Re: [RFC] kbuild: bpf: Do not run pahole with -j on 32bit userspace

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On Mon, Aug 26, 2024 at 08:42:10PM +0200 Sedat Dilek wrote:
> On Mon, Aug 26, 2024 at 7:03 PM Arnaldo Carvalho de Melo
> <acme@xxxxxxxxxx> wrote:
> >
> > On Mon, Aug 26, 2024 at 10:57:22AM +0200, Jiri Slaby wrote:
> > > On 22. 08. 24, 17:24, Arnaldo Carvalho de Melo wrote:
> > > > On Thu, Aug 22, 2024 at 11:55:05AM +0800, Shung-Hsi Yu wrote:
> > > > I stumbled on this limitation as well when trying to build the kernel on
> > > > a Libre Computer rk3399-pc board with only 4GiB of RAM, there I just
> > > > created a swapfile and it managed to proceed, a bit slowly, but worked
> > > > as well.
> > >
> > > Here, it hits the VM space limit (3 G).
> >
> > right, in my case it was on a 64-bit system, so just not enough memory,
> > not address space.
> >
> > > > Please let me know if what is in the 'next' branch of:
> >
> > > > https://git.kernel.org/pub/scm/devel/pahole/pahole.git
> >
> > > > Works for you, that will be extra motivation to move it to the master
> > > > branch and cut 1.28.
> >
> > > on 64bit (-j1):
> > > * master: 3.706 GB
> > > (* master + my changes: 3.559 GB)
> > > * next: 3.157 GB
> >
> > > on 32bit:
> > >  * master-j1: 2.445 GB
> > >  * master-j16: 2.608 GB
> > >  * master-j32: 2.811 GB
> > >  * next-j1: 2.256 GB
> > >  * next-j16: 2.401 GB
> > >  * next-j32: 2.613 GB
> > >
> > > It's definitely better. So I think it could work now, if the thread count
> > > was limited to 1 on 32bit. As building with -j10, -j20 randomly fails on
> > > random machines (32bit processes only of course). Unlike -j1.
> >
> > Cool, I just merged a patch from Alan Maguire that should help with the
> > parallel case, would be able to test it? It is in the 'next' branch:
> >
> > ⬢[acme@toolbox pahole]$ git log --oneline -5
> > f37212d1611673a2 (HEAD -> master) pahole: Teduce memory usage by smarter deleting of CUs
> >
> 
> *R*edzce? memory usage ...
>

If you meant that further typo it's golden, and if not the irony is rich :)

Either way this is my favorite email of the day!


Cheers,
Phil


> -Sedat-
> 
> > Excerpt of the above:
> >
> >     This leads to deleting ~90 CUs during parallel vmlinux BTF generation
> >     versus deleting just 1 prior to this change.
> >
> > c7ec9200caa7d485 btf_encoder: Add "distilled_base" BTF feature to split BTF generation
> > bc4e6a9adfc72758 pahole: Sync with libbpf-1.5
> > 5e3ed3ec2947c69f pahole: Do --lang_exclude CU filtering earlier
> > c46455bb0379fa38 dwarf_loader: Allow filtering CUs early in loading
> > ⬢[acme@toolbox pahole]$
> >
> > - Arnaldo
> >
> 

-- 





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