Re: upstart: please update to latest upstream version
Peter Samuelson wrote:
> [Josh Triplett]
> > To give one particular example: systemd uses Linux-specific features
> > to accurately track all the processes started by a service, which
> > allows accurate monitoring and shutdown of processes which could
> > otherwise disassociate themselves from their parent processes via the
> > usual daemonizing trick.
>
> This "one particular example" is the same feature (cgroups) that
> everyone keeps talking and talking about. Everyone keeps saying
> "systemd uses Linuxisms like cgroups", but nobody mentions any others.
> Is this the only major Linuxism in systemd, or is it just the only one
> that's interesting enough to talk about?
I just mentioned that particular feature because people already know
about systemd's use of cgroups to track processes, so it wouldn't take
much explanation. Numerous others exist.
https://lwn.net/Articles/453016/ has a partial list:
> cgroups
> namespaces
> selinux
> autofs4
> capabilities
> udev
> oom score adjust
> RLIMIT_RTTIME
> RLIMIT_RTPRIO
> ionice
> SCHED_RESET_ON_FORK
> /proc/$PID/stat
> fanotify
> inotify
> TIOCVHANGUP
> IP_TRANSPORT
> audit
> F_SETPIPE_SZ
> CLONE_xxx
> BTRFS_IOC_DEFRAG
> PR_SET_NAME
> PR_CAPBSET_DROP
> PR_SET_PDEATHSIG
> PR_GET_SECUREBITS
> /proc/$PID/comm
> /proc/$PID/cmdline
> /proc/cmdline
> numerous GNU APIs like asprintf
> SOCK_CLOEXEC, O_CLOEXEC
> /proc/$PID/fd
> /dev/tty0
> TIOCLINUX
> VT_ACTIVATE
> TIOCNXCL
> KDSKBMODE
> /dev/random
> /dev/char/
> openat() and friends
> /proc/$PID/root
> waitid()
> /dev/disk/by-label/
> /dev/disk/by-uuid/
> /sys/class/tty/console/active
> /sys/class/dmi/id
> /proc/$PID/cgroup
> \033[3J
> /dev/rtc
> settimeofday() and its semantics
- Josh Triplett
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