[Mono-dev] GC precision

[Miguel de Icaza]

Mono 2.10 is more than 3 years old.

Precise stack marking only became available a year after that.

Miguel


On Fri, Aug 8, 2014 at 5:40 AM, Zoltán Tóth <kotem.tozo at gmail.com> wrote:

> Thank you Miguel for the answer,
>
> So does "MONO_GC_PARAMS=stack-mark=precise" give me TOTALLY precise
> scanning?
> The reasons i insist questioning are that the Release notes page of v_2.10
> [1] says that it gives me only "mostly precise fashion" [though obviously
> its effect could have changed since 2.10]; and in older documentation the
> words "precise" and "mostly precise" seems to be used interchangeably.
>
> [1] - http://www.mono-project.com/Release_Notes_Mono_2.10
>
>
> ----------------------------------------------
>
> Miguel wrote:
>
> This is now controlled with MONO_GC_PARAMS, you can set the variable to
>
> stack-mark=precise
>
> To use precise stack marking.   There are a few reasons that this is not
> the default:
>
>    - Legacy: many applications embedding Mono assumed that icalls/pinvokes
>
>    that manipulated managed objects did not require pinning, so we would
> break
>    those apps.
>
>    - Keeping the stack maps requires more memory.
>
> Miguel
>
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>
>
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