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Audit mt.rs #165

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merged 4 commits into from
Dec 4, 2020
Merged

Audit mt.rs #165

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97921db
Don't leak memory if we race with another thread when starting tracing.
ltratt Dec 4, 2020
f455452
'mem::forget' is a more idiomatic way of not dropping something.
ltratt Dec 4, 2020
56d0156
Ensure the hot count is incremented even if we're racing with another…
ltratt Dec 4, 2020
ec92144
Pointer tagging should be OR not left-shift.
ltratt Dec 4, 2020
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4 changes: 4 additions & 0 deletions ykrt/src/mt.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -244,6 +244,10 @@ impl MTThread {
Rc::get_mut(&mut self.inner).unwrap().tracer =
Some((start_tracing(self.inner.tracing_kind), loc_id));
return None;
} else {
// We raced with another thread that's also trying to trace this
// Location, so free the malloc'd block.
unsafe { Box::from_raw(loc_id) };
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I wonder if we should just eagerly allocate each thread an ID upon it's creation. Then the ID can be reused across many tracing sessions at zero additional cost.

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Good idea. Once the current bug is fixed I'll look into that.

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And by extension, is the address of the MTInner a better ID?

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@ltratt ltratt Dec 4, 2020 •
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That feature might be disappearing at some point. Not sure yet.

}
} else {
let new_pack = PHASE_COUNTING | ((count + 1) << PHASE_NUM_BITS);
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