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| 03:51.11 | Mirell | And now to switch my svn checkouts to git.. |
| 04:18.01 | Mirell | Have to tell you, the slab layer is not the most exciting part of the Linux kernel. |
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| 05:17.19 | landley | Mirell what is the most exciting part then? |
| 05:18.30 | Mirell | Timing is interesting, so is the CFS. And how they've had to deal with interrupt handlers and bottom halves. |
| 05:18.51 | Mirell | Oh, so most exciting part is all the concurrency and sync issues, with spinlocks, sleeping processes, semaphores, et cetera. |
| 05:18.57 | Mirell | Slab cache...not so interesting. |
| 05:20.30 | Mirell | And took a break from it to read "Pro Git". Highly recommend. And now to read about some marvelous assembly language and the IA-32 architecture. |
| 05:21.57 | landley | I may want to borrow these books someday... |
| 05:30.24 | Mirell | Pro Git is free online: http://progit.org/book/ |
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| 05:38.18 | Mirell | http://nostarch.com/tlpi looks like it might be useful |
| 05:46.00 | landley | So man pages: the book. |
| 05:46.23 | landley | By the man page maintainer. |
| 05:47.07 | Mirell | Except with many more examples, and more documentation. |
| 05:47.38 | Mirell | My main complaint about many of the man pages for a lot of programs and system calls, is a lot of them fail to include any examples |
| 06:20.47 | Mirell | Hah. I didn't know you could include debugging symbols and step through assembly in gdb. |
| 06:43.45 | landley | mirell: busybox is full of examples. :) |
| 06:44.43 | Mirell | landley: Of? |
| 06:45.09 | Mirell | landley: It's not documentation structured around examples. |
| 06:45.56 | landley | True, but it's good for "how do you do X". |
| 06:47.00 | Mirell | Still, not exactly what I was looking for. |
| 06:59.24 | Mirell | landley: Example of your explanation for that silly Intel instruction? |
| 06:59.58 | landley | what? |
| 07:01.00 | Mirell | landley: F2XM1 |
| 07:01.05 | landley | (2<<x)-1 is how you make an x-bit mask. |
| 07:01.30 | landley | well, 1<<x actually. |
| 07:02.01 | Mirell | Hmm. |
| 07:02.12 | landley | So (1<<4) is 10000 in binary. -1 it becomes 1111 |
| 07:02.16 | Mirell | Since it's 2^X - 1, where X is between -1 and 1 |
| 07:02.50 | landley | So 1-3 bit mask. |
| 07:03.24 | landley | Less useful, but still coming up from time to time. |
| 07:04.08 | landley | If you need bits 3 to 5, make a 3 bit mask then shift it 3 to the left. |
| 07:04.23 | landley | I leave this stuff to the optimizer. |
| 07:04.43 | Mirell | But why would you need a float point value? |
| 07:06.38 | Mirell | landley: That seems like an insanely ineffecient way to compute a bit mask by going to the FPU |
| 07:07.43 | Mirell | landley: http://ftp.wuppy.net.ru/linux/intel/users_guide/mergedProjects/analyzer_ec/mergedProjects/reference_olh/instruct32_hh/vc81.htm |
| 07:09.39 | landley | Could easily be. Maybe they needed it in early 3D stuff or for some formula or benchmark or something. |
| 07:11.52 | Mirell | But in other news, the Intel documentation is amazingly good |
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| 11:36.03 | Mirell | Hah. I didn't realize someone got this domain: http://strncpy.org/ |
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| 15:04.29 | Sphere | [D[C[D[C[D[C[D[C[D[C[Dsdfdf198 |
| 15:08.47 | SpeedEvil | Indeed. |
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| 15:10.17 | Mirell | pets kitty next to keyboard |
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| 16:47.01 | Sphere | that was my shell lagging :p |
| 16:47.27 | Sphere | there was this linux device that was in the shape of an alarm clock and you can browse with it and stuff, anyone know what's the name? |
| 16:48.15 | Sphere | ah chumby |
| 16:48.50 | Mirell | Oh yes. |
| 16:49.01 | Mirell | There was so much hype about it years ago, and it sort of...withered away. |
| 16:49.17 | Sphere | it got a handsolderable ARM9 that can do 500MHz or so, that's why i'm interested |
| 17:47.38 | davidc__ | Mirell / Sphere : they're still selling it; and there are "hacker" boards available on adafruit |
| 17:47.51 | davidc__ | Sphere: its in a BGA package, so not hand-solderable |
| 17:48.41 | Sphere | well the older ones came with an i.MX233 |
| 17:49.01 | Sphere | which is an ARM926 @ max 454MHz in a LQFP128 |
| 17:49.36 | davidc__ | Sphere: I have a preproduction chumby prototype here |
| 17:49.44 | davidc__ | I can rip it open; but I'm pretty sure it was BGA all along |
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| 17:51.54 | Sphere | well the chumby might feature the BGA version |
| 17:57.36 | SpeedEvil | There are some nxp tqfp older processors |
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| 18:29.45 | chouimat | this is a nightmare ... 45C in my office right now |
| 18:35.43 | Sphere | ouch |
| 18:36.30 | chouimat | Sphere: I think I will stop working soon |
| 18:36.48 | Sphere | because you pass out? |
| 18:37.00 | davidc__ | Sphere: that is a sweet part |
| 18:37.10 | davidc__ | now I'm kicking myself for designing a board around the LPC2470 |
| 18:37.23 | davidc__ | I could get the same functionality in the i.MX part with 5 times the processing power |
| 18:37.26 | davidc__ | at the same price |
| 18:37.28 | davidc__ | ah well; thats life |
| 18:37.31 | Sphere | :p |
| 18:37.34 | chouimat | Sphere: yes |
| 18:45.23 | SpeedEvil | At that point, I would be purchasing an environmental vest. |
| 18:45.40 | SpeedEvil | http://www.veskimo.com/servlet/StoreFront |
| 18:45.42 | SpeedEvil | or similar |
| 18:47.55 | chouimat | SpeedEvil: it's not that high it's just it's extremely humid for that last week ... |
| 18:48.04 | chouimat | so it feel like 45 |
| 18:48.54 | SpeedEvil | Ah. |
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| 22:29.36 | Mirell | Huge OSX book is huge: http://yfrog.com/mmtbaj |
| 22:36.56 | Sphere | wonder how big it would be if OS X was open :p |
| 22:39.29 | Mirell | Yes, because the Linux Documentation Project is excellent. |
| 22:39.53 | CosmicPenguin | +1 funny |
| 22:42.58 | Mirell | At least with MacOSX I can generally find stuff written for some vaguely recent version of it on Google. |
| 22:43.11 | Mirell | First result on "linux kernel programming" details the 2.4 kernel. |
| 22:43.43 | Mirell | And the article on ext4 they link to is from 1997: http://www-2.cs.cmu.edu/~mihaib/fs/fs.html |
| 22:44.09 | Mirell | Which is not at all related to the current ext4 |
| 22:47.09 | Mirell | Just sayin. :P |
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