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Diffstat (limited to 'usr.sbin/swapinfo/README')
| -rw-r--r-- | usr.sbin/swapinfo/README | 38 |
1 files changed, 0 insertions, 38 deletions
diff --git a/usr.sbin/swapinfo/README b/usr.sbin/swapinfo/README deleted file mode 100644 index f8019a8..0000000 --- a/usr.sbin/swapinfo/README +++ /dev/null @@ -1,38 +0,0 @@ -swapinfo -======== - -Swapinfo is designed to provide some information to the user about the -state of the swap space on the system. I've written it based on a -brief (!) perusal of the VM code in 386BSD. I could be pretty confused -about how it all fits together, and perhaps this is totally bogus. -It seems to work for me, though. - -How it works: - -During startup, the system traverses the list of configured swap partitions, -and determines the size of the various partitions. As each new partition -is added for swapping (via swapon), the free space on that disk is added -to a linked list of free space. Adjacent areas are coalesced to form -larger areas. The swapping algorithm seems to take the first free section -that it finds [?]. - -Swapinfo reads in the list of configured swap partitions from the /dev/kmem, -to determine the size of the partitions. It then traverses the list -of free space, figuring up how much is still available and how much -has therefore been used. Things get a little hairy in that the swap space -is divided amongst the configured swap partitions so that the first -4096 blocks of swap go on the first swap partition, the second 4096 on -the second swap partition, and so on. This works out to be a fairly -simple bit of code, though. - -More caveats: - -This works on my system. Your milage may vary. Since I'm reading /dev/kmem -to follow a linked list, the program could easily get lost looking for -some free space if anything got changed between reads of /dev/kmem. -If you get occasional inconsistant results, ignore 'em. - -Feel free to send bug reports, flames, etc., to: - -Kevin Lahey -kml@rokkaku.atl.ga.us |
