Automatic PGO - Initial implementation (1/N)

Eric Christopher echristo at
Tue Sep 24 13:39:32 PDT 2013

On Tue, Sep 24, 2013 at 1:38 PM, Renato Golin <renato.golin at> wrote:
> On 24 September 2013 19:38, Eric Christopher <echristo at> wrote:
>> -gline-tables-only (or -gmlt in gcc parlance). This will give you
>> accurate call stack information for each sample. Or at least as
>> accurate as I can get it.
> FWIW, I'm using perf with "-O3 -g" and LLVM has retained the line
> information quite well throughout all the inlining and optimizations that
> happened.

Excellent. That's what I would expect.

> I assume it's easier to keep line information than variable location ranges
> and types. The biggest problem is to separate the two emissions, I guess,
> not the quality of the resulting information.

Yep. That's precisely it.


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