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        >>> 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

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            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
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    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
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        line/field.
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        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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        perf python binding can be used to detect when new threads appear
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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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zinterrupts.reloadcCs�i}g|d<|djt|d��t|�}||jkr�|ddd�|d|j�D�7<||jkr�||j|d<||jdkr�dd�||djd�D�|d	<ng|d	<|S)
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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']}
        >>>
        r�N)r1r�r2)r+�userrAr
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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 ]
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          4

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