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Date: Fri, 11 Jan 2013 11:47:59 +0100
From: Michal Hocko <mhocko@...e.cz>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: Wen Congyang <wency@...fujitsu.com>,
Yasuaki Ishimatsu <isimatu.yasuaki@...fujitsu.com>,
Tang Chen <tangchen@...fujitsu.com>,
Wu Jianguo <wujianguo@...wei.com>,
KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
Jiang Liu <jiang.liu@...wei.com>,
Kamezawa Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
Lai Jiangshan <laijs@...fujitsu.com>,
Ingo Molnar <mingo@...e.hu>,
Thomas Gleixner <tglx@...utronix.de>,
"H. Peter Anvin" <hpa@...or.com>, linux-mm@...ck.org,
LKML <linux-kernel@...r.kernel.org>
Subject: Re: mmots: memory-hotplug: implement
register_page_bootmem_info_section of sparse-vmemmap fix
On Fri 11-01-13 11:29:24, Michal Hocko wrote:
> On Fri 11-01-13 11:17:45, Michal Hocko wrote:
> [...]
> > diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
> > index be2b90c..59eddff 100644
> > --- a/mm/memory_hotplug.c
> > +++ b/mm/memory_hotplug.c
> > @@ -128,6 +128,64 @@ void __ref put_page_bootmem(struct page *page)
> >
> > }
> >
> > +void register_page_bootmem_memmap(unsigned long section_nr,
> > + struct page *start_page, unsigned long size)
> > +{
> > + unsigned long addr = (unsigned long)start_page;
> > + unsigned long end = (unsigned long)(start_page + size);
> > + unsigned long next;
> > + pgd_t *pgd;
> > + pud_t *pud;
> > + pmd_t *pmd;
> > + unsigned int nr_pages;
> > + struct page *page;
> > +
> > + for (; addr < end; addr = next) {
> > + pte_t *pte = NULL;
> > +
> > + pgd = pgd_offset_k(addr);
> > + if (pgd_none(*pgd)) {
> > + next = (addr + PAGE_SIZE) & PAGE_MASK;
> > + continue;
> > + }
> > + get_page_bootmem(section_nr, pgd_page(*pgd), MIX_SECTION_INFO);
> > +
> > + pud = pud_offset(pgd, addr);
> > + if (pud_none(*pud)) {
> > + next = (addr + PAGE_SIZE) & PAGE_MASK;
> > + continue;
> > + }
> > + get_page_bootmem(section_nr, pud_page(*pud), MIX_SECTION_INFO);
> > +
> > + if (!cpu_has_pse) {
>
> Darn! And now that I am looking at the patch closer it is too x86
> centric so this cannot be in the generic code. I will try to cook
> something better. Sorry about the noise.
It is more complicated than I thought. One would tell it's a mess.
The patch bellow fixes the compilation issue but I am not sure we want
to include memory_hotplug.h into arch/x86/mm/init_64.c. Moreover
+void register_page_bootmem_memmap(unsigned long section_nr,
+ struct page *start_page, unsigned long size)
+{
+ /* TODO */
+}
for other archs would suggest that the code is not ready yet. Should
this rather be dropped for now?
---
>From 2c79d0467132c7e236b0fdf98a7d5c43ed6640a5 Mon Sep 17 00:00:00 2001
From: Michal Hocko <mhocko@...e.cz>
Date: Fri, 11 Jan 2013 10:50:42 +0100
Subject: [PATCH] memory-hotplug-implement-register_page_bootmem_info_section-of-sparse-vmemmap.patch
fix
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
Defconfig for x86_64 complains
arch/x86/mm/init_64.c: In function ‘register_page_bootmem_memmap’:
arch/x86/mm/init_64.c:1340: error: implicit declaration of function ‘get_page_bootmem’
arch/x86/mm/init_64.c:1340: error: ‘MIX_SECTION_INFO’ undeclared (first
use in this function)
arch/x86/mm/init_64.c:1340: error: (Each undeclared identifier is
reported only once
arch/x86/mm/init_64.c:1340: error: for each function it appears in.)
arch/x86/mm/init_64.c:1361: error: ‘SECTION_INFO’ undeclared (first use in this function)
put register_page_bootmem_memmap inside CONFIG_MEMORY_HOTPLUG_SPARSE
and include memory_hotplug.h in arch/x86/mm/init_64.c
Signed-off-by: Michal Hocko <mhocko@...e.cz>
---
arch/x86/mm/init_64.c | 3 +++
include/linux/mm.h | 2 ++
2 files changed, 5 insertions(+)
diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c
index ddd3b58..d8edf52 100644
--- a/arch/x86/mm/init_64.c
+++ b/arch/x86/mm/init_64.c
@@ -32,6 +32,7 @@
#include <linux/memory_hotplug.h>
#include <linux/nmi.h>
#include <linux/gfp.h>
+#include <linux/memory_hotplug.h>
#include <asm/processor.h>
#include <asm/bios_ebda.h>
@@ -1317,6 +1318,7 @@ vmemmap_populate(struct page *start_page, unsigned long size, int node)
return 0;
}
+#ifdef CONFIG_MEMORY_HOTPLUG_SPARSE
void register_page_bootmem_memmap(unsigned long section_nr,
struct page *start_page, unsigned long size)
{
@@ -1374,6 +1376,7 @@ void register_page_bootmem_memmap(unsigned long section_nr,
}
}
}
+#endif
void __meminit vmemmap_populate_print_last(void)
{
diff --git a/include/linux/mm.h b/include/linux/mm.h
index 7c57bd0..67e0c31 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -1724,8 +1724,10 @@ void vmemmap_populate_print_last(void);
#ifdef CONFIG_MEMORY_HOTPLUG
void vmemmap_free(struct page *memmap, unsigned long nr_pages);
#endif
+#ifdef CONFIG_MEMORY_HOTPLUG_SPARSE
void register_page_bootmem_memmap(unsigned long section_nr, struct page *map,
unsigned long size);
+#endif
enum mf_flags {
MF_COUNT_INCREASED = 1 << 0,
--
1.7.10.4
--
Michal Hocko
SUSE Labs
--
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