dmem_cgroup_...ict_valuable(9)

💅 dmem_cgroup_state_evict_valuable — Kernel API Manual, bestie edition 🎀

okay so this is a page from the Kernel API Manual (yes, the actual kernel, we're literally in ./kernel/cgroup/dmem.c territory, main character energy) and it's about the very serious business of deciding whether to evict stuff from a pool. grab a strawberry drink 🍓 and let's go.

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✨ NAME ✨

dmem_cgroup_state_evict_valuable — the vibes check that tells you whether we should evict from test_pool. fr fr that's the whole job.

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🌸 SYNOPSIS 🌸

bool dmem_cgroup_state_evict_valuable (struct dmem_cgroup_pool_state
*limit_pool , struct dmem_cgroup_pool_state *test_pool , bool ignore_low
, bool *ret_hit_low );

like, it takes four things and gives you back a bool. no cap.

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🦋 ARGUMENTS 🦋

• limit_pool — the pool where we actually hit the limits 👑 this is the one that's causing the whole situation.
• test_pool — the pool we're testing, i.e. the candidate we're lowkey side-eyeing to see if it's evictable.
• ignore_low — whether we have to respect low watermarks. yes, this is a real thing we care about 🙈
• ret_hit_low — a pointer to a bool that says whether it even makes sense to consider the low watermark. it's giving "output parameter, but make it cute."

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💖 DESCRIPTION 💖

So here's the tea ☕ — this function returns true if we can evict from test_pool, and false if we can't. simple as that, periodt.

But wait, there's a plot twist 😭 — when it returns false and ignore_low is false, ret_hit_low may be set to true. and what does that mean? it means you can literally retry this function with ignore_low set to true. it's giving "second chance, bestie" ✨. note the "may" — that's the function being coy, not me making stuff up.

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⭐ RETURN ⭐

bool

that's it. that's the return. iconic. 👑

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🌈 SEE ALSO 🌈

the source of truth lives in the kernel file ./kernel/cgroup/dmem.c — go read it, it's right there, iykyk 💜

• dmem_cgroup_unregister_region(9)
• dmem_cgroup_register_region(9)
• dmem_cgroup_pool_state_put(9)
• dmem_cgroup_uncharge(9)
• dmem_cgroup_try_charge(9)
• dmem_cgroup_below_min(9)
• dmem_cgroup_below_low(9)
• dmem_cgroup_get_common_ancestor(9)

like a whole friend group of functions, honestly 🫶

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🫶 cute little sign-off: this page lives under ./kernel/cgroup, dated October 2026, and its manual name is dmem_cgroup_...ict_valuable(9). mwah 💋 go evict responsibly, bestie 💅✨