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Message-ID: <4FEAA09F.5000907@jp.fujitsu.com>
Date: Wed, 27 Jun 2012 14:56:47 +0900
From: Yasuaki Ishimatsu <isimatu.yasuaki@...fujitsu.com>
To: <linux-mm@...ck.org>, <linux-kernel@...r.kernel.org>,
<linuxppc-dev@...ts.ozlabs.org>, <linux-acpi@...r.kernel.org>
CC: <len.brown@...el.com>, <benh@...nel.crashing.org>,
<paulus@...ba.org>, <cl@...ux.com>, <minchan.kim@...il.com>,
<akpm@...ux-foundation.org>, <kosaki.motohiro@...fujitsu.com>,
<wency@...fujitsu.com>
Subject: [RFC PATCH 10/12] memory-hotplug : free memmap of sparse-vmemmap
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: Len Brown <len.brown@...el.com>
CC: Benjamin Herrenschmidt <benh@...nel.crashing.org>
CC: Paul Mackerras <paulus@...ba.org>
CC: Christoph Lameter <cl@...ux.com>
Cc: Minchan Kim <minchan.kim@...il.com>
CC: Andrew Morton <akpm@...ux-foundation.org>
CC: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
CC: Wen Congyang <wency@...fujitsu.com>
Signed-off-by: Yasuaki Ishimatsu <isimatu.yasuaki@...fujitsu.com>
---
arch/x86/mm/init_64.c | 89 ++++++++++++++++++++++++++++++++++++++++++++++++++
include/linux/mm.h | 2 +
mm/memory_hotplug.c | 5 ++
mm/sparse.c | 5 +-
4 files changed, 99 insertions(+), 2 deletions(-)
Index: linux-3.5-rc4/include/linux/mm.h
===================================================================
--- linux-3.5-rc4.orig/include/linux/mm.h 2012-06-27 09:11:13.790150442 +0900
+++ linux-3.5-rc4/include/linux/mm.h 2012-06-27 09:11:16.433117400 +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 2012-06-27 09:06:35.317631878 +0900
+++ linux-3.5-rc4/mm/sparse.c 2012-06-27 09:11:16.434117388 +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 2012-06-27 09:11:13.791150430 +0900
+++ linux-3.5-rc4/arch/x86/mm/init_64.c 2012-06-27 09:11:59.254581998 +0900
@@ -978,6 +978,95 @@ vmemmap_populate(struct page *start_page
return 0;
}
+unsigned long find_and_clear_pte_page(unsigned long addr, unsigned long end,
+ struct page *page)
+{
+ pgd_t *pgd;
+ pud_t *pud;
+ pmd_t *pmd;
+ pte_t *pte;
+ unsigned long next;
+
+ page = NULL;
+
+ pgd = pgd_offset_k(addr);
+ if (pgd_none(*pgd))
+ return PAGE_SIZE;
+
+ pud = pud_offset(pgd, addr);
+ if (pud_none(*pud))
+ return PAGE_SIZE;
+
+ 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;
+
+ page = 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;
+
+ page = 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) {
+ next = find_and_clear_pte_page(addr, end, page);
+ if (!page)
+ continue;
+
+ if (is_vmalloc_addr(page))
+ vfree(page);
+ else {
+ order = next - addr;
+ free_pages((unsigned long)page,
+ get_order(sizeof(struct page) * 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) {
+ 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 2012-06-27 09:11:13.789150454 +0900
+++ linux-3.5-rc4/mm/memory_hotplug.c 2012-06-27 09:11:16.436117363 +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
--
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