From: Gary Hade <garyhade@us.ibm.com>
To: linux-mm@kvack.org
Cc: Andrew Morton <akpm@linux-foundation.org>,
Yasunori Goto <y-goto@jp.fujitsu.com>,
Badari Pulavarty <pbadari@us.ibm.com>, Mel Gorman <mel@csn.ul.ie>,
Chris McDermott <lcm@us.ibm.com>, Gary Hade <garyhade@us.ibm.com>
Subject: [PATCH] Add memory hotremove config option to x86_64
Date: Thu, 4 Sep 2008 13:21:53 -0700 [thread overview]
Message-ID: <20080904202153.GA26795@us.ibm.com> (raw)
Add memory hotremove config option to x86_64
Memory hotremove functionality can currently be configured into
the ia64, powerpc, and s390 kernels. This patch makes it possible
to configure the memory hotremove functionality into the x86_64
kernel as well.
Signed-off-by: Gary Hade <garyhade@us.ibm.com>
---
arch/x86/Kconfig | 3 +++
arch/x86/mm/init_64.c | 18 ++++++++++++++++++
2 files changed, 21 insertions(+)
Index: linux-2.6.27-rc5/arch/x86/Kconfig
===================================================================
--- linux-2.6.27-rc5.orig/arch/x86/Kconfig 2008-09-03 13:33:59.000000000 -0700
+++ linux-2.6.27-rc5/arch/x86/Kconfig 2008-09-03 13:34:55.000000000 -0700
@@ -1384,6 +1384,9 @@
def_bool y
depends on X86_64 || (X86_32 && HIGHMEM)
+config ARCH_ENABLE_MEMORY_HOTREMOVE
+ def_bool y
+
config HAVE_ARCH_EARLY_PFN_TO_NID
def_bool X86_64
depends on NUMA
Index: linux-2.6.27-rc5/arch/x86/mm/init_64.c
===================================================================
--- linux-2.6.27-rc5.orig/arch/x86/mm/init_64.c 2008-09-03 13:34:08.000000000 -0700
+++ linux-2.6.27-rc5/arch/x86/mm/init_64.c 2008-09-03 13:34:55.000000000 -0700
@@ -740,6 +740,24 @@
EXPORT_SYMBOL_GPL(memory_add_physaddr_to_nid);
#endif
+#ifdef CONFIG_MEMORY_HOTREMOVE
+int remove_memory(u64 start, u64 size)
+{
+ unsigned long start_pfn, end_pfn;
+ unsigned long timeout = 120 * HZ;
+ int ret;
+ start_pfn = start >> PAGE_SHIFT;
+ end_pfn = start_pfn + (size >> PAGE_SHIFT);
+ ret = offline_pages(start_pfn, end_pfn, timeout);
+ if (ret)
+ goto out;
+ /* Arch-specific calls go here */
+out:
+ return ret;
+}
+EXPORT_SYMBOL_GPL(remove_memory);
+#endif /* CONFIG_MEMORY_HOTREMOVE */
+
#endif /* CONFIG_MEMORY_HOTPLUG */
/*
--
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next reply other threads:[~2008-09-04 20:21 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-09-04 20:21 Gary Hade [this message]
2008-09-05 3:02 ` Yasunori Goto
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