What is VMallocChunk?

VMallocUsed: The total amount of memory, in kilobytes, of used virtual address space. VMallocChunk: The largest contiguous block of memory, in kilobytes, of available virtual address space.

What is Meminfo?

– The ‘/proc/meminfo’ is used by to report the amount of free and used memory (both physical and swap) on the system as well as the shared memory and buffers used by the kernel.

What is anonymous memory?

Anonymous memory is a memory mapping with no file or device backing it. This is how programs allocate memory from the operating system for use by things like the stack and heap. Initially, an anonymous mapping only allocates virtual memory. The new mapping starts with a redundant copy on write mapping of the zero page.

What is SwapTotal?

SwapTotal — The total amount of swap available, in kilobytes. SwapFree — The total amount of swap free, in kilobytes. Dirty — The total amount of memory, in kilobytes, waiting to be written back to the disk.

What is Slabtop?

DESCRIPTION top slabtop displays detailed kernel slab cache information in real time. It displays a listing of the top caches sorted by one of the listed sort criteria. It also displays a statistics header filled with slab layer information.

What is SReclaimable?

It means that SReclaimable is memory that is used by kernel (for example, as a filesystem cache), but should any other need arise, it might be used for other purposes – for example to satisfy memory requests from user applications that cannot be satisfied otherwise, for example by using free ( MemFree ) memory.

What is reclaimable memory?

So, in addition to used and free, we have a third category of memory usage: Reclaimable memory. This type of memory allocation is considered reclaimable because the system can easily reclaim it for other purposes.

What is direct reclaim?

Direct reclaim (where a process that is allocating memory has to do some of the work of freeing up memory used by others) is particularly problematic since it can introduce surprising delays; it reduces the isolation between users.