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{libbpf-tools,tools}/vfsstat: Add unlink,mkdir,rmdir stat (#4995)
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The program counts OPEN and CREATE, so UNLINK statistics are very valuable.
At the same time, statistics on folder creation and deletion are added.

Test MKDIR/RMDIR:

    $ while :; do mkdir a.dir && rmdir a.dir; done

Test UNLINK:

    $ while :; do touch a.out && rm a.out; done

Signed-off-by: Rong Tao <rongtao@cestc.cn>
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@Rtoax
Rtoax committed May 10, 2024
1 parent aa5ae41 commit 01bd3e4
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Showing 5 changed files with 88 additions and 17 deletions.
36 changes: 36 additions & 0 deletions libbpf-tools/vfsstat.bpf.c
View file
Expand Up @@ -45,6 +45,24 @@ int BPF_KPROBE(kprobe_vfs_create)
return inc_stats(S_CREATE);
}

SEC("kprobe/vfs_unlink")
int BPF_KPROBE(kprobe_vfs_unlink)
{
return inc_stats(S_UNLINK);
}

SEC("kprobe/vfs_mkdir")
int BPF_KPROBE(kprobe_vfs_mkdir)
{
return inc_stats(S_MKDIR);
}

SEC("kprobe/vfs_rmdir")
int BPF_KPROBE(kprobe_vfs_rmdir)
{
return inc_stats(S_RMDIR);
}

SEC("fentry/vfs_read")
int BPF_PROG(fentry_vfs_read)
{
Expand Down Expand Up @@ -75,4 +93,22 @@ int BPF_PROG(fentry_vfs_create)
return inc_stats(S_CREATE);
}

SEC("fentry/vfs_unlink")
int BPF_PROG(fentry_vfs_unlink)
{
return inc_stats(S_UNLINK);
}

SEC("fentry/vfs_mkdir")
int BPF_PROG(fentry_vfs_mkdir)
{
return inc_stats(S_MKDIR);
}

SEC("fentry/vfs_rmdir")
int BPF_PROG(fentry_vfs_rmdir)
{
return inc_stats(S_RMDIR);
}

char LICENSE[] SEC("license") = "GPL";
9 changes: 9 additions & 0 deletions libbpf-tools/vfsstat.c
View file
Expand Up @@ -110,6 +110,9 @@ static const char *stat_types_names[] = {
[S_FSYNC] = "FSYNC",
[S_OPEN] = "OPEN",
[S_CREATE] = "CREATE",
[S_UNLINK] = "UNLINK",
[S_MKDIR] = "MKDIR",
[S_RMDIR] = "RMDIR",
};

static void print_header(void)
Expand Down Expand Up @@ -174,12 +177,18 @@ int main(int argc, char **argv)
bpf_program__set_autoload(skel->progs.kprobe_vfs_fsync, false);
bpf_program__set_autoload(skel->progs.kprobe_vfs_open, false);
bpf_program__set_autoload(skel->progs.kprobe_vfs_create, false);
bpf_program__set_autoload(skel->progs.kprobe_vfs_unlink, false);
bpf_program__set_autoload(skel->progs.kprobe_vfs_mkdir, false);
bpf_program__set_autoload(skel->progs.kprobe_vfs_rmdir, false);
} else {
bpf_program__set_autoload(skel->progs.fentry_vfs_read, false);
bpf_program__set_autoload(skel->progs.fentry_vfs_write, false);
bpf_program__set_autoload(skel->progs.fentry_vfs_fsync, false);
bpf_program__set_autoload(skel->progs.fentry_vfs_open, false);
bpf_program__set_autoload(skel->progs.fentry_vfs_create, false);
bpf_program__set_autoload(skel->progs.fentry_vfs_unlink, false);
bpf_program__set_autoload(skel->progs.fentry_vfs_mkdir, false);
bpf_program__set_autoload(skel->progs.fentry_vfs_rmdir, false);
}

err = vfsstat_bpf__load(skel);
Expand Down
3 changes: 3 additions & 0 deletions libbpf-tools/vfsstat.h
View file
Expand Up @@ -9,6 +9,9 @@ enum stat_types {
S_FSYNC,
S_OPEN,
S_CREATE,
S_UNLINK,
S_MKDIR,
S_RMDIR,
S_MAXSTAT,
};

Expand Down
18 changes: 17 additions & 1 deletion tools/vfsstat.py
View file
Expand Up @@ -13,6 +13,7 @@
#
# 14-Aug-2015 Brendan Gregg Created this.
# 12-Oct-2022 Rocky Xing Added PID filter support.
# 09-May-2024 Rong Tao Add unlink,mkdir,rmdir stat.

