ttm_resourc...dmem_reclaim(9)

💅 ttm_resource_manager_dmem_reclaim — the Kernel API Manual, bestie edition 🎀

okay so real talk, this is ttm_resource_manager_dmem_reclaim(9) from the Kernel API Manual, and it's literally the dmem cgroup reclaim callback for TTM resource managers. say that five times fast, i dare you 🫶

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✨ NAME ✨

ttm_resource_manager_dmem_reclaim — the dmem cgroup reclaim callback for TTM resource managers. that's it, that's the whole vibe 🌸

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🌈 SYNOPSIS 🌈

int ttm_resource_manager_dmem_reclaim (struct dmem_cgroup_pool_state
*pool , u64 target_bytes , void *priv );

like, copy it exactly, no cap — every punctuation mark matters here 💀

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🦋 ARGUMENTS 🦋

• pool — the dmem cgroup pool state for the cgroup that's getting reclaimed. yes, that cgroup. the one being reclaimed. it's giving "main character under memory pressure" 😭
• target_bytes — a u64 — the number of bytes we're trying to free. try being the operative word, bestie 🙈
• priv — the ttm_resource_manager pointer, passed as init.reclaim_priv to dmem_cgroup_register_region. so this is where your manager pointer comes back home 🏠✨

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💖 DESCRIPTION 💖

okay so here's the tea ☕ — drivers should use this as the reclaim member of their own struct dmem_cgroup_ops, with the ttm_resource_manager pointer as init.reclaim_priv.

that's literally it. no extra lore. slay 💅

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🔥 RETURN 🔥

• 0 — some memory was freed. iconic, we love a success story 👑
• -ENOSPC — nothing was freed. tragic, but valid 💀
• another negative error code — fatal failure. not the vibe, but it's documented fr fr 😭

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💜 SEE ALSO 💜

Kernel file ./drivers/gpu/drm/ttm/ttm_resource.c — go read it, iykyk 📖

and the whole friend group:

ttm_resource_cursor_init(9), ttm_resource_cursor_fini(9), ttm_lru_bulk_move_init(9), ttm_lru_bulk_move_fini(9), ttm_lru_bulk_move_tail(9), ttm_resource_init(9), ttm_resource_fini(9), ttm_resource_try_charge(9), ttm_resource_intersects(9), ttm_resource_compatible(9), ttm_resource_manager_init(9), ttm_resource_manager_usage(9), ttm_resource_manager_debug(9), ttm_resource_manager_first(9), ttm_resource_manager_next(9), ttm_lru_first_res_or_null(9), ttm_kmap_iter_iomap_init(9), Linear io iterator(9), ttm_kmap_iter_linear_io_init(9), ttm_kmap_iter_linear_io_fini(9), ttm_resource_manager_create_debugfs(9), ttm_resource_manager_set_dmem_region(9)

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lowkey a whole squad of TTM functions. bring snacks, you'll be here a while 🍓

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and that's the page, bestie 🧚 from the folks over at ./drivers/gpu/drm/ttm, dated October 2026 — mwah, catch you in the next manpage 💋✨🎀