325 lines
8.7 KiB
C
325 lines
8.7 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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/*
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* f2fs iostat support
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*
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* Copyright 2021 Google LLC
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* Author: Daeho Jeong <daehojeong@google.com>
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*/
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#include <linux/fs.h>
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#include <linux/f2fs_fs.h>
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#include <linux/seq_file.h>
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#include "f2fs.h"
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#include "iostat.h"
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#include <trace/events/f2fs.h>
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#define NUM_PREALLOC_IOSTAT_CTXS 128
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static struct kmem_cache *bio_iostat_ctx_cache;
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static mempool_t *bio_iostat_ctx_pool;
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int __maybe_unused iostat_info_seq_show(struct seq_file *seq, void *offset)
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{
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struct super_block *sb = seq->private;
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struct f2fs_sb_info *sbi = F2FS_SB(sb);
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time64_t now = ktime_get_real_seconds();
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if (!sbi->iostat_enable)
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return 0;
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seq_printf(seq, "time: %-16llu\n", now);
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/* print app write IOs */
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seq_puts(seq, "[WRITE]\n");
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seq_printf(seq, "app buffered data: %-16llu\n",
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sbi->rw_iostat[APP_BUFFERED_IO]);
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seq_printf(seq, "app direct data: %-16llu\n",
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sbi->rw_iostat[APP_DIRECT_IO]);
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seq_printf(seq, "app mapped data: %-16llu\n",
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sbi->rw_iostat[APP_MAPPED_IO]);
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seq_printf(seq, "app buffered cdata: %-16llu\n",
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sbi->rw_iostat[APP_BUFFERED_CDATA_IO]);
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seq_printf(seq, "app mapped cdata: %-16llu\n",
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sbi->rw_iostat[APP_MAPPED_CDATA_IO]);
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/* print fs write IOs */
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seq_printf(seq, "fs data: %-16llu\n",
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sbi->rw_iostat[FS_DATA_IO]);
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seq_printf(seq, "fs cdata: %-16llu\n",
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sbi->rw_iostat[FS_CDATA_IO]);
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seq_printf(seq, "fs node: %-16llu\n",
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sbi->rw_iostat[FS_NODE_IO]);
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seq_printf(seq, "fs meta: %-16llu\n",
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sbi->rw_iostat[FS_META_IO]);
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seq_printf(seq, "fs gc data: %-16llu\n",
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sbi->rw_iostat[FS_GC_DATA_IO]);
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seq_printf(seq, "fs gc node: %-16llu\n",
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sbi->rw_iostat[FS_GC_NODE_IO]);
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seq_printf(seq, "fs cp data: %-16llu\n",
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sbi->rw_iostat[FS_CP_DATA_IO]);
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seq_printf(seq, "fs cp node: %-16llu\n",
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sbi->rw_iostat[FS_CP_NODE_IO]);
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seq_printf(seq, "fs cp meta: %-16llu\n",
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sbi->rw_iostat[FS_CP_META_IO]);
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/* print app read IOs */
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seq_puts(seq, "[READ]\n");
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seq_printf(seq, "app buffered data: %-16llu\n",
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sbi->rw_iostat[APP_BUFFERED_READ_IO]);
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seq_printf(seq, "app direct data: %-16llu\n",
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sbi->rw_iostat[APP_DIRECT_READ_IO]);
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seq_printf(seq, "app mapped data: %-16llu\n",
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sbi->rw_iostat[APP_MAPPED_READ_IO]);
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seq_printf(seq, "app buffered cdata: %-16llu\n",
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sbi->rw_iostat[APP_BUFFERED_CDATA_READ_IO]);
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seq_printf(seq, "app mapped cdata: %-16llu\n",
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sbi->rw_iostat[APP_MAPPED_CDATA_READ_IO]);
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/* print fs read IOs */
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seq_printf(seq, "fs data: %-16llu\n",
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sbi->rw_iostat[FS_DATA_READ_IO]);
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seq_printf(seq, "fs gc data: %-16llu\n",
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sbi->rw_iostat[FS_GDATA_READ_IO]);
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seq_printf(seq, "fs cdata: %-16llu\n",
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sbi->rw_iostat[FS_CDATA_READ_IO]);
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seq_printf(seq, "fs node: %-16llu\n",
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sbi->rw_iostat[FS_NODE_READ_IO]);
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seq_printf(seq, "fs meta: %-16llu\n",
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sbi->rw_iostat[FS_META_READ_IO]);
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/* print other IOs */
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seq_puts(seq, "[OTHER]\n");
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seq_printf(seq, "fs discard: %-16llu\n",
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sbi->rw_iostat[FS_DISCARD]);
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return 0;
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}
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static inline void __record_iostat_latency(struct f2fs_sb_info *sbi)
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{
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int io, idx = 0;
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unsigned int cnt;
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struct f2fs_iostat_latency iostat_lat[MAX_IO_TYPE][NR_PAGE_TYPE];
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struct iostat_lat_info *io_lat = sbi->iostat_io_lat;
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unsigned long flags;
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spin_lock_irqsave(&sbi->iostat_lat_lock, flags);
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for (idx = 0; idx < MAX_IO_TYPE; idx++) {
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for (io = 0; io < NR_PAGE_TYPE; io++) {
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cnt = io_lat->bio_cnt[idx][io];
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iostat_lat[idx][io].peak_lat =
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jiffies_to_msecs(io_lat->peak_lat[idx][io]);
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iostat_lat[idx][io].cnt = cnt;
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iostat_lat[idx][io].avg_lat = cnt ?
