Posts
3458
Following
207
Followers
343
Linux kernel maintainer. Compilers and virtualization at Parity Technologies.
jarkko
repeated
kernellogger@fosstodon.org

Thorsten Leemhuis (acct. 1/4)

, which allows scheduling policies to be implemented as programs, has been merged for 6.12:

https://git.kernel.org/torvalds/c/88264981f2082248e892a706b2c5004650faac54

See https://lwn.net/Articles/922405/ for a description of what it does and https://lwn.net/Articles/972710/ for the controversy it caused that is the reason why it took so long to land in mainline.

0
5
3
jarkko

Jarkko Sakkinen

"Three Mile Island, the site of worst nuclear disaster in the United States, is reopening and will exclusively sell the power to Microsoft as the company searches for energy sources to fuel its AI ambitions"

https://edition.cnn.com/2024/09/20/energy/three-mile-island-microsoft-ai/index.html

#microsoft #ai
0
1
2
jarkko

Jarkko Sakkinen

I wonder if there is a typst template for label writers such as Dymo LabelWriter 450, which I own. I use gLabels ATM but do not see any point in WYSIWYG and an address label.
0
0
0
jarkko

Jarkko Sakkinen

This performance regression fix is as done as it can be:

https://lore.kernel.org/linux-integrity/20240921120811.1264985-1-jarkko@kernel.org/

As soon as it gets tags I'll put out a pull request. Not having the fixes can double the boot time at least on some AMD desktop CPU's if TPM bus encryption is turned on.

Without fix: 7s -> 20s
WIth the fix: 20s -> 8.7s

So pretty reasonable number, encryption cannot be done without any overhead. Patches fixup unnecessary encryption context throttling.

Hopefully next week when the cons are over there will be some feedback.

#linux #kernel
0
1
1
jarkko

Jarkko Sakkinen

Xenonauts 2 is a nice game, helps with Xcom withdrawal symptoms at least.
0
0
0
jarkko

Jarkko Sakkinen

I got couple of days ago both email that my talk Linux Plumbers was both accepted and also that it was rejected 🤷 I guess there was something wrong with the mailer?

It would be nice to get infos a bit earlier and not in superposition state ;-)

@linuxplumbersconf
1
0
1
jarkko

Jarkko Sakkinen

Julia is pretty cool language IMHO for doing workbook type of stuff like you would with Jupyter and all this "scientific Python" type of stuff. There's excellent support in the REPL cli for persistence with shared environments and projects. I think I replace bc and Python with Julia for being my main calculator app.
1
0
2
jarkko

Jarkko Sakkinen

Edited 2 months ago
I tagged 0.1.0 of my TPM driver test framework: https://codeberg.org/jarkko/linux-tpmdd-test/src/tag/0.1.0

Now it pretty much can take care all testing and development needs I have. From this tag forward the Git history is also declared as stable (i.e. now rewrites).

It's also not that common example of using systemd with BuildRoot ;-)
1
0
1
jarkko

Jarkko Sakkinen

I ended up with:

ftrace {
	event.kprobes {
		tpm_transmit {
			filters = "common_pid < 2"
			probes = "tpm_transmit"
			hist {
				keys = stacktrace
			}
		}
	}
}
kernel {
	trace_buf_size = 1M
	trace_options = sym-addr
}

It gives me counts of stack exercised during the boot. I’d like to get latency calculation but I’m not really good at this so this can do for the time being.

The is held in /sys/kernel/debug/tracing/events/kprobes/tpm_end/hist.

0
0
0
jarkko

Jarkko Sakkinen

Edited 2 months ago
I voted in the Linux Foundation TAB elections.

Since it is politics I can tell that my top three was Dan Williams, Dave Hansen and Kees Cook and for the rest I gave equal vote.
0
0
0
jarkko

Jarkko Sakkinen

Wondering if there is a reason for not having kernel-command line parameter for passing bootconfig. #linux #kernel
1
1
0
jarkko

Jarkko Sakkinen

Noticed by accident in aerc. By pressing 's' you get a vertical pane showing the message instead of having to open it by pressing enter. By pressing 'shift-s' you get a horizontal pane.

