sk_page_frag(9)

💖 sk_page_frag 💖

okay so bestie, welcome to the Kernel API Manual page for sk_page_frag — it's giving “tiny helper, very important context check” energy, and we're gonna get you comfy with it ✨

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🌸 NAME 🌸

sk_page_frag — return an appropriate page_frag 💅

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✨ SYNOPSIS ✨

struct page_frag * sk_page_frag (struct sock *sk );

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🎀 ARGUMENTS 🎀

• sk — socket. That's the whole argument, bestie, just a socket 🫶

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🦋 DESCRIPTION 🦋

Use the per task page_frag instead of the per socket one for optimization when we know that we're in process context and own everything that's associated with current. Yes, this is the “we can flex the per task one” situation ✨

⚠️ Important recursion tea: both direct reclaim and page faults can nest inside other socket operations and end up recursing into sk_page_frag while it's already in use: explicitly avoid task page_frag when users disable sk_use_task_frag. No cap, that's the caveat.

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💖 RETURN 💖

A per task page_frag if context allows that, otherwise a per socket one. That's the whole return vibe check 👑

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🌈 SEE ALSO 🌈

Kernel file ./include/net/sock.h — plus the whole friend group:

• struct sock_common(9)
• struct sock(9)
• sk_user_data_is_nocopy(9)
• __locked_read_sk_user_data_with_flags(9)
• __rcu_dereference_sk_user_data_with_flags(9)
• sk_for_each_entry_offset_rcu(9)
• SOCK_CONNECT_BIND(9)
• lock_sock_fast(9)
• unlock_sock_fast(9)
• sk_wmem_alloc_get(9)
• sk_rmem_alloc_get(9)
• sk_has_allocations(9)
• skwq_has_sleeper(9)
• sock_poll_wait(9)
• _sock_tx_timestamp(9)
• sk_eat_skb(9)

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That's the page, bestie 🎀 It's from ./include/net, dated October 2026, and it's sk_page_frag(9) — mwah 💋