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Message-ID: <20061027083405.GA18899@skynet.ie> Date: Fri, 27 Oct 2006 09:34:06 +0100 From: mel@...net.ie (Mel Gorman) To: akpm@...l.org Cc: kmannth@...ibm.com, linux-kernel@...r.kernel.org Subject: [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@....ul.ie> --- diff -rup -X /usr/src/patchset-0.6/bin//dontdiff linux-2.6.19-rc2-mm2-clean/mm/page_alloc.c linux-2.6.19-rc2-mm2-fix_hole_pages/mm/page_alloc.c --- linux-2.6.19-rc2-mm2-clean/mm/page_alloc.c 2006-10-23 09:53:24.000000000 +0100 +++ linux-2.6.19-rc2-mm2-fix_hole_pages/mm/page_alloc.c 2006-10-26 10:33:30.000000000 +0100 @@ -2511,7 +2511,7 @@ unsigned long __init __absent_pages_in_r /* 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; - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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