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Date: Wed, 28 Aug 2013 19:18:29 -0700
From: Yinghai Lu <yinghai@...nel.org>
To: Wanpeng Li <liwanp@...ux.vnet.ibm.com>
Cc: Dave Hansen <dave.hansen@...ux.intel.com>,
Rik van Riel <riel@...hat.com>,
Fengguang Wu <fengguang.wu@...el.com>,
Joonsoo Kim <iamjoonsoo.kim@....com>,
Johannes Weiner <hannes@...xchg.org>,
Tejun Heo <tj@...nel.org>,
Yasuaki Ishimatsu <isimatu.yasuaki@...fujitsu.com>,
David Rientjes <rientjes@...gle.com>,
KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
Jiri Kosina <jkosina@...e.cz>, Linux MM <linux-mm@...ck.org>,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 2/4] mm/sparse: introduce alloc_usemap_and_memmap
On Thu, Aug 22, 2013 at 5:14 AM, Wanpeng Li <liwanp@...ux.vnet.ibm.com> wrote:
>From f21640b6dc15c76ac10fccada96e6b9fdce5a092 Mon Sep 17 00:00:00 2001
From: Wanpeng Li <liwanp@...ux.vnet.ibm.com>
Date: Thu, 22 Aug 2013 19:57:54 +0800
Subject: [PATCH] mm/sparse: introduce alloc_usemap_and_memmap fix
Pass function pointer to alloc_usemap_and_memmap() instead of true/false.
Signed-off-by: Wanpeng Li <liwanp@...ux.vnet.ibm.com>
---
mm/sparse.c | 78 ++++++++++++++++++++++++++++++++++---------------------------
1 file changed, 44 insertions(+), 34 deletions(-)
diff --git a/mm/sparse.c b/mm/sparse.c
index 55e5752..22a1a26 100644
--- a/mm/sparse.c
+++ b/mm/sparse.c
@@ -14,6 +14,14 @@
#include <asm/pgalloc.h>
#include <asm/pgtable.h>
+struct alloc_info {
+ unsigned long **map_map;
+ unsigned long pnum_begin;
+ unsigned long pnum_end;
+ unsigned long map_count;
+ int nodeid;
+};
+
/*
* Permanent SPARSEMEM data:
*
@@ -339,13 +347,16 @@ static void __init check_usemap_section_nr(int
nid, unsigned long *usemap)
}
#endif /* CONFIG_MEMORY_HOTREMOVE */
-static void __init sparse_early_usemaps_alloc_node(unsigned long**usemap_map,
- unsigned long pnum_begin,
- unsigned long pnum_end,
- unsigned long usemap_count, int nodeid)
+static void __init sparse_early_usemaps_alloc_node(void *data)
{
void *usemap;
unsigned long pnum;
+ struct alloc_info *info = (struct alloc_info *)data;
+ unsigned long **usemap_map = info->map_map;
+ unsigned long pnum_begin = info->pnum_begin;
+ unsigned long pnum_end = info->pnum_end;
+ unsigned long usemap_count = info->map_count;
+ int nodeid = info->nodeid;
===>
usemap_count and nodeid is only referred one time, you may omit those
two temp variables.
int size = usemap_size();
usemap = sparse_early_usemaps_alloc_pgdat_section(NODE_DATA(nodeid),
@@ -430,23 +441,13 @@ void __init sparse_mem_maps_populate_node(struct
page **map_map,
#endif /* !CONFIG_SPARSEMEM_VMEMMAP */
#ifdef CONFIG_SPARSEMEM_ALLOC_MEM_MAP_TOGETHER
-static void __init sparse_early_mem_maps_alloc_node(struct page **map_map,
- unsigned long pnum_begin,
- unsigned long pnum_end,
- unsigned long map_count, int nodeid)
+static void __init sparse_early_mem_maps_alloc_node(void *data)
{
- sparse_mem_maps_populate_node(map_map, pnum_begin, pnum_end,
- map_count, nodeid);
+ struct alloc_info *info = (struct alloc_info *)data;
+ sparse_mem_maps_populate_node((struct page **)info->map_map,
+ info->pnum_begin, info->pnum_end, info->map_count, info->nodeid);
}
#else
-
-static void __init sparse_early_mem_maps_alloc_node(struct page **map_map,
- unsigned long pnum_begin,
- unsigned long pnum_end,
- unsigned long map_count, int nodeid)
-{
-}
-
static struct page __init *sparse_early_mem_map_alloc(unsigned long pnum)
{
struct page *map;
@@ -471,14 +472,15 @@ void __attribute__((weak)) __meminit
vmemmap_populate_print_last(void)
/**
