| === cpaelzer__ is now known as cpaelzer | ||
| === kubkdee is now known as kubkde | ||
| FurretUber | Hi, I found a memory leak on i915 on the kernel 5.0.0-7 and 5.0.0-8 from Disco Dingo. It seems similar to another i915 leak where it leaks when Vulkan applications are used | 14:02 |
|---|---|---|
| tjaalton | FurretUber: please file it upstream | 14:03 |
| tjaalton | so we'll get a fix via the stable branch, maybe | 14:03 |
| kubkde | hey there fellers. i'm interested in rebuilding my kernel to include f2fs modules. is this the correct channel or should i be using a support channel instead? | 14:05 |
| kubkde | i should be cloning the git repo from kernel.ubuntu.com, correct? I've seen others use apt to pull | 14:20 |
| kubkde | So do I really have to download the whole thing? | 14:34 |
| kubkde | I didn't expect to download 800+ MB to add a couple modules lol | 14:35 |
| === kubkdee is now known as kubkde | ||
| stgraber | https://bugs.launchpad.net/ubuntu/+source/linux-meta-lts-xenial/+bug/1820526 is a bit of a problem | 16:31 |
| ubot5 | Ubuntu bug 1820526 in linux-meta-lts-xenial (Ubuntu) "linux-signed-generic-lts-xenial 4.4.0-143 depends on linux-generic instead of linux-generic-lts-xenial" [Critical,Confirmed] | 16:31 |
| === SimonNL is now known as SimonNL_Afk | ||
| arighi | /q tru | 16:51 |
| klebers | apw, ^ our linux-meta-lts-xenial is producing a linux-signed-generic-lts-xenial that depends on linux-generic instead of linux-generic-lts-xenial | 16:51 |
| === SimonNL_Afk is now known as SimonNL | ||
| kubkde | How can I load f2fs modules into a kernel to compile? | 19:03 |
| chiluk | @apw @cking ... Here's my last few months of work rolled up into an e-mail. https://lkml.org/lkml/2019/3/18/706 | 19:03 |
| kubkde | And in a broader sense, is the page linked in the topic up to date? | 19:04 |
| chiluk | afaik I've seen 512ac99 accepted on some of the linux-stable trees. I'm not sure who's doing stable maintenance any more, but you might want to watch out on this one. | 19:04 |
| cking | chiluk, this is excellent analysis; thanks for the heads up on this | 19:05 |
| cking | ..be interesting to see what upstream says about it | 19:05 |
| chiluk | Yeah I figured you guys might want a heads up... | 19:06 |
| chiluk | especially with the stable submissions... and performance is hard kind of issues. | 19:06 |
| kubkde | is https://wiki.ubuntu.com/Kernel/ well rounded enough to learn from? | 19:07 |
| chiluk | You can definitely learn from it. | 19:07 |
| chiluk | what are you trying to accomplish kubkde? | 19:08 |
| chiluk | you might want to try with the Documentation directory in the linux kernel source... | 19:08 |
| kubkde | chiluk, thanks for replying. I want to rebuild a kernel to include f2fs so I don't have to use dracut or initramfs. And also see if what I could accomplish/make 'better' from compiling my own. | 19:10 |
| chiluk | You are unlikely to make much if anything "better" imho.. but you definitely can turn on the flag.. | 19:11 |
| chiluk | and yes that documentation is the best place to go for compiling Ubuntu kernels with the Ubuntu specific patches | 19:11 |
| chiluk | so you don't break anything. | 19:11 |
| kubkde | chiluk, I'll take a look at the documentation direction right now, thanks. Would I be applying the patches after I've done my modifications? Also, what do people generally modify kernels to do? I saw one called 'XanMod' and it looked...the same? | 19:14 |
| kubkde | Christ this is thick. | 19:15 |
| chiluk | People who generally modify kernels are the same who don't know what they are doing... | 19:15 |
| chiluk | in general the only time you should modify kernel sources is if you are fixing something that is broken, and directly fixing c code | 19:16 |
| chiluk | or you need to do something specific like enable a module that is not enabled. | 19:16 |
| kubkde | How long have you been developing? I don't mind the reading but I'm afraid I might end up forgetting to go to work. | 19:16 |
| kubkde | I see | 19:16 |
