My DAMON talk proposal for Kernel Summit track of Linux Plumbers Conference 2023 has accepted. We did DAMON talk every year at Kernel Summit since 2019, so this is the fifth Kernel Summit DAMON talk. Happy to have yet another chance. I hope it to be a place to discuss about future DAMON development works with core kernel developers.

https://lpc.events/event/17/contributions/1624/

#linux #kernel #damon #kernelsummit #linuxplumbers

@hyeyoo I miss the past that logcat live wallpaper[1] was showing whole system log

[1] https://play.google.com/store/apps/details?id=org.jraf.android.logcatlivewallpaper&hl=en_US&gl=US

@hyeyoo Thank you, you too!

@gregkh @KernelRecipes I was able to get the video by rewinding the livestream: https://www.youtube.com/live/xDHTn0auo2w?si=NXDpMbtEwDJyLZLD&t=14940

@mxk I indeed had grateful chances to earn very cool socks, but I wear only ankle socks 😎

@ljs I understand the feeling. Maybe I should make some sponsor t-shirts for LSF/MM that have DAMON logo together ;) Hmm, for that, should I make a foundation for DAMON? Wait, then would I need to design the logo first? 🖌

Grateful swags that I got from #osseu

#ossummit #ossummit_eu #osseu #spain #bilboa

@corbet @sjvn Send the emails my way, no one seems to ever actually want to talk to _me_ about these support dates for some odd reason...

So OSS Europe was an interesting experience, this year, in a way.

I did my usual talk, and started with the usual section on kernel releases. When talking about stable updates I tossed in a quick mention that six-year support from the stable team was being phased out — something I understood to be generally known for about the last year. Way at the end of the talk, as my last topic, I discussed at some length the stresses being felt by kernel maintainers.

@sjvn wrote an article about the talk (https://www.zdnet.com/article/long-term-support-for-linux-kernel-to-be-cut-as-maintainence-remains-under-strain/) and made a connection between the stable-policy change and the maintainer issue — something I had not done in the talk. It was a bit of a shift from what I said, but not a bad article overall.

Then the rest of the net filled up with other writers putting up articles that were clearly just cribbed from SJVN's piece — sometimes with credit, sometimes without. I'm getting emails about what a terrible idea this all is, as if I had anything to do with that decision or can somehow change it. I have, it seems, taken away everybody's six-year support, and they're not happy about it.

All because of a 30-second mention of a change that was made public something like a year ago. My 1.5 minutes of fame has given me a new appreciation for this old quote from Rusty Russell: "when a respected information source covers something where you have on-the-ground experience, the result is often to make you wonder how much fecal matter you've swallowed in areas outside your own expertise."

My OSSummit EU DAMO talk[1] video is available at https://www.youtube.com/live/ggx9ZssPHU8?si=fP3dinUeJ8pB4KMr&t=16329

The slides are also uploaded to the talk intro page[1] and GitHub[2].

[1] https://sched.co/1OGf9
[2] https://github.com/damonitor/talks/blob/master/2023/ossummit_eu/damo_ossummit_eu_2023.pdf

#linux #kernel #damon #damo #ossummit #ossummit_eu #osseu

@ljs Agreed. I hope fully self driving (a.k.a self-tuning) DAMON be available before that :)

@ljs I'd rather walk until real fully self driving cars be available ;)

@vbabka Thank you! It's a pity that you don't attend OSS, but no problem. I know we will meet in another venue :)

@hyeyoo Trains frequently being delayed. Walking is more predictable ;)

My talk at OSSummit EU[1], which will be held next week in Spain, has accepted.  I therefore arrived in Spain early and walked the pilgrim's road[2], from Burgos to Santiago de Compostella.  After 26 days, I arrived at Santiago de Compostella yesterday.  It was about a 500 km journey.

It is of course the road of pilgrimage, but it was also a journey of DAMON[3] hacking.  I walked in the morning, took a rest and slept in the afternoon and the evening, and then hacked DAMON from midnight until morning everyday.  I had a great time to walk, show, feel, meet, think, and code.

