mpol_shared_policy_init(9)

💅 mpol_shared_policy_init — like, the shared policy glow-up for your inode ✨

okay bestie, welcome to the Kernel API Manual entry for mpol_shared_policy_init(9) — yes that whole manual, we're doing this 🎀

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🌸 NAME 🌸

mpol_shared_policy_init — initialize shared policy for inode. that's it, that's the whole vibe check 💖

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✨ SYNOPSIS ✨

void mpol_shared_policy_init (struct shared_policy *sp , struct mempolicy *mpol );

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🫶 ARGUMENTS 🫶

• sp — pointer to inode shared policy. it's giving "where the magic happens" ✨
• mpol — the struct mempolicy to install. this is the main character fr 👑

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💀 DESCRIPTION 💀

okay so here's the tea 🍓: you install a non-NULL mpol in the inode's shared policy rb-tree. literally just slot it in there, no cap.

ngl, there's a little caveat you cannot skip — on entry, the current task has a reference on a non-NULL mpol, and this must be released on exit. 🙈 like, do not forget, bestie, that's a leak waiting to happen.

the way this works: it's called at get_inode calls, and because of that we can use GFP_KERNEL. slay, convenient allocation context, we love to see it 💅

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🔥 SEE ALSO 🔥

• Kernel file ./mm/mempolicy.c 👀
• numa_nearest_node(9)
• nearest_node_nodemask(9)
• folio_can_map_prot_numa(9)
• alloc_pages_mpol(9)
• vma_alloc_folio(9)
• alloc_pages(9)
• mpol_misplaced(9)
• mpol_parse_str(9)
• mpol_to_str(9)

like, the whole friend group, honestly 🦋

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mwah 💋 that's the page — sourced from ./mm, dated October 2026, and yes this manual is Kernel API Manual energy through and through. go forth and initialize those shared policies, icon 💜