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Add some stubs for `madvise`.

This commit is contained in:
Chaoqun Zheng 2025-12-08 09:48:24 +08:00 committed by Tate, Hongliang Tian
parent 3235175fcf
commit e1633e7707
3 changed files with 16 additions and 4 deletions
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8
book/src/kernel/linux-compatibility/syscall-flag-coverage/memory-management/README.md
View File

@ -90,18 +90,18 @@ Supported functionality in SCML:
Silently-ignored advice:
* `MADV_DONTNEED`
* `MADV_NOHUGEPAGE`
* `MADV_HUGEPAGE`
* `MADV_MERGEABLE`
* `MADV_DONTFORK`
Unsupported advice:
* `MADV_RANDOM`
* `MADV_REMOVE`
* `MADV_DONTFORK`
* `MADV_DOFORK`
* `MADV_HWPOISON`
* `MADV_MERGEABLE`
* `MADV_UNMERGEABLE`
* `MADV_SOFT_OFFLINE`
* `MADV_HUGEPAGE`
* `MADV_NOHUGEPAGE`
* `MADV_DONTDUMP`
* `MADV_DODUMP`
* `MADV_FREE`

3
book/src/kernel/linux-compatibility/syscall-flag-coverage/memory-management/madvise.scml
View File

@ -6,3 +6,6 @@ madvise(addr, length, advice = MADV_SEQUENTIAL);
// Prefetch pages for near-future access to reduce latency
madvise(addr, length, advice = MADV_WILLNEED);
// Mark pages for lazy reclamation to allow the kernel to free them under memory pressure
madvise(addr, length, advice = MADV_FREE);

9
kernel/src/syscall/madvise.rs
View File

@ -48,6 +48,15 @@ pub fn sys_madvise(
MadviseBehavior::MADV_NOHUGEPAGE => {
warn!("MADV_NOHUGEPAGE isn't implemented, do nothing for now");
}
MadviseBehavior::MADV_HUGEPAGE => {
warn!("MADV_HUGEPAGE isn't implemented, do nothing for now");
}
MadviseBehavior::MADV_MERGEABLE => {
warn!("MADV_MERGEABLE isn't implemented, do nothing for now");
}
MadviseBehavior::MADV_DONTFORK => {
warn!("MADV_DONTFORK isn't implemented, do nothing for now");
}
_ => todo!(),
}
Ok(SyscallReturn::Return(0))