fitzgen requested alexcrichton for a review on PR #9484.
fitzgen requested wasmtime-core-reviewers for a review on PR #9484.
fitzgen requested wasmtime-default-reviewers for a review on PR #9484.
fitzgen opened PR #9484 from fitzgen:null-gc
to bytecodealliance:main
:
The null collector does not actually collect any garbage, it simply bump-allocates until the heap is exhausted, at which point further allocation attempts will fail. It does not require any GC barriers.
Users can configure which collector to use via the
wasmtime::Config::collector
method or the-C collector=drc|null
CLI flag. Thewasmtime::Collector
enumeration, similar to thewasmtime::Strategy
enumeration but for choosing a collector rather than a compiler, additionally has a table summarizing the properties and characteristics of our current set of collector implementations.Finally, we also run
.wast
tests that exercise GC types under both the DRC and null collectors. I tried to avoid running tests that are not related to GC under both configurations just to avoid a combinatorial blow up.
(This PR builds on top of https://github.com/bytecodealliance/wasmtime/pull/9483, which is the first commit.)
fitzgen updated PR #9484.
fitzgen updated PR #9484.
fitzgen edited PR #9484:
The null collector does not actually collect any garbage, it simply bump-allocates until the heap is exhausted, at which point further allocation attempts will fail. It does not require any GC barriers.
Users can configure which collector to use via the
wasmtime::Config::collector
method or the-C collector=drc|null
CLI flag. Thewasmtime::Collector
enumeration, similar to thewasmtime::Strategy
enumeration but for choosing a collector rather than a compiler, additionally has a table summarizing the properties and characteristics of our current set of collector implementations.Finally, we also run
.wast
tests that exercise GC types under both the DRC and null collectors. I tried to avoid running tests that are not related to GC under both configurations just to avoid a combinatorial blow up.
fitzgen updated PR #9484.
fitzgen updated PR #9484.
fitzgen updated PR #9484.
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fitzgen updated PR #9484.
fitzgen requested wasmtime-fuzz-reviewers for a review on PR #9484.
fitzgen edited a comment on PR #9484:
Label Messager: wasmtime:config
It looks like you are changing Wasmtime's configuration options. Make sure to
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[ ] If you added a new
Config
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```text
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Optional example here.
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fuzz targets exercises that new strategy.Often, all that is required of you is to ensure that there is a knob for this
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][fuzzing-config] (or one
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fitzgen edited a comment on PR #9484:
Label Messager: wasmtime:config
It looks like you are changing Wasmtime's configuration options. Make sure to
complete this check list:
[x] If you added a new
Config
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```text
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information about not just the method, but its parameters and results as
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Can this method panic? If so, when does it panic?
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Optional example here.
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slot inside the pooling allocator, you should ensure that at least one of our
fuzz targets exercises that new strategy.Often, all that is required of you is to ensure that there is a knob for this
configuration option in [wasmtime_fuzzing::Config
][fuzzing-config] (or one
of its nestedstruct
s).Rarely, this may require authoring a new fuzz target to specifically test this
configuration. See [our docs on fuzzing][fuzzing-docs] for more details.</details>
[ ] If you are enabling a configuration option by default, make sure that it
has been fuzzed for at least two weeks before turning it on by default.[fuzzing-config]: https://github.com/bytecodealliance/wasmtime/blob/ca0e8d0a1d8cefc0496dba2f77a670571d8fdcab/crates/fuzzing/src/generators.rs#L182-L194
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fitzgen edited a comment on PR #9484:
Label Messager: wasmtime:config
It looks like you are changing Wasmtime's configuration options. Make sure to
complete this check list:
[x] If you added a new
Config
method, you wrote extensive documentation for
it.<details>
Our documentation should be of the following form:
```text
Short, simple summary sentence.More details. These details can be multiple paragraphs. There should be
information about not just the method, but its parameters and results as
well.Is this method fallible? If so, when can it return an error?
Can this method panic? If so, when does it panic?
Example
Optional example here.
```</details>
[x] If you added a new
Config
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ensured that this configuration is exercised by the fuzz targets.<details>
For example, if you expose a new strategy for allocating the next instance
slot inside the pooling allocator, you should ensure that at least one of our
fuzz targets exercises that new strategy.Often, all that is required of you is to ensure that there is a knob for this
configuration option in [wasmtime_fuzzing::Config
][fuzzing-config] (or one
of its nestedstruct
s).Rarely, this may require authoring a new fuzz target to specifically test this
configuration. See [our docs on fuzzing][fuzzing-docs] for more details.</details>
[x] If you are enabling a configuration option by default, make sure that it
has been fuzzed for at least two weeks before turning it on by default.[fuzzing-config]: https://github.com/bytecodealliance/wasmtime/blob/ca0e8d0a1d8cefc0496dba2f77a670571d8fdcab/crates/fuzzing/src/generators.rs#L182-L194
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alexcrichton submitted PR review:
Very nice! I like how this shaped up. I hope the
#[cfg]
wasn't too much to add, but it all looks relatively focused to be so it's hopefully just a one-time cost.
alexcrichton created PR review comment:
To confirm this technically isn't necessary right? (to specify
-C collector=drc
)I think it's good to have in the test for future-proofing, but I want to double-check that as-is in isolation this isn't needed if we make no more changes to wasmtime in the future
alexcrichton created PR review comment:
Instead of
self.features()
can you use thefeatures
that are in scope from above?
alexcrichton created PR review comment:
Could this get pushed into a
Result
-return ofConfig::collector
or withinConfig::validate
?
fitzgen submitted PR review.
fitzgen created PR review comment:
Correct, this is just future-proofing for if/when we change the default collector.
fitzgen updated PR #9484.
fitzgen has enabled auto merge for PR #9484.
fitzgen commented on PR #9484:
Very nice! I like how this shaped up.
Thanks!
I hope the
#[cfg]
wasn't too much to add, but it all looks relatively focused to be so it's hopefully just a one-time cost.Indeed, it was mostly some shuffling to get rid of the disabled collector impl and then realizing that various things that were DRC-specific modules could actually be made a little more generic and reused with other collectors. I think adding the copying collector will be relatively small in comparison to this PR, which is kind of funny.
fitzgen updated PR #9484.
fitzgen has enabled auto merge for PR #9484.
fitzgen updated PR #9484.
fitzgen updated PR #9484.
fitzgen has enabled auto merge for PR #9484.
fitzgen updated PR #9484.
fitzgen has enabled auto merge for PR #9484.
fitzgen merged PR #9484.
Last updated: Dec 23 2024 at 12:05 UTC