What is active Meminfo?

Active — The total amount of buffer or page cache memory, in kilobytes, that is in active use. This is memory that has been recently used and is usually not reclaimed for other purposes. Inactive — The total amount of buffer or page cache memory, in kilobytes, that are free and and available.

How do you run Meminfo?

On Linux you can use the command cat /proc/meminfo to determine how much memory the computer has. This command displays the information stored in the meminfo file located in the /proc directory. The total amount of memory will be displayed as MemTotal, shown in the example in bold.

What is inactive Anon?

Inactive(anon): Anonymous memory that has not been used recently and can be swapped out. Active(file): Pagecache memory that has been used more recently and usually not reclaimed until needed. Inactive(file): Pagecache memory that can be reclaimed without huge performance impact.

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 Meminfo committedas?

I am some clarification in statistics of Committed_AS. As per different docs, it is “The amount of memory presently allocated on the system. The committed memory is a sum of all of the memory which has been allocated by processes, even if it has not been “used” by them as of yet.”

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 is the precise name for what the linux kernel is doing in the case called out by the article. http://lwn.net/Articles/396561/ But thanks for the snark anyway!

What is reclaimable memory in Dynatrace?

Introducing the ‘Reclaimable memory’ metric This is a simple, yet powerful categorization. It helps in making sense of how much memory is still available for processes and whether or not there is a risk of disk swapping. It also makes it possible to observe growth trends in preparation for system scaling, etc.

What is VM Min_free_kbytes?

min_free_kbytes: This is used to force the Linux VM to keep a minimum number of kilobytes free. The VM uses this number to compute a watermark[WMARK_MIN] value for each lowmem zone in the system. Each lowmem zone gets a number of reserved free pages based proportionally on its size.

https://www.youtube.com/watch?v=7DzMKEW2nvI