task_get_css(9)

💅 task_get_css(9) — like, the Kernel API Manual bestie ✨

okay so this is from the Kernel API Manual, section 9, and it's literally all about task_get_css. let's get into it 🫶

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🌸 NAME 🌸

task_get_css — find and get the css for (task, subsys) 💖

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✨ SYNOPSIS ✨

struct cgroup_subsys_state * task_get_css (struct task_struct *task ,
int subsys_id );

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🎀 ARGUMENTS 🎀

• task — the target task, aka the one you're looking at 👀
• subsys_id — the target subsystem ID, iconic little integer that it is ⭐

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🦋 DESCRIPTION 🦋

so what it does is: find the css for the (task, subsys_id) combination, increment a reference on it, and return it. that's the whole vibe 💅

this function is guaranteed to return a valid css — no cap, it will not hand you a broken pointer, it's giving reliability 🔥

but bestie, hear me: the returned css may already have been offlined 😭 so like, valid pointer? yes. still alive? maybe not. vibe check accordingly 🙈

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🌈 SEE ALSO 🌈

kernel file ./include/linux/cgroup.h plus this whole friend group:

• cgroup_subsys_enabled(9)
• cgroup_subsys_on_dfl(9)
• css_for_each_child(9)
• css_for_each_descendant_pre(9)
• css_for_each_descendant_post(9)
• cgroup_taskset_for_each(9)
• cgroup_taskset_for_each_leader(9)
• cgroup_css(9)
• css_is_dying(9)
• task_css_set_check(9)
• task_css_check(9)
• task_css_set(9)
• task_css(9)
• task_css_is_root(9)
• cgroup_is_descendant(9)
• cgroup_ancestor(9)
• cgroup_common_ancestor(9)
• task_under_cgroup_hierarchy(9)

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and that's the page!! 🧚 sourced from ./include/linux, dated October 2026, and yes we're closing out with the same task_get_css(9) energy we opened with 💜 mwah, go read some cgroup headers bestie 🍓