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Implement MADV_FREE in madvise

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This commit is contained in:
Yuke Peng
2024-08-10 10:07:12 +08:00
committed by Tate, Hongliang Tian
parent 75da7fd30e
commit 7b4c13f5d7
1 changed files with 13 additions and 0 deletions
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13
kernel/aster-nix/src/syscall/madvise.rs
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@ -21,11 +21,24 @@ pub fn sys_madvise(start: Vaddr, len: usize, behavior: i32) -> Result<SyscallRet
MadviseBehavior::MADV_DONTNEED => { MadviseBehavior::MADV_DONTNEED => {
warn!("MADV_DONTNEED isn't implemented, do nothing for now."); warn!("MADV_DONTNEED isn't implemented, do nothing for now.");
} }
MadviseBehavior::MADV_FREE => madv_free(start, len)?,
_ => todo!(), _ => todo!(),
} }
Ok(SyscallReturn::Return(0)) Ok(SyscallReturn::Return(0))
} }
fn madv_free(start: Vaddr, len: usize) -> Result<()> {
debug_assert!(start % PAGE_SIZE == 0);
debug_assert!(len % PAGE_SIZE == 0);
let current = current!();
let root_vmar = current.root_vmar();
let advised_range = start..start + len;
let _ = root_vmar.destroy(advised_range);
Ok(())
}
#[repr(i32)] #[repr(i32)]
#[derive(Debug, Clone, Copy, TryFromInt)] #[derive(Debug, Clone, Copy, TryFromInt)]
#[allow(non_camel_case_types)] #[allow(non_camel_case_types)]