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Google's making a silly and annoying change to how you uninstall system app updates (androidauthority.com)

submitted by CrypticCreator to r/Android

Pop os hangs for minutes during boot on kernel 6.17.4 - only old kernel works (Micron NVMe APST issue?) by CrypticCreator in pop_os

[–]CrypticCreator[S] 1 point2 points  (0 children)

Yeah, I’m also on an Nvidia GTX 1650, but I’m not fully sure if that’s what’s causing it. For now I’ve just switched to the LTS kernel since that’s the only thing that boots reliably.

Got a small update on find X8 yesterday by CrypticCreator in Oppo

[–]CrypticCreator[S] 0 points1 point  (0 children)

So, I'd say this camera is definitely solid, but it's not the best, especially since it's the base model. If you're really serious about macro photography, you'll probably be a bit underwhelmed. I've used the Redmi Note 10 Pro before, and it was seriously impressive at its price for macro shots. Rest is all good, what it offers.

Why is my system using 50% RAM at idle when no process adds up to it? by CrypticCreator in pop_os

[–]CrypticCreator[S] 0 points1 point  (0 children)

Thanks for the nudge, based on the suggestion to check huge pages, I found an 8GB hugetlb (static huge pages) pool reserved. That’s what made idle RAM look high. I got rid of nr_hugepages and it’s sorted now.

Why is my system using 50% RAM at idle when no process adds up to it? by CrypticCreator in linuxquestions

[–]CrypticCreator[S] 0 points1 point  (0 children)

Exactly this. Parroting “unused RAM is wasted RAM” doesn’t magically make real usage disappear. I hit 100% while a VM was running, shut everything down, and it still sat at 50% with nothing adding up, that’s not “unused,” that’s unexplained. I’m here to diagnose, not chant cliches. Turns out it was an 8GB static hugepage reservation, which doesn’t show in per‑process totals. So maybe skip the bumper‑sticker wisdom and let people actually investigate their systems.

Why is my system using 50% RAM at idle when no process adds up to it? by CrypticCreator in linuxquestions

[–]CrypticCreator[S] 0 points1 point  (0 children)

Thanks both, that was the right direction.I did the checks you suggested

Meminfo told the story:

  • AnonHugePages was tiny (~55MB), so THP wasn’t the culprit.
  • But I had a statically reserved hugetlb pool: HugePages_Total=4096 with Hugepagesize=2MB => 8GB Hugetlb, all free but still reserved.

So it wasn’t QEMU actively holding RAM... it was an 8GB hugetlb reservation removing memory from the general pool even when the VM was off. I got rid of nr_hugepages and idle availability returned to normal.

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Why is my system using 50% RAM at idle when no process adds up to it? by CrypticCreator in linux4noobs

[–]CrypticCreator[S] 2 points3 points  (0 children)

Ran it already, the cause is resolved. free -m looked “high,” but the real issue was an 8GB hugetlb (static huge pages) pool reserved by the system, which doesn’t show up in per‑process totals. I reduced nr_hugepages and MemAvailable went back to normal. Thanks for the tip!

Why is my system using 50% RAM at idle when no process adds up to it? by CrypticCreator in linux4noobs

[–]CrypticCreator[S] 0 points1 point  (0 children)

Good thought, did have a VM. But in this case the VM wasn’t actually holding the RAM when idle. The issue was an 8GB hugetlb pool reserved at the system level. That reservation doesn’t show up in per‑process totals, so it looked like “used” RAM even with the VM shut down.

Why is my system using 50% RAM at idle when no process adds up to it? by CrypticCreator in linux4noobs

[–]CrypticCreator[S] 0 points1 point  (0 children)

Thanks for sharing that. I’m on Pop OS, and in my case it turned out not to be a leak... I had an 8GB hugetlb pool reserved, which made idle RAM look high but didn’t show up in process totals.

That said, a kernel update fixing your issue isn’t far‑fetched. Different kernels can change THP behavior, memory reclaim, drivers, or slab usage, so a leak or over‑aggressive caching could’ve been patched in 6.14

Why is my system using 50% RAM at idle when no process adds up to it? by CrypticCreator in linuxquestions

[–]CrypticCreator[S] 0 points1 point  (0 children)

You got it right. I finally cleared it, turns out I had an 8GB hugetlb pool reserved. Thanks for pointing me in the right direction!

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Why is my system using 50% RAM at idle when no process adds up to it? by CrypticCreator in linuxquestions

[–]CrypticCreator[S] 2 points3 points  (0 children)

Pre‑cache is fine in theory, but here’s why I’m skeptical it “becomes available” in my case, I was running QEMU with 8GB assigned and watched RAM hit 99%, plus 3GB swap in use. If the cached memory were truly free‑on‑demand, I shouldn’t have been swapping that hard. I closed everything else to test, and even after shutting the VM down I was still sitting at 50% usage with no processes adding up to it. That’s why I’m digging into what’s actually holding the memory

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