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-rw-r--r--fs/f2fs/iostat.c315
1 files changed, 315 insertions, 0 deletions
diff --git a/fs/f2fs/iostat.c b/fs/f2fs/iostat.c
new file mode 100644
index 0000000000..f8703038e1
--- /dev/null
+++ b/fs/f2fs/iostat.c
@@ -0,0 +1,315 @@
+// 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>
+
+static struct kmem_cache *bio_iostat_ctx_cache;
+static mempool_t *bio_iostat_ctx_pool;
+
+static inline unsigned long long iostat_get_avg_bytes(struct f2fs_sb_info *sbi,
+ enum iostat_type type)
+{
+ return sbi->iostat_count[type] ? div64_u64(sbi->iostat_bytes[type],
+ sbi->iostat_count[type]) : 0;
+}
+
+#define IOSTAT_INFO_SHOW(name, type) \
+ seq_printf(seq, "%-23s %-16llu %-16llu %-16llu\n", \
+ name":", sbi->iostat_bytes[type], \
+ sbi->iostat_count[type], \
+ iostat_get_avg_bytes(sbi, type))
+
+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);
+
+ if (!sbi->iostat_enable)
+ return 0;
+
+ seq_printf(seq, "time: %-16llu\n", ktime_get_real_seconds());
+ seq_printf(seq, "\t\t\t%-16s %-16s %-16s\n",
+ "io_bytes", "count", "avg_bytes");
+
+ /* print app write IOs */
+ seq_puts(seq, "[WRITE]\n");
+ IOSTAT_INFO_SHOW("app buffered data", APP_BUFFERED_IO);
+ IOSTAT_INFO_SHOW("app direct data", APP_DIRECT_IO);
+ IOSTAT_INFO_SHOW("app mapped data", APP_MAPPED_IO);
+ IOSTAT_INFO_SHOW("app buffered cdata", APP_BUFFERED_CDATA_IO);
+ IOSTAT_INFO_SHOW("app mapped cdata", APP_MAPPED_CDATA_IO);
+
+ /* print fs write IOs */
+ IOSTAT_INFO_SHOW("fs data", FS_DATA_IO);
+ IOSTAT_INFO_SHOW("fs cdata", FS_CDATA_IO);
+ IOSTAT_INFO_SHOW("fs node", FS_NODE_IO);
+ IOSTAT_INFO_SHOW("fs meta", FS_META_IO);
+ IOSTAT_INFO_SHOW("fs gc data", FS_GC_DATA_IO);
+ IOSTAT_INFO_SHOW("fs gc node", FS_GC_NODE_IO);
+ IOSTAT_INFO_SHOW("fs cp data", FS_CP_DATA_IO);
+ IOSTAT_INFO_SHOW("fs cp node", FS_CP_NODE_IO);
+ IOSTAT_INFO_SHOW("fs cp meta", FS_CP_META_IO);
+
+ /* print app read IOs */
+ seq_puts(seq, "[READ]\n");
+ IOSTAT_INFO_SHOW("app buffered data", APP_BUFFERED_READ_IO);
+ IOSTAT_INFO_SHOW("app direct data", APP_DIRECT_READ_IO);
+ IOSTAT_INFO_SHOW("app mapped data", APP_MAPPED_READ_IO);
+ IOSTAT_INFO_SHOW("app buffered cdata", APP_BUFFERED_CDATA_READ_IO);
+ IOSTAT_INFO_SHOW("app mapped cdata", APP_MAPPED_CDATA_READ_IO);
+
+ /* print fs read IOs */
+ IOSTAT_INFO_SHOW("fs data", FS_DATA_READ_IO);
+ IOSTAT_INFO_SHOW("fs gc data", FS_GDATA_READ_IO);
+ IOSTAT_INFO_SHOW("fs cdata", FS_CDATA_READ_IO);
+ IOSTAT_INFO_SHOW("fs node", FS_NODE_READ_IO);
+ IOSTAT_INFO_SHOW("fs meta", FS_META_READ_IO);
+
+ /* print other IOs */
+ seq_puts(seq, "[OTHER]\n");
+ IOSTAT_INFO_SHOW("fs discard", FS_DISCARD_IO);
+ IOSTAT_INFO_SHOW("fs flush", FS_FLUSH_IO);
+ IOSTAT_INFO_SHOW("fs zone reset", FS_ZONE_RESET_IO);
+
+ return 0;
+}
+
+static inline void __record_iostat_latency(struct f2fs_sb_info *sbi)
+{
+ int io, idx;
+ struct f2fs_iostat_latency iostat_lat[MAX_IO_TYPE][NR_PAGE_TYPE];
+ struct iostat_lat_info *io_lat = sbi->iostat_io_lat;
+ unsigned long flags;
+
+ spin_lock_irqsave(&sbi->iostat_lat_lock, flags);
+ for (idx = 0; idx < MAX_IO_TYPE; idx++) {
+ for (io = 0; io < NR_PAGE_TYPE; io++) {
+ iostat_lat[idx][io].peak_lat =
+ jiffies_to_msecs(io_lat->peak_lat[idx][io]);
+ iostat_lat[idx][io].cnt = io_lat->bio_cnt[idx][io];
+ iostat_lat[idx][io].avg_lat = iostat_lat[idx][io].cnt ?
