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runtime: on linux/PPC64, usleep computes incorrect tv_nsec parameter [1.19 backport] #56397

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gopherbot opened this issue Oct 24, 2022 · 2 comments
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runtime: on linux/PPC64, usleep computes incorrect tv_nsec parameter [1.19 backport] #56397

gopherbot opened this issue Oct 24, 2022 · 2 comments
Labels
CherryPickApproved Used during the release process for point releases compiler/runtime Issues related to the Go compiler and/or runtime.
Milestone
Go1.19.4

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@gopherbot
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@pmur requested issue #56374 to be considered for backport to the next 1.19 minor release.

@gopherbot please consider a backport to 1.18 and 1.19. This is a subtle bug.
@gopherbot gopherbot added the CherryPickCandidate Used during the release process for point releases label Oct 24, 2022
@gopherbot gopherbot mentioned this issue Oct 24, 2022
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@gopherbot gopherbot added the compiler/runtime Issues related to the Go compiler and/or runtime. label Oct 24, 2022
@gopherbot gopherbot added this to the Go1.19.3 milestone Oct 24, 2022
@gopherbot
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Change https://go.dev/cl/445157 mentions this issue: [release-branch.go1.19] runtime: fix usleep on linux/PPC64

@heschi heschi added the CherryPickApproved Used during the release process for point releases label Oct 26, 2022
@gopherbot gopherbot removed the CherryPickCandidate Used during the release process for point releases label Oct 26, 2022
@gopherbot gopherbot modified the milestones: Go1.19.3, Go1.19.4 Nov 1, 2022
@gopherbot
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Closed by merging 23fd10b to release-branch.go1.19.

gopherbot pushed a commit that referenced this issue Nov 8, 2022
@pmur @mknyszek
[release-branch.go1.19] runtime: fix usleep on linux/PPC64
23fd10b 
The existing implementation fails to convert the remainder
microseconds to nanoseconds. This causes sysmon to consume
much more cpu, and generate lots of context switches.

We can also do a little better here to avoid division by a
constant. I used go to determine the magic numbers.

Fixes #56397

Change-Id: I2e37ec218b9027efab6db4634eed1504c0c1b3c8
Reviewed-on: https://go-review.googlesource.com/c/go/+/444735
Reviewed-by: Lynn Boger <laboger@linux.vnet.ibm.com>
Run-TryBot: Paul Murphy <murp@ibm.com>
Reviewed-by: David Chase <drchase@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Bryan Mills <bcmills@google.com>
Reviewed-on: https://go-review.googlesource.com/c/go/+/445157
andrew-d pushed a commit to tailscale/go that referenced this issue Dec 7, 2022
@pmur @andrew-d
[release-branch.go1.19] runtime: fix usleep on linux/PPC64
a78f040 
The existing implementation fails to convert the remainder
microseconds to nanoseconds. This causes sysmon to consume
much more cpu, and generate lots of context switches.

We can also do a little better here to avoid division by a
constant. I used go to determine the magic numbers.

Fixes golang#56397

Change-Id: I2e37ec218b9027efab6db4634eed1504c0c1b3c8
Reviewed-on: https://go-review.googlesource.com/c/go/+/444735
Reviewed-by: Lynn Boger <laboger@linux.vnet.ibm.com>
Run-TryBot: Paul Murphy <murp@ibm.com>
Reviewed-by: David Chase <drchase@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Bryan Mills <bcmills@google.com>
Reviewed-on: https://go-review.googlesource.com/c/go/+/445157
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Labels
CherryPickApproved Used during the release process for point releases compiler/runtime Issues related to the Go compiler and/or runtime.
Projects
Go Compiler / Runtime
Status: Done
Milestone
Go1.19.4
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@gopherbot @heschi