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Re: PATCH: Turn on -fomit-frame-pointer by default for 32bit Linux/x86


On 08/04/2010 06:41 PM, H.J. Lu wrote:
> On Wed, Aug 4, 2010 at 10:35 AM, Andi Kleen <andi@firstfloor.org> wrote:
>> "H.J. Lu" <hjl.tools@gmail.com> writes:
>>>
>>> Can we find if oprofile works with -fomit-frame-pointer on 32bit Linux/x86.
>>
>> It doesn't for user space. The problem is that you would need
>> an in kernel dwarf2 unwinder that reads user space tables.
>>
>> x86-64 suffers from this already.
> 

> But it is considered acceptable

By whom?

> so that we still want -fomit-frame-pointer for Linux/x86-64.

Ah, so your argument *is* "x86-64 profiling is degraded, so we might
as well degrade x86 as well."

Andrew.


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