Messages in this thread | | | Date | Tue, 22 Oct 2002 20:43:13 +0200 | From | bert hubert <> | Subject | vm scenario tool / mincore(2) functionality for regular pages? |
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I'm building a tool to subject the VM to different scenarios and I'd like to be able to determine if a page is swapped out or not. For a file I can easily determine if a page is in memory (in the page cache) or not using the mincore(2) system call.
I want to expand my tool so it can investigate which of its pages are swapped out under cache pressure or real memory pressure.
However, to do this, I need a way to determine if a page is there or if it is swapped out. My two questions are:
1) is there an existing way to do this (the kernel obviously knows)
2) would it be correct to expand mincore to also work on non-filebacked memory so it works for 'swap-backed' memory too?
Thanks.
Some current output of the scenario tool:
vmloader> alloc 25 Arena now 25 megabytes, 6250 pages
vmloader> sweep Sweeping from mbyte 0 to 25, 6250 pages. Done
vmloader> rusage minor: 6250, major: 2, swaps: 0
vmloader> sweep 0 12 Sweeping from mbyte 0 to 12, 1440 pages. Done
vmloader> rusage minor: 0, major: 0, swaps: 0
vmloader> touch Touching from mbyte 0 to 25, 6250 pages. Done
vmloader> rusage minor: 6249, major: 0, swaps: 0
vmloader> rsweep Random sweeping from mbyte 0 to 25, 6250 pages. Done
vmloader> rusage minor: 0, major: 0, swaps: 0
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