[PATCH v5] f2fs: add sysfs nodes to get runtime compression stat

From: Daeho Jeong
Date: Mon Mar 15 2021 - 04:13:20 EST

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From: Daeho Jeong <daehojeong@xxxxxxxxxx>

I've added new sysfs nodes to show runtime compression stat since mount.
compr_written_block - show the block count written after compression
compr_saved_block - show the saved block count with compression
compr_new_inode - show the count of inode newly enabled for compression

Signed-off-by: Daeho Jeong <daehojeong@xxxxxxxxxx>
---
v2: thanks to kernel test robot <lkp@xxxxxxxxx>, fixed compile issue
related to kernel config
v3: changed sysfs nodes' names and made them runtime stat, not
persistent on disk
v4: changed sysfs nodes' desctiption
v5: changed not to use atomic values
---
Documentation/ABI/testing/sysfs-fs-f2fs | 24 ++++++++++++++++
fs/f2fs/compress.c | 1 +
fs/f2fs/f2fs.h | 19 +++++++++++++
fs/f2fs/sysfs.c | 38 +++++++++++++++++++++++++
4 files changed, 82 insertions(+)

diff --git a/Documentation/ABI/testing/sysfs-fs-f2fs b/Documentation/ABI/testing/sysfs-fs-f2fs
index cbeac1bebe2f..ddd4bd6116fc 100644
--- a/Documentation/ABI/testing/sysfs-fs-f2fs
+++ b/Documentation/ABI/testing/sysfs-fs-f2fs
@@ -409,3 +409,27 @@ Description: Give a way to change checkpoint merge daemon's io priority.
I/O priority "3". We can select the class between "rt" and "be",
and set the I/O priority within valid range of it. "," delimiter
is necessary in between I/O class and priority number.
+
+What: /sys/fs/f2fs/<disk>/compr_written_block
+Date: March 2021
+Contact: "Daeho Jeong" <daehojeong@xxxxxxxxxx>
+Description: Show the block count written after compression since mount. Note
+ that when the compressed blocks are deleted, this count doesn't
+ decrease. If you write "0" here, you can initialize
+ compr_written_block and compr_saved_block to "0".
+
+What: /sys/fs/f2fs/<disk>/compr_saved_block
+Date: March 2021
+Contact: "Daeho Jeong" <daehojeong@xxxxxxxxxx>
+Description: Show the saved block count with compression since mount. Note
+ that when the compressed blocks are deleted, this count doesn't
+ decrease. If you write "0" here, you can initialize
+ compr_written_block and compr_saved_block to "0".
+
+What: /sys/fs/f2fs/<disk>/compr_new_inode
+Date: March 2021
+Contact: "Daeho Jeong" <daehojeong@xxxxxxxxxx>
+Description: Show the count of inode newly enabled for compression since mount.
+ Note that when the compression is disabled for the files, this count
+ doesn't decrease. If you write "0" here, you can initialize
+ compr_new_inode to "0".
diff --git a/fs/f2fs/compress.c b/fs/f2fs/compress.c
index 77fa342de38f..3c9d797dbdd6 100644
--- a/fs/f2fs/compress.c
+++ b/fs/f2fs/compress.c
@@ -1353,6 +1353,7 @@ static int f2fs_write_compressed_pages(struct compress_ctx *cc,
if (fio.compr_blocks)
f2fs_i_compr_blocks_update(inode, fio.compr_blocks - 1, false);
f2fs_i_compr_blocks_update(inode, cc->nr_cpages, true);
+ add_compr_block_stat(inode, cc->nr_cpages);

set_inode_flag(cc->inode, FI_APPEND_WRITE);
if (cc->cluster_idx == 0)
diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index e2d302ae3a46..ae7e08aa7d87 100644
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -1623,6 +1623,11 @@ struct f2fs_sb_info {
#ifdef CONFIG_F2FS_FS_COMPRESSION
struct kmem_cache *page_array_slab; /* page array entry */
unsigned int page_array_slab_size; /* default page array slab size */
+
+ /* For runtime compression statistics */
+ u64 compr_written_block;
+ u64 compr_saved_block;
+ u32 compr_new_inode;
#endif
};

