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Subject[PATCH 01/12] revert per-backing_dev-dirty-and-writeback-page-accounting
For ease of application..

---
block/ll_rw_blk.c | 29 -----------------------------
fs/buffer.c | 1 -
include/linux/backing-dev.h | 2 --
mm/page-writeback.c | 13 ++-----------
mm/truncate.c | 1 -
5 files changed, 2 insertions(+), 44 deletions(-)

Index: linux-2.6/block/ll_rw_blk.c
===================================================================
--- linux-2.6.orig/block/ll_rw_blk.c 2007-04-10 16:30:55.000000000 +0200
+++ linux-2.6/block/ll_rw_blk.c 2007-04-10 16:35:24.000000000 +0200
@@ -201,8 +201,6 @@ EXPORT_SYMBOL(blk_queue_softirq_done);
**/
void blk_queue_make_request(request_queue_t * q, make_request_fn * mfn)
{
- struct backing_dev_info *bdi = &q->backing_dev_info;
-
/*
* set defaults
*/
@@ -210,8 +208,6 @@ void blk_queue_make_request(request_queu
blk_queue_max_phys_segments(q, MAX_PHYS_SEGMENTS);
blk_queue_max_hw_segments(q, MAX_HW_SEGMENTS);
q->make_request_fn = mfn;
- atomic_long_set(&bdi->nr_dirty, 0);
- atomic_long_set(&bdi->nr_writeback, 0);
blk_queue_max_sectors(q, SAFE_MAX_SECTORS);
blk_queue_hardsect_size(q, 512);
blk_queue_dma_alignment(q, 511);
@@ -3978,19 +3974,6 @@ static ssize_t queue_max_hw_sectors_show
return queue_var_show(max_hw_sectors_kb, (page));
}

-static ssize_t queue_nr_dirty_show(struct request_queue *q, char *page)
-{
- return sprintf(page, "%lu\n",
- atomic_long_read(&q->backing_dev_info.nr_dirty));
-
-}
-
-static ssize_t queue_nr_writeback_show(struct request_queue *q, char *page)
-{
- return sprintf(page, "%lu\n",
- atomic_long_read(&q->backing_dev_info.nr_writeback));
-
-}

static struct queue_sysfs_entry queue_requests_entry = {
.attr = {.name = "nr_requests", .mode = S_IRUGO | S_IWUSR },
@@ -4021,16 +4004,6 @@ static struct queue_sysfs_entry queue_ma
.show = queue_max_hw_sectors_show,
};

