Non-linear Remap Vs. VM Cleanup: Performance Hit
From: D. Cooper Stevenson
Date: Wed Feb 25 2015 - 01:36:34 EST
Hello All,
I read the Linus's release for RC1. One of his favorite features in the
release are, "actually some vm cleanups, where this release is getting
rid of the largely unused non-linear remapping code (replaced with just
emulating it with lots of smaller mappings) and unifies the NUMA and
PROTNONE handling for page tables."
I understand that non-linear page remapping is unused (and, presumably,
reduces the code base size) but according to the remap_file_pages man
page (http://man7.org/linux/man-pages/man2/remap_file_pages.2.html)
non-linear system will be, "eventually be replaced by a slower in-kernel
emulation."
Was this a change of necessity? What gives?
Also, would you please Cc: me on your replies as I am not a member of
the mailing list?
Best Regards,
-Cooper
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