From mboxrd@z Thu Jan  1 00:00:00 1970
From: Yoann Padioleau <pad@fb.com>
To: Fans of the OS Plan 9 from Bell Labs <9fans@9fans.net>
Date: Sat,  7 Jun 2014 04:36:59 +0000
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Subject: [9fans] advanced core Linux kernel features not in plan9
Topicbox-Message-UUID: f6f4849a-ead8-11e9-9d60-3106f5b1d025

Hi,

I was curious to know which core features of the Linux kernel are not imple=
mented
in the plan9 kernel. By core I mean that I know plan9 does not have all the=
 drivers,
filesystems, buses, etc Linux has, but it has many of its core
features (virtual memory, paging, swapping, demand loading, copy on write, =
etc),
and even more.

For instance I was not able to find any code related to the buffer cache Li=
nux has.
If you open a big file in a plan9 process, then close it, and later you ope=
n it again,
will you pay the IO again? Or is it cached somewhere?