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jiffies_to_msecs(io_lat->sum_lat[idx][io]) / cnt : 0;
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io_lat->sum_lat[idx][io] = 0;
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io_lat->peak_lat[idx][io] = 0;
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io_lat->bio_cnt[idx][io] = 0;
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}
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}
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spin_unlock_irqrestore(&sbi->iostat_lat_lock, flags);
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trace_f2fs_iostat_latency(sbi, iostat_lat);
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}
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static inline void f2fs_record_iostat(struct f2fs_sb_info *sbi)
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{
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unsigned long long iostat_diff[NR_IO_TYPE];
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int i;
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unsigned long flags;
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if (time_is_after_jiffies(sbi->iostat_next_period))
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return;
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/* Need double check under the lock */
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spin_lock_irqsave(&sbi->iostat_lock, flags);
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if (time_is_after_jiffies(sbi->iostat_next_period)) {
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spin_unlock_irqrestore(&sbi->iostat_lock, flags);
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return;
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}
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sbi->iostat_next_period = jiffies +
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msecs_to_jiffies(sbi->iostat_period_ms);
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for (i = 0; i < NR_IO_TYPE; i++) {
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iostat_diff[i] = sbi->rw_iostat[i] -
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sbi->prev_rw_iostat[i];
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sbi->prev_rw_iostat[i] = sbi->rw_iostat[i];
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}
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spin_unlock_irqrestore(&sbi->iostat_lock, flags);
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trace_f2fs_iostat(sbi, iostat_diff);
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__record_iostat_latency(sbi);
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}
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void f2fs_reset_iostat(struct f2fs_sb_info *sbi)
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{
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struct iostat_lat_info *io_lat = sbi->iostat_io_lat;
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int i;
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spin_lock_irq(&sbi->iostat_lock);
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for (i = 0; i < NR_IO_TYPE; i++) {
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sbi->rw_iostat[i] = 0;
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sbi->prev_rw_iostat[i] = 0;
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}
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spin_unlock_irq(&sbi->iostat_lock);
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spin_lock_irq(&sbi->iostat_lat_lock);
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memset(io_lat, 0, sizeof(struct iostat_lat_info));
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spin_unlock_irq(&sbi->iostat_lat_lock);
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}
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void f2fs_update_iostat(struct f2fs_sb_info *sbi, struct inode *inode,
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enum iostat_type type, unsigned long long io_bytes)
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{
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unsigned long flags;
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if (!sbi->iostat_enable)
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return;
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spin_lock_irqsave(&sbi->iostat_lock, flags);
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sbi->rw_iostat[type] += io_bytes;
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if (type == APP_BUFFERED_IO || type == APP_DIRECT_IO)
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sbi->rw_iostat[APP_WRITE_IO] += io_bytes;
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if (type == APP_BUFFERED_READ_IO || type == APP_DIRECT_READ_IO)
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sbi->rw_iostat[APP_READ_IO] += io_bytes;
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#ifdef CONFIG_F2FS_FS_COMPRESSION
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if (inode && f2fs_compressed_file(inode)) {
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if (type == APP_BUFFERED_IO)
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sbi->rw_iostat[APP_BUFFERED_CDATA_IO] += io_bytes;
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if (type == APP_BUFFERED_READ_IO)
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sbi->rw_iostat[APP_BUFFERED_CDATA_READ_IO] += io_bytes;
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if (type == APP_MAPPED_READ_IO)
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sbi->rw_iostat[APP_MAPPED_CDATA_READ_IO] += io_bytes;
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if (type == APP_MAPPED_IO)
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sbi->rw_iostat[APP_MAPPED_CDATA_IO] += io_bytes;
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if (type == FS_DATA_READ_IO)
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sbi->rw_iostat[FS_CDATA_READ_IO] += io_bytes;
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if (type == FS_DATA_IO)
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sbi->rw_iostat[FS_CDATA_IO] += io_bytes;
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}
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#endif
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spin_unlock_irqrestore(&sbi->iostat_lock, flags);
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f2fs_record_iostat(sbi);
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}
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static inline void __update_iostat_latency(struct bio_iostat_ctx *iostat_ctx,
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int rw, bool is_sync)
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{
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unsigned long ts_diff;
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unsigned int iotype = iostat_ctx->type;
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struct f2fs_sb_info *sbi = iostat_ctx->sbi;
