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Make XRay support timestamp emulation in x86_64 #31496

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llvmbot opened this issue Mar 6, 2017 · 2 comments
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Make XRay support timestamp emulation in x86_64 #31496

llvmbot opened this issue Mar 6, 2017 · 2 comments
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bugzilla Issues migrated from bugzilla xray

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@llvmbot
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llvmbot commented Mar 6, 2017

Bugzilla Link 32148
Resolution FIXED
Resolved on Apr 08, 2017 11:48
Version unspecified
OS Linux
Blocks #31929
Reporter LLVM Bugzilla Contributor
CC @rnk

Extended Description

Currently, XRay hard-fails to initialise on x86_64 machines that don't have support for rdtscp enabled to user-space programs. Some POSIX operating systems disable these for various reasons.

We currently have an alternative implementation being used in non-x86_64 systems where we don't have a user-space available cycle counter implementation that emulates the tsc data. XRay should instead try to use this implementation (or something very similar) instead of hard-failing to initialise.

This currently shows up in some build bots as test failures for XRay runtime tests where it fails to detect rdstcp support.
@llvmbot
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llvmbot commented Mar 15, 2017

Fixed in https://reviews.llvm.org/rL297800

@sylvestre
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mentioned in issue #31929

@sylvestre sylvestre mentioned this issue Apr 8, 2017
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@llvmbot llvmbot transferred this issue from llvm/llvm-bugzilla-archive Dec 10, 2021
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