Simple question on laundry memory

mark_j said:
It's used memory, soon to be available memory (inactive) or could even be re-determined to be unavailable (active). Either way, it's unavailable at that instance.
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  1. What should I do to monitor laundry memory in Zabbix?
  2. What can cause memory to get stuck in laundry?
Sometimes I see laundry slowly growing, until all memory is used up.
 
That might be an indicator for a memory leak. You probably want to monitor memory use overall, not laundry specifically. Generally speaking, a growing laundry list may point at pages that never properly get around to being swapped out.
There's a pretty good write up on swapping and laundry on the forum:

forums.freebsd.org

Exploring Swap on FreeBSD

Exploring Swap on FreeBSD Free Memory is Wasted Memory or How to Make The Best Use of Swap On modern Unix-like systems such as FreeBSD, “swapping” refers to the activity of paging out the contents of memory to a disk and then paging it back in on demand. The page-out activity occurs in...
forums.freebsd.org forums.freebsd.org

Addendum: you probably could also be running without any swap at all. I suppose that could also lead to pages never getting paged and instead staying on the laundry list, if I'm not mistaken.
 
cmoerz said:
That might be an indicator for a memory leak. You probably want to monitor memory use overall, not laundry specifically. Generally speaking, a growing laundry list may point at pages that never properly get around to being swapped out.
There's a pretty good write up on swapping and laundry on the forum:

forums.freebsd.org

Exploring Swap on FreeBSD

Exploring Swap on FreeBSD Free Memory is Wasted Memory or How to Make The Best Use of Swap On modern Unix-like systems such as FreeBSD, “swapping” refers to the activity of paging out the contents of memory to a disk and then paging it back in on demand. The page-out activity occurs in...
forums.freebsd.org forums.freebsd.org

Addendum: you probably could also be running without any swap at all. I suppose that could also lead to pages never getting paged and instead staying on the laundry list, if I'm not mistaken.
Click to expand...
I do run swap. Okay, I'll read that thread
 
tarkhil said:
  1. What should I do to monitor laundry memory in Zabbix?
  2. What can cause memory to get stuck in laundry?
Sometimes I see laundry slowly growing, until all memory is used up.
Click to expand...
1. Ask Zabbix? I have no idea about zabbix.
2. It will be stuck if it's not needed. If it's needed & not being released by the kernel, then it's a bug in either the thread or the queue or both.
They go fromlaundry to inactive or if in laundry and get accessed they go to the end of the queue.

I guess in an ideal world laundry should quickly move pages out to inactive but it doesn't because other things can happen to affect that.
 
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