add mem

Signed-off-by: Mattias Andrée <maandree@operamail.com>

1 files changed, 125 insertions, 0 deletions

diff --git a/src/plugins/mem.py b/src/plugins/mem.py
new file mode 100644
index 0000000..5239c1d
--- /dev/null
+++ b/src/plugins/mem.py
@@ -0,0 +1,125 @@
+# -*- python -*-
+'''
+xpybar – xmobar replacement written in python
+Copyright © 2014  Mattias Andrée (maandree@member.fsf.org)
+
+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
+    '''
+    
+    
+    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.mem_total = self['MemTotal']
+        self.mem_free = self['MemFree']
+        self.buffers = self['Buffers']
+        self.cached = self['Cached']
+        self.mem_used = self.mem_total - (self.mem_free + self.buffers + self.cached)
+        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['Shmem'] if 'Shmem' in self else None
+        self.slab = self['Slab'] if 'Slab' in self else None
+        self.hardware_corrupted = self['HardwareCorrupted'] if 'HardwareCorrupted' in self else 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 __getitem__(self, key):
+        '''
+        Lookup a field from '/proc/meminfo'
+        
+        @param   key:str  The field name
+        @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  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  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  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  PageTables     Amount of memory dedicated to the lowest level of page tables
+        @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  AnonHugePages  Non-file backed huge pages mapped into userspace page tables
+        '''
+        return self.__info[key]
+