mem_cgroup_oom_synchronize(9)

💅 mem_cgroup_oom_synchronize(9) 💅

okay bestie, welcome to the Kernel API Manual entry for mem_cgroup_oom_synchronize(9) — this is the little cleanup-and-finish-line function for memcg OOM handling, and yes, it’s giving very “end of page fault, tie up the loose ends” energy ✨

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🎀 NAME 🎀

mem_cgroup_oom_synchronize — complete memcg OOM handling, periodt 💖

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✨ SYNOPSIS ✨

bool mem_cgroup_oom_synchronize (bool handle );

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🫶 ARGUMENTS 🫶

• handle — actually kill/wait or just clean up the OOM state. lowkey the whole vibe check for this call tbh 💅

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🌸 DESCRIPTION 🌸

okay so here’s the tea: this has to be called at the end of a page fault if the memcg OOM handler was enabled. no cap, that’s the rule 📌

Memcg supports userspace OOM handling where failed allocations must sleep on a waitqueue until the userspace task resolves the situation. and like… sleeping directly in the charge context with all kinds of locks held is not a good idea 🙈 instead, we remember an OOM state in the task, and mem_cgroup_oom_synchronize has to be called at the end of the page fault to complete the OOM handling. that’s the whole point, bestie — finish the OOM situation properly instead of having a chaotic nap in the charge context 💀

Returns true if an ongoing memcg OOM situation was detected and completed, false otherwise. simple as that ✨

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🦋 SEE ALSO 🦋

• Kernel file ./mm/memcontrol-v1.c
• __memcg1_swapout(9)
• memcg1_swapin(9)
• vmpressure_prio(9)
• vmpressure_register_event(9)
• vmpressure_unregister_event(9)

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xoxo, your Unix bestie 💅 — this page is sourced from ./mm, dated October 2026, and filed under mem_cgroup_oom_synchronize(9) in the Kernel API Manual 🎀