| === kklimonda1 is now known as kklimonda | ||
| === _LibertyZero is now known as LibertyZero | ||
| fairuz | which process has pid = 0? | 08:40 |
|---|---|---|
| === smb` is now known as smb | ||
| RAOF | itih | 08:40 |
| RAOF | fairuz: init. | 08:40 |
| fairuz | RAOF: ty | 08:41 |
| RAOF | (Which, in Ubuntu, will be upstart) | 08:41 |
| fairuz | RAOF: does this process will run with the kernel? | 08:42 |
| fairuz | RAOF: or just at the beginning | 08:42 |
| RAOF | I'm not sure what you mean? | 08:43 |
| fairuz | RAOF: when I do ps -A, I see that there is no pid 0, init is at pid 1 | 08:43 |
| RAOF | Ah. Then maybe I meant “there is no pid 0, but init is at pid 1” :{ | 08:44 |
| RAOF | Ah. Then maybe I meant “there is no pid 0, but init is at pid 1” :) | 08:44 |
| fairuz | so pid 0 doesnt exist at all? | 08:44 |
| RAOF | Now that I think of it, ‘0’ is probably used as a flag value for pid. | 08:45 |
| Krunch | init is 1 | 08:45 |
| fairuz | yes, I see that init is pid 1 | 08:46 |
| fairuz | i just wondering, since I saw a code that set the affinity of the processor | 08:46 |
| fairuz | and it passes 0 for the pid argument | 08:46 |
| fairuz | And I just wonder which process does have pid 0 | 08:47 |
| Krunch | for syscalls, passing 0 as a pid usually means "myself" | 08:47 |
| fairuz | ah ok | 08:47 |
| fairuz | that make sense | 08:47 |
| Krunch | "If pid is zero, then the calling process is used." -- SCHED_SETAFFINITY(2) | 08:48 |
| fairuz | Krunch: RAOF: ok all make sense now. Thanks | 08:49 |
| fairuz | if we set sched_setaffinity to current process | 08:51 |
| fairuz | that doesnt mean that if we start another process after that, it receive the same affinity? | 08:52 |
| fairuz | it just affects the process that call the setaffinity, right? | 08:52 |
| Krunch | read the friendly manual | 08:54 |
| Krunch | A child created via fork(2) inherits its parent’s CPU affinity mask. | 08:54 |
| fairuz | Krunch: yes i read it. Thanks. But my concern is if I launch a process A to start a hardware counter, then start the process B, and recall process A to stop the counter | 08:56 |
| fairuz | so if I set the affinity in process A, it does not affect process B? | 08:56 |
| fairuz | (process B is not a child of process A), consider its a random test case | 08:57 |
| Krunch | i don't see why it would | 08:57 |
| fairuz | ok | 08:57 |
| Krunch | but just try | 08:57 |
| fairuz | does mmap in user space do the same thing as ioremap in kernel space? | 09:29 |
| === soren_ is now known as soren | ||
| apw | fairuz, nope | 10:09 |
| omry | hi, got a new HP Envy and I am seeing some issues. brighness control keys are not working, touch pad is not wokring correctly and I also not sure turbo boost is working as it should (I see scaling up to 1.73ghz instead of up to 2.93ghz). | 10:10 |
| fairuz | apw: ok. So is there a way to get a virt addr for a known phys addr in user space? | 10:10 |
| omry | I am currently on the stock 10.10 kernel (2.6.35) | 10:11 |
| omry | any recommendations? | 10:11 |
| Krunch | fairuz: i doubt there is an API for that | 10:11 |
| Krunch | fairuz: what you actually trying to do? | 10:12 |
| fairuz | Krunch: just trying to write to a register in userspace | 10:12 |
| fairuz | I want to avoid writing a device driver if possible | 10:12 |
| Krunch | have you looked at ptrace? | 10:13 |
| fairuz | Krunch: I dont think I get what you mean by using ptrace | 10:15 |
| Krunch | the ptrace() system calls allows you to observe and modify processes, there is a flag specifically to change the registers | 10:15 |
| Krunch | or you meant a hardware register or something? | 10:16 |
| Krunch | s/hardware/pci or otherwise not general purpose/ | 10:17 |
| fairuz | yes i mean hardware registers, sorry. | 10:17 |
| Krunch | i doubt you can go and mess the hardware from userland without writing a device driver | 10:18 |
| Krunch | but there are some facilities like libpci | 10:18 |
| fairuz | Krunch: ok. | 10:18 |
| RAOF | You probably can go and mess with (at least PCI, probably more of) the hardware from userspace; X drivers used to be user-space, for example. | 10:19 |
| Krunch | well, in principle you can do pretty much anything you want from userspace by poking around /dev/kmem :) | 10:21 |
| fairuz | do you mean /dev/mem? | 10:21 |
| Krunch | either | 10:21 |
| Krunch | but don't do that | 10:21 |
| fairuz | it's dangerous i assume? | 10:22 |
| Krunch | it's tricky and it will break on every update | 10:22 |
| RAOF | What sort of hardware are you trying to prod, anyway? | 10:22 |
