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Date: Tue, 20 Oct 2009 17:15:20 +0900
From: Kazuya Mio <k-mio@...jp.nec.com>
To: ext4 <linux-ext4@...r.kernel.org>, Theodore Tso <tytso@....edu>,
Greg Freemyer <greg.freemyer@...il.com>
Subject: [RFC][PATCH v2 1/4] e4defrag: output size per extent by -c option
Hi,
I have addressed Greg's comments.
(http://marc.info/?l=linux-ext4&m=125433530126348&w=4)
e4defrag with -c option outputs "ratio" that means the levels of
fragmentation. However, it's difficult for users to understand, so we will
use size per extent instead of ratio.
Before:
# e4defrag -c /mnt/mp1/file
<File> now/best ratio
/mnt/mp1/file 6/1 0.00%
Total/best extents 6/1
Fragmentation ratio 0.00%
Fragmentation score 0.04
[0-30 no problem: 31-55 a little bit fragmented: 55- needs defrag]
This file(/mnt/mp1/file) does not need defragmentation.
Done.
After:
# e4defrag -c /mnt/mp1/file
<File> now/best size/ext
/mnt/mp1/file 6/1 16666 KB
Total/best extents 6/1
Average size per extent 16666 KB
Fragmentation score 0
[0-30 no problem: 31-55 a little bit fragmented: 56- needs defrag]
This file (/mnt/mp1/file) does not need defragmentation.
Done.
Signed-off-by: Kazuya Mio <k-mio@...jp.nec.com>
---
e4defrag.c | 76 +++++++++++++++++++++++++++++++++++++++++--------------------
1 file changed, 52 insertions(+), 24 deletions(-)
diff --git a/misc/e4defrag.c b/misc/e4defrag.c
index 82e3868..d8c7d97 100644
--- a/misc/e4defrag.c
+++ b/misc/e4defrag.c
@@ -160,6 +160,7 @@ struct move_extent {
struct frag_statistic_ino {
int now_count; /* the file's extents count of before defrag */
int best_count; /* the best file's extents count */
+ __u64 size_per_ext; /* size(KB) per extent */
float ratio; /* the ratio of fragmentation */
char msg_buffer[PATH_MAX + 1]; /* pathname of the file */
};
@@ -1212,6 +1213,7 @@ static int file_statistic(const char *file, const struct stat64 *buf,
int ret;
int now_ext_count, best_ext_count = 0, physical_ext_count;
int i, j;
+ __u64 size_per_ext = 0;
float ratio = 0.0;
ext4_fsblk_t blk_count = 0;
char msg_buffer[PATH_MAX + 24];
@@ -1312,12 +1314,16 @@ static int file_statistic(const char *file, const struct stat64 *buf,
now_ext_count = get_logical_count(logical_list_head);
if (current_uid == ROOT_UID) {
- /* Calculate fragment ratio */
+ /* Calculate the size per extent */
blk_count =
SECTOR_TO_BLOCK(buf->st_blocks, block_size);
best_ext_count = get_best_count(blk_count);
+ /* e4defrag rounds size_per_ext up to a block size boundary */
+ size_per_ext = blk_count * (buf->st_blksize / 1024) /
+ now_ext_count;
+
ratio = (float)(physical_ext_count - best_ext_count) * 100 /
blk_count;
@@ -1346,16 +1352,16 @@ static int file_statistic(const char *file, const struct stat64 *buf,
} else {
printf("%-40s%10s/%-10s%9s\n",
- "<File>", "now", "best", "ratio");
+ "<File>", "now", "best", "size/ext");
if (current_uid == ROOT_UID) {
if (strlen(file) > 40)
- printf("%s\n%50d/%-10d%8.2f%%\n",
+ printf("%s\n%50d/%-10d%6llu KB\n",
file, now_ext_count,
- best_ext_count, ratio);
+ best_ext_count, size_per_ext);
else
- printf("%-40s%10d/%-10d%8.2f%%\n",
+ printf("%-40s%10d/%-10d%6llu KB\n",
file, now_ext_count,
- best_ext_count, ratio);
+ best_ext_count, size_per_ext);
} else {
if (strlen(file) > 40)
printf("%s\n%50d/%-10s%7s\n",
@@ -1378,14 +1384,14 @@ static int file_statistic(const char *file, const struct stat64 *buf,
if (current_uid == ROOT_UID) {
if (strlen(msg_buffer) > 40)
printf("\033[79;0H\033[K%s\n"
- "%50d/%-10d%8.2f%%\n",
+ "%50d/%-10d%6llu KB\n",
msg_buffer, now_ext_count,
