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This should PID collisions a tiny bit less likely, and thus improve
security and robustness.
2^22 isn't particularly a lot either, but it's the current kernel
limitation.
Bumping this limit was suggested by Linus himself:
https://lwn.net/ml/linux-kernel/CAHk-=wiZ40LVjnXSi9iHLE_-ZBsWFGCgdmNiYZUXn1-V5YBg2g@mail.gmail.com/
Let's experiment with this in systemd upstream first. Downstreams and
users can after all still comment this easily.
Besides compat concern the most often heard issue with such high PIDs is
usability, since they are potentially hard to type. I am not entirely sure though
whether 4194304 (as largest new PID) is that much worse to type or to
copy than 65563.
This should also simplify management of per system tasks limits as by
this move the sysctl /proc/sys/kernel/threads-max becomes the primary
knob to control how many processes to have in parallel.
Example output:
title: Fedora 30 (Workstation Edition) (5.0.5-300.fc30.x86_64)
id: 08a5690a2eed47cf92ac0a5d2e3cf6b0-5.0.5-bad-300.fc30.x86_64
source: /boot/efi/loader/entries/08a5690a2eed47cf92ac0a5d2e3cf6b0-5.0.5-bad-300.fc30.x86_64.conf
version: 5.0.5-300.fc30.x86_64
machine-id: 08a5690a2eed47cf92ac0a5d2e3cf6b0
linux: /08a5690a2eed47cf92ac0a/5.0.5-300.fc30.x86_64/linux (No such file or directory)
initrd: /08a5690a2eed47cf92ac0a/5.0.5-300.fc30.x86_64/initrd (No such file or directory)
/08a5690a2eed47cf92ac0a/5.0.5-300.fc30.x86_64/initrd2 (No such file or directory)
options: ...
I think this is more useful (because it's easy to stick the path into an editor command
when one wants to change the options or inspect the files), and more self-explanatory.
Example output:
title: Fedora 30 (Workstation Edition) (4.20.16-200.fc29.x86_64)
id: 08a5690a2eed47cf92ac0a5d2e3cf6b0-4.20.16-200.fc29.x86_64
source: /boot/efi/loader/entries/08a5690a2eed47cf92ac0a5d2e3cf6b0-4.20.16-200.fc29.x86_64.conf
version: 4.20.16-200.fc29.x86_64
...
title: Fedora 30 (Workstation Edition)
id: fedora-30
source: /boot/efi/EFI/Linux/linux-5.0.5-300.fc30.x86_64-08a5690a2eed47cf92ac0a5d2e3cf6b0.efi
linux: EFI/Linux/linux-5.0.5-300.fc30.x86_64-08a5690a2eed47cf92ac0a5d2e3cf6b0.efi
...
title: Reboot Into Firmware Interface
id: auto-reboot-to-firmware-setup
source: /sys/firmware/efi/efivars/LoaderEntries-4a67b082-0a4c-41cf-b6c7-440b29bb8c4f
Nitpicky, but we've used a lot of random spacings and names in the past,
but we're trying to be completely consistent on "cgroup vN" now.
Generated by `fd -0 | xargs -0 -n1 sed -ri --follow-symlinks 's/cgroups? ?v?([0-9])/cgroup v\1/gI'`.
I manually ignored places where it's not appropriate to replace (eg.
"cgroup2" fstype and in src/shared/linux).
Let's simplify things and drop the logic that /var/lib/machines is setup
as auto-growing btrfs loopback file /var/lib/machines.raw.
THis was done in order to make quota available for machine management,
but quite frankly never really worked properly, as we couldn't grow the
file system in sync with its use properly. Moreover philosophically it's
problematic overriding the admin's choice of file system like this.
Let's hence drop this, and simplify things. Deleting code is a good
feeling.
Now that regular file systems provide project quota we could probably
add per-machine quota support based on that, hence the btrfs quota
argument is not that interesting anymore (though btrfs quota is a bit
more powerful as it allows recursive quota, i.e. that the machine pool
gets an overall quota in addition to per-machine quota).
The concept is redundant and predates the special chars that do the same
in ExecStar=. Let's settle on advertising just the latter, and hide
PermissionsStartOnly= from the docs (even if we continue supporting it).
