[Kernel-meetup] Pune kernel meetup for February - meeting minutes

[Pankaj Gupta]

> Hello,
> It was a very interesting meetup, I would recommend some topics that I find
> interesting ( which others might not :P) :

> 1. Code walk of xfs
> 2. Vulkan APIs
> 3. VFIO hardware pass-through of pci devices

I can help with this. 

> 4. Some small project that we all could work on, on personal level and share
> knowledge.

Sure! 

> PS. I'm not good at any of these topics, but I want to learn more. I tried
> passing the control of my gpu to Vm, but I only have one gpu.

you interested in passing your gpu to guest ? which company gpu is it? 
I have in general idea about vfio and device pass-through. Recently I tried DPDK NIC's 
with that and measured Network performance. I haven't tried the gpu yet. But would be interesting 
to try and see. 

Thanks, 
Pankaj 

> Thank you,
> Achilles Gaikwad

> On 27-Feb-2017 10:11 PM, "Pankaj Gupta" < pagupta at redhat.com > wrote:

> > Hello,
> 

> > Thanks everyone for attending this meet-up in Red Hat premises Pune.
> 

> > Below is summary of meetup:
> 

> > * Approximately >20 guys attended the meet-up. Overall there was diverse
> 
> > crowd comprised of people from different companies/institutes. Some were
> 
> > experienced in kernel and related areas, want to learn more and contribute.
> 
> > Also, there were few students who were genuinely interested in the topic.
> 

> > I later realized python meetup happening in parallel, thanks to that as
> > well.
> 

> > * First session was: "Submitting first patch upstream" by Jeetendra. It was
> 
> > a nice interactive session with an example of how to send your first patch.
> 

> > Started with version control system and benefits concentrating on git.
> 
> > Jeetendra demonstrated use of " checkpatch.pl ", " get_maintainer.pl " with
> > some 'git' concepts
> 
> > like create new branch for every new work and commit individual changes to
> > new patch in
> 
> > that branch.
> 

> > He created a patch and compiled kernel after fixing a 'trivial style
> > issue'.
> 
> > He used 'git format-patch' to create patch from local commit and sent patch
> 
> > using 'git-sent-mail' to staging mailing list.
> 
> > Some discussion about git trees like staging, stable, linus and distro etc.
> 
> > He also pointed to kernel documentation for all the steps. Attendees asked
> > some doubts.
> 

> > Siddhesh added with some benefits of git version control and more tips.
> 

> > * Next we had 10 minutes meetup/Networking till next session starts. Also,
> > small
> 
> > refreshment (Thanks to Red Hat )
> 

> > * After that I presented session on "Overview of Linux Memory Management"
> 
> > I tried to explain, why we we need 'virtual memory' and how linux supports
> 
> > it with the help of 'paging'. Idea was to start with basics. Also explained
> > some
> 
> > of the internals with MMU, TLB & page tables. Memory allocation using
> > kmalloc
> > & vmalloc.
> 
> > Also, gave a small overview of MM concepts out of scope pf this session.
> 
> > Attendees asked good questions...
> 
> > - One question I got 'algo of buddy allocator'
> 
> > - Zone vs Node relation. how zone manage pages?
> 
> > - TLB flush for PTE update? entire TLB flush or just one entry
> 
> > - kmalloc/vmalloc discussion
> 
> > - What is high memory?
> 
> > - Someone asked about OOM killer and its decision criteria?
> 

> > Jeetendra asked me to can we do code walk through of any small part in
> > coming
> > meetups
> 
> > and I noted.
> 

> > * Siddhesh, 'Amit Kucheria' and me(Pankaj) requested attendees to join
> > mailing list. Everyone
> 
> > agreed to do regular meetup on last weekend of every month. Amit asked
> > people
> > to come
> 
> > up with the ideas on topic of interests. As anyone can be interested in new
> > topics as well.
> 
> > So, different topics can be learning opportunity for everyone.
> 

> > - 'Nitin Bansal' agreed to present session on 'crash' debugging with
> > example.
> 
> > - 'Jeetendra will give "session on ext filesystem in general"
> 
> > - Amit asked me(Pankaj), can we include pending 'Networking session with
> > QEMU/KVM' which I noted.
> 
> > As initially we are planning to have two sessions on every meetup, we will
> > have to see
> 
> > if we can plan this for future meetups.
> 

> > This is all the talk we had in the meetup. I really enjoyed attending it
> > and
> > enthusiasm of attendees
> 
> > was awesome. I hope we will have more meetups in future and sessions to
> > learn
> > and share knowledge.
> 

> > Thank you Guys!
> 

> > Feel free to add if I missed any thing.
> 

> > -----------------
> 

> > Some of the my topics of interests are for future meet-ups on which i want
> > to
> > talk are:
> 

> > * "Code walk through of any one topic of MM". Also I am interested to
> > discuss
> > about kVM MM internals.
> 
> > * "Code walk through of any one topic of RT Kernel" or in general.
> 
> > * "Overview of some of the kernel synchronization techniques or code
> > overview
> > of atleast one :-)"
> 

> > Please share your thoughts or interested topics as well.
> 

> > Best regards,
> 
> > Pankaj
> 

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