On Wed, Feb 14, 2018 at 12:57 AM, Junio C Hamano <gits...@pobox.com> wrote:
> Duy Nguyen <pclo...@gmail.com> writes:
>> It's very tempting considering that the amount of changes is much
>> smaller. But I think we should go with my version. The hope is when a
>> _new_ call site appears, the author would think twice before passing
>> zero or one to the safe_path argument.
> Wouldn't it be a better API if the author of new callsite does not
> have to think twice and can instead rely on the called function
> untracked_cache_invalidate_path() to always do the right thing?

I am worried that always doing the right thing may carry performance
penalty (this is based purely on reading verify_path() code, no actual
benchmarking). For safety, you can always set safe_path to zero. But
if you do a lot of invalidation and something starts to slow down,
then you can consider setting safe_path to 1 (if it's actually safe to
do so). I think we do mass invalidation in some case, so I will try to
actually benchmark that and see if this safe_path argument is
justified or if we can always call verify_path().

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