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Subject[PATCH 13/14] Conversion of nr_bounce to per zone counter
Conversion of nr_bounce to a per zone counter

nr_bounce is only used for proc output. So it could be left as an eventcounter.
However, the eventcounters are not accurate and nr_bounce is categorizing one
type of page in a zone. So we really need this to also be a per zone counter.

Signed-off-by: Christoph Lameter <clameter@sgi.com>

Index: linux-2.6.17-rc6-mm1/include/linux/mmzone.h
===================================================================
--- linux-2.6.17-rc6-mm1.orig/include/linux/mmzone.h 2006-06-08 14:57:31.889341062 -0700
+++ linux-2.6.17-rc6-mm1/include/linux/mmzone.h 2006-06-08 15:01:43.192115178 -0700
@@ -55,6 +55,7 @@ enum zone_stat_item {
NR_DIRTY,
NR_WRITEBACK,
NR_UNSTABLE, /* NFS unstable pages */
+ NR_BOUNCE,
NR_STAT_ITEMS };

#ifdef CONFIG_SMP
Index: linux-2.6.17-rc6-mm1/include/linux/page-flags.h
===================================================================
--- linux-2.6.17-rc6-mm1.orig/include/linux/page-flags.h 2006-06-08 14:58:56.228837442 -0700
+++ linux-2.6.17-rc6-mm1/include/linux/page-flags.h 2006-06-08 15:01:43.193091680 -0700
@@ -168,7 +168,6 @@ struct page_state {
unsigned long allocstall; /* direct reclaim calls */

unsigned long pgrotated; /* pages rotated to tail of the LRU */
- unsigned long nr_bounce; /* pages for bounce buffers */
};

extern void get_full_page_state(struct page_state *ret);
Index: linux-2.6.17-rc6-mm1/mm/highmem.c
===================================================================
--- linux-2.6.17-rc6-mm1.orig/mm/highmem.c 2006-06-05 17:57:02.000000000 -0700
+++ linux-2.6.17-rc6-mm1/mm/highmem.c 2006-06-08 15:01:43.194068182 -0700
@@ -316,7 +316,7 @@ static void bounce_end_io(struct bio *bi
continue;

mempool_free(bvec->bv_page, pool);
- dec_page_state(nr_bounce);
+ dec_zone_page_state(bvec->bv_page, NR_BOUNCE);
}

bio_endio(bio_orig, bio_orig->bi_size, err);
@@ -397,7 +397,7 @@ static void __blk_queue_bounce(request_q
to->bv_page = mempool_alloc(pool, q->bounce_gfp);
to->bv_len = from->bv_len;
to->bv_offset = from->bv_offset;
- inc_page_state(nr_bounce);
+ inc_zone_page_state(to->bv_page, NR_BOUNCE);

if (rw == WRITE) {
char *vto, *vfrom;
Index: linux-2.6.17-rc6-mm1/mm/page_alloc.c
===================================================================
--- linux-2.6.17-rc6-mm1.orig/mm/page_alloc.c 2006-06-08 14:58:56.232743450 -0700
+++ linux-2.6.17-rc6-mm1/mm/page_alloc.c 2006-06-08 15:02:13.761508395 -0700
@@ -630,7 +630,7 @@ static int rmqueue_bulk(struct zone *zon

char *vm_stat_item_descr[NR_STAT_ITEMS] = {
"mapped", "pagecache", "slab", "pagetable", "dirty", "writeback",
- "unstable"
+ "unstable", "bounce"
};

/*
@@ -2788,6 +2788,7 @@ static char *vmstat_text[] = {
"nr_dirty",
"nr_writeback",
"nr_unstable",
+ "nr_bounce",

/* Page state */
"pgpgin",
@@ -2834,8 +2835,7 @@ static char *vmstat_text[] = {
"pageoutrun",
"allocstall",

- "pgrotated",
- "nr_bounce",
+ "pgrotated"
};

static void *vmstat_start(struct seq_file *m, loff_t *pos)
Index: linux-2.6.17-rc6-mm1/drivers/base/node.c
===================================================================
--- linux-2.6.17-rc6-mm1.orig/drivers/base/node.c 2006-06-08 14:58:56.229813944 -0700
+++ linux-2.6.17-rc6-mm1/drivers/base/node.c 2006-06-08 15:01:43.196997687 -0700
@@ -67,7 +67,8 @@ static ssize_t node_read_meminfo(struct
"Node %d Unstable: %8lu kB\n"
"Node %d Mapped: %8lu kB\n"
"Node %d Pagecache: %8lu kB\n"
- "Node %d Slab: %8lu kB\n",
+ "Node %d Slab: %8lu kB\n"
+ "Node %d Bounce: %8lu kB\n",
nid, K(i.totalram),
nid, K(i.freeram),
nid, K(i.totalram - i.freeram),
@@ -82,7 +83,8 @@ static ssize_t node_read_meminfo(struct
nid, K(nr[NR_UNSTABLE]),
nid, K(nr[NR_MAPPED]),
nid, K(nr[NR_PAGECACHE]),
- nid, K(nr[NR_SLAB]));
+ nid, K(nr[NR_SLAB]),
+ nid, K(nr[NR_BOUNCE]));
n += hugetlb_report_node_meminfo(nid, buf + n);
return n;
}
-
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