f2fs: cache: introduce tracepoints

This patch introduces ftrace tracepoints to observe and profile metadata
cache operations:
- trace_f2fs_cache_set_dirty to trace marking a cached block dirty
- trace_f2fs_write_cache to trace single block writeback submission
- trace_f2fs_write_caches to tracesbatch writeback and sync sessions

Reviewed-by: Zhiguo Niu <zhiguo.niu@unisoc.com>
Signed-off-by: Chao Yu <chao@kernel.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

1 files changed, 71 insertions, 0 deletions

diff --git a/include/trace/events/f2fs.h b/include/trace/events/f2fs.h
index d53be932df01..df4cd346ae72 100644
--- a/include/trace/events/f2fs.h
+++ b/include/trace/events/f2fs.h
@@ -1430,6 +1430,50 @@ DEFINE_EVENT(f2fs__folio, f2fs_set_page_dirty,
 	TP_ARGS(folio, type)
 );
 
+DECLARE_EVENT_CLASS(f2fs__cached_block,
+
+	TP_PROTO(struct f2fs_cached_block *block, int type),
+
+	TP_ARGS(block, type),
+
+	TP_STRUCT__entry(
+		__field(dev_t,	dev)
+		__field(pgoff_t, index)
+		__field(int,	type)
+		__field(int,	dirty)
+		__field(int,	uptodate)
+	),
+
+	TP_fast_assign(
+		__entry->dev	= block->cache->sbi->sb->s_dev;
+		__entry->index	= block->index;
+		__entry->type	= type;
+		__entry->dirty	= f2fs_cache_test_dirty(block);
+		__entry->uptodate = f2fs_cache_test_uptodate(block);
+	),
+
+	TP_printk("dev = (%d,%d), %s, index = %lu, dirty = %d, uptodate = %d",
+		show_dev(__entry->dev),
+		show_block_type(__entry->type),
+		(unsigned long)__entry->index,
+		__entry->dirty,
+		__entry->uptodate)
+);
+
+DEFINE_EVENT(f2fs__cached_block, f2fs_write_cache,
+
+	TP_PROTO(struct f2fs_cached_block *block, int type),
+
+	TP_ARGS(block, type)
+);
+
+DEFINE_EVENT(f2fs__cached_block, f2fs_cache_set_dirty,
+
+	TP_PROTO(struct f2fs_cached_block *block, int type),
+
+	TP_ARGS(block, type)
+);
+
 TRACE_EVENT(f2fs_replace_atomic_write_block,
 
 	TP_PROTO(struct inode *inode, struct inode *cow_inode, pgoff_t index,
@@ -1574,6 +1618,33 @@ TRACE_EVENT(f2fs_writepages,
 		__entry->for_sync)
 );
 
+TRACE_EVENT(f2fs_write_caches,
+
+	TP_PROTO(struct f2fs_sb_info *sbi, long nr_to_write, long nwritten, int type),
+
+	TP_ARGS(sbi, nr_to_write, nwritten, type),
+
+	TP_STRUCT__entry(
+		__field(dev_t,	dev)
+		__field(long,	nr_to_write)
+		__field(long,	nwritten)
+		__field(int,	type)
+	),
+
+	TP_fast_assign(
+		__entry->dev		= sbi->sb->s_dev;
+		__entry->nr_to_write	= nr_to_write;
+		__entry->nwritten	= nwritten;
+		__entry->type		= type;
+	),
+
+	TP_printk("dev = (%d,%d), %s, nr_to_write = %ld, nwritten = %ld",
+		show_dev(__entry->dev),
+		show_block_type(__entry->type),
+		__entry->nr_to_write,
+		__entry->nwritten)
+);
+
 TRACE_EVENT(f2fs_readpages,
 
 	TP_PROTO(struct inode *inode, pgoff_t start, unsigned int nrpage),