How should you ask for a gank top lane?

I was wondering what the best way around asking for a gank is when you play top lane. I mostly do pretty ok in my lane and I have an ok understanding of freezing a lane (thanks to solorenektononly). So in the case of me freezing a lane and having a low enemy top laner facing me, i ping my jungler to come for a pretty free gank in my opinion, but for whatever reason, most junglers seem to ignore this even though it could snowball the lane. Should I keep pinging or do any fellow top laners/junglers have some additional advice in order to ask for a gank. Thanks!
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