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2015-09-01core: unified cgroup hierarchy supportLennart Poettering
This patch set adds full support the new unified cgroup hierarchy logic of modern kernels. A new kernel command line option "systemd.unified_cgroup_hierarchy=1" is added. If specified the unified hierarchy is mounted to /sys/fs/cgroup instead of a tmpfs. No further hierarchies are mounted. The kernel command line option defaults to off. We can turn it on by default as soon as the kernel's APIs regarding this are stabilized (but even then downstream distros might want to turn this off, as this will break any tools that access cgroupfs directly). It is possibly to choose for each boot individually whether the unified or the legacy hierarchy is used. nspawn will by default provide the legacy hierarchy to containers if the host is using it, and the unified otherwise. However it is possible to run containers with the unified hierarchy on a legacy host and vice versa, by setting the $UNIFIED_CGROUP_HIERARCHY environment variable for nspawn to 1 or 0, respectively. The unified hierarchy provides reliable cgroup empty notifications for the first time, via inotify. To make use of this we maintain one manager-wide inotify fd, and each cgroup to it. This patch also removes cg_delete() which is unused now. On kernel 4.2 only the "memory" controller is compatible with the unified hierarchy, hence that's the only controller systemd exposes when booted in unified heirarchy mode. This introduces a new enum for enumerating supported controllers, plus a related enum for the mask bits mapping to it. The core is changed to make use of this everywhere. This moves PID 1 into a new "init.scope" implicit scope unit in the root slice. This is necessary since on the unified hierarchy cgroups may either contain subgroups or processes but not both. PID 1 hence has to move out of the root cgroup (strictly speaking the root cgroup is the only one where processes and subgroups are still allowed, but in order to support containers nicey, we move PID 1 into the new scope in all cases.) This new unit is also used on legacy hierarchy setups. It's actually pretty useful on all systems, as it can then be used to filter journal messages coming from PID 1, and so on. The root slice ("-.slice") is now implicitly created and started (and does not require a unit file on disk anymore), since that's where "init.scope" is located and the slice needs to be started before the scope can. To check whether we are in unified or legacy hierarchy mode we use statfs() on /sys/fs/cgroup. If the .f_type field reports tmpfs we are in legacy mode, if it reports cgroupfs we are in unified mode. This patch set carefuly makes sure that cgls and cgtop continue to work as desired. When invoking nspawn as a service it will implicitly create two subcgroups in the cgroup it is using, one to move the nspawn process into, the other to move the actual container processes into. This is done because of the requirement that cgroups may either contain processes or other subgroups.
2015-09-01cgtop: properly show "/" instead of empty string in cgroup listLennart Poettering
2015-08-31cgtop: rework error handlingLennart Poettering
Never report errors twice.
2015-08-31cgtop: allow toggling of --recursive= and -k at runtimeLennart Poettering
2015-08-31cgtop: recursively count cgroup member tasksLennart Poettering
When showing the number of tasks in a cgroup, recursively count tasks in child cgroups and include them in the number. This ensures that the number of tasks is cummulative the same way as memory, cpu and IO resources are. Old behaviour can be restored by passing the new --recursive=no switch.
2015-08-31cgtop: ignore kernel threads when counting tasksLennart Poettering
However, allow them to be counted in by specifying -k
2015-08-31cgtop: show resource usage relative to cgroup root onlyLennart Poettering
This way the output is restricted to cgroups from a container when run in one.
2015-08-28cgtop: major modernizationsLennart Poettering
In preparation of the unified cgroup support, let's clean up cgtop: a) rework time code to be based on "nsec_t" rather than "struct timespec" b) Introduce long option --order= for selecting ordering c) count number of processes only in the main hierarchy, don't bother with the controller hierarchies. We don't allow orthogonal hierarchies in systemd anymore, hence there's no point to check the other hierarchies. d) Deal with non-monotonic cpuacct values (see #749) e) When sorting groups, don't do prefix compare when ordering by number of tasks, since this is not accumulative for all children. f) Actually make --cpu without parameter work g) Don't output control characters when we get them as input. Fixes #749.
