[core] Add IO URing based mmap prefetch for Linux

[t-jankowski]

Details:

• Implements io_populate_mmap using io_uring on Linux to prefetch memory-mapped file regions via MADV_POPULATE_READ, replacing the previous stub.
• Adds benchmark comparing io uring with parallel page touch via util::vm_prefetch.

Changes

• cmake/features.cmake: Adds a new ENABLE_IO_URING CMake option (Linux-only, off by default).
• src/common/util/CMakeLists.txt: Links liburing and defines ENABLE_IO_URING when the option is enabled.
• src/common/util/src/os/lin/lin_io.cpp: Implements io_populate_mmap using io_uring_prep_madvise with MADV_POPULATE_READ to submit async prefetch requests in configurable-depth batches. Falls back to madvise(MADV_SEQUENTIAL | MADV_WILLNEED) when io_uring is unavailable or queue init fails.
• src/core/tests/file_load_benchmark.cpp: Adds a benchmark that compares io_uring prefetch against page-touch (thread-based) prefetch across file sizes of 10 MB–1 GB and multiple queue depths.

Notes

• Requires Linux kernel ≥ 5.14 for MADV_POPULATE_READ support; falls back gracefully on older kernels.
• Controlled at build time via -DENABLE_IO_URING=ON; no runtime behavior change when disabled.

Tickets:

• CVS-186700

AI Assistance:

• *AI assistance used: yes
  problem analysis, code generation

[Copilot]

Pull request overview

Adds an optional Linux-only io_uring implementation for prefetching memory-mapped regions (MADV_POPULATE_READ), plus a benchmark to compare it against parallel page-touch prefetch, controlled by a new ENABLE_IO_URING CMake option.

Changes:

• Introduces ENABLE_IO_URING (Linux-only, OFF by default) to gate io_uring support at build time.
• Implements ov::util::io_populate_mmap on Linux using io_uring_prep_madvise(..., MADV_POPULATE_READ) with a madvise-based fallback.
• Extends the file load benchmark to compare io_uring prefetch vs. thread-based page touching when io_uring is enabled.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
cmake/features.cmake	Adds ENABLE_IO_URING build option (Linux-only).
src/common/util/CMakeLists.txt	Wires the option into util build (defines macro, links liburing).
src/common/util/src/os/lin/lin_io.cpp	Implements Linux io_populate_mmap via io_uring + fallback.
src/core/tests/CMakeLists.txt	Propagates ENABLE_IO_URING define to the benchmark target.
src/core/tests/file_load_benchmark.cpp	Adds an io_uring vs page-touch benchmark section gated by ENABLE_IO_URING.

[Copilot]

Pull request overview

Copilot reviewed 5 out of 5 changed files in this pull request and generated 4 comments.