llvm dev - Jul 2021 - RFC: Sanitizer-based Heap Profiler

Hi Teresa,

A year has passed since you posted this RFC; could you, please, give a
quick update on the current state of heap profiler development?

(Sorry if you already did so; I looked through llvm-dev mailing list
to no avail -- but perhaps I missed something?)

We (Huawei) are very interested in data cache optimizations; we are
discussing our plans with Maxim and others on the BOLT project github
(https://github.com/facebookincubator/BOLT/issues/178); I would be
really interested to hear your perspective / plans -- either on BOLT
project discussion or here.

One area of particular interest are specific data cache optimizations
you plan (or not?) to implement either in compiler / binary optimizer
/ runtime optimizer based on heap profiler data.

Thank you!

Yours,
Andrey
==Advanced Software Technology Lab
Huawei

Hi Andrey,

The compiler side support for the necessary instrumentation went in a while
back (D85948), as did the compiler-rt support (D87120 is the main one, but
there were a number of preparatory and follow-on patches). Currently it
dumps to a text file. We've been working on designs for the binary profile
format, IR handling for the profile data, and context disambiguation
support. We plan to send RFCs for some of this early this quarter.

We initially plan to use the profile information to provide guidance to the
dynamic allocation runtime on data allocation and placement. We'll send
more details on that when it is fleshed out too.

Teresa

On Mon, Jul 5, 2021 at 7:02 AM Andrey Bokhanko <andreybokhanko at
gmail.com>
wrote:
> Hi Teresa,
>
> A year has passed since you posted this RFC; could you, please, give a
> quick update on the current state of heap profiler development?
>
> (Sorry if you already did so; I looked through llvm-dev mailing list
> to no avail -- but perhaps I missed something?)
>
> We (Huawei) are very interested in data cache optimizations; we are
> discussing our plans with Maxim and others on the BOLT project github
> (https://github.com/facebookincubator/BOLT/issues/178); I would be
> really interested to hear your perspective / plans -- either on BOLT
> project discussion or here.
>
> One area of particular interest are specific data cache optimizations
> you plan (or not?) to implement either in compiler / binary optimizer
> / runtime optimizer based on heap profiler data.
>
> Thank you!
>
> Yours,
> Andrey
> ==> Advanced Software Technology Lab
> Huawei
>

-- 
Teresa Johnson |  Software Engineer |  tejohnson at google.com |
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