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runtime: treap implementation of find() doesn't return the best-fit span [1.12 backport] #31677

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gopherbot opened this issue Apr 25, 2019 · 2 comments
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runtime: treap implementation of find() doesn't return the best-fit span [1.12 backport] #31677

gopherbot opened this issue Apr 25, 2019 · 2 comments
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@mknyszek
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Go1.12.5

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@gopherbot gopherbot commented Apr 25, 2019

@mknyszek requested issue #31616 to be considered for backport to the next 1.12 minor release.

@gopherbot please open a backport to 1.12. The VSS growth problem has been bad enough that it's prevented some users from being able to move to 1.12, since some of the heap metadata grows proportionally with the amount of mapped memory.
@gopherbot gopherbot mentioned this issue Apr 25, 2019
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@gopherbot gopherbot added this to the Go1.12.5 milestone Apr 25, 2019
@mknyszek mknyszek self-assigned this Apr 25, 2019
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@gopherbot gopherbot commented Apr 25, 2019

Change https://golang.org/cl/173939 mentions this issue: runtime: make mTreap.find actually find the best fit
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@gopherbot gopherbot commented Apr 26, 2019

Closed by merging 438b1a5 to release-branch.go1.12.
@gopherbot gopherbot closed this Apr 26, 2019
gopherbot pushed a commit that referenced this issue Apr 26, 2019
@mknyszek @bradfitz
[release-branch.go1.12] runtime: make mTreap.find actually find the b…
438b1a5 
…est fit

This change modifies the implementation of mTreap.find to find the
best-fit span with the lowest possible base address.

Fixes #31677.

Change-Id: Ib4bda0f85d7d0590326f939a243a6e4665f37d3f
Reviewed-on: https://go-review.googlesource.com/c/go/+/173479
Run-TryBot: Michael Knyszek <mknyszek@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Austin Clements <austin@google.com>
(cherry picked from commit 8c05d67)
Reviewed-on: https://go-review.googlesource.com/c/go/+/173939
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
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