On Wed, Oct 07, 2020 at 09:35:06PM +0300, Jarkko Sakkinen wrote:
> On Wed, Oct 07, 2020 at 08:14:48PM +0200, Jethro Beekman wrote:
> > It's this one in do_mmap():
> >
> > /* Too many mappings? */
> > if (mm->map_count > sysctl_max_map_count)
> > return -ENOMEM;
> >
> > I've verified that I'm no longer getting the problem when increasing
> > /proc/sys/vm/max_map_count . Why do I need to change this from the
> > default compared to before?
>
> Yes, you are correct. I came into same conclusion and responded (once
> again) to my own email after running this:
>
> ➜ ~ (master) ✔ sudo bpftrace -e 'kr:ksys_mmap_pgoff { @[comm] = count(); }' &> log.txt
> ^C
> ➜ ~ (master) ✔ cat log.txt
> Attaching 1 probe...
>
>
> @[cat]: 18
> @[git]: 47
> @[zsh]: 49
> @[cargo]: 94
> @[sgx-load-large-]: 65510
>
> That is the default value for /proc/sys/vm/max_map_count.
>
> Re-responding just in case because I thought that the bpftrace snippet
> might have some value for you. I don't why I cannot see my email at
> lore.kernel.org.
... looking also forward to run this test and the test suite (have
not tried yet) in the master branch. This all is really useful for
me that you are doing.
/Jarkko
