Carlos E. R. wrote:
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The Thursday 2007-09-20 at 09:53 -0600, Bill Anderson wrote:
kernel only needs to send the anonymous memory pages of an
application to swap space, the text (code) can be retrieved from the
disk file for the application.
Which is probably slower than just using swap for all (instead of seeking
all around the disk).
This paging concept has been around for awhile. Even Unix has doesn't page
text to swap, as the writes are just too expensive. With a good elevator
algorithm the cost of seeks is minimal.
I know, even windows uses that method. But the real reason was that swap
space was expensive, when the method was invented; that is no longer the
case.
There is a noticeable difference in speed from reading code from each
respective file than compared to read from contiguous raw swap space.
It can be worse if it first have to read the inode, then the code, which I
think it might do.
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Cheers,
Carlos E. R.
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Objects for the dentry and inode remain in the cache, since there is a
reference to them. The kernel even keeps objects around for which their
is no longer a file object. Of course, these entries are discarded if
there is a need for the memory. You can see all this in /proc/slabinfo.
Bill Anderson
WW7BA
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