* alloc_usemap_and_memmap - memory alloction for pageblock flags and vmemmap
* @map: usemap_map for pageblock flags or mmap_map for vmemmap
- * @use_map: true if memory allocated for pageblock flags, otherwise false
*/
-static void alloc_usemap_and_memmap(unsigned long **map, bool use_map)
+static void alloc_usemap_and_memmap(void (*sparse_early_maps_alloc_node)
+ (void *data), void *data)
==> how about changing to :
+static void alloc_map(void (*alloc_fn)(void *), void *data)
{
unsigned long pnum;
unsigned long map_count;
int nodeid_begin = 0;
unsigned long pnum_begin = 0;
+ struct alloc_info *info = (struct alloc_info *)data;
for (pnum = 0; pnum < NR_MEM_SECTIONS; pnum++) {
struct mem_section *ms;
@@ -503,25 +505,24 @@ static void alloc_usemap_and_memmap(unsigned
long **map, bool use_map)
map_count++;
continue;
}
+
+ info->pnum_begin = pnum_begin;
+ info->pnum_end = pnum;
+ info->map_count = map_count;
+ info->nodeid = nodeid_begin;
/* ok, we need to take cake of from pnum_begin to pnum - 1*/
- if (use_map)
- sparse_early_usemaps_alloc_node(map, pnum_begin, pnum,
- map_count, nodeid_begin);
- else
- sparse_early_mem_maps_alloc_node((struct page **)map,
- pnum_begin, pnum, map_count, nodeid_begin);
+ sparse_early_maps_alloc_node((void *)info);
/* new start, update count etc*/
nodeid_begin = nodeid;
pnum_begin = pnum;
map_count = 1;
}
/* ok, last chunk */
- if (use_map)
- sparse_early_usemaps_alloc_node(map, pnum_begin,
- NR_MEM_SECTIONS, map_count, nodeid_begin);
- else
- sparse_early_mem_maps_alloc_node((struct page **)map,
- pnum_begin, NR_MEM_SECTIONS, map_count, nodeid_begin);
+ info->pnum_begin = pnum_begin;
+ info->pnum_end = NR_MEM_SECTIONS;
+ info->map_count = map_count;
+ info->nodeid = nodeid_begin;
+ sparse_early_maps_alloc_node((void *)info);
}
/*
@@ -535,11 +536,14 @@ void __init sparse_init(void)
unsigned long *usemap;
unsigned long **usemap_map;
int size;
+ struct alloc_info data;
#ifdef CONFIG_SPARSEMEM_ALLOC_MEM_MAP_TOGETHER
int size2;
struct page **map_map;
#endif
+ void (*sparse_early_maps_alloc_node)(void *data);
+
/* see include/linux/mmzone.h 'struct mem_section' definition */
BUILD_BUG_ON(!is_power_of_2(sizeof(struct mem_section)));
@@ -561,14 +565,20 @@ void __init sparse_init(void)
usemap_map = alloc_bootmem(size);
if (!usemap_map)
panic("can not allocate usemap_map\n");
- alloc_usemap_and_memmap(usemap_map, true);
+ sparse_early_maps_alloc_node = sparse_early_usemaps_alloc_node;
so you can not use sparse_early_usemaps_alloc_nod() directly?
+ data.map_map = usemap_map;
+ alloc_usemap_and_memmap(sparse_early_maps_alloc_node, (void *)&data);
+ usemap_map = data.map_map;
why do you need to this assign ? data.map_map value get changed?
#ifdef CONFIG_SPARSEMEM_ALLOC_MEM_MAP_TOGETHER
size2 = sizeof(struct page *) * NR_MEM_SECTIONS;
map_map = alloc_bootmem(size2);
if (!map_map)
panic("can not allocate map_map\n");
- alloc_usemap_and_memmap((unsigned long **)map_map, false);
+ sparse_early_maps_alloc_node = sparse_early_mem_maps_alloc_node;
+ data.map_map = (unsigned long **)map_map;
+ alloc_usemap_and_memmap(sparse_early_maps_alloc_node, (void *)&data);
+ map_map = (struct page **)data.map_map;
#endif
please change to function pointer to
void (*alloc_func)(void *data,
unsigned long pnum_begin,
unsigned long pnum_end,
unsigned long map_count, int nodeid)
pnum_begin, pnum_end, map_coun, nodeid, should not be in the struct.
please send patch against linus/master, so i could send back updated
version directly.
Thanks
Yinghai
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