+ jiffies_to_msecs(io_lat->sum_lat[idx][io]) / iostat_lat[idx][io].cnt : 0;
+ io_lat->sum_lat[idx][io] = 0;
+ io_lat->peak_lat[idx][io] = 0;
+ io_lat->bio_cnt[idx][io] = 0;
+ }
+ }
+ spin_unlock_irqrestore(&sbi->iostat_lat_lock, flags);
+
+ trace_f2fs_iostat_latency(sbi, iostat_lat);
+}
+
+static inline void f2fs_record_iostat(struct f2fs_sb_info *sbi)
+{
+ unsigned long long iostat_diff[NR_IO_TYPE];
+ int i;
+ unsigned long flags;
+
+ if (time_is_after_jiffies(sbi->iostat_next_period))
+ return;
+
+ /* Need double check under the lock */
+ spin_lock_irqsave(&sbi->iostat_lock, flags);
+ if (time_is_after_jiffies(sbi->iostat_next_period)) {
+ spin_unlock_irqrestore(&sbi->iostat_lock, flags);
+ 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->iostat_bytes[i] -
+ sbi->prev_iostat_bytes[i];
+ sbi->prev_iostat_bytes[i] = sbi->iostat_bytes[i];
+ }
+ spin_unlock_irqrestore(&sbi->iostat_lock, flags);
+
+ trace_f2fs_iostat(sbi, iostat_diff);
+
+ __record_iostat_latency(sbi);
+}
+
+void f2fs_reset_iostat(struct f2fs_sb_info *sbi)
+{
+ struct iostat_lat_info *io_lat = sbi->iostat_io_lat;
+ int i;
+
+ spin_lock_irq(&sbi->iostat_lock);
+ for (i = 0; i < NR_IO_TYPE; i++) {
+ sbi->iostat_count[i] = 0;
+ sbi->iostat_bytes[i] = 0;
+ sbi->prev_iostat_bytes[i] = 0;
+ }
+ spin_unlock_irq(&sbi->iostat_lock);
+
+ spin_lock_irq(&sbi->iostat_lat_lock);
+ memset(io_lat, 0, sizeof(struct iostat_lat_info));
+ spin_unlock_irq(&sbi->iostat_lat_lock);
+}
+
+static inline void __f2fs_update_iostat(struct f2fs_sb_info *sbi,
+ enum iostat_type type, unsigned long long io_bytes)
+{
+ sbi->iostat_bytes[type] += io_bytes;
+ sbi->iostat_count[type]++;
+}
+
+void f2fs_update_iostat(struct f2fs_sb_info *sbi, struct inode *inode,
+ enum iostat_type type, unsigned long long io_bytes)
+{
+ unsigned long flags;
+
+ if (!sbi->iostat_enable)
+ return;
+
+ spin_lock_irqsave(&sbi->iostat_lock, flags);
+ __f2fs_update_iostat(sbi, type, io_bytes);
+
+ if (type == APP_BUFFERED_IO || type == APP_DIRECT_IO)
+ __f2fs_update_iostat(sbi, APP_WRITE_IO, io_bytes);
+
+ if (type == APP_BUFFERED_READ_IO || type == APP_DIRECT_READ_IO)
+ __f2fs_update_iostat(sbi, APP_READ_IO, io_bytes);
+
+#ifdef CONFIG_F2FS_FS_COMPRESSION
+ if (inode && f2fs_compressed_file(inode)) {
+ if (type == APP_BUFFERED_IO)
+ __f2fs_update_iostat(sbi, APP_BUFFERED_CDATA_IO, io_bytes);
+
+ if (type == APP_BUFFERED_READ_IO)
+ __f2fs_update_iostat(sbi, APP_BUFFERED_CDATA_READ_IO, io_bytes);
+
+ if (type == APP_MAPPED_READ_IO)
+ __f2fs_update_iostat(sbi, APP_MAPPED_CDATA_READ_IO, io_bytes);
+
+ if (type == APP_MAPPED_IO)
+ __f2fs_update_iostat(sbi, APP_MAPPED_CDATA_IO, io_bytes);
+
+ if (type == FS_DATA_READ_IO)
+ __f2fs_update_iostat(sbi, FS_CDATA_READ_IO, io_bytes);
+
+ if (type == FS_DATA_IO)
+ __f2fs_update_iostat(sbi, FS_CDATA_IO, io_bytes);
+ }
+#endif
+
+ spin_unlock_irqrestore(&sbi->iostat_lock, flags);
