Re: Page cache behaviour

On 2012-05-13, yoxoman <invalid@xxxxxxxxxxxxxxx> wrote:
Hi,

The page cache works well on my system, caching disk data for faster
subsequent accesses. It is easily seen by launching the same process
twice.

However, stopping a process on my system also free a certain amount of
the system page cache (as reported by the Cached section of free).

Thus, it seems that some sort of page cache entries are not considered
necessary by the kernel to be kept after process exit. What are these
kind of pages?

Thanks.

At least some of the pages freed from the page cache when you
terminate a process might be temporary files that the program
deletes as it exits, or a temporary file it held open but had
unlinked from its directory.

HTH

--
Robert Riches
spamtrap42@xxxxxxxxxxxxxx
(Yes, that is one of my email addresses.)
.

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