From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-wg0-f49.google.com (mail-wg0-f49.google.com [74.125.82.49]) by kanga.kvack.org (Postfix) with ESMTP id 46B666B0037 for ; Sun, 17 Aug 2014 22:04:23 -0400 (EDT) Received: by mail-wg0-f49.google.com with SMTP id k14so4302694wgh.8 for ; Sun, 17 Aug 2014 19:04:22 -0700 (PDT) Received: from szxga03-in.huawei.com (szxga03-in.huawei.com. [119.145.14.66]) by mx.google.com with ESMTPS id wf7si23042159wjb.74.2014.08.17.19.04.20 for (version=TLSv1 cipher=RC4-SHA bits=128/128); Sun, 17 Aug 2014 19:04:22 -0700 (PDT) Message-ID: <53F15E37.9080602@huawei.com> Date: Mon, 18 Aug 2014 10:00:23 +0800 From: Xishi Qiu MIME-Version: 1.0 Subject: [PATCH V2] mem-hotplug: let memblock skip the hotpluggable memory regions in __next_mem_range() Content-Type: text/plain; charset="ISO-8859-1" Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org List-ID: To: Tejun Heo , Andrew Morton , Tang Chen , Zhang Yanfei , Wen Congyang , "Rafael J. Wysocki" , "H. Peter Anvin" Cc: Linux MM , LKML Let memblock skip the hotpluggable memory regions in __next_mem_range(), it is used to to prevent memblock from allocating hotpluggable memory for the kernel at early time. The code is the same as __next_mem_range_rev(). Clear hotpluggable flag before releasing free pages to the buddy allocator. If we don't clear hotpluggable flag in free_low_memory_core_early(), the memory which marked hotpluggable flag will not free to buddy allocator. Because __next_mem_range() will skip them. free_low_memory_core_early for_each_free_mem_range for_each_mem_range __next_mem_range Signed-off-by: Xishi Qiu --- mm/memblock.c | 4 ++++ mm/nobootmem.c | 2 ++ 2 files changed, 6 insertions(+), 0 deletions(-) diff --git a/mm/memblock.c b/mm/memblock.c index 6d2f219..5090050 100644 --- a/mm/memblock.c +++ b/mm/memblock.c @@ -817,6 +817,10 @@ void __init_memblock __next_mem_range(u64 *idx, int nid, if (nid != NUMA_NO_NODE && nid != m_nid) continue; + /* skip hotpluggable memory regions if needed */ + if (movable_node_is_enabled() && memblock_is_hotpluggable(m)) + continue; + if (!type_b) { if (out_start) *out_start = m_start; diff --git a/mm/nobootmem.c b/mm/nobootmem.c index 7ed5860..03de286 100644 --- a/mm/nobootmem.c +++ b/mm/nobootmem.c @@ -119,6 +119,8 @@ static unsigned long __init free_low_memory_core_early(void) phys_addr_t start, end; u64 i; + memblock_clear_hotplug(0, ULLONG_MAX); + for_each_free_mem_range(i, NUMA_NO_NODE, &start, &end, NULL) count += __free_memory_core(start, end); -- 1.7.1 . -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org