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Returns the process command line, if available in the given `process' class,
if not available, falls back to using the comm (short process name) in its
pidstat key.
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Provides a dictionary to access the fields in the
per process /proc/PID/stat files.
One can obtain the available fields by asking for the keys of the
dictionary, e.g.:
>>> p = procfs.pidstat(1)
>>> print p.keys()
['majflt', 'rss', 'cnswap', 'cstime', 'pid', 'session', 'startstack', 'startcode', 'cmajflt', 'blocked', 'exit_signal', 'minflt', 'nswap', 'environ', 'priority', 'state', 'delayacct_blkio_ticks', 'policy', 'rt_priority', 'ppid', 'nice', 'cutime', 'endcode', 'wchan', 'num_threads', 'sigcatch', 'comm', 'stime', 'sigignore', 'tty_nr', 'kstkeip', 'utime', 'tpgid', 'itrealvalue', 'kstkesp', 'rlim', 'signal', 'pgrp', 'flags', 'starttime', 'cminflt', 'vsize', 'processor']
And then access the various process properties using it as a dictionary:
>>> print p['comm']
systemd
>>> print p['priority']
20
>>> print p['state']
S
Please refer to the 'procfs(5)' man page, by using:
$ man 5 procfs
To see information for each of the above fields, it is part of the
'man-pages' RPM package.
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Returns true if this process has a fixed smp affinity mask,
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Returns a list with all the process flags known, details depend
on kernel version, declared in the file include/linux/sched.h in
the kernel sources.
As of v4.2-rc7 these include (from include/linux/sched.h comments):
PF_EXITING Getting shut down
PF_EXITPIDONE Pi exit done on shut down
PF_VCPU I'm a virtual CPU
PF_WQ_WORKER I'm a workqueue worker
PF_FORKNOEXEC Forked but didn't exec
PF_MCE_PROCESS Process policy on mce errors
PF_SUPERPRIV Used super-user privileges
PF_DUMPCORE Dumped core
PF_SIGNALED Killed by a signal
PF_MEMALLOC Allocating memory
PF_NPROC_EXCEEDED Set_user noticed that RLIMIT_NPROC was exceeded
PF_USED_MATH If unset the fpu must be initialized before use
PF_USED_ASYNC Used async_schedule*(), used by module init
PF_NOFREEZE This thread should not be frozen
PF_FROZEN Frozen for system suspend
PF_FSTRANS Inside a filesystem transaction
PF_KSWAPD I am kswapd
PF_MEMALLOC_NOIO Allocating memory without IO involved
PF_LESS_THROTTLE Throttle me less: I clean memory
PF_KTHREAD I am a kernel thread
PF_RANDOMIZE Randomize virtual address space
PF_SWAPWRITE Allowed to write to swap
PF_NO_SETAFFINITY Userland is not allowed to meddle with cpus_allowed
PF_MCE_EARLY Early kill for mce process policy
PF_MUTEX_TESTER Thread belongs to the rt mutex tester
PF_FREEZER_SKIP Freezer should not count it as freezable
PF_SUSPEND_TASK This thread called freeze_processes and
should not be frozen
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Provides a dictionary to access the fields
in the per process /proc/PID/status files.
This provides additional information about processes and threads to
what can be obtained with the procfs.pidstat() class.
One can obtain the available fields by asking for the keys of the
dictionary, e.g.:
>>> import procfs
>>> p = procfs.pidstatus(1)
>>> print p.keys()
['VmExe', 'CapBnd', 'NSpgid', 'Tgid', 'NSpid', 'VmSize', 'VmPMD', 'ShdPnd', 'State', 'Gid', 'nonvoluntary_ctxt_switches', 'SigIgn', 'VmStk', 'VmData', 'SigCgt', 'CapEff', 'VmPTE', 'Groups', 'NStgid', 'Threads', 'PPid', 'VmHWM', 'NSsid', 'VmSwap', 'Name', 'SigBlk', 'Mems_allowed_list', 'VmPeak', 'Ngid', 'VmLck', 'SigQ', 'VmPin', 'Mems_allowed', 'CapPrm', 'Seccomp', 'VmLib', 'Cpus_allowed', 'Uid', 'SigPnd', 'Pid', 'Cpus_allowed_list', 'TracerPid', 'CapInh', 'voluntary_ctxt_switches', 'VmRSS', 'FDSize']
>>> print p["Pid"]
1
>>> print p["Threads"]
1
>>> print p["VmExe"]
1248 kB
>>> print p["Cpus_allowed"]
f
>>> print p["SigQ"]
0/30698
>>> print p["VmPeak"]
320300 kB
>>>
Please refer to the 'procfs(5)' man page, by using:
$ man 5 procfs
To see information for each of the above fields, it is part of the
'man-pages' RPM package.
In the man page there will be references to further documentation, like
referring to the "getrlimit(2)" man page when explaining the "SigQ"
line/field.
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Information about a process with a given pid, provides a dictionary with
two entries, instances of different wrappers for /proc/ process related
meta files: "stat" and "status", see the documentation for procfs.pidstat
and procfs.pidstatus for further info about those classes.
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Loads the environment variables for this process. The entries then
become available via the 'environ' member, or via the 'environ'
dict key when accessing as p["environ"].
