From f17987c6219e91d020620928f79af7b0fe98dad9 Mon Sep 17 00:00:00 2001 From: Chao Yu Date: Thu, 17 Sep 2026 15:33:43 +0800 Subject: [PATCH] f2fs: cache: show per-cache usage in debugfs 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 Reviewed-by: Zhiguo Niu Signed-off-by: Chao Yu Signed-off-by: Jaegeuk Kim --- fs/f2fs/cache.h | 1 + fs/f2fs/debug.c | 47 +++++++++++++++++++++++++++++++++++++++-------- fs/f2fs/f2fs.h | 2 ++ 3 files changed, 42 insertions(+), 8 deletions(-) diff --git a/fs/f2fs/cache.h b/fs/f2fs/cache.h index e50b9ad6fdae..6c4db910d767 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 4ed5c271dba3..8c0cffde2457 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->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->page_mem += (unsigned long long)npages << PAGE_SHIFT; - si->cache_mem += npages * sizeof(struct f2fs_cached_block); + 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 c6aade930e32..932f9af25ebe 100644 --- a/fs/f2fs/f2fs.h +++ b/fs/f2fs/f2fs.h @@ -4525,6 +4525,8 @@ 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; };