unsafe fn madvise_aligned(base_ptr: *const u8, len_bytes: usize, advice: c_int)Available on Linux and Unix and crate feature
pager only.Expand description
Issues madvise(advice) over the page-aligned interior of the byte range
[base_ptr, base_ptr + len_bytes). madvise operates at page granularity,
so the start rounds up and the end rounds down to page boundaries; a range
that contains no whole page is skipped so we never advise pages we only
partially own.
§Safety
base_ptr must point to the start of a live allocation of at least
len_bytes bytes that stays valid for the duration of the call. advice
must be a non-mutating hint (MADV_COLD/MADV_PAGEOUT): both only change
the kernel’s reclaim decision and leave the bytes readable, so concurrent
reads of the range remain sound.