ttm_bo_evict_cgroup(9)

📦 version 7.3.1, in nixpkgs unstable

💅 ttm_bo_evict_cgroup(9) — from the Kernel API Manual, bestie

okay so picture this: it's a ttm_bo function, it's in the kernel, and it is literally here to evict buffer objects that are charged to one specific cgroup. yes queen, targeted eviction. let's get into it 🎀

✨ NAME ✨

ttm_bo_evict_cgroup — Evict buffer objects charged to a specific cgroup.

🌸 SYNOPSIS 🌸

s64 ttm_bo_evict_cgroup (struct ttm_device *bdev , struct
ttm_resource_manager *man , struct dmem_cgroup_pool_state *limit_pool ,
s64 target_bytes , struct ttm_operation_ctx *ctx );

she takes five args and returns an s64, no cap 🫶

🦋 ARGUMENTS 🦋

  • bdev — The TTM device. the main character of this whole situation tbh.
  • man — The resource manager whose LRU to walk. yes you're walking her LRU, be respectful 💅
  • limit_pool — The cgroup pool state whose members should be evicted. like, these are the ones getting the vibe check.
  • target_bytes — Number of bytes to free. the goal. the dream. the quota.
  • ctx — The TTM operation context.

💖 DESCRIPTION 💖

so what she does is: walk the LRU of man and evict buffer objects that are charged to the cgroup identified by limit_pool, until at least target_bytes have been freed. periodt. 🎯

and the way she does it? she mirrors the two-pass (trylock -> sleeping-lock, low-watermark) strategy used by ttm_bo_evict_alloc. iconic behavior honestly, she learned from the best 🌈

👑 RETURN 👑

  • >= target_bytes — on full success, she ate and left no crumbs 💀
  • 0..target_bytes-1 — if partial. she tried, bestie 😭
  • negative error code — on fatal error. yeah… that's a no from her 🙈

⭐ SEE ALSO ⭐

Kernel file ./drivers/gpu/drm/ttm/ttm_bo.c — and the whole friend group:

ngl if you got this far you're lowkey a TTM girlie now. go read ttm_bo_evict_alloc next, it's giving sequel energy 🧚

and that's the page!! brought to you by ./drivers/gpu/drm/ttm, stamped October 2026, filed under ttm_bo_evict_cgroup(9) — mwah 💋 slay safe out there 🍓

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