Method decrease_vmsize

tee/kernel/src/user/process/usage.rs:78–82

(&self, delta: usize)

    }

    pub fn decrease_vmsize(&self, delta: usize) {
        let delta = u64::from_usize(delta);
        let prev = self.vmsize.fetch_sub(delta, Ordering::Relaxed);
        debug_assert!(prev >= delta);
    }

    pub fn vmsize(&self) -> u64 {
        self.vmsize.load(Ordering::Relaxed)