[jsc-dev] bmalloc freelist from JIT code

[Geoffrey Garen]

> On Fri, Nov 3, 2017 at 4:49 AM, Filip Pizlo <fpizlo at apple.com <mailto:fpizlo at apple.com>> wrote:
> I think he means: expose whatever the bmalloc fast path is to the JIT.  I didn’t take it to mean literally add a free list.
> 
> Yeah, right. My question is: is that feasible to add an interface to allocate bmalloc memory from JIT code?
> Is there any known concern about this direction?

I see.

I tend to agree with Phil that inlining bmalloc allocation is possible but it is better to avoid doing so unless we meet a high burden of proof.

FWIW, in MallocBench benchmarks I haven’t seen a significant speedup from inlining the allocation path — even though doing so allows you to constant-fold the allocator selection math.

I guess you could start by just inlining the Slice and Substring operations, and then seen how much additional speedup you got by inlining the allocation too.

Geoff
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