The sar manpage says :
pgpgin/s - Total number of kilobytes the system paged in from disk per second.
pgpgout/s - Total number of kilobytes the system paged out to disk per second.
fault/s - Number of page faults (major + minor) made by the system per second. This is not a count of page faults that generate I/O, because some page faults can be resolved without I/O.
majflt/s - Number of major faults the system has made per second, those which have required loading a memory page from disk
Does this measure swap activity? What paging does it refer to? Getting data from disk is considered paging?
Also, I've read that large and constant values for majflt/s is not good. why?
Example :
Sar -B 12:00:08 AM pgpgin/s pgpgout/s fault/s majflt/s 12:10:05 AM 207.55 2522.76 5109.80 0.01 12:20:07 AM 303.83 274.64 4446.52 0.00 12:30:05 AM 53.85 251.81 4183.98 0.00 12:40:05 AM 43.19 234.05 4181.53 0.00 12:50:06 AM 88.89 265.46 4311.81 0.00 01:00:09 AM 64.60 232.72 4239.05 0.00 01:10:07 AM 69.71 216.89 4523.03 0.00 01:20:06 AM 81.37 250.02 4359.93 0.00 01:30:06 AM 79.77 246.28 4291.49 0.00 01:40:02 AM 42.89 227.22 4319.88 0.02 01:50:06 AM 214.46 441.33 4760.78 0.00 [...]