@@ -3955,6 +3960,18 @@ int f2fs_init_page_array_cache(struct f2fs_sb_info *sbi);
void f2fs_destroy_page_array_cache(struct f2fs_sb_info *sbi);
int __init f2fs_init_compress_cache(void);
void f2fs_destroy_compress_cache(void);
+#define inc_compr_inode_stat(inode) \
+ do { \
+ struct f2fs_sb_info *sbi = F2FS_I_SB(inode); \
+ sbi->compr_new_inode++; \
+ } while (0)
+#define add_compr_block_stat(inode, blocks) \
+ do { \
+ struct f2fs_sb_info *sbi = F2FS_I_SB(inode); \
+ int diff = F2FS_I(inode)->i_cluster_size - blocks; \
+ sbi->compr_written_block += blocks; \
+ sbi->compr_saved_block += diff; \
+ } while (0)
#else
static inline bool f2fs_is_compressed_page(struct page *page) { return false; }
static inline bool f2fs_is_compress_backend_ready(struct inode *inode)
@@ -3983,6 +4000,7 @@ static inline int f2fs_init_page_array_cache(struct f2fs_sb_info *sbi) { return
static inline void f2fs_destroy_page_array_cache(struct f2fs_sb_info *sbi) { }
static inline int __init f2fs_init_compress_cache(void) { return 0; }
static inline void f2fs_destroy_compress_cache(void) { }
+#define inc_compr_inode_stat(inode) do { } while (0)
#endif

static inline void set_compress_context(struct inode *inode)
@@ -4006,6 +4024,7 @@ static inline void set_compress_context(struct inode *inode)
F2FS_I(inode)->i_flags |= F2FS_COMPR_FL;
set_inode_flag(inode, FI_COMPRESSED_FILE);
stat_inc_compr_inode(inode);
+ inc_compr_inode_stat(inode);
f2fs_mark_inode_dirty_sync(inode, true);
}

diff --git a/fs/f2fs/sysfs.c b/fs/f2fs/sysfs.c
index e38a7f6921dd..a166eebbe019 100644
--- a/fs/f2fs/sysfs.c
+++ b/fs/f2fs/sysfs.c
@@ -12,6 +12,7 @@
#include <linux/seq_file.h>
#include <linux/unicode.h>
#include <linux/ioprio.h>
+#include <linux/sysfs.h>

#include "f2fs.h"
#include "segment.h"
@@ -282,6 +283,17 @@ static ssize_t f2fs_sbi_show(struct f2fs_attr *a,
return len;
}

+#ifdef CONFIG_F2FS_FS_COMPRESSION
+ if (!strcmp(a->attr.name, "compr_written_block"))
+ return sysfs_emit(buf, "%llu\n", sbi->compr_written_block);
+
+ if (!strcmp(a->attr.name, "compr_saved_block"))
+ return sysfs_emit(buf, "%llu\n", sbi->compr_saved_block);
+
+ if (!strcmp(a->attr.name, "compr_new_inode"))
+ return sysfs_emit(buf, "%u\n", sbi->compr_new_inode);
+#endif
+
ui = (unsigned int *)(ptr + a->offset);

return sprintf(buf, "%u\n", *ui);
@@ -458,6 +470,24 @@ static ssize_t __sbi_store(struct f2fs_attr *a,
return count;
}

+#ifdef CONFIG_F2FS_FS_COMPRESSION
+ if (!strcmp(a->attr.name, "compr_written_block") ||
+ !strcmp(a->attr.name, "compr_saved_block")) {
+ if (t != 0)
+ return -EINVAL;
+ sbi->compr_written_block = 0;
+ sbi->compr_saved_block = 0;
+ return count;
+ }
+
+ if (!strcmp(a->attr.name, "compr_new_inode")) {
+ if (t != 0)
+ return -EINVAL;
+ sbi->compr_new_inode = 0;
+ return count;
+ }
+#endif
+
*ui = (unsigned int)t;

return count;
@@ -668,6 +698,9 @@ F2FS_FEATURE_RO_ATTR(sb_checksum, FEAT_SB_CHECKSUM);
F2FS_FEATURE_RO_ATTR(casefold, FEAT_CASEFOLD);
#ifdef CONFIG_F2FS_FS_COMPRESSION
F2FS_FEATURE_RO_ATTR(compression, FEAT_COMPRESSION);
+F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, compr_written_block, compr_written_block);
+F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, compr_saved_block, compr_saved_block);
+F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, compr_new_inode, compr_new_inode);
#endif

#define ATTR_LIST(name) (&f2fs_attr_##name.attr)
@@ -730,6 +763,11 @@ static struct attribute *f2fs_attrs[] = {
ATTR_LIST(moved_blocks_foreground),
ATTR_LIST(moved_blocks_background),
ATTR_LIST(avg_vblocks),
+#endif
+#ifdef CONFIG_F2FS_FS_COMPRESSION
+ ATTR_LIST(compr_written_block),
+ ATTR_LIST(compr_saved_block),
+ ATTR_LIST(compr_new_inode),
#endif
NULL,
};
--
2.31.0.rc2.261.g7f71774620-goog

Next message: qiang . zhang: "[PATCH v2] bpf: Fix memory leak in copy_process()"
Previous message: Lee Jones: "Re: [PATCH v3] mfd: ntxec: Support for EC in Tolino Shine 2 HD"
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