from __future__ import print_function
from bcc import BPF
Expand Down Expand Up @@ -54,6 +55,9 @@
S_FSYNC,
S_OPEN,
S_CREATE,
S_UNLINK,
S_MKDIR,
S_RMDIR,
S_MAXSTAT
};
Expand All @@ -71,6 +75,9 @@
void do_fsync(struct pt_regs *ctx) { stats_try_increment(S_FSYNC); }
void do_open(struct pt_regs *ctx) { stats_try_increment(S_OPEN); }
void do_create(struct pt_regs *ctx) { stats_try_increment(S_CREATE); }
void do_unlink(struct pt_regs *ctx) { stats_try_increment(S_UNLINK); }
void do_mkdir(struct pt_regs *ctx) { stats_try_increment(S_MKDIR); }
void do_rmdir(struct pt_regs *ctx) { stats_try_increment(S_RMDIR); }
"""

bpf_text_kfunc = """
Expand All @@ -79,6 +86,9 @@
KFUNC_PROBE(vfs_fsync_range) { stats_try_increment(S_FSYNC); return 0; }
KFUNC_PROBE(vfs_open) { stats_try_increment(S_OPEN); return 0; }
KFUNC_PROBE(vfs_create) { stats_try_increment(S_CREATE); return 0; }
KFUNC_PROBE(vfs_unlink) { stats_try_increment(S_UNLINK); return 0; }
KFUNC_PROBE(vfs_mkdir) { stats_try_increment(S_MKDIR); return 0; }
KFUNC_PROBE(vfs_rmdir) { stats_try_increment(S_RMDIR); return 0; }
"""

is_support_kfunc = BPF.support_kfunc()
Expand Down Expand Up @@ -109,14 +119,20 @@
b.attach_kprobe(event="vfs_fsync_range", fn_name="do_fsync")
b.attach_kprobe(event="vfs_open", fn_name="do_open")
b.attach_kprobe(event="vfs_create", fn_name="do_create")
b.attach_kprobe(event="vfs_unlink", fn_name="do_unlink")
b.attach_kprobe(event="vfs_mkdir", fn_name="do_mkdir")
b.attach_kprobe(event="vfs_rmdir", fn_name="do_rmdir")

# stat column labels and indexes
stat_types = {
"READ": 1,
"WRITE": 2,
"FSYNC": 3,
"OPEN": 4,
"CREATE": 5
"CREATE": 5,
"UNLINK": 6,
"MKDIR": 7,
"RMDIR": 8,
}

# header
Expand Down
39 changes: 23 additions & 16 deletions tools/vfsstat_example.txt
View file
Expand Up @@ -5,29 +5,36 @@ This traces some common VFS calls and prints per-second summaries. By default,
the output interval is one second:

# ./vfsstat
TIME READ/s WRITE/s CREATE/s OPEN/s FSYNC/s
18:35:32: 231 12 4 98 0
18:35:33: 274 13 4 106 0
18:35:34: 586 86 4 251 0
18:35:35: 241 15 4 99 0
18:35:36: 232 10 4 98 0
18:35:37: 244 10 4 107 0
18:35:38: 235 13 4 97 0
18:35:39: 6749 2633 4 1446 0
18:35:40: 277 31 4 115 0
18:35:41: 238 16 6 102 0
18:35:42: 284 50 8 114 0
TIME READ/s WRITE/s FSYNC/s OPEN/s CREATE/s UNLINK/s MKDIR/s RMDIR/s
10:42:35: 5172 454 0 111 0 0 0 0
10:42:36: 478 701 0 1 0 0 0 0
10:42:37: 873 267 0 861 0 72 0 0
10:42:38: 1599 146 0 1989 0 177 0 0
10:42:39: 1876 135 0 2379 0 212 0 0
10:42:40: 2566 201 0 3207 0 287 0 0
10:42:41: 772 508 0 563 0 49 0 0
10:42:42: 189 141 0 48 0 0 0 0
10:42:43: 468 558 0 48 0 0 0 0
10:42:44: 1144 841 0 624 0 0 0 0
10:42:45: 4094 2554 0 2715 0 0 0 0
10:42:46: 397 585 0 12 0 0 0 0
10:42:47: 684 859 0 56 0 0 0 0
10:42:48: 432 471 0 63 0 1 0 0
10:42:49: 1890 259 0 1997 0 0 162 162
10:42:50: 1990 143 0 2213 0 0 181 180
10:42:51: 2256 197 0 2472 0 0 205 206
10:42:52: 1674 351 0 1609 0 0 129 129
^C


Here we are using an output interval of five seconds, and printing three output
lines:

# ./vfsstat 5 3
TIME READ/s WRITE/s CREATE/s OPEN/s FSYNC/s
18:35:55: 238 8 3 101 0
18:36:00: 962 233 4 247 0
18:36:05: 241 8 3 100 0
TIME READ/s WRITE/s FSYNC/s OPEN/s CREATE/s UNLINK/s MKDIR/s RMDIR/s
10:43:46: 2141 273 0 1240 0 0 99 99
10:43:51: 2673 141 0 3039 0 0 250 249
10:43:56: 1939 433 0 1895 0 0 154 154


Full usage:
Expand Down

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