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Message-ID: <CAE9FiQVWVzO93RM_QT-Qp+5jJUEiw=5OOD_454fCjgQ5p9-b3g@mail.gmail.com>
Date: Wed, 21 Aug 2013 22:19:52 -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 Wed, Aug 21, 2013 at 12:29 AM, Wanpeng Li <liwanp@...ux.vnet.ibm.com> wrote:
> Hi Yinghai,
> On Tue, Aug 20, 2013 at 09:28:29PM -0700, Yinghai Lu wrote:
>>On Tue, Aug 20, 2013 at 8:11 PM, Wanpeng Li <liwanp@...ux.vnet.ibm.com> wrote:
>>> Hi Yinghai,
>>> On Tue, Aug 20, 2013 at 05:02:17PM -0700, Yinghai Lu wrote:
>>>>>> - /* ok, last chunk */
>>>>>> - sparse_early_usemaps_alloc_node(usemap_map, pnum_begin, NR_MEM_SECTIONS,
>>>>>> - usemap_count, nodeid_begin);
>>>>>> + alloc_usemap_and_memmap(usemap_map, true);
>>>>
>>>>alloc_usemap_and_memmap() is somehow confusing.
>>>>
>>>>Please check if you can pass function pointer instead of true/false.
>>>>
>>>
>>> sparse_early_usemaps_alloc_node and sparse_early_mem_maps_alloc_node is
>>> similar, however, one has a parameter unsigned long ** and the other has
>>> struct page **. function pointer can't help, isn't it? ;-)
>>
>>you could have one generic function pointer like
>>void *alloc_func(void *data);
>>
>>and in the every alloc function, have own struct data to pass in/out...
>>
>>Yinghai
>
> How about this?
>From a78e12a9ff31f2a73b87145ce7ad943a0f712708 Mon Sep 17 00:00:00 2001
From: Wanpeng Li <liwanp@...ux.vnet.ibm.com>
Date: Wed, 21 Aug 2013 15:23:08 +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 | 54 +++++++++++++++++++++++++-----------------------------
1 files changed, 25 insertions(+), 29 deletions(-)
diff --git a/mm/sparse.c b/mm/sparse.c
index 55e5752..06adf3c 100644
--- a/mm/sparse.c
+++ b/mm/sparse.c
@@ -339,14 +339,16 @@ 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,
+static void __init sparse_early_usemaps_alloc_node(void **usemap_map,
unsigned long pnum_begin,
unsigned long pnum_end,
unsigned long usemap_count, int nodeid)
{
void *usemap;
unsigned long pnum;
+ unsigned long **map;
int size = usemap_size();
+ map = (unsigned long **) usemap_map;
usemap = sparse_early_usemaps_alloc_pgdat_section(NODE_DATA(nodeid),
size * usemap_count);
@@ -358,9 +360,9 @@ static void __init
sparse_early_usemaps_alloc_node(unsigned long**usemap_map,
for (pnum = pnum_begin; pnum < pnum_end; pnum++) {
if (!present_section_nr(pnum))
continue;
- usemap_map[pnum] = usemap;
+ map[pnum] = usemap;
usemap += size;
- check_usemap_section_nr(nodeid, usemap_map[pnum]);
+ check_usemap_section_nr(nodeid, map[pnum]);
}
}
@@ -430,23 +432,16 @@ 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,
+static void __init sparse_early_mem_maps_alloc_node(void **map_map,
unsigned long pnum_begin,
unsigned long pnum_end,
unsigned long map_count, int nodeid)
{
- sparse_mem_maps_populate_node(map_map, pnum_begin, pnum_end,
+ struct page **map = (struct page **)map_map;
+ sparse_mem_maps_populate_node(map, pnum_begin, pnum_end,
map_count, nodeid);
}
======> maybe you can have:
struct alloc_info {
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)
{
struct alloc_info *info = (struct alloc_info *)data;
sparse_mem_maps_populate_node(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;
@@ -471,9 +466,10 @@ 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 **, unsigned long, unsigned long,
+ unsigned long, int), void **map)
{
unsigned long pnum;
unsigned long map_count;
@@ -504,24 +500,16 @@ static void alloc_usemap_and_memmap(unsigned
long **map, bool use_map)
continue;
}
/* 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)(map, pnum_begin, pnum,
+ map_count, nodeid_begin);
========> can you use sparse_early_maps_alloc_node() ?
/* 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);
+ (*sparse_early_maps_alloc_node)(map, pnum_begin, NR_MEM_SECTIONS,
+ map_count, nodeid_begin);
}
/*
@@ -540,6 +528,10 @@ void __init sparse_init(void)
struct page **map_map;
#endif
+ void (*sparse_early_maps_alloc_node)(void **map,
+ unsigned long pnum_begin, unsigned long pnum_end,
+ unsigned long map_count, int nodeid);
+
/* see include/linux/mmzone.h 'struct mem_section' definition */
BUILD_BUG_ON(!is_power_of_2(sizeof(struct mem_section)));
@@ -561,14 +553,18 @@ 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;
why do you need to assign again?
+ alloc_usemap_and_memmap(sparse_early_maps_alloc_node,
+ (void **)usemap_map);
#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;
+ alloc_usemap_and_memmap(sparse_early_maps_alloc_node,
+ (void **)map_map);
#endif
for (pnum = 0; pnum < NR_MEM_SECTIONS; pnum++) {
--
1.7.7.6
--
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