+
+ f2fs_record_iostat(sbi);
+}
+
+static inline void __update_iostat_latency(struct bio_iostat_ctx *iostat_ctx,
+ enum iostat_lat_type lat_type)
+{
+ unsigned long ts_diff;
+ unsigned int page_type = iostat_ctx->type;
+ struct f2fs_sb_info *sbi = iostat_ctx->sbi;
+ struct iostat_lat_info *io_lat = sbi->iostat_io_lat;
+ unsigned long flags;
+
+ if (!sbi->iostat_enable)
+ return;
+
+ ts_diff = jiffies - iostat_ctx->submit_ts;
+ if (page_type == META_FLUSH) {
+ page_type = META;
+ } else if (page_type >= NR_PAGE_TYPE) {
+ f2fs_warn(sbi, "%s: %d over NR_PAGE_TYPE", __func__, page_type);
+ return;
+ }
+
+ spin_lock_irqsave(&sbi->iostat_lat_lock, flags);
+ io_lat->sum_lat[lat_type][page_type] += ts_diff;
+ io_lat->bio_cnt[lat_type][page_type]++;
+ if (ts_diff > io_lat->peak_lat[lat_type][page_type])
+ io_lat->peak_lat[lat_type][page_type] = ts_diff;
+ spin_unlock_irqrestore(&sbi->iostat_lat_lock, flags);
+}
+
+void iostat_update_and_unbind_ctx(struct bio *bio)
+{
+ struct bio_iostat_ctx *iostat_ctx = bio->bi_private;
+ enum iostat_lat_type lat_type;
+
+ if (op_is_write(bio_op(bio))) {
+ lat_type = bio->bi_opf & REQ_SYNC ?
+ WRITE_SYNC_IO : WRITE_ASYNC_IO;
+ bio->bi_private = iostat_ctx->sbi;
+ } else {
+ lat_type = READ_IO;
+ bio->bi_private = iostat_ctx->post_read_ctx;
+ }
+
+ __update_iostat_latency(iostat_ctx, lat_type);
+ mempool_free(iostat_ctx, bio_iostat_ctx_pool);
+}
+
+void iostat_alloc_and_bind_ctx(struct f2fs_sb_info *sbi,
+ struct bio *bio, struct bio_post_read_ctx *ctx)
+{
+ struct bio_iostat_ctx *iostat_ctx;
+ /* Due to the mempool, this never fails. */
+ iostat_ctx = mempool_alloc(bio_iostat_ctx_pool, GFP_NOFS);
+ iostat_ctx->sbi = sbi;
+ iostat_ctx->submit_ts = 0;
+ iostat_ctx->type = 0;
+ iostat_ctx->post_read_ctx = ctx;
+ bio->bi_private = iostat_ctx;
+}
+
+int __init f2fs_init_iostat_processing(void)
+{
+ bio_iostat_ctx_cache =
+ kmem_cache_create("f2fs_bio_iostat_ctx",
+ sizeof(struct bio_iostat_ctx), 0, 0, NULL);
+ if (!bio_iostat_ctx_cache)
+ goto fail;
+ bio_iostat_ctx_pool =
+ mempool_create_slab_pool(NUM_PREALLOC_IOSTAT_CTXS,
+ bio_iostat_ctx_cache);
+ if (!bio_iostat_ctx_pool)
+ goto fail_free_cache;
+ return 0;
+
+fail_free_cache:
+ kmem_cache_destroy(bio_iostat_ctx_cache);
+fail:
+ return -ENOMEM;
+}
+
+void f2fs_destroy_iostat_processing(void)
+{
+ mempool_destroy(bio_iostat_ctx_pool);
+ kmem_cache_destroy(bio_iostat_ctx_cache);
+}
+
+int f2fs_init_iostat(struct f2fs_sb_info *sbi)
+{
+ /* init iostat info */
+ spin_lock_init(&sbi->iostat_lock);
+ spin_lock_init(&sbi->iostat_lat_lock);
+ sbi->iostat_enable = false;
+ sbi->iostat_period_ms = DEFAULT_IOSTAT_PERIOD_MS;
+ sbi->iostat_io_lat = f2fs_kzalloc(sbi, sizeof(struct iostat_lat_info),
+ GFP_KERNEL);
+ if (!sbi->iostat_io_lat)
+ return -ENOMEM;
+
+ return 0;
+}
+
+void f2fs_destroy_iostat(struct f2fs_sb_info *sbi)
+{
+ kfree(sbi->iostat_io_lat);
+}