From: Chao Yu <chao@kernel.org>
To: jaegeuk@kernel.org
Cc: linux-f2fs-devel@lists.sourceforge.net,
linux-kernel@vger.kernel.org, Chao Yu <chao@kernel.org>
Subject: [PATCH v1 12/12] f2fs: cache: show per-cache usage in debugfs
Date: Thu, 20 Aug 2026 11:17:21 +0800 [thread overview]
Message-ID: <20260820031721.12218-13-chao@kernel.org> (raw)
In-Reply-To: <20260820031721.12218-1-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 12c061d28d23..dccfc90fbab1 100644
--- a/fs/f2fs/cache.h
+++ b/fs/f2fs/cache.h
@@ -39,6 +39,7 @@ 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 0a749a59f386..42952dde79e0 100644
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -4453,6 +4453,8 @@ 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
prev parent reply other threads:[~2026-08-20 3:17 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-08-20 3:17 [PATCH v1 00/12] f2fs: introduce metadata cache Chao Yu
2026-08-20 3:17 ` [PATCH v1 01/12] f2fs: cache: implement " Chao Yu
2026-08-20 5:08 ` [f2fs-dev] " Jaegeuk Kim
2026-08-20 5:13 ` Chao Yu
2026-08-20 3:17 ` [PATCH v1 02/12] f2fs: cache: initialize meta cache Chao Yu
2026-08-20 3:17 ` [PATCH v1 03/12] f2fs: cache: introduce shrinker Chao Yu
2026-08-20 3:17 ` [PATCH v1 04/12] f2fs: cache: introduce writeback thread Chao Yu
2026-08-20 5:09 ` [f2fs-dev] " Jaegeuk Kim
2026-08-20 3:17 ` [PATCH v1 05/12] f2fs: cache: use meta cache Chao Yu
2026-08-20 5:11 ` [f2fs-dev] " Jaegeuk Kim
2026-08-20 3:17 ` [PATCH v1 06/12] f2fs: cache: initialize node cache Chao Yu
2026-08-20 3:17 ` [PATCH v1 07/12] f2fs: cache: use " Chao Yu
2026-08-20 3:17 ` [PATCH v1 08/12] f2fs: cache: initialize compress cache Chao Yu
2026-08-20 3:17 ` [PATCH v1 09/12] f2fs: cache: use " Chao Yu
2026-08-20 3:17 ` [PATCH v1 10/12] f2fs: cache: support fault injection Chao Yu
2026-08-20 3:17 ` [PATCH v1 11/12] f2fs: cache: introduce tracepoints Chao Yu
2026-08-20 3:17 ` Chao Yu [this message]
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