nfsd_stats_d...em_usage_sub(9)

💅 nfsd_stats_d...em_usage_sub(9) — the Kernel API Manual page, bestie edition ✨

okay so picture this: you're deep in the kernel docs, the manual is literally called Kernel API Manual, and you stumble on a page with a name so long it got truncated — nfsd_stats_d...em_usage_sub(9). iconic honestly. anyway, let's get into it 🫶

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✨ NAME ✨

nfsd_stats_drc_mem_usage_sub — bestie, this one does exactly one thing: it subtracts memory used by a cache item. that's it. that's the whole gig. 💅

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🦋 SYNOPSIS 🦋

void nfsd_stats_drc_mem_usage_sub (struct nfsd_net *nn , s64 amount );

like, look at her. void return, two args, zero drama. she's giving functional. 🎀

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🌸 ARGUMENTS 🌸

• nn — the target network namespace, i.e. the vibe check of which namespace we're subtracting from. 🌈
• amount — the byte count. literally just how many bytes you're taking off the books. s64. no cap. 🍓

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💖 DESCRIPTION 💖

so here's the tea: this page says see nfsd_stats_drc_mem_usage_add for batching rationale. that's it, that's the description. the docs are being mysterious and honestly? main character energy of them. 🙈

ngl, if you need the why behind the batching, you gotta go read nfsd_stats_drc_mem_usage_add — this page is not about to explain it twice. ✨

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👑 SEE ALSO 👑

okay the friend group is large and I love them all:

• Kernel file ./fs/nfsd/stats.h
• nfsd_stats_rc_hits_inc(9)
• nfsd_stats_rc_misses_inc(9)
• nfsd_stats_rc_nocache_inc(9)
• nfsd_stats_io_read_add(9)
• nfsd_stats_io_write_add(9)
• nfsd_stats_drc_mem_usage_add(9)

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💀 reminder: the name up top really is truncated like that. nfsd_stats_d...em_usage_sub(9) is not me being lazy, it's literally what the page is filed under. iykyk.

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🧚 a little sign-off 🎀

this little love letter comes to you from ./fs/nfsd, dated October 2026, living its best life as page nfsd_stats_d...em_usage_sub(9) in the Kernel API Manual — go subtract those bytes responsibly, bestie, and slay 💜⭐🔥