#aerc #email
1
0
1
jarkko

Jarkko Sakkinen

Edited 2 months ago
This was good stuff:

https://lwn.net/Articles/990273/
0
0
0
jarkko

Jarkko Sakkinen

My pro tip for Amazon: if successful meetings are so important why not just require people to show up to those F2F?

I think staff would be more motivated with that constraint than enforced in-office weeks 🤷

#amazon #remote #work
0
0
1
jarkko
repeated
mattdm@hachyderm.io

Matthew Miller

Wow! Fedora Linux 41 beta today, _and_ twelve years at Red Hat for me!

2
3
1
jarkko

Jarkko Sakkinen

Edited 2 months ago
After having MacBook Pro for 1.5 years from Tampere University picking the dev laptop for the new job was a no brainer options to pick being Macbook Pro or x86 Linux laptop.

MacOS is pure garbage a development environment. If you get one there is no other ways to make usable except installing Asahi Linux. Working with toolchains sucks, virtualization sucks and conceptually containers do not in reality exist.

I'm not even joking when I say that if i had picked Macbook Pro as my dev laptop for the new job it would statistically show in the performance reports over period of time as a negative impact. It just is super bad operating system for writing code.

I still love my personal Mac mini which is over-expensive audio plugin host :-) It does deliver in that task tho and works well also for watching Netflix.

Phew, it was nice to let all the hate for Macbook Pro out ;-) Piece of shit laptop tbh.
1
0
2
jarkko

Jarkko Sakkinen

I was looking for something that would be a bit like Maple and Matlab for working as calculator, plotting and stuff like that but not as involved as those tools. After trying bunch of options I realized https://julialang.org/ is pretty much size-fit of this niche.
0
0
1
jarkko

Jarkko Sakkinen

I like eBPF because it allows me to set conditions and measurement points so freely. A performance issue that took me some years ago two days to uncover takes now few hours. Improving tools brings so much more productivity than ChatGPT ever could.
0
0
2
jarkko

Jarkko Sakkinen

I think I move my PR for v6.12 to late this week given that the getting performance improvements for TPM encryption are a priority to fix. Would not make sense to postpone them to v6.13 in my opinion.
0
0
0
jarkko

Jarkko Sakkinen

First performance fixes for TPM HMAC encryption:

https://lore.kernel.org/linux-integrity/D4727YOJY8KZ.L6RKMRBKRCSN@kernel.org/T/#m22ed621c65c75c75900fe77c6b963ac98eb1b624

I don't expect this to fully address the performance challenges. It is the first axis here. Other axis is the session creation but these are independent issues.
1
0
2
Show older
About social.kernel.org

Terms of service

  1. Please do not use this service in violation of the Linux Kernel Code of Conduct. Doing so will result in your account suspension with the referral of the matter to the CoC committee.

  2. "Repeating"/"boosting" someone else's status on this platform will be treated as endorsement and will fall under rule #1.

  3. You are encouraged to use this platform to promote your work on the Linux Kernel, but there is no restriction on permitted topics (with the exception of anything covered by #1 above).

  4. There is no requirement to post in English, but it should be considered the primary language of communication on this platform.

Privacy notice

The admins of this service have access to all posted statuses. They aren't looking, but if it's something they shouldn't know about, then you should not post it on this platform.

Please see the Linux Foundation Privacy Policy, which applies to this platform as well.

Getting your own account

If you would like an account on this instance, please check that the following applies to you:

  • You are listed in MAINTAINERS or CREDITS

  • OR: You have a kernel.org account or email address

  • OR: You have a long and established history of involvement with the Linux Kernel

If the above is true and you agree with the Terms of Service and Privacy Notice listed above, please use these instructions to request an account: