[llvm-dev] Critical XRay fixes for Arm32

Hans Wennborg via llvm-dev llvm-dev at lists.llvm.org
Thu Jan 26 10:44:04 PST 2017

How is XRay tested? IIRC, Renato didn't see any test failures on ARM?

Merging sounds reasonbaly, I'd just like to understand what's the risk
for the branch.

On Thu, Jan 26, 2017 at 10:29 AM, Serge Rogatch <serge.rogatch at gmail.com> wrote:
> Hans, these changes reached trunk in https://reviews.llvm.org/rL292516 and
> https://reviews.llvm.org/rL292517 . Could you look?
> On 26 January 2017 at 03:29, Serge Rogatch <serge.rogatch at gmail.com> wrote:
>> Sorry, I initially included LLVM-Commits rather than LLVM-Dev. Fixed.
>> On 26 January 2017 at 03:26, Serge Rogatch <serge.rogatch at gmail.com>
>> wrote:
>>> Hi Dean, Renato,
>>> AFAIK, unfortunately, these critical Arm32 XRay fixes are not yet in 4.0:
>>> https://reviews.llvm.org/D28624 , https://reviews.llvm.org/D28623 . The
>>> first repairs XRay instrumentation map emission. Without this map XRay
>>> doesn't work at all: the runtime doesn't see anything to instrument. The
>>> second fixes the CPU cache incoherency problem. Without this patch, XRay
>>> will intermittently fail to patch or unpatch some sleds (depending on
>>> whether their code is in CPU cache or not).
>>> Is there any chance we can get these patches to 4.0? This page
>>> http://llvm.org/docs/HowToReleaseLLVM.html#release-patch-rules says that
>>> "release manager, the official release testers or the code owners" may
>>> approve cherry-picking to release branch from trunk. AFAIK, you are code
>>> owners for XRay and ARM. I don't know who are the release manager or
>>> official release testers.
>>> Cheers,
>>> Serge

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