[PATCH] ld: pe: Improve performance of object file exclude symbol directives

Nick Clifton nickc@redhat.com
Tue Sep 6 11:42:18 GMT 2022


Hi Jan,

> On 05.09.2022 14:54, Nick Clifton via Binutils wrote:
>>> +      max_exclude_symbols = ROUND_UP(fdef->num_exclude_symbols + 1, 32);
>>
>> Given that the point of this patch is to improve performance when there
>> are a large number of excluded symbols, incrementing the array by 32 slots
>> at a time seems counter intuitive.  I would suggest a bigger number, eg 1024
>> or 10240.
> 
> Perhaps double the value, thus not overly much impacting the case of there
> being a moderate number of excludes?

To be honest I have no idea what a "large number of excludes" might look like.
So maybe 32 is actually a sensible increment.  Doubling the increment every
time the limit is reached could lead to resource exhaustion issues in extreme
cases, but I doubt if that will ever happen in real life, so that works for me
too.

Cheers
   Nick




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