[google] support for building Linux kernel with FDO (issue4523061)

[Xinliang David Li]

On Mon, May 16, 2011 at 3:38 PM, Andi Kleen <andi@firstfloor.org> wrote:
> Jan Hubicka <hubicka@ucw.cz> writes:
>> Yep,
>> I think it does make sense to share the implementation, but we need to find
>> resonable way to do so.
>
> I doubt this will be very popular with the kernel community, which
> prefers self contained code.

Won't be surprised if there are objections ..

>
> Also the interface doesn't change that often or does it?

As FDO gains popularity,  the profile coverage code will change faster
than people may think.  To quote some potential ones -- lightweight
ipo, path profiling, call trace profiling etc.

>
> The current kernel code is for gcc 3. That could be simply
> replaced with a modern gcc 4 interface.

Rong's approach will let kernel get coverage + FDO support almost for
free -- there is no need for kernel to maintain something is basically
not maintainable.

Thanks,

David

>
> -Andi
>
> --
> ak@linux.intel.com -- Speaking for myself only
>