snd_pcm_lib...ages_for_all(9)

📦 version 7.3.1, in nixpkgs unstable

💖 NAME 💖

snd_pcm_lib_preallocate_pages_for_all — okay so this is the pre-allocation girly for the continuous memory type, and she does it for all the substreams, not just one. main character energy fr 💅

✨ SYNOPSIS ✨

void snd_pcm_lib_preallocate_pages_for_all (struct snd_pcm *pcm , int
type , void *data , size_t size , size_t max );

🎀 ARGUMENTS 🎀

  • pcm — the pcm instance, bestie. the actual sound card object you're doing all this for 🫶
  • type — the DMA type, and it's one of the SNDRV_DMA_TYPE_* girlies. pick your fighter ✨
  • data — DMA type dependent data. yes it depends on your type, no I will not be elaborating, that's literally the whole vibe 😭
  • size — the requested pre-allocation size, in bytes. the amount you're asking for, periodt 🍓
  • max — the max. allowed pre-allocation size. the ceiling, the limit, the "don't get too comfortable" 💀

🌸 DESCRIPTION 🌸

So what she does is: do pre-allocation to all substreams of the given pcm, for the specified DMA type. That's it, that's the whole thing. One call, every substream, all at once — it's giving efficiency, it's giving group-chat blast energy 🔥

Not me about to say "no cap" in a kernel doc. anyway. all substreams. specified DMA type. pre-allocation. slay 👑

🦋 SEE ALSO 🦋

Kernel file ./sound/core/pcm_memory.c — go read her, she's iconic:

like, the whole friend group is linked, iykyk 💜

ok that's the page!! live laugh love, and remember: pre-allocate responsibly, bestie 🌈

mwah 💋 — this lil masterpiece lives in ./sound/core, dated October 2026, and it's the Kernel API Manual section 9, snd_pcm_lib...ages_for_all(9). byeee 🧚💖

📦 where this page comes from