Re: Noted slowness in profile loading with binutils 2.37

[Alexander Lindsay <alexlindsay239@gmail.com>]

So it looks like you were spot-on

On Fri, Feb 11, 2022 at 10:16 AM Alexander Lindsay <alexlindsay239@gmail.com>
wrote:

> Hi Nick,
>
> This was the result of my bisect:
>
> ca8f6bc629cb27792ce449e7253c74a3f6f75fda is the first bad commit
> Date:   Tue Mar 2 16:08:23 2021 +0000
>
>     Fix the BFD library's parsing of DIEs where specification attributes
> can refer to variables that are defined later on.
>
>             PR 27484
>             * dwarf2.c (scan_unit_for_symbols): Scan twice, once to
> accumulate
>             function and variable tags and a second time to resolve their
>             attributes.
>
>  bfd/ChangeLog |   7 ++++
>  bfd/dwarf2.c  | 133
> ++++++++++++++++++++++++++++++++++++++++++++++------------
>  2 files changed, 114 insertions(+), 26 deletions(-)
>
> On Thu, Feb 10, 2022 at 3:00 AM Nick Clifton <nickc@redhat.com> wrote:
>
>> Hi Alexander,
>>
>> > - binutils version 2.36.1: 6.5 seconds
>> > - binutils version 2.37: Still not loaded at 6 minutes
>> >
>> > I think the relevant binutil tool here is addr2line. Does anyone have a
>> > quick idea for what may have caused the slow-down?
>>
>> It will be a change in the BFD library.  More specifically it
>> is likely to be a change to bfd/dwarf2.c.  Have a look at the
>> ChangeLog in the bfd/ directory for the 2.37 release for more
>> hints.
>>
>> I suspect, but do not know for sure, that it could be the patch
>> for PR 27484 ....
>>
>> Cheers
>>    Nick
>>
>>
>>