra.2
> 0.00% libc-2.19.so [.] strstr
> 0.00% libc-2.19.so [.] 0x00072498
> 0.00% libc-2.19.so [.] memchr
> 0.00% [kernel] [k] _raw_spin_unlock_irqrestore
> 0.00% [kernel] [k] string.isra.4
> 0.00% [kernel] [k] strnlen
> 0.00% libc-2.19.so [.] getdelim
> 0.00% libc-2.19.so [.] memcpy
> 0.00% [kernel] [k] lock_acquire
> 0.00% libc-2.19.so [.] strchr
> 0.00% libc-2.19.so [.] strcmp
> 0.00% [kernel] [k] _raw_spin_unlock_irq
> 0.00% libc-2.19.so [.] __libc_calloc
> 0.00% libc-2.19.so [.] _IO_feof
> 0.00% [kernel] [k] pointer.isra.15
The PMU is possibly worthless:
http://lists.infradead.org/pipermail/linux-arm-kernel/2012-August/113802.html
http://lists.infradead.org/pipermail/linux-arm-kernel/2013-February/151945.html
next prev parent reply other threads:[~2014-04-18 17:48 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-04-18 17:00 Perf top always show 0.00 Frank Li
2014-04-18 17:48 ` Nathan Lynch [this message]
2014-04-23 9:15 ` Jason Liu
2014-04-23 14:26 ` Frank Li
2014-04-24 4:58 ` Jason Liu
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