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From: Russell King - ARM Linux <linux@arm.linux.org.uk>
To: Felipe Balbi <balbi@ti.com>
Cc: Arnaldo Carvalho de Melo <acme@kernel.org>,
	Peter Zijlstra <a.p.zijlstra@chello.nl>,
	Tony Lindgren <tony@atomide.com>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	Ingo Molnar <mingo@redhat.com>, Paul Mackerras <paulus@samba.org>,
	Linux OMAP Mailing List <linux-omap@vger.kernel.org>,
	Linux ARM Kernel Mailing List 
	<linux-arm-kernel@lists.infradead.org>
Subject: Re: perf not capturing stack traces
Date: Sun, 25 Jan 2015 15:56:52 +0000	[thread overview]
Message-ID: <20150125155651.GB11502@n2100.arm.linux.org.uk> (raw)
In-Reply-To: <20150124222342.GA26941@saruman.tx.rr.com>

On Sat, Jan 24, 2015 at 04:23:42PM -0600, Felipe Balbi wrote:
> yeah, I'll try a few older kernels, also see if I can reproduce on other
> boards.

Perf works for me with CONFIG_FRAME_POINTER=y, but that's only for kernel
space, and for userspace where the programs have been built for ARM mode
with frame pointers.

The kernel may work without CONFIG_FRAME_POINTER set, but I've never
tested that, and I'd suggest that (given my experience looking at oops
dumps) it's not all that reliable.

Lastly, userspace without frame pointers is pretty much hopeless.

-- 
FTTC broadband for 0.8mile line: currently at 10.5Mbps down 400kbps up
according to speedtest.net.

WARNING: multiple messages have this Message-ID (diff)
From: linux@arm.linux.org.uk (Russell King - ARM Linux)
To: linux-arm-kernel@lists.infradead.org
Subject: perf not capturing stack traces
Date: Sun, 25 Jan 2015 15:56:52 +0000	[thread overview]
Message-ID: <20150125155651.GB11502@n2100.arm.linux.org.uk> (raw)
In-Reply-To: <20150124222342.GA26941@saruman.tx.rr.com>

On Sat, Jan 24, 2015 at 04:23:42PM -0600, Felipe Balbi wrote:
> yeah, I'll try a few older kernels, also see if I can reproduce on other
> boards.

Perf works for me with CONFIG_FRAME_POINTER=y, but that's only for kernel
space, and for userspace where the programs have been built for ARM mode
with frame pointers.

The kernel may work without CONFIG_FRAME_POINTER set, but I've never
tested that, and I'd suggest that (given my experience looking at oops
dumps) it's not all that reliable.

Lastly, userspace without frame pointers is pretty much hopeless.

-- 
FTTC broadband for 0.8mile line: currently at 10.5Mbps down 400kbps up
according to speedtest.net.

  reply	other threads:[~2015-01-25 15:57 UTC|newest]

Thread overview: 45+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-01-23 19:51 perf not capturing stack traces Felipe Balbi
2015-01-23 19:51 ` Felipe Balbi
2015-01-23 19:51 ` Felipe Balbi
2015-01-23 19:53 ` Felipe Balbi
2015-01-23 19:53   ` Felipe Balbi
2015-01-23 19:53   ` Felipe Balbi
2015-01-23 20:59 ` Arnaldo Carvalho de Melo
2015-01-23 20:59   ` Arnaldo Carvalho de Melo
2015-01-23 20:59   ` Arnaldo Carvalho de Melo
2015-01-23 22:37   ` Felipe Balbi
2015-01-23 22:37     ` Felipe Balbi
2015-01-23 22:37     ` Felipe Balbi
2015-01-24 15:12     ` Arnaldo Carvalho de Melo
2015-01-24 15:12       ` Arnaldo Carvalho de Melo
2015-01-24 15:12       ` Arnaldo Carvalho de Melo
2015-01-24 22:23       ` Felipe Balbi
2015-01-24 22:23         ` Felipe Balbi
2015-01-24 22:23         ` Felipe Balbi
2015-01-25 15:56         ` Russell King - ARM Linux [this message]
2015-01-25 15:56           ` Russell King - ARM Linux
2015-01-25 15:56           ` Russell King - ARM Linux
2015-01-26 10:27           ` Will Deacon
2015-01-26 10:27             ` Will Deacon
2015-01-26 10:27             ` Will Deacon
2015-01-26 12:12             ` Arnaldo Carvalho de Melo
2015-01-26 12:12               ` Arnaldo Carvalho de Melo
2015-01-26 12:12               ` Arnaldo Carvalho de Melo
2015-01-26 12:16               ` Will Deacon
2015-01-26 12:16                 ` Will Deacon
2015-01-26 12:16                 ` Will Deacon
2015-01-26 12:29                 ` Arnaldo Carvalho de Melo
2015-01-26 12:29                   ` Arnaldo Carvalho de Melo
2015-01-26 12:29                   ` Arnaldo Carvalho de Melo
2015-01-26 13:54               ` Russell King - ARM Linux
2015-01-26 13:54                 ` Russell King - ARM Linux
2015-01-26 13:54                 ` Russell King - ARM Linux
2015-01-26 14:33                 ` Arnaldo Carvalho de Melo
2015-01-26 14:33                   ` Arnaldo Carvalho de Melo
2015-01-26 14:33                   ` Arnaldo Carvalho de Melo
2015-01-26 13:51             ` Russell King - ARM Linux
2015-01-26 13:51               ` Russell King - ARM Linux
2015-01-26 13:51               ` Russell King - ARM Linux
2015-01-26 14:37               ` Arnaldo Carvalho de Melo
2015-01-26 14:37                 ` Arnaldo Carvalho de Melo
2015-01-26 14:37                 ` Arnaldo Carvalho de Melo

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