| chiluk | kubkde.. in your case.. .I just checked and CONFIG_F2FS_FS=m is already set in the 4.15 ubuntu kernels | 19:17 |
| chiluk | you may simply need to modprobe f2fs to get things functioning. | 19:17 |
| kubkde | :O | 19:18 |
| chiluk | really you are unlikely to see any performance differences from building a custom kernel.. | 19:18 |
| chiluk | sometimes even turning on architecture specific optimizations for your specific cpu end up in regressing performance. | 19:18 |
| kubkde | How do you check that? And doing modprobe f2fs doesn't work. I'll try to pull up the specific errors I got in regards to f2fs | 19:18 |
| chiluk | but I'd love to hear how that goes. | 19:19 |
| chiluk | kubkde ... you need to "sudo modprobe f2fs" | 19:19 |
| kubkde | chiluk, that's definitely what I figured. What I plan to do is strip it down to be hardware specific | 19:19 |
| chiluk | that's the thing though. | 19:19 |
| kubkde | Of course...sudo modprobe f2fs. I chrooted into the install after it was done, too | 19:20 |
| chiluk | so much is built as modules now that nothing is loaded that doesn't need to be there. | 19:20 |
| kubkde | Interesting | 19:20 |
| chiluk | the other problem is that so much of the kernel is integer logic that the differences between architectures are almost negligible as all of the fancy architecture specific bits *(aes, simd, sse, etc) don't really apply to the kernel. | 19:23 |
| chiluk | kubkde... good luck though.. I'd love to hear if you make something faster.. You definitely can make the memory footprint smaller. but ram is cheap these days. | 19:25 |
| kubkde | chiluk, I've got so many questions but I don't want to be that pita looking to be spoonfed haha. Reducing memory would be huge for me since my VMs keep eating it all up. | 19:27 |
| kubkde | Of the encyclopedia of that documentation folder, which one do you think would be best to start with? | 19:28 |
| chiluk | you should look at the cloud kernels instead | 19:28 |
| kubkde | cloud kernels? | 19:28 |
| kubkde | woah wtf | 19:28 |
| chiluk | sorry apt install linux-image-virtual | 19:28 |
| chiluk | those are minimal kernels that only support cloud architectures .. | 19:29 |
| chiluk | i.e. xen, kvm, .. not sure if others are supported... maybe vbox.. | 19:29 |
| chiluk | kubkde... did I make your day? | 19:29 |
| kubkde | chiluk, you sure did :p | 19:30 |
| chiluk | kubkde... as for learning kernel internals/adminning I'd start with Documentation/admin-guide... | 19:31 |
| chiluk | if you only care about ubuntu kernels the wiki you linked is probably best. | 19:31 |
| chiluk | but it assumes you know a lot of the stuff in the Documentation folder. | 19:31 |
| kubkde | Thanks, I really appreciate all the info you've given me. I run most VMs locally but even the idea of cloud kernels. Still wtf'ing lol. | 19:31 |
| kubkde | I see, that's somewhat ironic | 19:31 |
| chiluk | 'tsall good ... those are not well publicized.... glad to be of service.. | 19:33 |
| chiluk | kubkde just to be explicit the virtual kernels are supposed to be run in the guests not the host. | 19:35 |
| kubkde | I'm going to stick with Ubuntu so I don't get sidetracked. Ideally once I get good, I'm going to check out cloud kernels since it'd be useful on a resume and for my own media servers lol. | 19:37 |
| kubkde | Sure that makes sense, thanks for the clarification | 19:37 |
| kubkde | It feels like once someone knows how to write a kernel a whole other world of possibility is unlocked | 19:38 |
| kubkde | understands a kernel* rather than how to write one | 19:38 |
| kubkde | Alright....I can't believe you actually read through this chiluk | 19:42 |
| chiluk | kubkde: to be truthful, I only check this once every month or so, and usually it's just to harass my canonical friends about cool stuff I'm working on... so you got REALLY lucky. | 19:43 |
| kubkde | :o | 19:43 |
| kubkde | :O | 19:43 |
| kubkde | holy sh*t lol | 19:43 |
| chiluk | yeah.. | 19:43 |
| kubkde | I didn't even recognize | 19:44 |
