* [f2fs-dev] [PATCH RFC] f2fs: sync node page without cp_rwsem during block_operations()
@ 2022-02-08 10:51 ` Chao Yu
0 siblings, 0 replies; 2+ messages in thread
From: Chao Yu @ 2022-02-08 10:51 UTC (permalink / raw)
To: jaegeuk; +Cc: linux-kernel, linux-f2fs-devel
Let's avoid holding cp_rwsem write lock during f2fs_sync_node_pages()
in block_operations(), then cp_rwsem write lock's coverage in checkpoint
can be shrunk, then it expects there will be more opportunity that
foreground operator can grab cp_rwsem read lock.
Signed-off-by: Chao Yu <chao@kernel.org>
---
fs/f2fs/checkpoint.c | 16 ++++++++++++++--
1 file changed, 14 insertions(+), 2 deletions(-)
diff --git a/fs/f2fs/checkpoint.c b/fs/f2fs/checkpoint.c
index f7cb4277de70..7596faa0be45 100644
--- a/fs/f2fs/checkpoint.c
+++ b/fs/f2fs/checkpoint.c
@@ -1190,6 +1190,8 @@ static int block_operations(struct f2fs_sb_info *sbi)
.for_reclaim = 0,
};
int err = 0, cnt = 0;
+ bool sync_lockless = true;
+ unsigned int retry_cnt = 3;
/*
* Let's flush inline_data in dirty node pages.
@@ -1249,15 +1251,25 @@ static int block_operations(struct f2fs_sb_info *sbi)
if (get_pages(sbi, F2FS_DIRTY_NODES)) {
f2fs_up_write(&sbi->node_write);
+ if (!retry_cnt--)
+ sync_lockless = false;
+ if (sync_lockless) {
+ f2fs_up_write(&sbi->node_change);
+ f2fs_unlock_all(sbi);
+ }
atomic_inc(&sbi->wb_sync_req[NODE]);
err = f2fs_sync_node_pages(sbi, &wbc, false, FS_CP_NODE_IO);
atomic_dec(&sbi->wb_sync_req[NODE]);
if (err) {
- f2fs_up_write(&sbi->node_change);
- f2fs_unlock_all(sbi);
+ if (!sync_lockless) {
+ f2fs_up_write(&sbi->node_change);
+ f2fs_unlock_all(sbi);
+ }
return err;
}
cond_resched();
+ if (sync_lockless)
+ goto retry_flush_quotas;
goto retry_flush_nodes;
}
--
2.25.1
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^ permalink raw reply related [flat|nested] 2+ messages in thread
* [PATCH RFC] f2fs: sync node page without cp_rwsem during block_operations()
@ 2022-02-08 10:51 ` Chao Yu
0 siblings, 0 replies; 2+ messages in thread
From: Chao Yu @ 2022-02-08 10:51 UTC (permalink / raw)
To: jaegeuk; +Cc: linux-f2fs-devel, linux-kernel, Chao Yu
Let's avoid holding cp_rwsem write lock during f2fs_sync_node_pages()
in block_operations(), then cp_rwsem write lock's coverage in checkpoint
can be shrunk, then it expects there will be more opportunity that
foreground operator can grab cp_rwsem read lock.
Signed-off-by: Chao Yu <chao@kernel.org>
---
fs/f2fs/checkpoint.c | 16 ++++++++++++++--
1 file changed, 14 insertions(+), 2 deletions(-)
diff --git a/fs/f2fs/checkpoint.c b/fs/f2fs/checkpoint.c
index f7cb4277de70..7596faa0be45 100644
--- a/fs/f2fs/checkpoint.c
+++ b/fs/f2fs/checkpoint.c
@@ -1190,6 +1190,8 @@ static int block_operations(struct f2fs_sb_info *sbi)
.for_reclaim = 0,
};
int err = 0, cnt = 0;
+ bool sync_lockless = true;
+ unsigned int retry_cnt = 3;
/*
* Let's flush inline_data in dirty node pages.
@@ -1249,15 +1251,25 @@ static int block_operations(struct f2fs_sb_info *sbi)
if (get_pages(sbi, F2FS_DIRTY_NODES)) {
f2fs_up_write(&sbi->node_write);
+ if (!retry_cnt--)
+ sync_lockless = false;
+ if (sync_lockless) {
+ f2fs_up_write(&sbi->node_change);
+ f2fs_unlock_all(sbi);
+ }
atomic_inc(&sbi->wb_sync_req[NODE]);
err = f2fs_sync_node_pages(sbi, &wbc, false, FS_CP_NODE_IO);
atomic_dec(&sbi->wb_sync_req[NODE]);
if (err) {
- f2fs_up_write(&sbi->node_change);
- f2fs_unlock_all(sbi);
+ if (!sync_lockless) {
+ f2fs_up_write(&sbi->node_change);
+ f2fs_unlock_all(sbi);
+ }
return err;
}
cond_resched();
+ if (sync_lockless)
+ goto retry_flush_quotas;
goto retry_flush_nodes;
}
--
2.25.1
^ permalink raw reply related [flat|nested] 2+ messages in thread
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2022-02-08 10:51 [f2fs-dev] [PATCH RFC] f2fs: sync node page without cp_rwsem during block_operations() Chao Yu
2022-02-08 10:51 ` Chao Yu
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