Re: oprofile callgraph support missing for common cpus
From: Juntang Fu(David) <hidden>
Date: 2011-11-25 05:58:32
On 11/25/2011 01:24 PM, Benjamin Herrenschmidt wrote:
On Fri, 2011-11-18 at 09:22 +0100, Joakim Tjernlund wrote:quoted
I forgot to ask, oprofile mentions setting -no-omit-framepointer to get correct backtrace but I cannot turn on frame pointers for the ppc kernel. Isn't frame pointers needed for pcc? what about user space?PowerPC always has frame pointers, ignore that :-)
Recently I have met a similar problem on frame pointer but at arm_v7 variant in back tracing support for Oprofile, could you help me see it? thanks in advance: in my case, I have enabled Oprofile support in my arm_v7 thumb2 target, in the created binary image including kernel image and rootfs, seems that frame pointer is not enabled for arm thumb2, So I have met the following problems in back trace: I can get the right stack traces for kernel stack, but for user stack, the stack length is always one depth, why? Is this a known deficiency in supporting arm thumb2 for Oprofile stack trace? Thanks. B.R. --David
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