[PATCH v2 12/12] f2fs: cache: show per-cache usage in debugfs

[Chao Yu <chao@kernel.org>]

This patch exposes per-cache memory usage (entry struct memory vs.
cached block buffer memory) for meta, node, and compress caches under
the memory section in debugfs:
  - meta entry: xxx KB, meta cache: xxx KB
  - node entry: xxx KB, node cache: xxx KB
  - compress entry: xxx KB, compress cache: xxx KB

Signed-off-by: Chao Yu <chao@kernel.org>
---
 fs/f2fs/cache.h |  1 +
 fs/f2fs/debug.c | 49 ++++++++++++++++++++++++++++++++++++++++---------
 fs/f2fs/f2fs.h  |  2 ++
 3 files changed, 43 insertions(+), 9 deletions(-)

diff --git a/fs/f2fs/cache.h b/fs/f2fs/cache.h
index b66dbaefee2f..191cbd4b478a 100644
--- a/fs/f2fs/cache.h
+++ b/fs/f2fs/cache.h
@@ -38,6 +38,7 @@ enum f2fs_cache_type {
 	F2FS_META_CACHE,
 	F2FS_NODE_CACHE,
 	F2FS_COMPRESS_CACHE,
+	NR_CACHE_TYPES,
 };
 
 /* Main cache control structure (per sb_info) */
diff --git a/fs/f2fs/debug.c b/fs/f2fs/debug.c
index 8cd06f7ba9e7..68a9d589da8c 100644
--- a/fs/f2fs/debug.c
+++ b/fs/f2fs/debug.c
@@ -380,17 +380,36 @@ static void update_mem_info(struct f2fs_sb_info *sbi)
 		si->cache_mem += si->ext_mem[i];
 	}
 
-	si->page_mem = 0;
-	si->page_mem += (unsigned long long)META_CACHE(sbi)->num_entries << PAGE_SHIFT;
-	si->cache_mem += META_CACHE(sbi)->num_entries * sizeof(struct f2fs_cached_block);
-	si->page_mem += (unsigned long long)NODE_CACHE(sbi)->num_entries << PAGE_SHIFT;
-	si->cache_mem += NODE_CACHE(sbi)->num_entries * sizeof(struct f2fs_cached_block);
+	si->cache_entry_mem[F2FS_META_CACHE] =
+		(unsigned long long)META_CACHE(sbi)->num_entries *
+		sizeof(struct f2fs_cached_block);
+	si->cache_data_mem[F2FS_META_CACHE] =
+		(unsigned long long)META_CACHE(sbi)->num_entries * sbi->blocksize;
+
+	si->cache_entry_mem[F2FS_NODE_CACHE] =
+		(unsigned long long)NODE_CACHE(sbi)->num_entries *
+		sizeof(struct f2fs_cached_block);
+	si->cache_data_mem[F2FS_NODE_CACHE] =
+		(unsigned long long)NODE_CACHE(sbi)->num_entries * sbi->blocksize;
+
+	si->cache_mem += si->cache_entry_mem[F2FS_META_CACHE] +
+			 si->cache_entry_mem[F2FS_NODE_CACHE];
+	si->page_mem = si->cache_data_mem[F2FS_META_CACHE] +
+			si->cache_data_mem[F2FS_NODE_CACHE];
 #ifdef CONFIG_F2FS_FS_COMPRESSION
 	if (test_opt(sbi, COMPRESS_CACHE)) {
-		unsigned long npages = COMPRESS_CACHE(sbi)->num_entries;
-
-		si->page_mem += (unsigned long long)npages << PAGE_SHIFT;
-		si->cache_mem += npages * sizeof(struct f2fs_cached_block);
+		si->cache_entry_mem[F2FS_COMPRESS_CACHE] =
+			(unsigned long long)COMPRESS_CACHE(sbi)->num_entries *
+			sizeof(struct f2fs_cached_block);
+		si->cache_data_mem[F2FS_COMPRESS_CACHE] =
+			(unsigned long long)COMPRESS_CACHE(sbi)->num_entries *
+			sbi->blocksize;
+
+		si->cache_mem += si->cache_entry_mem[F2FS_COMPRESS_CACHE];
+		si->page_mem += si->cache_data_mem[F2FS_COMPRESS_CACHE];
+	} else {
+		si->cache_entry_mem[F2FS_COMPRESS_CACHE] = 0;
+		si->cache_data_mem[F2FS_COMPRESS_CACHE] = 0;
 	}
 #endif
 }
@@ -749,6 +768,18 @@ static int stat_show(struct seq_file *s, void *v)
 				si->ext_mem[EX_READ] >> 10);
 		seq_printf(s, "  - block age extent cache: %llu KB\n",
 				si->ext_mem[EX_BLOCK_AGE] >> 10);
+		seq_printf(s, "  - meta entry: %llu KB, meta cache: %llu KB\n",
+				si->cache_entry_mem[F2FS_META_CACHE] >> 10,
+				si->cache_data_mem[F2FS_META_CACHE] >> 10);
+		seq_printf(s, "  - node entry: %llu KB, node cache: %llu KB\n",
+				si->cache_entry_mem[F2FS_NODE_CACHE] >> 10,
+				si->cache_data_mem[F2FS_NODE_CACHE] >> 10);
+#ifdef CONFIG_F2FS_FS_COMPRESSION
+		if (test_opt(sbi, COMPRESS_CACHE))
+			seq_printf(s, "  - compress entry: %llu KB, compress cache: %llu KB\n",
+					si->cache_entry_mem[F2FS_COMPRESS_CACHE] >> 10,
+					si->cache_data_mem[F2FS_COMPRESS_CACHE] >> 10);
+#endif
 		seq_printf(s, "  - paged : %llu KB\n",
 				si->page_mem >> 10);
 	}
diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index a6f3abb0a194..c230e70947f8 100644
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -4454,6 +4454,8 @@ struct f2fs_stat_info {
 	unsigned int block_count[2];
 	unsigned int inplace_count;
 	unsigned long long base_mem, cache_mem, page_mem;
+	unsigned long long cache_entry_mem[NR_CACHE_TYPES];
+	unsigned long long cache_data_mem[NR_CACHE_TYPES];
 	struct f2fs_dev_stats *dev_stats;
 };
 
-- 
2.49.0