-static struct queue_sysfs_entry queue_nr_dirty_entry = {
- .attr = {.name = "nr_dirty", .mode = S_IRUGO },
- .show = queue_nr_dirty_show,
-};
-
-static struct queue_sysfs_entry queue_nr_writeback_entry = {
- .attr = {.name = "nr_writeback", .mode = S_IRUGO },
- .show = queue_nr_writeback_show,
-};
-
static struct queue_sysfs_entry queue_iosched_entry = {
.attr = {.name = "scheduler", .mode = S_IRUGO | S_IWUSR },
.show = elv_iosched_show,
@@ -4043,8 +4016,6 @@ static struct attribute *default_attrs[]
&queue_initial_ra_entry.attr,
&queue_max_hw_sectors_entry.attr,
&queue_max_sectors_entry.attr,
- &queue_nr_dirty_entry.attr,
- &queue_nr_writeback_entry.attr,
&queue_iosched_entry.attr,
NULL,
};
Index: linux-2.6/fs/buffer.c
===================================================================
--- linux-2.6.orig/fs/buffer.c 2007-04-10 16:30:15.000000000 +0200
+++ linux-2.6/fs/buffer.c 2007-04-10 16:35:03.000000000 +0200
@@ -740,7 +740,6 @@ int __set_page_dirty_buffers(struct page
if (page->mapping) { /* Race with truncate? */
if (mapping_cap_account_dirty(mapping)) {
__inc_zone_page_state(page, NR_FILE_DIRTY);
- atomic_long_inc(&mapping->backing_dev_info->nr_dirty);
task_io_account_write(PAGE_CACHE_SIZE);
}
radix_tree_tag_set(&mapping->page_tree,
Index: linux-2.6/include/linux/backing-dev.h
===================================================================
--- linux-2.6.orig/include/linux/backing-dev.h 2007-04-10 16:30:55.000000000 +0200
+++ linux-2.6/include/linux/backing-dev.h 2007-04-10 16:35:03.000000000 +0200
@@ -30,8 +30,6 @@ struct backing_dev_info {
unsigned long ra_thrash_bytes; /* estimated thrashing threshold */
unsigned long state; /* Always use atomic bitops on this */
unsigned int capabilities; /* Device capabilities */
- atomic_long_t nr_dirty; /* Pages dirty against this BDI */
- atomic_long_t nr_writeback;/* Pages under writeback against this BDI */
congested_fn *congested_fn; /* Function pointer if device is md/dm */
void *congested_data; /* Pointer to aux data for congested func */
void (*unplug_io_fn)(struct backing_dev_info *, struct page *);
Index: linux-2.6/mm/page-writeback.c
===================================================================
--- linux-2.6.orig/mm/page-writeback.c 2007-04-10 16:30:15.000000000 +0200
+++ linux-2.6/mm/page-writeback.c 2007-04-10 16:35:03.000000000 +0200
@@ -828,8 +828,6 @@ int __set_page_dirty_nobuffers(struct pa
BUG_ON(mapping2 != mapping);
if (mapping_cap_account_dirty(mapping)) {
__inc_zone_page_state(page, NR_FILE_DIRTY);
- atomic_long_inc(&mapping->backing_dev_info->
- nr_dirty);
task_io_account_write(PAGE_CACHE_SIZE);
}
radix_tree_tag_set(&mapping->page_tree,
@@ -963,7 +961,6 @@ int clear_page_dirty_for_io(struct page
*/
if (TestClearPageDirty(page)) {
dec_zone_page_state(page, NR_FILE_DIRTY);
- atomic_long_dec(&mapping->backing_dev_info->nr_dirty);
return 1;
}
return 0;
@@ -982,13 +979,10 @@ int test_clear_page_writeback(struct pag

write_lock_irqsave(&mapping->tree_lock, flags);
ret = TestClearPageWriteback(page);
- if (ret) {
+ if (ret)
radix_tree_tag_clear(&mapping->page_tree,
page_index(page),
PAGECACHE_TAG_WRITEBACK);
- atomic_long_dec(&mapping->backing_dev_info->
- nr_writeback);
- }
write_unlock_irqrestore(&mapping->tree_lock, flags);
} else {
ret = TestClearPageWriteback(page);
@@ -1008,13 +1002,10 @@ int test_set_page_writeback(struct page

write_lock_irqsave(&mapping->tree_lock, flags);
ret = TestSetPageWriteback(page);
- if (!ret) {
+ if (!ret)
radix_tree_tag_set(&mapping->page_tree,
page_index(page),
PAGECACHE_TAG_WRITEBACK);
- atomic_long_inc(&mapping->backing_dev_info->
- nr_writeback);
- }
if (!PageDirty(page))
radix_tree_tag_clear(&mapping->page_tree,
page_index(page),
Index: linux-2.6/mm/truncate.c
===================================================================
--- linux-2.6.orig/mm/truncate.c 2007-04-10 16:30:15.000000000 +0200
+++ linux-2.6/mm/truncate.c 2007-04-10 16:35:03.000000000 +0200
@@ -70,7 +70,6 @@ void cancel_dirty_page(struct page *page
if (TestClearPageDirty(page)) {
struct address_space *mapping = page->mapping;
if (mapping && mapping_cap_account_dirty(mapping)) {
- atomic_long_dec(&mapping->backing_dev_info->nr_dirty);
dec_zone_page_state(page, NR_FILE_DIRTY);
if (account_size)
task_io_account_cancelled_write(account_size);
--

-
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