E.g.:
>>> all_processes = procfs.pidstats()
>>> firefox_pid = all_processes.find_by_name("firefox")
>>> firefox_process = all_processes[firefox_pid[0]]
>>> print firefox_process["environ"]["PWD"]
/home/acme
>>> print len(firefox_process.environ.keys())
66
>>> print firefox_process["environ"]["SHELL"]
/bin/bash
>>> print firefox_process["environ"]["USERNAME"]
acme
>>> print firefox_process["environ"]["HOME"]
/home/acme
>>> print firefox_process["environ"]["MAIL"]
/var/spool/mail/acme
>>>
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Provides access to all the processes in the system, to get a picture of
how many processes there are at any given moment.
The entries can be accessed as a dictionary, keyed by pid. Also there are
methods to find processes that match a given COMM or regular expression.
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This operation will throw away the current dictionary contents,
if any, and read all the pid files from /proc/, instantiating a
'process' instance for each of them.
This is a high overhead operation, and should be avoided if the
perf python binding can be used to detect when new threads appear
and existing ones terminate.
In RHEL it is found in the python-perf rpm package.
More information about the perf facilities can be found in the
'perf_event_open' man page.
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Information about IRQs in the system. A dictionary keyed by IRQ number
will have as its value another dictionary with "cpu", "type" and "users"
keys, with the SMP affinity mask, type of IRQ and the drivers associated
with each interrupt.
The information comes from the /proc/interrupts file, documented in
'man procfs(5)', for instance, the 'cpu' dict is an array with one entry
per CPU present in the sistem, each value being the number of interrupts
that took place per CPU.
E.g.:
>>> import procfs
>>> interrupts = procfs.interrupts()
>>> thunderbolt_irq = interrupts.find_by_user("thunderbolt")
>>> print thunderbolt_irq
34
>>> thunderbolt = interrupts[thunderbolt_irq]
>>> print thunderbolt
{'affinity': [0, 1, 2, 3], 'type': 'PCI-MSI', 'cpu': [3495, 0, 81, 0], 'users': ['thunderbolt']}
>>>
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Looks up a interrupt number by the name of one of its users"
E.g.:
>>> import procfs
>>> interrupts = procfs.interrupts()
>>> thunderbolt_irq = interrupts.find_by_user("thunderbolt")
>>> print thunderbolt_irq
34
>>> thunderbolt = interrupts[thunderbolt_irq]
>>> print thunderbolt
{'affinity': [0, 1, 2, 3], 'type': 'PCI-MSI', 'cpu': [3495, 0, 81, 0], 'users': ['thunderbolt']}
>>>
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Looks up a interrupt number by a regex that matches names of its users"
E.g.:
>>> import procfs
>>> import re
>>> interrupts = procfs.interrupts()
>>> usb_controllers = interrupts.find_by_user_regex(re.compile(".*hcd"))
>>> print usb_controllers
['22', '23', '31']
>>> print [ interrupts[irq]["users"] for irq in usb_controllers ]
[['ehci_hcd:usb4'], ['ehci_hcd:usb3'], ['xhci_hcd']]
>>>
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Parses the kernel command line (/proc/cmdline), turning it into a dictionary."
Useful to figure out if some kernel boolean knob has been turned on,
as well as to find the value associated to other kernel knobs.
It can also be used to find out about parameters passed to the
init process, such as 'BOOT_IMAGE', etc.
E.g.:
>>> import procfs
>>> kcmd = procfs.cmdline()
>>> print kcmd.keys()
['LANG', 'BOOT_IMAGE', 'quiet', 'rhgb', 'rd.lvm.lv', 'ro', 'root']
>>> print kcmd["BOOT_IMAGE"]
/vmlinuz-4.3.0-rc1+
>>>
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by this class. The 'man lscpu(1)' also has information about a program that
uses the '/proc/cpuinfo' file.
Using this class one can obtain the number of CPUs in a system:
>>> cpus = procfs.cpuinfo()
>>> print cpus.nr_cpus
4
It is also possible to figure out aspects of the CPU topology, such as
how many CPU physical sockets exists, i.e. groups of CPUs sharing
components such as CPU memory caches:
>>> print len(cpus.sockets)
1
Additionally dictionary with information common to all CPUs in the system
is available:
>>> print cpus["model name"]
Intel(R) Core(TM) i7-3667U CPU @ 2.00GHz
>>> print cpus["cache size"]
4096 KB
>>>
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i.e. libraries.
The 'vm_start' and 'vm_end' in turn can be used when trying to resolve
processor instruction pointer addresses to a symbol name in a library.
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>>> import procfs
>>> processes = procfs.pidstats()
>>> sshd = processes.find_by_name("sshd")
>>> sshd_maps = procfs.smaps(sshd[0])
>>> for i in range(len(sshd_maps)):
... if 'x' in sshd_maps[i].perms:
... print "%s: %s" % (sshd_maps[i].name, sshd_maps[i].perms)
...
/usr/sbin/sshd: r-xp
/usr/lib64/libnss_files-2.20.so: r-xp
/usr/lib64/librt-2.20.so: r-xp
/usr/lib64/libkeyutils.so.1.5: r-xp
/usr/lib64/libkrb5support.so.0.1: r-xp
/usr/lib64/libfreebl3.so: r-xp
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...
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separate CPUs. Please refer to 'man procfs(5)' for further information
about the '/proc/stat' file, that is the source of the information provided
by this class.
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