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authorMattias Andrée <maandree@kth.se>2019-10-10 22:02:17 +0200
committerMattias Andrée <maandree@kth.se>2019-10-10 22:02:17 +0200
commit42483cf2421b21795a81f2c78e5c4d8bc32ed7bb (patch)
tree460ca22ce4714f4be5d697e189179b9a9d98e58b /src/plugins/mem.py
parentFix typo (diff)
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Update mem.py
Signed-off-by: Mattias Andrée <maandree@kth.se>
Diffstat (limited to 'src/plugins/mem.py')
-rw-r--r--src/plugins/mem.py140
1 files changed, 97 insertions, 43 deletions
diff --git a/src/plugins/mem.py b/src/plugins/mem.py
index de30d7e..a480110 100644
--- a/src/plugins/mem.py
+++ b/src/plugins/mem.py
@@ -56,21 +56,21 @@ class Memory:
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.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.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['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
+ self.shmem = self.get('Shmem', None)
+ self.slab = self.get('Slab', None)
+ self.hardware_corrupted = self.get('HardwareCorrupted', None)
def __contains__(self, key):
@@ -81,48 +81,102 @@ class Memory:
@return :bool The availability
'''
return key in self.__info
-
-
- def __getitem__(self, key):
+
+
+ def get(self, key, default = 0):
'''
Look up a field from '/proc/meminfo'
- @param key:str The field name
- @return :int The value of the field, without the unit (KB if any)
+ @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 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
+ @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[key]
+ 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]