openkylin
/
linux
mirror of https://gitee.com/openkylin/linux.git
9
0
Fork 0
Code Issues Projects Releases Wiki Activity

[PATCH] Calculation fix for memory holes beyong the end of physical memory 

absent_pages_in_range() made the assumption that users of the
arch-independent zone-sizing API would not care about holes beyound the end
of physical memory.  This was not the case and was "fixed" in a patch
called "Account for holes that are outside the range of physical memory".
However, when given a range that started before a hole in "real" memory and
ended beyond the end of memory, it would get the result wrong.  The bug is
in mainline but a patch is below.

It has been tested successfully on a number of machines and architectures.
Additional credit to Keith Mannthey for discovering the problem, helping
identify the correct fix and confirming it Worked For Him.

Signed-off-by: Mel Gorman <mel@csn.ul.ie>
Cc: keith mannthey <kmannth@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Mel Gorman 2006-10-28 10:38:59 -07:00 committed by Linus Torvalds
parent 057647fc47
commit 0c6cb97463
1 changed files with 1 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
mm/page_alloc.c
View File

@ -2261,7 +2261,7 @@ unsigned long __init __absent_pages_in_range(int nid,
/* Account for ranges past physical memory on this node */
if (range_end_pfn > prev_end_pfn)
hole_pages = range_end_pfn -
hole_pages += range_end_pfn -
max(range_start_pfn, prev_end_pfn);
return hole_pages;