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go / go / 65aa2da61793846b9929c239dcbdb266490335e5
commit65aa2da61793846b9929c239dcbdb266490335e5[log] [tgz]
authorAustin Clements <austin@google.com>Sun Oct 04 20:56:11 2015 -0700
committerAustin Clements <austin@google.com>Fri Oct 09 19:39:03 2015 +0000
treea0d532c7f8256a304ab3c3189d808e5a0881a2b8
parent89c341c5e969b571a9475b263b237a8a25efd76b [diff]
runtime: assist before allocating

Currently, when the mutator allocates, the runtime first allocates the
memory and then, if that G has done "enough" allocation, the runtime
checks whether the G has assist debt to pay off and, if so, pays it
off. This approach leads to under-assisting, where a G can allocate a
large region (or many small regions) before paying for it, or can even
exit with outstanding debt.

This commit flips this around so that a G always acquires enough
credit for an allocation before it can perform that allocation. We
continue to amortize the cost of assists by requiring that they
over-assist when triggered to build up credit for many allocations.

Fixes #11967.

Change-Id: Idac9f11133b328535667674d837be72c23ebd899
Reviewed-on: https://go-review.googlesource.com/15409
Reviewed-by: Rick Hudson <rlh@golang.org>
Run-TryBot: Austin Clements <austin@google.com>
3 files changed
tree: a0d532c7f8256a304ab3c3189d808e5a0881a2b8
  1. api/
  2. doc/
  3. lib/
  4. misc/
  5. src/
  6. test/
  7. .gitattributes
  8. .gitignore
  9. AUTHORS
  10. CONTRIBUTING.md
  11. CONTRIBUTORS
  12. favicon.ico
  13. LICENSE
  14. PATENTS
  15. README.md
  16. robots.txt
README.md

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