From 55ac590c2fadad785d60dd70c12d62823bc2cd39 Mon Sep 17 00:00:00 2001 From: Tang Chen Date: Tue, 21 Jan 2014 15:49:35 -0800 Subject: memblock, mem_hotplug: make memblock skip hotpluggable regions if needed Linux kernel cannot migrate pages used by the kernel. As a result, hotpluggable memory used by the kernel won't be able to be hot-removed. To solve this problem, the basic idea is to prevent memblock from allocating hotpluggable memory for the kernel at early time, and arrange all hotpluggable memory in ACPI SRAT(System Resource Affinity Table) as ZONE_MOVABLE when initializing zones. In the previous patches, we have marked hotpluggable memory regions with MEMBLOCK_HOTPLUG flag in memblock.memory. In this patch, we make memblock skip these hotpluggable memory regions in the default top-down allocation function if movable_node boot option is specified. [akpm@linux-foundation.org: coding-style fixes] Signed-off-by: Tang Chen Signed-off-by: Zhang Yanfei Cc: "H. Peter Anvin" Cc: "Rafael J . Wysocki" Cc: Chen Tang Cc: Gong Chen Cc: Ingo Molnar Cc: Jiang Liu Cc: Johannes Weiner Cc: Lai Jiangshan Cc: Larry Woodman Cc: Len Brown Cc: Liu Jiang Cc: Mel Gorman Cc: Michal Nazarewicz Cc: Minchan Kim Cc: Prarit Bhargava Cc: Rik van Riel Cc: Taku Izumi Cc: Tejun Heo Cc: Thomas Gleixner Cc: Thomas Renninger Cc: Toshi Kani Cc: Vasilis Liaskovitis Cc: Wanpeng Li Cc: Wen Congyang Cc: Yasuaki Ishimatsu Cc: Yinghai Lu Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- mm/memory_hotplug.c | 1 + 1 file changed, 1 insertion(+) (limited to 'mm/memory_hotplug.c') diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c index 489f235502db..01e39afde1cb 100644 --- a/mm/memory_hotplug.c +++ b/mm/memory_hotplug.c @@ -1446,6 +1446,7 @@ static int __init cmdline_parse_movable_node(char *p) * the kernel away from hotpluggable memory. */ memblock_set_bottom_up(true); + movable_node_enabled = true; #else pr_warn("movable_node option not supported\n"); #endif -- cgit v1.2.2 From 869a84e1ca163b737236dae997db4a6a1e230b9b Mon Sep 17 00:00:00 2001 From: Grygorii Strashko Date: Tue, 21 Jan 2014 15:50:10 -0800 Subject: mm/memblock: remove unnecessary inclusions of bootmem.h Clean-up to remove depedency with bootmem headers. Signed-off-by: Grygorii Strashko Signed-off-by: Santosh Shilimkar Reviewed-by: Tejun Heo Cc: Yinghai Lu Cc: Arnd Bergmann Cc: Greg Kroah-Hartman Cc: "Rafael J. Wysocki" Cc: Christoph Lameter Cc: H. Peter Anvin Cc: Johannes Weiner Cc: KAMEZAWA Hiroyuki Cc: Konrad Rzeszutek Wilk Cc: Michal Hocko Cc: Paul Walmsley Cc: Pavel Machek Cc: Russell King Cc: Tony Lindgren Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- mm/memory_hotplug.c | 1 - 1 file changed, 1 deletion(-) (limited to 'mm/memory_hotplug.c') diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c index 01e39afde1cb..af4935ee444f 100644 --- a/mm/memory_hotplug.c +++ b/mm/memory_hotplug.c @@ -9,7 +9,6 @@ #include #include #include -#include #include #include #include -- cgit v1.2.2 From 9e43aa2b8d1cb3137bd7e60d5fead83d0569de2b Mon Sep 17 00:00:00 2001 From: Santosh Shilimkar Date: Tue, 21 Jan 2014 15:50:43 -0800 Subject: mm/memory_hotplug.c: use memblock apis for early memory allocations Correct ensure_zone_is_initialized() function description according to the introduced memblock APIs for early memory allocations. Signed-off-by: Grygorii Strashko Signed-off-by: Santosh Shilimkar Cc: "Rafael J. Wysocki" Cc: Arnd Bergmann Cc: Christoph Lameter Cc: Greg Kroah-Hartman Cc: H. Peter Anvin Cc: Johannes Weiner Cc: KAMEZAWA Hiroyuki Cc: Konrad Rzeszutek Wilk Cc: Michal Hocko Cc: Paul Walmsley Cc: Pavel Machek Cc: Russell King Cc: Tejun Heo Cc: Tony Lindgren Cc: Yinghai Lu Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- mm/memory_hotplug.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'mm/memory_hotplug.c') diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c index af4935ee444f..cc2ab37220b7 100644 --- a/mm/memory_hotplug.c +++ b/mm/memory_hotplug.c @@ -268,7 +268,7 @@ static void fix_zone_id(struct zone *zone, unsigned long start_pfn, } /* Can fail with -ENOMEM from allocating a wait table with vmalloc() or - * alloc_bootmem_node_nopanic() */ + * alloc_bootmem_node_nopanic()/memblock_virt_alloc_node_nopanic() */ static int __ref ensure_zone_is_initialized(struct zone *zone, unsigned long start_pfn, unsigned long num_pages) { -- cgit v1.2.2