| Krunch | you can see an example of using libpci to change CPU MSR here http://timetobleed.com/enabling-bios-options-on-a-live-server-with-no-rebooting/ | 10:23 |
| Krunch | that's a much saner approach | 10:23 |
| Krunch | and i am confused, the MSR is not changed through libpci | 10:23 |
| Krunch | depend what you are trying to do exactly | 10:24 |
| fairuz | RAOF: it's PL310, a L2 cache controller for ARM | 10:26 |
| RAOF | Funky. No PCI for you! | 10:28 |
| fairuz | RAOF: yes =) | 10:29 |
| RAOF | X did (and still does, I believe) also have userspace I2C drivers, which might be closer to what you're after. | 10:29 |
| fairuz | ok thanks | 10:30 |
| fairuz | If it's too complicated, I'll just write a device driver for that | 10:30 |
| fairuz | easier i guess | 10:30 |
| === ericm_ is now known as ericm | ||
| tgardner | apw, ba04c7c93bbcb48ce880cf75b6e9dffcd79d4c7b | 10:58 |
| === zul_ is now known as zul | ||
| pgraner | tgardner, http://www.linuxpromagazine.com/Online/News/Ubuntu-11.10-Named-Oneiric-Ocelot | 14:25 |
| * smb wished they would get back to attributes he does not need a dictionary for | 14:26 | |
| JFo | I'll be referring to it as 'O' | 14:26 |
| JFo | smb :) | 14:26 |
| smb | Hm, ok something as dreamlike. Could be good or bad. :-P | 14:29 |
| sconklin | http://who-t.blogspot.com/2011/03/how-to-dos-developer.html | 14:29 |
| hallyn | Hi - bug 714335 was supposedly fixed in the -generic but not -server kernel. Is that possible? Or does rebuilding -server and -virtual kernels require a separate trigger? | 14:35 |
| ubot2 | Launchpad bug 714335 in linux "KVM SMP Linux Guests Hang on AMD" [Medium,Confirmed] https://launchpad.net/bugs/714335 | 14:35 |
| smb | hallyn, What makes you think that it should be fixed? IIRC that is one thing I had on my things to review still | 14:38 |
| hallyn | smb: just that the bug submitter said it was fixed :) | 14:38 |
| hallyn | smb: great, thanks I'll leave a comment to the effect that it's awaiting review | 14:39 |
| smb | hallyn, One never knows what exactly was fixed where. Yes, and I try to get back to that next thing today | 14:40 |
| smb | hallyn, I beleieve I started and was wondering about patch #1 which said something about moving a function but the patch looked like adding (probably because of the backport). And before I got to check against the upstream patch I must have been interrupted by something else | 14:42 |
| hallyn | smb: yeah the original commit did the same thing and i didn't want to rock the boat. (it 'moved' a function without removing the original one :) | 14:43 |
| hallyn | smb: thanks. | 14:43 |
| smb | hallyn, Ah ok. :) | 14:43 |
| === ericm is now known as ericm-Zzz | ||
| === diwic is now known as diwic_afk | ||
| === smoser` is now known as smoser | ||
| === ivoks_ is now known as ivoks | ||
| JFo | <-food | 18:11 |
| LLStarks | hi, i was wondering if bug 621265 could get some attention. its had a fix ready for over a month yet still hasn't been backported to maverick. | 18:20 |
| ubot2 | Launchpad bug 621265 in linux "Slow Wireless Connection in Intel 3945abg" [High,Confirmed] https://launchpad.net/bugs/621265 | 18:20 |
| * jjohansen looks | 18:22 | |
| jjohansen | LLStarks: generally fixes like this wait on them moving into the upstream stable tree, of course the .35 tree is a bit different story | 18:24 |
| LLStarks | even usability issues? | 18:27 |
| LLStarks | how do i request an sru? | 18:28 |
| jjohansen | LLStarks: you can send a mail to the kernel team mailing list | 18:31 |
| smoser | smb, around ? | 18:32 |
| kamal | apw: natty 2.6.38-6.33 is FTBFS (due to toolchain breakage?): https://launchpad.net/ubuntu/+source/linux/2.6.38-6.33/+buildjob/2306132 | 19:33 |
| JFo | kamal, likely he is out with pgraner and the new folks since they are doing the 'new guy sprint' | 19:41 |
| kamal | JFo: yup, well apw will surely enjoy knowing that natty kernel is borked when he returns from whatever den of iniquity they're um... "sprinting" at. ;-) | 19:44 |
| genux | lo. was wondering how to compile the new kernel on 11.04 ? what packages do you need, ? I have done apt-get build-dep linux | 19:56 |
| genux | is there anyone here ? | 20:13 |
| LLStarks | yryary | 20:14 |
| genux | what packages are required to compile the present kernel ? just that I am getting errors with .size on assembly.. which could be a funny nasm ? | 20:16 |
| jjohansen | genux: this is natty? | 20:16 |
| genux | yep | 20:16 |
| jjohansen | genux: friday we started noticing build failures, it seems to be a tool update issue | 20:17 |
| kamal | genux: looks like this?: arch/x86/kernel/entry_64.S:1544: Error: .size expression does not evaluate to a constant <--- the toolchain problem | 20:18 |
