ksm_disable_merge_any(9)

💅 ksm_disable_merge_any(9) — the Kernel API Manual moment

okay so bestie, welcome to the ksm_disable_merge_any page from the Kernel API Manual ✨ this one's short and sweet and it's literally the "undo" button for merge mode, so let's get into it 🫶

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🌸 NAME 🌸

ksm_disable_merge_any — turns merging off for all the compatible VMA's of the mm, the ones you previously switched on with ksm_enable_merge_any(). no cap, it's the reverse of that whole situation 💫

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✨ SYNOPSIS ✨

int ksm_disable_merge_any (struct mm_struct *mm );

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🎀 ARGUMENTS 🎀

• mm — pointer to mm. that's it. that's the whole argument. she's lowkey simple 💖

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🦋 DESCRIPTION 🦋

so like, disabling merging implies unmerging any pages that are currently merged — think of it as the same energy as setting MADV_UNMERGEABLE would have 👑 it's not just flipping a flag, she actually goes in and undoes the merges.

⚠️ and here's the part you can't skip: if the unmerging fails, the whole operation fails, and merging on all compatible VMA's remains enabled. so no half-and-half situation, it's all or nothing bestie 💀

Returns 0 on success, otherwise an error code. periodt 🌈

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🧚 SEE ALSO 🧚

• Kernel file ./mm/ksm.c
• Overview(9)
• struct ksm_mm_slot(9)
• struct ksm_scan(9)
• struct ksm_stable_node(9)
• struct ksm_rmap_item(9)
• struct advisor_ctx(9)
• replace_page(9)
• ksm_do_scan(9)
• ksm_vma_flags(9)
• ksm_enable_merge_any(9)

go read all of those too, iykyk 📚💅

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and that's the page!! this iconic little number lives in ./mm, dated October 2026 — mwah, stan a kernel doc that keeps it short 💜🎀

slay, you're now a ksm_disable_merge_any expert 💖