From: Daniel Kiper <dkiper@net-space.pl>
To: ian.campbell@citrix.com, akpm@linux-foundation.org,
andi.kleen@intel.com, haicheng.li@linux.intel.com,
fengguang.wu@intel.com, jeremy@goop.org, konrad.wilk@oracle.com,
dan.magenheimer@oracle.com, v.tolstov@selfip.ru, pasik@iki.fi,
dave@linux.vnet.ibm.com, wdauchy@gmail.com, rientjes@google.com,
xen-devel@lists.xensource.com, linux-kernel@vger.kernel.org,
linux-mm@kvack.org
Subject: [PATCH 1/3] mm: Optimize pfn calculation in online_page()
Date: Mon, 28 Mar 2011 11:23:10 +0200 [thread overview]
Message-ID: <20110328092310.GB13826@router-fw-old.local.net-space.pl> (raw)
If CONFIG_FLATMEM is enabled pfn is calculated in online_page()
more than once. It is possible to optimize that and use value
established at beginning of that function.
Signed-off-by: Daniel Kiper <dkiper@net-space.pl>
---
mm/memory_hotplug.c | 2 +-
1 files changed, 1 insertions(+), 1 deletions(-)
diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index 321fc74..f0651ae 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -375,7 +375,7 @@ void online_page(struct page *page)
#endif
#ifdef CONFIG_FLATMEM
- max_mapnr = max(page_to_pfn(page), max_mapnr);
+ max_mapnr = max(pfn, max_mapnr);
#endif
ClearPageReserved(page);
--
1.5.6.5
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next reply other threads:[~2011-03-28 9:23 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-03-28 9:23 Daniel Kiper [this message]
2011-03-28 15:24 ` Dave Hansen
2011-03-28 22:41 ` David Rientjes
2011-03-28 22:44 ` Jesper Juhl
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