blkcg_set_delay(9)

💅 blkcg_set_delay — the Kernel API Manual edition, bestie ✨

okay so real talk, this one's from the Kernel API Manual (section 9, kernel-functions energy), and it's lowkey a little diva function. let's get into it 🎀

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✨ NAME ✨

blkcg_set_delay — turns on the allocator delay mechanism with the exact delay amount you hand it. that's the whole gig. no cap 🫶

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🌸 SYNOPSIS 🌸

void blkcg_set_delay (struct blkcg_gq *blkg , u64 delay );

like... that's it. void return, two args, she's simple and she knows it 💅

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🦋 ARGUMENTS 🦋

• blkg — the target blkg. the main character of this operation, fr fr 👑
• delay — the delay duration, measured in nsecs (nanoseconds, bestie, we're down to the nano level here ⏱️✨)

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💜 DESCRIPTION 💜

so when you enable this thing with this function, hear me out: the delay is not decayed. like, it does not fade, it does not shrink, it does not gently let itself out — nothing. it just sits there 🌈

because of that, you have to explicitly clear it with blkcg_clear_delay. no auto-cleanup, no self-care, you gotta do the work yourself 😤

⚠️ also and this is the important part: Must not be mixed with blkcg_[un]use_delay and blkcg_add_delay usages. like do not. do not do that. the vibes will be rancid and it's giving undefined-behavior-adjacent chaos 💀 keep your delay mechanisms in separate lanes, iykyk 🙈

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🔥 SEE ALSO 🔥

the whole friend group, in order, exactly as listed:

• Kernel file ./block/blk-cgroup.h
• bio_issue_as_root_blkg(9)
• blkg_lookup(9)
• blkg_to_pd(9)
• pd_to_blkg(9)
• blkg_get(9)
• blkg_tryget(9)
• blkg_put(9)
• blkg_for_each_descendant_pre(9)
• blkg_for_each_descendant_post(9)
• blkcg_clear_delay(9)
• blk_cgroup_mergeable(9)

like genuinely go read blkcg_clear_delay(9) next, she's literally the cleanup crew for this one 🧹💖

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and that's the page, bestie!! sourced fresh from ./block, dated October 2026, filed under blkcg_set_delay(9) — slay, go touch some block cgroups, ily, bye 🎀🫶⭐