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Suspend a process in Linux

Posted on 2006-07-23
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Last Modified: 2012-05-05
Hi expert

How do swapout a suspended process   in Linux ? i.e

It should be moved from Main memory to swap without killing the process
and later on when resumed it must be swapped in back to main memory

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Question by:mmadhuso
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by:Harisha M G
ID: 17164035
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by:Duncan Roe
ID: 17164322
bg & fg as mentioned by mgh_mgharish suspend run a suspended process in background or foreground / interactively. You suspend the current interactive program with SIGSTOP (control-Z usually).
From your question I imagine you knew all that already.
Whether a process is swapped out or in is really not a regular user's concern. Linux manages memory as it will. Really, "Swap" is an old-fashioned term - Linux is a demand - paging system where the least recently used pages of memory are freed up as required. Those that have been written to (jargon is "are dirty") are written to "swap"; those that are (jargon) "clean" are simply discarded. "Clean" includes program and library code, which are paged back in from the executable when again needed. If you google for "demand paging" you may find some links - I have to go now.
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by:ravenpl
ID: 17165767
I can only confirm what duncan_roe pointed out. There is no way under linux to force taks to moved to swap. Interesting, but You can prevent taks(some of its memory pages) from beeing moved to swap...
Also, just for a recors: after You SIGSTOP the application, You have to SIGCONT to wake it up again.
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ahoffmann earned 100 total points
ID: 17165960
> How do swapout a suspended process   in Linux ?
you don't need to do that, the kernel does it automatically for you, hence there is no API for it.
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