# -*- python -*-
'''
xpybar – xmobar replacement written in python
Copyright © 2014, 2015, 2016, 2017, 2018, 2019 Mattias Andrée (maandree@kth.se)
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
'''
class Memory:
'''
Retrieve memory information
@variable mem_total:int Total usable RAM (physical RAM minus a few reserved bit, in KB
minus kernel binary code), in KB
@variable mem_free:int Amount of unused usable physical RAM, in KB
@variable mem_used:int Amount of used usable physical RAM, in KB
@variable buffers:int Relatively temporary storage for raw disc blocks, in KB
@variable cached:int In-memory cache for files read from the disc (the pagecache), in KB.
Does not include swap_cached.
@variable swap_cached:int Memory that once was swapped out, is swapped back in but still
also is in the swapfile, in KB
@variable swap_total:int Total amount of swap space available, in KB
@variable swap_free:int Amount of unused swap space available, in KB
@variable swap_used:int Memory which has been evicted from RAM to swap space, in KB
@variable shmem:int? Amount of memory allocated as shared memory, in KB
@variable slab:int? In-kernel data structures cache, in KB
@variable hardware_corrupted:int? Hardware corrupted memory, in KB
@variable keys:frozenset List of all keys
'''
def __init__(self):
'''
Constructor
'''
meminfo = None
with open('/proc/meminfo', 'rb') as file:
meminfo = file.read()
meminfo = meminfo.decode('utf-8', 'replace')
meminfo = filter(lambda x : not x == '', meminfo.split('\n'))
self.__info = {}
for line in meminfo:
line = filter(lambda x : not x == '', line.replace(':', ' ').split(' '))
line = list(line)[:2]
self.__info[line[0]] = int(line[1])
self.keys = self.__info.keys()
self.mem_total = self['MemTotal']
self.buffers = self['Buffers']
self.cached = self['Cached']
self.mem_free = self['MemFree'] + self.buffers + self.cached + self.get('KReclaimable', self.get('SReclaimable'))
self.mem_used = self.mem_total - self.mem_free
self.swap_cached = self['SwapCached']
self.swap_total = self['SwapTotal']
self.swap_free = self['SwapFree']
self.swap_used = self.swap_total - (self.swap_free + self.swap_cached)
self.shmem = self.get('Shmem', None)
self.slab = self.get('Slab', None)
self.hardware_corrupted = self.get('HardwareCorrupted', None)
def __contains__(self, key):
'''
Get whether or not a key is available
@param key:str The key
@return :bool The availability
'''
return key in self.__info
def get(self, key, default = 0):
'''
Look up a field from '/proc/meminfo'
@param key:str The field name
@param default:int The value to return if the field does not exist
@return :int The value of the field, without the unit (KB if any)
This keys should be available, but are most probably more available:
@key MemTotal Total usable RAM (physical RAM minus a few reserved bit minus kernel binary code)
@key MemFree Amount of unused usable physical RAM
@key MemAvailable An estimate of how much memory is available for starting new applications, without swapping
@key Buffers Relatively temporary storage for raw disc blocks
@key Cached In-memory cache for files read from the disc (the pagecache).
Does not include SwapCached.
@key SwapCached Memory that once was swapped out, is swapped
back in but still also is in the swapfile
@key Active Memory that has been used more recently and
usually not reclaimed unless absolutely necessary
@key Inactive Memory which has been less recently used. It is
more eligible to be reclaimed for other purposes
@key Active(anon) [To be documented.]
@key Inactive(anon) [To be documented.]
@key Active(file) [To be documented.]
@key Inactive(file) [To be documented.]
@key Unevictable [To be documented.]
@key Mlocked [To be documented.]
@key HighTotal Total amount of highmem. Highmem is all memory above ~860MB of physical
memory. Highmem areas are for use by user-space programs, or for the page
cache. The kernel must use tricks to access this memory, making it slower
to access than lowmem.
@key HighFree Amount of free highmem
@key LowTotal Total amount of lowmem. Lowmem is memory which can be used for everything
that highmem can be used for, but it is also available for the kernel's use
for its own data structures. Among many other things, it is where everything
from Slab is allocated. Bad things happen when you're out of lowmem.
@key LowFree Amount of free lowmem
@key MmapCopy [To be documented.]
@key SwapTotal Total amount of swap space available
@key SwapFree Amount of unused swap space available
@key Dirty Memory which is waiting to get written back to the disc
@key Writeback Memory which is actively being written back to the disc
@key AnonPages Non-file backed pages mapped into userspace page tables
@key Mapped Files which have been mmaped, such as libraries
@key Shmem Amount of memory consumed in tmpfs(5) filesystems
@key KReclaimable Kernel allocations that the kernel will attempt to reclaim under memory
pressure. Includes SReclaimable, and other direct allocations with a shrinker.
@key Slab In-kernel data structures cache
@key SReclaimable Part of Slab, that might be reclaimed, such as caches
@key SUnreclaim Part of Slab, that cannot be reclaimed on memory pressure
@key KernelStack Amount of memory allocated to kernel stacks
@key PageTables Amount of memory dedicated to the lowest level of page tables
@key Quicklists [To be documented.]
@key NFS_Unstable NFS pages sent to the server, but not yet committed to stable storage
@key Bounce Memory used for block device “bounce buffers”
@key WritebackTmp Memory used by FUSE for temporary writeback buffers
@key CommitLimit The total amount of memory currently available to be allocated
on the system. Based on overcommit ratio.
@key Committed_AS The amount of memory presently allocated on the system.
@key VmallocTotal Total size of vmalloc memory area
@key VmallocUsed Amount of vmalloc area which is used
@key VmallocChunk Largest contiguous block of vmalloc area which is free
@key Percpu [To be documented.]
@key HardwareCorrupted [To be documented.]
@key LazyFree Shows the amount of memory marked by madvise(2) MADV_FREE
@key AnonHugePages Non-file backed huge pages mapped into userspace page tables
@key ShmemHugePages Memory used by shared memory (shmem) and tmpfs(5) allocated with huge pages
@key ShmemPmdMapped Shared memory mapped into user space with huge pages
@key CmaTotal Total CMA (Contiguous Memory Allocator) pages
@key CmaFree Free CMA (Contiguous Memory Allocator) pages
@key HugePages_Total The size of the pool of huge pages
@key HugePages_Free The number of huge pages in the pool that are not yet allocated
@key HugePages_Rsvd This is the number of huge pages for which a commitment to allocate from
the pool has been made, but no allocation has yet been made. These reserved
huge pages guarantee that an application will be able to allocate a huge
page from the pool of huge pages at fault time
@key HugePages_Surp This is the number of huge pages in the pool above the value in
/proc/sys/vm/nr_hugepages. The maximum number of surplus huge pages is
controlled by /proc/sys/vm/nr_overcommit_hugepages.
@key Hugepagesize The size of huge pages
@key Hugetlb [To be documented.]
@key DirectMap4k Number of bytes of RAM linearly mapped by kernel in 4kB pages
@key DirectMap2M Number of bytes of RAM linearly mapped by kernel in 2MB pages
@key DirectMap4M Number of bytes of RAM linearly mapped by kernel in 4MB pages
@key DirectMap1G Number of bytes of RAM linearly mapped by kernel in 1GB pages
'''
return self.__info.get(key, default)
def __getitem__(self, key):
'''
Equivalent to `self.get(key)`, except
it fails rather than return 0 if the
field does not exist
'''
return self.__info[key]
