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Subject[PATCH 1/3] writeback: change nr_pages_dirtied argument into local variable
Date
There is no reason nr_pages_dirtied is argument anymore.
because nr_pages_dirtied value from caller is not used in
balance_dirty_pages_ratelimited_nr function.

Signed-off-by: Namjae Jeon <linkinjeon@gmail.com>
Signed-off-by: Vivek Trivedi <vtrivedi018@gmail.com>
---
fs/btrfs/disk-io.c | 8 ++++----
fs/btrfs/file.c | 3 +--
fs/btrfs/ioctl.c | 2 +-
fs/ocfs2/file.c | 5 +----
fs/splice.c | 5 +----
include/linux/writeback.h | 9 +--------
mm/page-writeback.c | 11 +++++------
7 files changed, 14 insertions(+), 29 deletions(-)
diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index 62e0caf..10b6128 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -3344,8 +3344,8 @@ void btrfs_btree_balance_dirty(struct btrfs_root *root, unsigned long nr)
num_dirty = root->fs_info->dirty_metadata_bytes;

if (num_dirty > thresh) {
- balance_dirty_pages_ratelimited_nr(
- root->fs_info->btree_inode->i_mapping, 1);
+ balance_dirty_pages_ratelimited(
+ root->fs_info->btree_inode->i_mapping);
}
return;
}
@@ -3365,8 +3365,8 @@ void __btrfs_btree_balance_dirty(struct btrfs_root *root, unsigned long nr)
num_dirty = root->fs_info->dirty_metadata_bytes;

if (num_dirty > thresh) {
- balance_dirty_pages_ratelimited_nr(
- root->fs_info->btree_inode->i_mapping, 1);
+ balance_dirty_pages_ratelimited(
+ root->fs_info->btree_inode->i_mapping);
}
return;
}
diff --git a/fs/btrfs/file.c b/fs/btrfs/file.c
index f6b40e8..0dae684 100644
--- a/fs/btrfs/file.c
+++ b/fs/btrfs/file.c
@@ -1314,8 +1314,7 @@ static noinline ssize_t __btrfs_buffered_write(struct file *file,

cond_resched();

- balance_dirty_pages_ratelimited_nr(inode->i_mapping,
- dirty_pages);
+ balance_dirty_pages_ratelimited(inode->i_mapping);
if (dirty_pages < (root->leafsize >> PAGE_CACHE_SHIFT) + 1)
btrfs_btree_balance_dirty(root, 1);

diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index 7bb7556..df2e9fb 100644
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -1199,7 +1199,7 @@ int btrfs_defrag_file(struct inode *inode, struct file *file,
}

defrag_count += ret;
- balance_dirty_pages_ratelimited_nr(inode->i_mapping, ret);
+ balance_dirty_pages_ratelimited(inode->i_mapping);
mutex_unlock(&inode->i_mutex);

if (newer_than) {
diff --git a/fs/ocfs2/file.c b/fs/ocfs2/file.c
index 46a1f6d..a83c964 100644
--- a/fs/ocfs2/file.c
+++ b/fs/ocfs2/file.c
@@ -2515,18 +2515,15 @@ static ssize_t ocfs2_file_splice_write(struct pipe_inode_info *pipe,
ret = sd.num_spliced;

if (ret > 0) {
- unsigned long nr_pages;
int err;

- nr_pages = (ret + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
-
err = generic_write_sync(out, *ppos, ret);
if (err)
ret = err;
else
*ppos += ret;

- balance_dirty_pages_ratelimited_nr(mapping, nr_pages);
+ balance_dirty_pages_ratelimited(mapping);
}

return ret;
diff --git a/fs/splice.c b/fs/splice.c
index 41514dd..36b6c17 100644
--- a/fs/splice.c
+++ b/fs/splice.c
@@ -1024,17 +1024,14 @@ generic_file_splice_write(struct pipe_inode_info *pipe, struct file *out,
ret = sd.num_spliced;

if (ret > 0) {
- unsigned long nr_pages;
int err;