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struct iostat_lat_info *io_lat = sbi->iostat_io_lat;
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int idx;
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unsigned long flags;
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if (!sbi->iostat_enable)
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return;
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ts_diff = jiffies - iostat_ctx->submit_ts;
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if (iotype == META_FLUSH) {
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iotype = META;
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} else if (iotype >= NR_PAGE_TYPE) {
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f2fs_warn(sbi, "%s: %d over NR_PAGE_TYPE", __func__, iotype);
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return;
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}
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if (rw == 0) {
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idx = READ_IO;
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} else {
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if (is_sync)
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idx = WRITE_SYNC_IO;
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else
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idx = WRITE_ASYNC_IO;
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}
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spin_lock_irqsave(&sbi->iostat_lat_lock, flags);
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io_lat->sum_lat[idx][iotype] += ts_diff;
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io_lat->bio_cnt[idx][iotype]++;
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if (ts_diff > io_lat->peak_lat[idx][iotype])
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io_lat->peak_lat[idx][iotype] = ts_diff;
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spin_unlock_irqrestore(&sbi->iostat_lat_lock, flags);
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}
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void iostat_update_and_unbind_ctx(struct bio *bio, int rw)
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{
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struct bio_iostat_ctx *iostat_ctx = bio->bi_private;
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bool is_sync = bio->bi_opf & REQ_SYNC;
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if (rw == 0)
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bio->bi_private = iostat_ctx->post_read_ctx;
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else
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bio->bi_private = iostat_ctx->sbi;
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__update_iostat_latency(iostat_ctx, rw, is_sync);
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mempool_free(iostat_ctx, bio_iostat_ctx_pool);
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}
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void iostat_alloc_and_bind_ctx(struct f2fs_sb_info *sbi,
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struct bio *bio, struct bio_post_read_ctx *ctx)
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{
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struct bio_iostat_ctx *iostat_ctx;
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/* Due to the mempool, this never fails. */
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iostat_ctx = mempool_alloc(bio_iostat_ctx_pool, GFP_NOFS);
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iostat_ctx->sbi = sbi;
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iostat_ctx->submit_ts = 0;
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iostat_ctx->type = 0;
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iostat_ctx->post_read_ctx = ctx;
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bio->bi_private = iostat_ctx;
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}
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int __init f2fs_init_iostat_processing(void)
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{
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bio_iostat_ctx_cache =
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kmem_cache_create("f2fs_bio_iostat_ctx",
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sizeof(struct bio_iostat_ctx), 0, 0, NULL);
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if (!bio_iostat_ctx_cache)
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goto fail;
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bio_iostat_ctx_pool =
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mempool_create_slab_pool(NUM_PREALLOC_IOSTAT_CTXS,
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bio_iostat_ctx_cache);
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if (!bio_iostat_ctx_pool)
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goto fail_free_cache;
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return 0;
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fail_free_cache:
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kmem_cache_destroy(bio_iostat_ctx_cache);
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fail:
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return -ENOMEM;
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}
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void f2fs_destroy_iostat_processing(void)
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{
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mempool_destroy(bio_iostat_ctx_pool);
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kmem_cache_destroy(bio_iostat_ctx_cache);
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}
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int f2fs_init_iostat(struct f2fs_sb_info *sbi)
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{
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/* init iostat info */
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spin_lock_init(&sbi->iostat_lock);
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spin_lock_init(&sbi->iostat_lat_lock);
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sbi->iostat_enable = false;
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sbi->iostat_period_ms = DEFAULT_IOSTAT_PERIOD_MS;
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sbi->iostat_io_lat = f2fs_kzalloc(sbi, sizeof(struct iostat_lat_info),
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GFP_KERNEL);
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if (!sbi->iostat_io_lat)
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return -ENOMEM;
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return 0;
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}
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void f2fs_destroy_iostat(struct f2fs_sb_info *sbi)
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{
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kfree(sbi->iostat_io_lat);
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}
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