[llvm-dev] RFC: Sanitizer-based Heap Profiler

[Xinliang David Li via llvm-dev]

On Tue, Jul 6, 2021 at 5:09 AM Andrey Bokhanko <andreybokhanko at gmail.com>
wrote:

> Hi Teresa,
>
> Thank you for the quick reply! I'm really happy to see the project is
> moving forward!
>
> > 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.
>
> Just to double check: do you plan to open-source this runtime? --
>

It will be in tcmalloc initially.


> perhaps as a part of LLVM?
>

A wrapper runtime layer in LLVM is possible, but not initially.

David

>
> Yours,
> Andrey
>
> On Tue, Jul 6, 2021 at 12:54 AM Teresa Johnson <tejohnson at google.com>
> wrote:
> >
> > 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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