Daily Lockups - kswapd & Memory leaks
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So turns out the swap showing on our Pixel3's is ZRam (Fake swap on memory that is compressed). The 100 setting is appropriate for this setup. Will keep digging around for some way to prevent 100% use ... (which is the source of my lockups).
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So I built a routine that allowed me to reproduce the lockups (where the swap use shown in top (zram) hits 100%, and memory is 95+% used) - it basically involves opening a bunch of webapps / apps that I use; but all at once in fast sequence. The camera is one app that needs a bunch of memory ... and can easily push the device over the edge).
I then tweaked memory control parameters as per various suggestions found online and repeated the test. I was able to get a lot further before lockup with the settings below. (The phone uses less zram as I progress through my test, I guess ultimately pushing back the time to lockup). I haven't noticed any performance hit (purely subjective), and I can run many days now without lockup. On the one occasion where I did lockup, recovery was faster (rather than 1-3 mins, it was ~10 seconds)l; however I did notice one of my open apps was killed (white page with green triangle saying refresh). Haven't figured out how to set this across boots - although my reboots are a lot less frequent!
Disclaimer: This is for the pixel3a - that has 4GB of RAM and ~ 1.6GB zram setup. Based on my reading, I think some of these settings are very specific towards hardware (memory, cpu, swap vs. zram) on the device... also, I am a hack wrt linux and have NO other experience with these settings:)
sudo sysctl vm.min_free_kbytes=29620 &&
sudo sysctl vm.vfs_cache_pressure=200 &&
sudo sysctl vm.dirty_background_ratio=3 &&
sudo sysctl vm.dirty_ratio=40 &&
sudo sysctl vm.admin_reserve_kbytes=16384 &&
sudo sysctl vm.swappiness=80Hope this helps ...
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@standupmobile
Is this problem solved? No more freezes?Critics are the true Positives | OnePlus 3T, Lumia 950
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@3t_ed yes, at least we found out what happened with apps locking up everything, while in reality there was no low-memory killer active. I enabled it and it's available in devel or even release candidate already.
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@fredldotme
Great! Thank you for letting me know. That's good news so thank you for sorting out this issue. I'm still on stable channel but I assume we'll notice with the next OTA? -
Thank you @fredldotme !
What are the gitlab or github links that fix the problem(s). I don't seem to see this in OTA-23 project anyway. -
@3t_ed To elaborate a bit further: First, Alfred applied those changes to the port. One OR 2 did not stick properly and rather than chasing down the issue further, he remove zram completely. So the dev version of p3a is no longer using any swap. There are no more lockups, but (IMHO) there is a little less bandwidth for multitasking, especially after a few days of uptime (where presumably software memory leaks have chewed into the avail 4GB of ram. All in all a big improvement ... would be good if some other could test and chime in their thoughts.
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@standupmobile
Thanks. I followed up on your advice and am now on RC 673 to check if daily lockups have gone and check for lagging in multitasking. Will report back after the weekend. -
The actual fix was this one: https://github.com/fredldotme/android_kernel_google_bonito/commit/944dd258c369ed224b37a9fa439a64c919ad4f27
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@fredldotme On which phones does this fix apply? The Volla too ? If yes, on the current RC ? Thanks in advance to clarify.
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@domubpkm Well since currently this is a device specific change it doesn't apply as-is to Volla, I actually don't know if that one has a Low Memory Killer activated.
In principle each device maintainer needs to make sure that low-memory situations are dealt with properly, one way or another. We currently don't have a unified approach to that.
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@fredldotme Ok. Thank you very much for clarifying this. I am experiencing on the Volla, as already mentioned, problems in multi-tasking. All I can do is to point your remark to the different issues where I mentioned the problem. The rest is out of my knowledge/competence.
Opened/probably concerned issues are :
https://github.com/ubports/morph-browser/issues/495https://github.com/HelloVolla/ubuntu-touch-beta-tests/issues/101
if you want to put some of your useful comments inside. -
@fredldotme @StandUpMobile @domubpkm
For two days I have been testing this fix on RC and I couldn´t be happier. The daily lockups have gone and the OnePlus 3T is as snappy and smooth like when UT was first installed. Multitasking isn´t a problem either. Only had one freeze, I guess it was just me pushing the device to the limit.
Thanks a ton especially to @fredldotme for making me appreciate my device running UT again as it's supposed to.
