The difference between buffers and cache
2011-05-09 00:55
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The difference between buffers and cache
Buffers areassociated with a specific block device, and cover caching of filesystem
metadata as well as tracking in-flight pages. The cache only contains
parked file data. That is, the buffers remember what's in directories,
what file permissions are, and keep track of what memory is being
written from or read to for a particular block device. The cache only
contains the contents of the files themselves.
Corrections and
additions to this section welcome; I've done a bit of guesswork based on
tracing how /proc/meminfo is produced to arrive at these conclusions.
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