I made a few new friends.  I also made DAMON patches[4,5,6,7,8] that I was working for the last two months without sufficient progress done in time and merged those into the mm tree.  I believe now I can move forward to the next important DAMON feature development.  I also made the first draft of DAMO's new usage document[9], which I was struggling since the DAMO v1.0.0 release.  Hopefully it will cover more DAMON use cases in a stable and convenient way.  What a grateful progress.

The journey is not finished yet, though.  My final destination of this journey is OSSummit EU.  Looking forward to meeting people and sharing some more about DAMON (the talk will be focused on DAMO, though)!


#ossummit #ossummiteu #linux #kernel #damon #damos #spain #pilgrimage #caminodesantiago​


[1] https://sched.co/1OGf9​
[2] https://en.wikipedia.org/wiki/Camino_de_Santiago​
[3] https://damonitor.github.io​
[4] https://lore.kernel.org/damon/20230907022929.91361-1-sj@kernel.org/​
[5] https://lore.kernel.org/damon/20230913022050.2109-1-sj@kernel.org/​
[6] https://lore.kernel.org/damon/20230914021523.60649-1-sj@kernel.org/​
[7] https://lore.kernel.org/damon/20230915025251.72816-9-sj@kernel.org/​
[8] https://lore.kernel.org/damon/20230916020945.47296-1-sj@kernel.org/​
[9] https://github.com/awslabs/damo/commit/615b595e14fc32763c8b34f96d88290ccbd277fc​

damo[1] (DAMON userspace tool)'s GitHub stats at the moment show nice numbers. 111 stars, 10 watching, 20 forks. :)

[1] https://github.com/awslabs/damo

#linux #kernel #damon #damo

Yet another academic paper preprint[1] regarding serverless on CXL using/citing DAMON has uploaded: "Understanding and Optimizing Serverless Workloads in CXL-Enabled Tiered Memory"

[1] https://arxiv.org/pdf/2309.01736.pdf

#linux #kernel #damon

Here is a hopefully-useful notice about Linux kernel security issues, as it seems like this knowledge isn't distributed very widely based on the number of emails I get on a weekly basis:

- The kernel security team does not have any "early notice"
announcement list for security fixes for anyone, as that would only
make things more insecure for everyone.

- The kernel community does not assign CVEs, nor do we deal with them
at all. This is documented in the kernel's security policy, yet we
still have a number of people asking for CVE numbers even after
reading that policy. See my longer "CVEs are dead..." talk for full
details about how the CVE process is broken for projects like Linux:
https://kernel-recipes.org/en/2019/talks/cves-are-dead-long-live-the-cve/

- You HAVE to take all of the stable/LTS releases in order to have a
secure and stable system. If you attempt to cherry-pick random
patches you will NOT fix all of the known, and unknown, problems,
but rather you will end up with a potentially more insecure system,
and one that contains known bugs. Reliance on an "enterprise"
distribution to provide this for your systems is up to you, discuss
it with them as to how they achieve this result as this is what you
are paying for. If you aren't paying for it, just use Debian, they
know what they are doing and track the stable kernels and have a
larger installed base than any other Linux distro. For embedded,
use Yocto, they track the stable releases, or keep your own
buildroot-based system up to date with the new releases.

- Test all stable/LTS releases on your workload and hardware before
putting the kernel into "production" as everyone runs a different %
of the kernel source code from everyone else (servers run about
1.5mil lines of code, embedded runs about 3.5mil lines of code, your
mileage will vary). If you can't test releases before moving them
into production, you might want to solve that problem first.

- A fix for a known bug is better than the potential of a fix causing a
future problem as future problems, when found, will be fixed then.

I think I need to give another talk about this issue to go into the above in more detail. So much for me giving a technical talk at Kernel Recipes this year...

As mentioned[1] to Lorenzo Stoakes, I'd like to buy a glass of beer to people who gave the first hundred stars to damo[2]. If you are in the first hundred group and find me from any offline venue, please let me know you're one of the group so that I can buy you a glass of beer :) I will attend the Open Source Summit Europe[3] and hopefully Linux Plumbers[4] for the rest of this year :)

[1] https://shorturl.at/szZ45
[2] https://github.com/awslabs/damo
[3] https://events.linuxfoundation.org/open-source-summit-europe/
[4] https://lpc.events/event/17/

#linux #kernel #damon #damo