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make mapped executable pages the first class citizen (with test cases)

From:  Wu Fengguang <fengguang.wu@intel.com>
To:  Andrew Morton <akpm@linux-foundation.org>
Subject:  [PATCH 0/3] make mapped executable pages the first class citizen (with test cases)
Date:  Mon, 08 Jun 2009 17:10:44 +0800
Cc:  KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>

Andrew,

I managed to back this patchset with two test cases :)

They demonstrated that
- X desktop responsiveness can be *doubled* under high memory/swap pressure
- it can almost stop major faults when the active file list is slowly scanned
  because of undergoing partially cache hot streaming IO

The details are included in the changelog.

Thanks,
Fengguang
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