[PATCH] D96811: [CSSPGO][llvm-profgen] Change sample count of dangling probe in llvm-profgen

[Hongtao Yu via Phabricator via llvm-commits]

hoy added inline comments.


================
Comment at: llvm/tools/llvm-profgen/ProfileGenerator.cpp:505
+
     FunctionProfile.addTotalSamples(Count);
     if (Probe->isEntry()) {
----------------
wlei wrote:
> hoy wrote:
> > wenlei wrote:
> > > Do we still want to count samples on dangling probe towards total samples? Without deduplication for dangling probes, we could have multiple dangling probes in the same block and counting samples covering these probe repeatedly may cause bloated total samples?  
> > Good point. Since the samples collected on dangling probes are invalid, I would not count it against total samples.
> I see, thanks for your suggestion.
> 
> How about the count for `isEntry` for line506, I guess it's the original count not the zero? Or we won't have dangling probe which is the entry probe?
That's a good point. It's possible to have a dangling entry probe and we should bail out here. Or we can just return right after adding body samples for dangling probes.


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D96811/new/

https://reviews.llvm.org/D96811