Documentation/networking/page_pool.rst

File Facts

System

Linux kernel

Corpus path

Documentation/networking/page_pool.rst

Extension

.rst

Size

6242 bytes

Lines

182

Domain

Support Tooling And Documentation

Bucket

Documentation

Inferred role

Support Tooling And Documentation: documentation

Status

atlas-only

Why This File Exists

Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.

• Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.
• Allocates kernel memory; connect allocation flags and lifetime to context constraints.
• Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.

Dependency Surface

• No C-style include directives detected by the generator.

Detected Declarations

• No top-level syscall, struct, function, initcall, or export declaration detected by the generator.

Annotated Snippet

while (done < budget) {
        if (some error)
            page_pool_recycle_direct(page_pool, page);
        if (packet_is_xdp) {
            if XDP_DROP:
                page_pool_recycle_direct(page_pool, page);
        } else (packet_is_skb) {
            skb_mark_for_recycle(skb);
            new_page = page_pool_dev_alloc_pages(page_pool);
        }
    }

Driver unload
-------------

.. code-block:: c

    /* Driver unload */
    page_pool_put_full_page(page_pool, page, false);
    xdp_rxq_info_unreg(&xdp_rxq);

Annotation

• Atlas domain: Support Tooling And Documentation / Documentation.
• Implementation status: atlas-only.

Implementation Notes

• This generated page is the file-by-file coverage layer; curated subsystem chapters should link here when they synthesize a multi-file control flow.
• Core OS pages should be promoted from atlas-only to deep-reviewed when they explain data structures, invariants, locking, lifecycle, and C implementation snippets.
• Driver-family pages are intentionally pattern-oriented unless they are part of the selected PCIe/NVMe representative device path.