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2002-09-24 / 2.5.39+ VM to go "non blocking"

http://kerneltrap.org/node.php?id=425

Linus has started integrating some of Andrew Morton's mm patches
into his BK repository as usual - what is interesting about this
round of merges is the inclusion of Andrew's most radical changes
- a non-blocking page writeback system. The changelogs are very
detailed and interesting so I won't explain further.

The goal of this system is mainly to improve multi threaded IO
performance and is very exciting as it looks like akpm & co will
push 2.6 (close) to the top of the VM heap!

ってことで、マルチスレッド時のI/Oが改善されるもよう。

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