2015-07-17cgtop: include missing signal.h for sigwinchUmut Tezduyar Lindskog
2015-06-10cgtop: IO readings are valid if any data is available, even if unchanged ↵Charles Duffy
since last tick Emit "0" rather than "-" if no change in IO values are seen for a process since last tick, so long as accounting has registered content at all.
2015-06-09cgtop: more sensible flushing behavior w/ non-TTY outputCharles Duffy
- Explicitly flush stdout before sleep between iterations - Only clear user keystrokes when output is to TTY - Add a newline between output batches when output is not to TTY
2015-06-09cgtop: allow user to force looping behavior even in non-TTY modeCharles Duffy
2015-06-09cgtop: raw output option (disable conversion to human-readable units)Charles Duffy
2015-04-11shared: add terminal-util.[ch]Ronny Chevalier
2015-03-11cgtop: fix assert when not on ttyUmut Tezduyar Lindskog
systemd-cgtop --dept=1 -b -n 10 -d 0.1 | cat Assertion 'new_length >= 3' failed at src/shared/util.c:3 \ 595, function ellipsize_mem(). Aborting. Aborted (core dumped) (David: add comment)
2014-11-28treewide: no need to negate errno for log_*_errno()Michal Schmidt
It corrrectly handles both positive and negative errno values.
2014-11-28treewide: auto-convert the simple cases to log_*_errno()Michal Schmidt
As a followup to 086891e5c1 "log: add an "error" parameter to all low-level logging calls and intrdouce log_error_errno() as log calls that take error numbers", use sed to convert the simple cases to use the new macros: find . -name '*.[ch]' | xargs sed -r -i -e \ 's/log_(debug|info|notice|warning|error|emergency)\("(.*)%s"(.*), strerror\(-([a-zA-Z_]+)\)\);/log_\1_errno(-\4, "\2%m"\3);/' Multi-line log_*() invocations are not covered. And we also should add log_unit_*_errno().
2014-10-23install, cgtop: adjust hashmap_move_one() callers for -ENOMEM possibilityMichal Schmidt
That hashmap_move_one() currently cannot fail with -ENOMEM is an implementation detail, which is not possible to guarantee in general. Hashmap implementations based on anything else than chaining of individual entries may have to allocate. hashmap_move_one will not fail with -ENOMEM if a proper reservation has been made beforehand. Use reservations in install.c. In cgtop.c simply propagate the error instead of asserting.
2014-09-15hashmap: introduce hash_ops to make struct Hashmap smallerMichal Schmidt
It is redundant to store 'hash' and 'compare' function pointers in struct Hashmap separately. The functions always comprise a pair. Store a single pointer to struct hash_ops instead. systemd keeps hundreds of hashmaps, so this saves a little bit of memory.
2014-08-03Unify parse_argv styleZbigniew Jędrzejewski-Szmek
getopt is usually good at printing out a nice error message when commandline options are invalid. It distinguishes between an unknown option and a known option with a missing arg. It is better to let it do its job and not use opterr=0 unless we actually want to suppress messages. So remove opterr=0 in the few places where it wasn't really useful. When an error in options is encountered, we should not print a lengthy help() and overwhelm the user, when we know precisely what is wrong with the commandline. In addition, since help() prints to stdout, it should not be used except when requested with -h or --help. Also, simplify things here and there.
2014-02-19make gcc shut upLennart Poettering
If -flto is used then gcc will generate a lot more warnings than before, among them a number of use-without-initialization warnings. Most of them without are false positives, but let's make them go away, because it doesn't really matter.
2013-12-25build-sys: minor fixes found with cppcheckLennart Poettering
2013-11-06clients: unify how we invoke getopt_long()Lennart Poettering
Among other things this makes sure we always expose a --version command and show it in the help texts.
