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Introduce API for custom stack memory #7209

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merged 6 commits into from Oct 11, 2023
Merged

Introduce API for custom stack memory #7209

merged 6 commits into from Oct 11, 2023

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rockwotj
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Introduces an API to allow embedders to allocate stacks for fibers using custom memory instead of mmap.

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@rockwotj rockwotj requested review from a team as code owners October 10, 2023 16:47
@rockwotj rockwotj requested review from alexcrichton and removed request for a team October 10, 2023 16:47
@rockwotj rockwotj force-pushed the custom-stack-memory branch 4 times, most recently from 65540ca to 4f7e6f1 Compare October 10, 2023 17:05
rockwotj
rockwotj commented Oct 10, 2023
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crates/c-api/src/config.rs
);
match error {
None => {
let memory = unsafe { memory.assume_init() };
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This is a much safer API, because we don't need to assume they will sent env and finalizer to nullptr if they don't need them.

@github-actions github-actions bot added wasmtime:api Related to the API of the `wasmtime` crate itself wasmtime:c-api Issues pertaining to the C API. wasmtime:config Issues related to the configuration of Wasmtime labels Oct 10, 2023
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This issue or pull request has been labeled: "wasmtime:api", "wasmtime:c-api", "wasmtime:config"

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@rockwotj
Introduce StackMemory and StackMemoryCreator
66b3072 
This allows custom implementations of stack memory to be plugged into
the async functionality for wasmtime. Currently, stacks are always
mmapped, and this custom allocator allows embedders to use any memory
they would like.

The new APIs are also exposed in the C api.

This has no effect on windows, as our hands are tied with fibers there.

Signed-off-by: Tyler Rockwood <rockwood@redpanda.com>
@rockwotj
Add test for custom host memory
c4fb9db 
Signed-off-by: Tyler Rockwood <rockwood@redpanda.com>
@rockwotj
fix allocator test
4cfdfc4 
Signed-off-by: Tyler Rockwood <rockwood@redpanda.com>
fitzgen
fitzgen reviewed Oct 10, 2023
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(Going to leave the C API bits to Alex to review)

crates/fiber/src/unix.rs Outdated Show resolved Hide resolved
crates/wasmtime/src/stack.rs Outdated Show resolved Hide resolved
crates/wasmtime/src/trampoline.rs Outdated Show resolved Hide resolved
tests/all/stack_creator.rs Outdated Show resolved Hide resolved
crates/fiber/src/unix.rs Outdated Show resolved Hide resolved
crates/fiber/src/unix.rs Outdated Show resolved Hide resolved
@rockwotj rockwotj requested a review from fitzgen October 10, 2023 21:06
@rockwotj
Address review comments
a793be8 
Signed-off-by: Tyler Rockwood <rockwood@redpanda.com>
fitzgen
fitzgen approved these changes Oct 11, 2023
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Nice! I looked through the C API changes in more detail as well, and they look good as well.

Thanks @rockwotj!

@fitzgen fitzgen added this pull request to the merge queue Oct 11, 2023
@github-merge-queue github-merge-queue bot removed this pull request from the merge queue due to failed status checks Oct 11, 2023
@rockwotj
Fix lint warnings
d8166c8 
prtest:full

Signed-off-by: Tyler Rockwood <rockwood@redpanda.com>
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Thanks @fitzgen! I messed up some lint warnings when the async config is disabled. I've fixed them now.

@rockwotj
fix windows lint warning
f5a460f 
prtest:full

Signed-off-by: Tyler Rockwood <rockwood@redpanda.com>
@fitzgen fitzgen added this pull request to the merge queue Oct 11, 2023
Merged via the queue into bytecodealliance:main with commit e6ff841 Oct 11, 2023
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@rockwotj rockwotj deleted the custom-stack-memory branch October 11, 2023 20:38
This was referenced Oct 12, 2023
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@fitzgen fitzgen fitzgen approved these changes

@alexcrichton alexcrichton Awaiting requested review from alexcrichton alexcrichton is a code owner automatically assigned from bytecodealliance/wasmtime-core-reviewers

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