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runtime: don't do unnecessary loads on malloc fast path #8887

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dvyukov opened this issue Oct 7, 2014 · 1 comment

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Performance

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dvyukov commented Oct 7, 2014

Currently we load runtime.memstats.heap_alloc and runtime.MemProfileRate on every
malloc. Both are not strictly necessary and bring 2 unnecessary cache lines into cache.

Here are proof-of-concept CLs:
https://golang.org/cl/129810043/
https://golang.org/cl/128100043/

Ideally we trigger GC directly from mcacheRefill, but it's not trivial to implement.

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rsc commented Oct 7, 2014

Comment 1:

Is this causing a performance problem?

dvyukov added accepted Performance labels

rsc added this to the Unplanned milestone

rsc removed release-none labels

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