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-rw-r--r--fs/f2fs/iostat.c154
1 files changed, 154 insertions, 0 deletions
diff --git a/fs/f2fs/iostat.c b/fs/f2fs/iostat.c
new file mode 100644
index 000000000000..21c29e121a86
--- /dev/null
+++ b/fs/f2fs/iostat.c
@@ -0,0 +1,154 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * f2fs iostat support
+ *
+ * Copyright 2021 Google LLC
+ * Author: Daeho Jeong <daehojeong@google.com>
+ */
+
+#include <linux/fs.h>
+#include <linux/f2fs_fs.h>
+#include <linux/seq_file.h>
+
+#include "f2fs.h"
+#include "iostat.h"
+#include <trace/events/f2fs.h>
+
+int __maybe_unused iostat_info_seq_show(struct seq_file *seq, void *offset)
+{
+ struct super_block *sb = seq->private;
+ struct f2fs_sb_info *sbi = F2FS_SB(sb);
+ time64_t now = ktime_get_real_seconds();
+
+ if (!sbi->iostat_enable)
+ return 0;
+
+ seq_printf(seq, "time: %-16llu\n", now);
+
+ /* print app write IOs */
+ seq_puts(seq, "[WRITE]\n");
+ seq_printf(seq, "app buffered: %-16llu\n",
+ sbi->rw_iostat[APP_BUFFERED_IO]);
+ seq_printf(seq, "app direct: %-16llu\n",
+ sbi->rw_iostat[APP_DIRECT_IO]);
+ seq_printf(seq, "app mapped: %-16llu\n",
+ sbi->rw_iostat[APP_MAPPED_IO]);
+
+ /* print fs write IOs */
+ seq_printf(seq, "fs data: %-16llu\n",
+ sbi->rw_iostat[FS_DATA_IO]);
+ seq_printf(seq, "fs node: %-16llu\n",
+ sbi->rw_iostat[FS_NODE_IO]);
+ seq_printf(seq, "fs meta: %-16llu\n",
+ sbi->rw_iostat[FS_META_IO]);
+ seq_printf(seq, "fs gc data: %-16llu\n",
+ sbi->rw_iostat[FS_GC_DATA_IO]);
+ seq_printf(seq, "fs gc node: %-16llu\n",
+ sbi->rw_iostat[FS_GC_NODE_IO]);
+ seq_printf(seq, "fs cp data: %-16llu\n",
+ sbi->rw_iostat[FS_CP_DATA_IO]);
+ seq_printf(seq, "fs cp node: %-16llu\n",
+ sbi->rw_iostat[FS_CP_NODE_IO]);
+ seq_printf(seq, "fs cp meta: %-16llu\n",
+ sbi->rw_iostat[FS_CP_META_IO]);
+
+ /* print app read IOs */
+ seq_puts(seq, "[READ]\n");
+ seq_printf(seq, "app buffered: %-16llu\n",
+ sbi->rw_iostat[APP_BUFFERED_READ_IO]);
+ seq_printf(seq, "app direct: %-16llu\n",
+ sbi->rw_iostat[APP_DIRECT_READ_IO]);
+ seq_printf(seq, "app mapped: %-16llu\n",
+ sbi->rw_iostat[APP_MAPPED_READ_IO]);
+
+ /* print fs read IOs */
+ seq_printf(seq, "fs data: %-16llu\n",
+ sbi->rw_iostat[FS_DATA_READ_IO]);
+ seq_printf(seq, "fs gc data: %-16llu\n",
+ sbi->rw_iostat[FS_GDATA_READ_IO]);
+ seq_printf(seq, "fs compr_data: %-16llu\n",
+ sbi->rw_iostat[FS_CDATA_READ_IO]);
+ seq_printf(seq, "fs node: %-16llu\n",
+ sbi->rw_iostat[FS_NODE_READ_IO]);
+ seq_printf(seq, "fs meta: %-16llu\n",
+ sbi->rw_iostat[FS_META_READ_IO]);
+
+ /* print other IOs */
+ seq_puts(seq, "[OTHER]\n");
+ seq_printf(seq, "fs discard: %-16llu\n",
+ sbi->rw_iostat[FS_DISCARD]);
+
+ return 0;
+}
+
+static inline void f2fs_record_iostat(struct f2fs_sb_info *sbi)
+{
+ unsigned long long iostat_diff[NR_IO_TYPE];
+ int i;
+
+ if (time_is_after_jiffies(sbi->iostat_next_period))
+ return;
+
+ /* Need double check under the lock */
+ spin_lock(&sbi->iostat_lock);
+ if (time_is_after_jiffies(sbi->iostat_next_period)) {
+ spin_unlock(&sbi->iostat_lock);
+ return;
+ }
+ sbi->iostat_next_period = jiffies +
+ msecs_to_jiffies(sbi->iostat_period_ms);
+
+ for (i = 0; i < NR_IO_TYPE; i++) {
+ iostat_diff[i] = sbi->rw_iostat[i] -
+ sbi->prev_rw_iostat[i];
+ sbi->prev_rw_iostat[i] = sbi->rw_iostat[i];
+ }
+ spin_unlock(&sbi->iostat_lock);
+
+ trace_f2fs_iostat(sbi, iostat_diff);
+}
+
+void f2fs_reset_iostat(struct f2fs_sb_info *sbi)
+{
+ int i;
+
+ spin_lock(&sbi->iostat_lock);
+ for (i = 0; i < NR_IO_TYPE; i++) {
+ sbi->rw_iostat[i] = 0;
+ sbi->prev_rw_iostat[i] = 0;
+ }
+ spin_unlock(&sbi->iostat_lock);
+}
+
+void f2fs_update_iostat(struct f2fs_sb_info *sbi,
+ enum iostat_type type, unsigned long long io_bytes)
+{
+ if (!sbi->iostat_enable)
+ return;
+
+ spin_lock(&sbi->iostat_lock);
+ sbi->rw_iostat[type] += io_bytes;
+
+ if (type == APP_WRITE_IO || type == APP_DIRECT_IO)
+ sbi->rw_iostat[APP_BUFFERED_IO] =
+ sbi->rw_iostat[APP_WRITE_IO] -
+ sbi->rw_iostat[APP_DIRECT_IO];
+
+ if (type == APP_READ_IO || type == APP_DIRECT_READ_IO)
+ sbi->rw_iostat[APP_BUFFERED_READ_IO] =
+ sbi->rw_iostat[APP_READ_IO] -
+ sbi->rw_iostat[APP_DIRECT_READ_IO];
+ spin_unlock(&sbi->iostat_lock);
+
+ f2fs_record_iostat(sbi);
+}
+
+int f2fs_init_iostat(struct f2fs_sb_info *sbi)
+{
+ /* init iostat info */
+ spin_lock_init(&sbi->iostat_lock);
+ sbi->iostat_enable = false;
+ sbi->iostat_period_ms = DEFAULT_IOSTAT_PERIOD_MS;
+
+ return 0;
+}