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.
/Jarkko
