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Subject[PATCH 2/6] f2fs: call SetPageUptodate if needed
Date
SetPageUptodate() issues memory barrier, resulting in performance degrdation.
Let's avoid that.

Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
---
fs/f2fs/checkpoint.c | 6 ++++--
fs/f2fs/data.c | 18 ++++++++++++------
fs/f2fs/file.c | 3 ++-
fs/f2fs/inline.c | 9 ++++++---
fs/f2fs/node.c | 9 ++++++---
5 files changed, 30 insertions(+), 15 deletions(-)

diff --git a/fs/f2fs/checkpoint.c b/fs/f2fs/checkpoint.c
index 2755ef7..8ea8953 100644
--- a/fs/f2fs/checkpoint.c
+++ b/fs/f2fs/checkpoint.c
@@ -48,7 +48,8 @@ repeat:
goto repeat;
}
f2fs_wait_on_page_writeback(page, META, true);
- SetPageUptodate(page);
+ if (!PageUptodate(page))
+ SetPageUptodate(page);
return page;
}

@@ -364,7 +365,8 @@ static int f2fs_set_meta_page_dirty(struct page *page)
{
trace_f2fs_set_page_dirty(page, META);

- SetPageUptodate(page);
+ if (!PageUptodate(page))
+ SetPageUptodate(page);
if (!PageDirty(page)) {
f2fs_set_page_dirty_nobuffers(page);
inc_page_count(F2FS_P_SB(page), F2FS_DIRTY_META);
diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
index 4a2e97d..b6fd5bd 100644
--- a/fs/f2fs/data.c
+++ b/fs/f2fs/data.c
@@ -47,7 +47,8 @@ static void f2fs_read_end_io(struct bio *bio)
struct page *page = bvec->bv_page;

if (!bio->bi_error) {
- SetPageUptodate(page);
+ if (!PageUptodate(page))
+ SetPageUptodate(page);
} else {
ClearPageUptodate(page);
SetPageError(page);
@@ -443,7 +444,8 @@ got_it:
*/
if (dn.data_blkaddr == NEW_ADDR) {
zero_user_segment(page, 0, PAGE_SIZE);
- SetPageUptodate(page);
+ if (!PageUptodate(page))
+ SetPageUptodate(page);
unlock_page(page);
return page;
}
@@ -554,7 +556,8 @@ struct page *get_new_data_page(struct inode *inode,

if (dn.data_blkaddr == NEW_ADDR) {
zero_user_segment(page, 0, PAGE_SIZE);
- SetPageUptodate(page);
+ if (!PageUptodate(page))
+ SetPageUptodate(page);
} else {
f2fs_put_page(page, 1);

@@ -1065,7 +1068,8 @@ got_it:
}
} else {
zero_user_segment(page, 0, PAGE_SIZE);
- SetPageUptodate(page);
+ if (!PageUptodate(page))
+ SetPageUptodate(page);
unlock_page(page);
goto next_page;
}
@@ -1659,7 +1663,8 @@ repeat:
}
}
out_update:
- SetPageUptodate(page);
+ if (!PageUptodate(page))
+ SetPageUptodate(page);
out_clear:
clear_cold_data(page);
return 0;
@@ -1813,7 +1818,8 @@ static int f2fs_set_data_page_dirty(struct page *page)

trace_f2fs_set_page_dirty(page, DATA);

- SetPageUptodate(page);
+ if (!PageUptodate(page))
+ SetPageUptodate(page);

if (f2fs_is_atomic_file(inode)) {
if (!IS_ATOMIC_WRITTEN_PAGE(page)) {
diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
index 4e220ba..952cbcf 100644
--- a/fs/f2fs/file.c
+++ b/fs/f2fs/file.c
@@ -83,7 +83,8 @@ static int f2fs_vm_page_mkwrite(struct vm_area_struct *vma,
zero_user_segment(page, offset, PAGE_SIZE);
}
set_page_dirty(page);
- SetPageUptodate(page);
+ if (!PageUptodate(page))
+ SetPageUptodate(page);

trace_f2fs_vm_page_mkwrite(page, DATA);
mapped:
diff --git a/fs/f2fs/inline.c b/fs/f2fs/inline.c
index e10e958..2cd0edc 100644
--- a/fs/f2fs/inline.c
+++ b/fs/f2fs/inline.c
@@ -59,7 +59,8 @@ void read_inline_data(struct page *page, struct page *ipage)
memcpy(dst_addr, src_addr, MAX_INLINE_DATA);
flush_dcache_page(page);
kunmap_atomic(dst_addr);
- SetPageUptodate(page);
+ if (!PageUptodate(page))
+ SetPageUptodate(page);
}

bool truncate_inline_inode(struct page *ipage, u64 from)
@@ -97,7 +98,8 @@ int f2fs_read_inline_data(struct inode *inode, struct page *page)
else
read_inline_data(page, ipage);

- SetPageUptodate(page);
+ if (!PageUptodate(page))
+ SetPageUptodate(page);
f2fs_put_page(ipage, 1);
unlock_page(page);
return 0;
@@ -370,7 +372,8 @@ static int f2fs_move_inline_dirents(struct inode *dir, struct page *ipage,
NR_INLINE_DENTRY * F2FS_SLOT_LEN);

kunmap_atomic(dentry_blk);
- SetPageUptodate(page);
+ if (!PageUptodate(page))
+ SetPageUptodate(page);
set_page_dirty(page);

/* clear inline dir and flag after data writeback */
diff --git a/fs/f2fs/node.c b/fs/f2fs/node.c
index db73f3c..ca1bb3c 100644
--- a/fs/f2fs/node.c
+++ b/fs/f2fs/node.c
@@ -1045,7 +1045,8 @@ struct page *new_node_page(struct dnode_of_data *dn,
f2fs_wait_on_page_writeback(page, NODE, true);
fill_node_footer(page, dn->nid, dn->inode->i_ino, ofs, true);
set_cold_node(dn->inode, page);
- SetPageUptodate(page);
+ if (!PageUptodate(page))
+ SetPageUptodate(page);
if (set_page_dirty(page))
dn->node_changed = true;

@@ -1644,7 +1645,8 @@ static int f2fs_set_node_page_dirty(struct page *page)
{
trace_f2fs_set_page_dirty(page, NODE);

- SetPageUptodate(page);
+ if (!PageUptodate(page))
+ SetPageUptodate(page);
if (!PageDirty(page)) {
f2fs_set_page_dirty_nobuffers(page);
inc_page_count(F2FS_P_SB(page), F2FS_DIRTY_NODES);
@@ -2015,7 +2017,8 @@ int recover_inode_page(struct f2fs_sb_info *sbi, struct page *page)
/* Should not use this inode from free nid list */
remove_free_nid(NM_I(sbi), ino);

- SetPageUptodate(ipage);
+ if (!PageUptodate(ipage))
+ SetPageUptodate(ipage);
fill_node_footer(ipage, ino, ino, 0, true);

src = F2FS_INODE(page);
--
2.8.3
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