| kubkde | Lol | 19:44 |
| chiluk | usually this channel is kind of one of those things where you ask, and then wait a day and see if someone responds. | 19:44 |
| chiluk | usually someone does. | 19:44 |
| kubkde | Then I got really really lucky | 19:44 |
| kubkde | You've got my gratitude chiluk :) | 19:45 |
| chiluk | although if you are just learning ... start with the admin-guide... have fun building a custom kernel.. see if you find any performance improvements... *(I have a feeling you won't)... there's a lot to learn. | 19:45 |
| kubkde | What's the general timeframe I should be expecting to have a full understanding? | 19:46 |
| kubkde | And sorry to bug because I'm sure you're busy, but I couldn't find any documentation on a module named (I think) libcrc32c | 19:50 |
| chiluk | kubkde... never... Linus does not claim to have a full understanding. As for your module, probably start with modinfo libcrc32c .. then you might have to go to the source. | 19:51 |
| chiluk | fortunately modules are usually a pretty good place to start learning kernel programming as they tend to be more self-contained than other parts of the code base... | 19:52 |
| chiluk | another thing to do is actually read a book... I can recommend "linux kernel development" by robert love | 19:52 |
| chiluk | but may expects that you already know a bunch of os fundamentals | 19:53 |
| kubkde | Ah that would be an issue | 19:58 |
| chiluk | cool I'm out kubkde... good luck.. I've done my good dead for the month. | 19:58 |
| kubkde | Turns out I just need to build and install crc32c to run dracut -f --add-drivers f2fs successfully | 19:59 |
| kubkde | And yeah for sure | 19:59 |
| kubkde | Thanks for all the tips! | 19:59 |
| kubkde | Today's my lucky day lol | 19:59 |
| kubkde | Take care chiluk, see you in a month | 20:00 |
| wxl | hey folks. i seem to be having a problem building upstream virtualbox kernel modules in xenial/4.4.0-143 but the bug seems to be related to 4.4.169 and on. this is true in all of the version they have available from 5.0-6.0. and yet the ubuntu version (5.1) works fine. seems related to a api change https://bugzilla.kernel.org/show_bug.cgi?id=202365 but i'm confused as to how being on an older kernel | 20:00 |
| wxl | i'm still having this problem. any insight? | 20:00 |
| ubot5 | bugzilla.kernel.org bug 202365 in Other "broked nvidia and vbox drivers" [Normal,New] | 20:00 |
| chiluk | kubkde dract is a fedora initramfs builder.. you are probably going to want update-initramfs instead .. | 20:07 |
| kubkde | chiluk, right, but the f2fs module either still wasn't loading or something else wasn't working. I tried modprobe f2fs and added it in /etc/initramfs-tools/modules. I do know that all the crc* modules have to be loaded from reading Fedora/Arch forums. Grub's current git (2.03~) has f2fs but it fails make-check. Dracut actually worked once...but once. So the plan is to rebuild a kernel to have all those modules in | 20:13 |
| kubkde | it...although after reading that kernels are mostly full of modules I don't know if compiling my own would be a solution to having f2fs as my root partition | 20:13 |
| kubkde | btw chiluk if you're still around is there anything you think is exciting that's coming up in the new kernels or that could be added? And I know Dracut is for Fedora, but does that mean I'm more than likely to just break more things when I could be using initramfs-tools lol | 20:54 |
| chiluk | ^^ it could break things you are unaware of. | 21:11 |
| FurretUber | Earlier today I found a memory leak on i915 on kernel 5.0. It was asked to report on upstream. I did the bisect but where should I report it? | 22:58 |
| FurretUber | As this is fixed on 5.1-rc1, for FreeDesktop bugzilla it would be considered already fixed | 22:59 |
| tomreyn | FurretUber: https://www.kernel.org/ states that 5.0(.2) is a stable branch, and the latest. i think FDO would still care having it fixed in the 5.0 branch. | 23:51 |
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