- best_ext_count, ratio);
+ best_ext_count, size_per_ext);
else
printf("\033[79;0H\033[K%-40s"
- "%10d/%-10d%8.2f%%\n",
+ "%10d/%-10d%6llu KB\n",
msg_buffer, now_ext_count,
- best_ext_count, ratio);
+ best_ext_count, size_per_ext);
} else {
if (strlen(msg_buffer) > 40)
printf("\033[79;0H\033[K%s\n%50d/%-10s%7s\n",
@@ -1401,8 +1407,20 @@ static int file_statistic(const char *file, const struct stat64 *buf,
for (i = 0; i < SHOW_FRAG_FILES; i++) {
if (ratio >= frag_rank[i].ratio) {
for (j = SHOW_FRAG_FILES - 1; j > i; j--) {
- memcpy(&frag_rank[j], &frag_rank[j - 1],
+ memset(&frag_rank[j], 0,
sizeof(struct frag_statistic_ino));
+ strncpy(frag_rank[j].msg_buffer,
+ frag_rank[j - 1].msg_buffer,
+ strnlen(frag_rank[j - 1].msg_buffer,
+ PATH_MAX));
+ frag_rank[j].now_count =
+ frag_rank[j - 1].now_count;
+ frag_rank[j].best_count =
+ frag_rank[j - 1].best_count;
+ frag_rank[j].size_per_ext =
+ frag_rank[j - 1].size_per_ext;
+ frag_rank[j].ratio =
+ frag_rank[j - 1].ratio;
}
memset(&frag_rank[i], 0,
sizeof(struct frag_statistic_ino));
@@ -1410,6 +1428,7 @@ static int file_statistic(const char *file, const struct stat64 *buf,
strnlen(file, PATH_MAX));
frag_rank[i].now_count = now_ext_count;
frag_rank[i].best_count = best_ext_count;
+ frag_rank[i].size_per_ext = size_per_ext;
frag_rank[i].ratio = ratio;
break;
}
@@ -1992,7 +2011,7 @@ int main(int argc, char *argv[])
if (mode_flag & STATISTIC) {
if (mode_flag & DETAIL)
printf("%-40s%10s/%-10s%9s\n",
- "<File>", "now", "best", "ratio");
+ "<File>", "now", "best", "size/ext");
if (!(mode_flag & DETAIL) &&
current_uid != ROOT_UID) {
@@ -2009,24 +2028,28 @@ int main(int argc, char *argv[])
printf("\n");
printf("%-40s%10s/%-10s%9s\n",
"<Fragmented files>", "now",
- "best", "ratio");
+ "best", "size/ext");
for (j = 0; j < SHOW_FRAG_FILES; j++) {
if (strlen(frag_rank[j].
msg_buffer) > 37) {
printf("%d. %s\n%50d/"
- "%-10d%8.2f%%\n", j + 1,
+ "%-10d%6llu KB\n",
+ j + 1,
frag_rank[j].msg_buffer,
frag_rank[j].now_count,
frag_rank[j].best_count,
- frag_rank[j].ratio);
+ frag_rank[j].
+ size_per_ext);
} else if (strlen(frag_rank[j].
msg_buffer) > 0) {
printf("%d. %-37s%10d/"
- "%-10d%8.2f%%\n", j + 1,
+ "%-10d%6llu KB\n",
+ j + 1,
frag_rank[j].msg_buffer,
frag_rank[j].now_count,
frag_rank[j].best_count,
- frag_rank[j].ratio);
+ frag_rank[j].
+ size_per_ext);
} else
break;
}
@@ -2109,26 +2132,31 @@ int main(int argc, char *argv[])
} else {
float files_ratio = 0.0;
float score = 0.0;
+ __u64 size_per_ext = files_block_count *
+ (buf.st_blksize / 1024) /
+ extents_before_defrag;
files_ratio = (float)(extents_before_defrag -
extents_after_defrag) *
100 / files_block_count;
score = CALC_SCORE(files_ratio);
printf("\n Total/best extents\t\t\t\t%d/%d\n"
- " Fragmentation ratio\t\t\t\t%.2f%%\n"
- " Fragmentation score\t\t\t\t%.2f\n",
+ " Average size per extent"
+ "\t\t\t%llu KB\n"
+ " Fragmentation score\t\t\t\t%.0f\n",
extents_before_defrag,
extents_after_defrag,
- files_ratio, score);
+ size_per_ext, score);
printf(" [0-30 no problem:"
" 31-55 a little bit fragmented:"
- " 55- needs defrag]\n");
+ " 56- needs defrag]\n");
if (arg_type == DEVNAME)
- printf(" This device(%s) ", argv[i]);
+ printf(" This device (%s) ", argv[i]);
else if (arg_type == DIRNAME)
- printf(" This directory(%s) ", argv[i]);
+ printf(" This directory (%s) ",
+ argv[i]);
else
- printf(" This file(%s) ", argv[i]);
+ printf(" This file (%s) ", argv[i]);
if (score > BOUND_SCORE)
printf("needs defragmentation.\n");
--
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