- nr_pages = (ret + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
-
err = generic_write_sync(out, *ppos, ret);
if (err)
ret = err;
else
*ppos += ret;
- balance_dirty_pages_ratelimited_nr(mapping, nr_pages);
+ balance_dirty_pages_ratelimited(mapping);
}
sb_end_write(inode->i_sb);

diff --git a/include/linux/writeback.h b/include/linux/writeback.h
index 50c3e8f..b82a83a 100644
--- a/include/linux/writeback.h
+++ b/include/linux/writeback.h
@@ -161,14 +161,7 @@ void __bdi_update_bandwidth(struct backing_dev_info *bdi,
unsigned long start_time);

void page_writeback_init(void);
-void balance_dirty_pages_ratelimited_nr(struct address_space *mapping,
- unsigned long nr_pages_dirtied);
-
-static inline void
-balance_dirty_pages_ratelimited(struct address_space *mapping)
-{
- balance_dirty_pages_ratelimited_nr(mapping, 1);
-}
+void balance_dirty_pages_ratelimited(struct address_space *mapping);

typedef int (*writepage_t)(struct page *page, struct writeback_control *wbc,
void *data);
diff --git a/mm/page-writeback.c b/mm/page-writeback.c
index 5ad5ce2..49133b6 100644
--- a/mm/page-writeback.c
+++ b/mm/page-writeback.c
@@ -1069,7 +1069,7 @@ static void bdi_update_bandwidth(struct backing_dev_info *bdi,
}

/*
- * After a task dirtied this many pages, balance_dirty_pages_ratelimited_nr()
+ * After a task dirtied this many pages, balance_dirty_pages_ratelimited()
* will look to see if it needs to start dirty throttling.
*
* If dirty_poll_interval is too low, big NUMA machines will call the expensive
@@ -1436,9 +1436,8 @@ static DEFINE_PER_CPU(int, bdp_ratelimits);
DEFINE_PER_CPU(int, dirty_throttle_leaks) = 0;

/**
- * balance_dirty_pages_ratelimited_nr - balance dirty memory state
+ * balance_dirty_pages_ratelimited - balance dirty memory state
* @mapping: address_space which was dirtied
- * @nr_pages_dirtied: number of pages which the caller has just dirtied
*
* Processes which are dirtying memory should call in here once for each page
* which was newly dirtied. The function will periodically check the system's
@@ -1449,8 +1448,7 @@ DEFINE_PER_CPU(int, dirty_throttle_leaks) = 0;
* limit we decrease the ratelimiting by a lot, to prevent individual processes
* from overshooting the limit by (ratelimit_pages) each.
*/
-void balance_dirty_pages_ratelimited_nr(struct address_space *mapping,
- unsigned long nr_pages_dirtied)
+void balance_dirty_pages_ratelimited(struct address_space *mapping)
{
struct backing_dev_info *bdi = mapping->backing_dev_info;
int ratelimit;
@@ -1484,6 +1482,7 @@ void balance_dirty_pages_ratelimited_nr(struct address_space *mapping,
*/
p = &__get_cpu_var(dirty_throttle_leaks);
if (*p > 0 && current->nr_dirtied < ratelimit) {
+ unsigned long nr_pages_dirtied;
nr_pages_dirtied = min(*p, ratelimit - current->nr_dirtied);
*p -= nr_pages_dirtied;
current->nr_dirtied += nr_pages_dirtied;
@@ -1493,7 +1492,7 @@ void balance_dirty_pages_ratelimited_nr(struct address_space *mapping,
if (unlikely(current->nr_dirtied >= ratelimit))
balance_dirty_pages(mapping, current->nr_dirtied);
}
-EXPORT_SYMBOL(balance_dirty_pages_ratelimited_nr);
+EXPORT_SYMBOL(balance_dirty_pages_ratelimited);

void throttle_vm_writeout(gfp_t gfp_mask)
{
--
1.7.9.5


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