2013-10-13Never call qsort on potentially NULL arraysZbigniew Jędrzejewski-Szmek
This extends 62678ded 'efi: never call qsort on potentially NULL arrays' to all other places where qsort is used and it is not obvious that the count is non-zero.
2013-09-04cgtop: fixup the online helpBrandon Philips
The online help shows the keys as uppercase but the code and manpage say lower case. Make the online help follow reality.
2013-06-06cgroup: the "tasks" attribute is obsolete, cgroup.procs is the new replacementLennart Poettering
2013-04-08cgtop: print absolute CPU times with format_timespanLennart Poettering
2013-04-04util: make time formatting a bit smarterLennart Poettering
Instead of outputting "5h 55s 50ms 3us" we'll now output "5h 55.050003s". Also, while outputting the accuracy is configurable. Basically we now try use "dot notation" for all time values > 1min. For >= 1s we use 's' as unit, otherwise for >= 1ms we use 'ms' as unit, and finally 'us'. This should give reasonably values in most cases.
2013-04-03util: rename parse_usec() to parse_sec() sinds the default unit is secondsLennart Poettering
Internally we store all time values in usec_t, however parse_usec() actually was used mostly to parse values in seconds (unless explicit units were specified to define a different unit). Hence, be clear about this and name the function about what we pass into it, not what we get out of it.
2013-04-02cgtop: add % as key to toggle time/percentageZbigniew Jędrzejewski-Szmek
2013-04-02cgtop: optionally show CPU usage as time and become stdout sensitiveUmut Tezduyar
2013-03-29cgtop --help: default depth is 3 not 2Maksim Melnikau
use default depth from variable for --help
2013-02-14honor SELinux labels, when creating and writing config filesHarald Hoyer
Also split out some fileio functions to fileio.c and provide a SELinux aware pendant in fileio-label.c see https://bugzilla.redhat.com/show_bug.cgi?id=881577
2012-10-19util: unify line caching and column cachingLennart Poettering
2012-10-19util: simplify column caching logicLennart Poettering
2012-09-21cgtop: missing '-'Václav Pavlín
Return codes in systemd are negated and if (r < 0) if (r == ENOENT) was never true.
2012-08-06continue work with error messages, log_oom()Shawn Landden
Adds messages for formally silent errors: new "Failed on cmdline argument %s: %s". Removes some specific error messages for -ENOMEM in mount-setup.c. A few specific ones have been left in other binaries.
2012-07-26cgtop: add --version optionZbigniew Jędrzejewski-Szmek
2012-07-26cgtop: use full terminal widthZbigniew Jędrzejewski-Szmek
2012-07-26Add a 'b' option to cgtop, equivalent to the same option in topDavid Strauss
[zj: use static]
2012-07-26Add an 'n' option to cgtop (equivalent to top)David Strauss
2012-07-26log.h: new log_oom() -> int -ENOMEM, use itShawn Landden
also a number of minor fixups and bug fixes: spelling, oom errors that didn't print errors, not properly forwarding error codes, few more consistency issues, et cetera
2012-07-25use "Out of memory." consistantly (or with "\n")Shawn Landden
glibc/glib both use "out of memory" consistantly so maybe we should consider that instead of this. Eliminates one string out of a number of binaries. Also fixes extra newline in udev/scsi_id
2012-07-13util: rename join() to strjoin()Lennart Poettering
This is to match strappend() and the other string related functions.
2012-05-29cgtop: work even if not all cgroups are availableShawn Landden
cgtop quits on startup if all the cgroup mounts it expects are not available. Just continue without nonexistant ones.
2012-05-22cgtop: change default depth to 3Lennart Poettering
https://bugs.freedesktop.org/show_bug.cgi?id=49778
2012-05-08util: split-out path-util.[ch]Kay Sievers
2012-04-13build-sys: add stub makefiles to all subdirs to ease development with emacsLennart Poettering
2012-04-12move all tools to subdirsKay Sievers