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Subject[RFC] memory hotremove patch take 2 [01/10] (counter of removable page)
Show #of Movable pages and vmstat.

Signed-Off-By: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Signed-off-by: Yasunori Goto <y-goto@jp.fujitsu.com>

arch/ia64/mm/init.c | 2 ++
drivers/base/node.c | 4 ++++
fs/proc/proc_misc.c | 4 ++++
include/linux/kernel.h | 2 ++
include/linux/swap.h | 1 +
mm/page_alloc.c | 22 ++++++++++++++++++++++
6 files changed, 35 insertions(+)

Index: current_test/mm/page_alloc.c
===================================================================
--- current_test.orig/mm/page_alloc.c 2007-05-08 15:06:50.000000000 +0900
+++ current_test/mm/page_alloc.c 2007-05-08 15:08:36.000000000 +0900
@@ -58,6 +58,7 @@ unsigned long totalram_pages __read_most
unsigned long totalreserve_pages __read_mostly;
long nr_swap_pages;
int percpu_pagelist_fraction;
+unsigned long total_movable_pages __read_mostly;

static void __free_pages_ok(struct page *page, unsigned int order);

@@ -1827,6 +1828,18 @@ static unsigned int nr_free_zone_pages(i
return sum;
}

+unsigned int nr_free_movable_pages(void)
+{
+ unsigned long nr_pages = 0;
+ struct zone *zone;
+ int nid;
+
+ for_each_online_node(nid) {
+ zone = &(NODE_DATA(nid)->node_zones[ZONE_MOVABLE]);
+ nr_pages += zone_page_state(zone, NR_FREE_PAGES);
+ }
+ return nr_pages;
+}
/*
* Amount of free RAM allocatable within ZONE_DMA and ZONE_NORMAL
*/
@@ -1889,6 +1902,8 @@ void si_meminfo(struct sysinfo *val)
val->totalhigh = totalhigh_pages;
val->freehigh = nr_free_highpages();
val->mem_unit = PAGE_SIZE;
+ val->movable = total_movable_pages;
+ val->free_movable = nr_free_movable_pages();
}

EXPORT_SYMBOL(si_meminfo);
@@ -1908,6 +1923,11 @@ void si_meminfo_node(struct sysinfo *val
val->totalhigh = 0;
val->freehigh = 0;
#endif
+
+ val->movable = pgdat->node_zones[ZONE_MOVABLE].present_pages;
+ val->free_movable = zone_page_state(&pgdat->node_zones[ZONE_MOVABLE],
+ NR_FREE_PAGES);
+
val->mem_unit = PAGE_SIZE;
}
#endif
@@ -3216,6 +3236,8 @@ static void __meminit free_area_init_cor

zone->spanned_pages = size;
zone->present_pages = realsize;
+ if (j == ZONE_MOVABLE)
+ total_movable_pages += realsize;
#ifdef CONFIG_NUMA
zone->node = nid;
zone->min_unmapped_pages = (realsize*sysctl_min_unmapped_ratio)
Index: current_test/include/linux/kernel.h
===================================================================
--- current_test.orig/include/linux/kernel.h 2007-05-08 15:06:49.000000000 +0900
+++ current_test/include/linux/kernel.h 2007-05-08 15:07:20.000000000 +0900
@@ -352,6 +352,8 @@ struct sysinfo {
unsigned short pad; /* explicit padding for m68k */
unsigned long totalhigh; /* Total high memory size */
unsigned long freehigh; /* Available high memory size */
+ unsigned long movable; /* pages used only for data */
+ unsigned long free_movable; /* Avaiable pages in movable */
unsigned int mem_unit; /* Memory unit size in bytes */
char _f[20-2*sizeof(long)-sizeof(int)]; /* Padding: libc5 uses this.. */
};
Index: current_test/fs/proc/proc_misc.c
===================================================================
--- current_test.orig/fs/proc/proc_misc.c 2007-05-08 15:06:48.000000000 +0900
+++ current_test/fs/proc/proc_misc.c 2007-05-08 15:07:20.000000000 +0900
@@ -161,6 +161,8 @@ static int meminfo_read_proc(char *page,
"LowTotal: %8lu kB\n"
"LowFree: %8lu kB\n"
#endif
+ "MovableTotal: %8lu kB\n"
+ "MovableFree: %8lu kB\n"
"SwapTotal: %8lu kB\n"
"SwapFree: %8lu kB\n"
"Dirty: %8lu kB\n"
@@ -191,6 +193,8 @@ static int meminfo_read_proc(char *page,
K(i.totalram-i.totalhigh),
K(i.freeram-i.freehigh),
#endif
+ K(i.movable),
+ K(i.free_movable),
K(i.totalswap),
K(i.freeswap),
K(global_page_state(NR_FILE_DIRTY)),
Index: current_test/drivers/base/node.c
===================================================================
--- current_test.orig/drivers/base/node.c 2007-05-08 15:06:10.000000000 +0900
+++ current_test/drivers/base/node.c 2007-05-08 15:07:20.000000000 +0900
@@ -55,6 +55,8 @@ static ssize_t node_read_meminfo(struct
"Node %d LowTotal: %8lu kB\n"
"Node %d LowFree: %8lu kB\n"
#endif
+ "Node %d MovableTotal: %8lu kB\n"
+ "Node %d MovableFree: %8lu kB\n"
"Node %d Dirty: %8lu kB\n"
"Node %d Writeback: %8lu kB\n"
"Node %d FilePages: %8lu kB\n"
@@ -77,6 +79,8 @@ static ssize_t node_read_meminfo(struct
nid, K(i.totalram - i.totalhigh),
nid, K(i.freeram - i.freehigh),
#endif
+ nid, K(i.movable),
+ nid, K(i.free_movable),
nid, K(node_page_state(nid, NR_FILE_DIRTY)),
nid, K(node_page_state(nid, NR_WRITEBACK)),
nid, K(node_page_state(nid, NR_FILE_PAGES)),
Index: current_test/arch/ia64/mm/init.c
===================================================================
--- current_test.orig/arch/ia64/mm/init.c 2007-05-08 15:06:38.000000000 +0900
+++ current_test/arch/ia64/mm/init.c 2007-05-08 15:08:29.000000000 +0900
@@ -700,6 +700,8 @@ void online_page(struct page *page)
__free_page(page);
totalram_pages++;
num_physpages++;
+ if (page_zonenum(page) == ZONE_MOVABLE)
+ total_movable_pages++;
}

int arch_add_memory(int nid, u64 start, u64 size)
Index: current_test/include/linux/swap.h
===================================================================
--- current_test.orig/include/linux/swap.h 2007-05-08 15:06:49.000000000 +0900
+++ current_test/include/linux/swap.h 2007-05-08 15:07:20.000000000 +0900
@@ -169,6 +169,7 @@ extern void swapin_readahead(swp_entry_t
/* linux/mm/page_alloc.c */
extern unsigned long totalram_pages;
extern unsigned long totalreserve_pages;
+extern unsigned long total_movable_pages;
extern long nr_swap_pages;
extern unsigned int nr_free_buffer_pages(void);
extern unsigned int nr_free_pagecache_pages(void);
--
Yasunori Goto


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