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Ever further off topic :)Ever further off topic :)Posted Apr 22, 2009 9:20 UTC (Wed) by michaeljt (subscriber, #39183)In reply to: Another Linux capabilities hole found by i3839 Parent article: Another Linux capabilities hole found
Does Linux actually cache file data, or only block data? I would have thought that user space filesystem latency could be reduced quite a bit by clever caching - the kernel caches data from file reads (with a bit of read-ahead), and writes to files, and sends them to the user space filesystem as a package. If the filesystem has an underlying block device, this could be done shortly before the block device cache is due to be flushed.
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Ever further off topic :) Posted Apr 22, 2009 22:57 UTC (Wed) by nix (subscriber, #2304) [Link]
Of course Linux caches file data: in fact it won't work without it.
Absolutely everything that gets put in a page in memory (all file data, anonymous mmaped pages, you name it) has to pass through the page cache first. Executables *run* from the page cache: their text pages reside nowhere else.
There *is* a cache of disk blocks (the buffer cache), but these days it's
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