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// 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);
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);
}
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