From patchwork Tue Jul 3 06:04:11 2012 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yasuaki Ishimatsu X-Patchwork-Id: 1149171 Return-Path: X-Original-To: patchwork-linux-acpi@patchwork.kernel.org Delivered-To: patchwork-process-083081@patchwork2.kernel.org Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by patchwork2.kernel.org (Postfix) with ESMTP id CB494DFF72 for ; Tue, 3 Jul 2012 06:04:26 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933360Ab2GCGEZ (ORCPT ); Tue, 3 Jul 2012 02:04:25 -0400 Received: from fgwmail5.fujitsu.co.jp ([192.51.44.35]:37255 "EHLO fgwmail5.fujitsu.co.jp" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933208Ab2GCGEY (ORCPT ); Tue, 3 Jul 2012 02:04:24 -0400 Received: from m2.gw.fujitsu.co.jp (unknown [10.0.50.72]) by fgwmail5.fujitsu.co.jp (Postfix) with ESMTP id 280AE3EE0C0; Tue, 3 Jul 2012 15:04:24 +0900 (JST) Received: from smail (m2 [127.0.0.1]) by outgoing.m2.gw.fujitsu.co.jp (Postfix) with ESMTP id 0F05045DE52; Tue, 3 Jul 2012 15:04:24 +0900 (JST) Received: from s2.gw.fujitsu.co.jp (s2.gw.fujitsu.co.jp [10.0.50.92]) by m2.gw.fujitsu.co.jp (Postfix) with ESMTP id EBAD845DE4E; Tue, 3 Jul 2012 15:04:23 +0900 (JST) Received: from s2.gw.fujitsu.co.jp (localhost.localdomain [127.0.0.1]) by s2.gw.fujitsu.co.jp (Postfix) with ESMTP id DF62D1DB803E; Tue, 3 Jul 2012 15:04:23 +0900 (JST) Received: from g01jpexchyt01.g01.fujitsu.local (g01jpexchyt01.g01.fujitsu.local [10.128.194.40]) by s2.gw.fujitsu.co.jp (Postfix) with ESMTP id 8ADAB1DB803A; Tue, 3 Jul 2012 15:04:23 +0900 (JST) Received: from [127.0.0.1] (10.124.101.33) by g01jpexchyt01.g01.fujitsu.local (10.128.194.40) with Microsoft SMTP Server id 14.2.309.2; Tue, 3 Jul 2012 15:04:19 +0900 X-SecurityPolicyCheck: OK by SHieldMailChecker v1.7.4 Message-ID: <4FF28B5B.6090904@jp.fujitsu.com> Date: Tue, 3 Jul 2012 15:04:11 +0900 From: Yasuaki Ishimatsu User-Agent: Mozilla/5.0 (Windows NT 5.1; rv:13.0) Gecko/20120614 Thunderbird/13.0.1 MIME-Version: 1.0 To: , , , CC: , , , , , , , , Subject: [RFC PATCH v2 11/13] memory-hotplug : free memmap of sparse-vmemmap References: <4FF287C3.4030901@jp.fujitsu.com> In-Reply-To: <4FF287C3.4030901@jp.fujitsu.com> Sender: linux-acpi-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-acpi@vger.kernel.org I don't think that all pages of virtual mapping in removed memory can be freed, since page which type is MIX_SECTION_INFO is difficult to free. So, the patch only frees page which type is SECTION_INFO at first. CC: David Rientjes CC: Jiang Liu CC: Len Brown CC: Benjamin Herrenschmidt CC: Paul Mackerras CC: Christoph Lameter Cc: Minchan Kim CC: Andrew Morton CC: KOSAKI Motohiro Signed-off-by: Yasuaki Ishimatsu --- arch/x86/mm/init_64.c | 91 ++++++++++++++++++++++++++++++++++++++++++++++++++ include/linux/mm.h | 2 + mm/memory_hotplug.c | 5 ++ mm/sparse.c | 5 +- 4 files changed, 101 insertions(+), 2 deletions(-) -- To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Index: linux-3.5-rc4/include/linux/mm.h =================================================================== --- linux-3.5-rc4.orig/include/linux/mm.h 2012-07-03 14:22:18.530011567 +0900 +++ linux-3.5-rc4/include/linux/mm.h 2012-07-03 14:22:20.999983872 +0900 @@ -1588,6 +1588,8 @@ int vmemmap_populate(struct page *start_ void vmemmap_populate_print_last(void); void register_page_bootmem_memmap(unsigned long section_nr, struct page *map, unsigned long size); +void vmemmap_kfree(struct page *memmpa, unsigned long nr_pages); +void vmemmap_free_bootmem(struct page *memmpa, unsigned long nr_pages); enum mf_flags { MF_COUNT_INCREASED = 1 << 0, Index: linux-3.5-rc4/mm/sparse.c =================================================================== --- linux-3.5-rc4.orig/mm/sparse.c 2012-07-03 14:21:45.071429805 +0900 +++ linux-3.5-rc4/mm/sparse.c 2012-07-03 14:22:21.000983767 +0900 @@ -614,12 +614,13 @@ static inline struct page *kmalloc_secti /* This will make the necessary allocations eventually. */ return sparse_mem_map_populate(pnum, nid); } -static void __kfree_section_memmap(struct page *memmap, unsigned long nr_pages) +static void __kfree_section_memmap(struct page *page, unsigned long nr_pages) { - return; /* XXX: Not implemented yet */ + vmemmap_kfree(page, nr_pages); } static void free_map_bootmem(struct page *page, unsigned long nr_pages) { + vmemmap_free_bootmem(page, nr_pages); } #else static struct page *__kmalloc_section_memmap(unsigned long nr_pages) Index: linux-3.5-rc4/arch/x86/mm/init_64.c =================================================================== --- linux-3.5-rc4.orig/arch/x86/mm/init_64.c 2012-07-03 14:22:18.538011465 +0900 +++ linux-3.5-rc4/arch/x86/mm/init_64.c 2012-07-03 14:22:21.007983103 +0900 @@ -978,6 +978,97 @@ vmemmap_populate(struct page *start_page return 0; } +unsigned long find_and_clear_pte_page(unsigned long addr, unsigned long end, + struct page **pp) +{ + pgd_t *pgd; + pud_t *pud; + pmd_t *pmd; + pte_t *pte; + unsigned long next; + + *pp = NULL; + + pgd = pgd_offset_k(addr); + if (pgd_none(*pgd)) + return (addr + PAGE_SIZE) & PAGE_MASK; + + pud = pud_offset(pgd, addr); + if (pud_none(*pud)) + return (addr + PAGE_SIZE) & PAGE_MASK; + + if (!cpu_has_pse) { + next = (addr + PAGE_SIZE) & PAGE_MASK; + pmd = pmd_offset(pud, addr); + if (pmd_none(*pmd)) + return next; + + pte = pte_offset_kernel(pmd, addr); + if (pte_none(*pte)) + return next; + + *pp = pte_page(*pte); + pte_clear(&init_mm, addr, pte); + } else { + next = pmd_addr_end(addr, end); + + pmd = pmd_offset(pud, addr); + if (pmd_none(*pmd)) + return next; + + *pp = pmd_page(*pmd); + pmd_clear(pmd); + } + + return next; +} + +void __meminit +vmemmap_kfree(struct page *memmap, unsigned long nr_pages) +{ + unsigned long addr = (unsigned long)memmap; + unsigned long end = (unsigned long)(memmap + nr_pages); + unsigned long next; + unsigned int order; + struct page *page; + + for (; addr < end; addr = next) { + page = NULL; + next = find_and_clear_pte_page(addr, end, &page); + if (!page) + continue; + + if (is_vmalloc_addr(page_address(page))) + vfree(page_address(page)); + else { + order = next - addr; + free_pages((unsigned long)page_address(page), + get_order(order)); + } + } +} + +void __meminit +vmemmap_free_bootmem(struct page *memmap, unsigned long nr_pages) +{ + unsigned long addr = (unsigned long)memmap; + unsigned long end = (unsigned long)(memmap + nr_pages); + unsigned long next; + struct page *page; + unsigned long magic; + + for (; addr < end; addr = next) { + page = NULL; + next = find_and_clear_pte_page(addr, end, &page); + if (!page) + continue; + + magic = (unsigned long) page->lru.next; + if (magic == SECTION_INFO) + put_page_bootmem(page); + } +} + void __meminit register_page_bootmem_memmap(unsigned long section_nr, struct page *start_page, unsigned long size) Index: linux-3.5-rc4/mm/memory_hotplug.c =================================================================== --- linux-3.5-rc4.orig/mm/memory_hotplug.c 2012-07-03 14:22:18.522011667 +0900 +++ linux-3.5-rc4/mm/memory_hotplug.c 2012-07-03 14:22:21.012982694 +0900 @@ -303,6 +303,8 @@ static int __meminit __add_section(int n #ifdef CONFIG_SPARSEMEM_VMEMMAP static int __remove_section(struct zone *zone, struct mem_section *ms) { + unsigned long flags; + struct pglist_data *pgdat = zone->zone_pgdat; int ret; if (!valid_section(ms)) @@ -310,6 +312,9 @@ static int __remove_section(struct zone ret = unregister_memory_section(ms); + pgdat_resize_lock(pgdat, &flags); + sparse_remove_one_section(zone, ms); + pgdat_resize_unlock(pgdat, &flags); return ret; } #else