| genux | arh k. do you have any idea on what tool ? is it because of library's 32bit/64bit ? or is it nasm ? | 20:18 |
| genux | yep | 20:18 |
| jjohansen | atm you can get around this by building in a maverick chroot, but its an issue that will need to be resolved this week | 20:18 |
| jjohansen | genux: I'm not sure yet, I didn't pursue it friday, and haven't looked at it today yet either | 20:19 |
| genux | k.. I wiped off maverick :(. and installed alpha 3. | 20:19 |
| jjohansen | but we do know that it builds fine in a tool chain from about a week ago, and on maverick | 20:19 |
| jjohansen | genux: can you install a chroot env | 20:19 |
| jjohansen | if you have space its easy, using a kernel team script | 20:20 |
| genux | k cool :). shall do that instead :). thanks very much for the help. | 20:20 |
| genux | ask a silly question but where would I get the kernel team script ? | 20:20 |
| jjohansen | genux: just a sec I am looking that one up | 20:20 |
| genux | yeah I have the space.. 120GB for the install | 20:20 |
| genux | jjohansen: thanks :) | 20:20 |
| genux | jjonansen: I would really like to learn more about the kernel process, is there any advice ? I have kernel device drivers book, but would like to re-write the acpi allocation for devices that *believe* the BIOS is saying where something is, but the BIOS has got it wrong. (a problem on my laptop tbh) | 20:23 |
| kamal | genux, jjohansen: https://wiki.ubuntu.com/Kernel/Action/BuildChroot | 20:23 |
| jjohansen | kamal: thanks, I have the worst time finding things since the wiki was reworked | 20:24 |
| kamal | jjohansen: me too ;-) | 20:24 |
| genux | jjohansen: thanks very much | 20:24 |
| jjohansen | genux: as for kernel dev, Linux Device Drivers 3rd edition is a good starting point (its a bit dated, but its free). The new edition of robert loves kernel book is fairly up to date as books go and is good | 20:25 |
| jjohansen | kernel newbies is also a good start | 20:25 |
| jjohansen | for Ubuntu specific stuff | 20:26 |
| jjohansen | https://wiki.ubuntu.com/Kernel/Dev | 20:26 |
| genux | yeah.. I have subscribed to the kernel newbies :). | 20:26 |
| genux | thanks for the book (I have got the 3rd edition :) ) and shall get the other one :) | 20:26 |
| genux | thanks for the ubuntu link. | 20:26 |
| genux | thanks very much for the help | 20:26 |
| jjohansen | unforntunately after a certain point its just diving into the code and trying to figure out what is going on (especially on linux, documentation is somewhat lacking) | 20:27 |
| jjohansen | genux: also the most up to date kernel doc is in the linux kernel it self in the Documentation directory | 20:28 |
| jjohansen | genux: np | 20:28 |
| genux | tbh.. that is something that really interest me.. I have done c/c++/java/.net/php etc etc. and really want to get to learn the internals of the OS :) thanks very much | 20:28 |
| genux | jjohansen: thanks, you have been really helpful :). | 20:29 |
| jjohansen | genux: glad to be of some help | 20:29 |
| genux | jjonansen: btw the wiki link, there is a scripts directory within the chroot-setup, chroot-setup/scripts/build-mkschroot, should that be a ln within the chrootsetup directory ? | 20:33 |
| jjohansen | genux: ?. I am not sure I follow, you can copy the script to your bin dir, or add it to your path element or execute it in place | 20:36 |
| jjohansen | so I would normally do ./chroot-setup/build-mkschroot --arch=i386 maverick maverick-i386 http://archive.ubuntu.com/ubuntu | 20:37 |
| jjohansen | oh and make sure I am in the directory where I want the chroot to be created | 20:37 |
| jjohansen | and then to enter the chroot I use schroot | 20:37 |
| jjohansen | schroot -c maverick-i386 | 20:37 |
| jjohansen | s/i386/amd64/ if you want to do a 64bit environment | 20:38 |
| genux | jjohansen: thanks | 20:38 |
| genux | :) | 20:38 |
| jjohansen | the chroot is nice in that it carries processor personality so that you can have both i386 and am64 chroots on the same machine | 20:38 |
| genux | very cool :) | 20:38 |
| jjohansen | ie. build i386 and amd64 kernels and not have to think about it | 20:38 |
| genux | thanks very much | 20:39 |
| shadeslayer | quick question, can i make the squashfs of a maverick live cd from natty? | 21:27 |
| shadeslayer | i mean will it be compatible> | 21:27 |
| shadeslayer | we have squashfs-tools 4.1 in natty and 4.0 in maverick | 21:28 |
| shadeslayer | ( i'm trying to get a fully updated maverick live CD with backports and updates enabled ) | 21:31 |
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