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![Damien Le Moal](/assets/img/avatar_default.png)
Only triggering reclaim based on the percentage of unmapped cache zones can fail to detect cases where reclaim is needed, e.g. if the target has only 2 or 3 cache zones and only one unmapped cache zone, the percentage of free cache zones is higher than DMZ_RECLAIM_LOW_UNMAP_ZONES (30%) and reclaim does not trigger. This problem, combined with the fact that dmz_schedule_reclaim() is called from dmz_handle_bio() without the map lock held, leads to a race between zone allocation and dmz_should_reclaim() result. Depending on the workload applied, this race can lead to the write path waiting forever for a free zone without reclaim being triggered. Fix this by moving dmz_schedule_reclaim() inside dmz_alloc_zone() under the map lock. This results in checking the need for zone reclaim whenever a new data or buffer zone needs to be allocated. Also fix dmz_reclaim_percentage() to always return 0 if the number of unmapped cache (or random) zones is less than or equal to 1. Suggested-by: Shin'ichiro Kawasaki <shinichiro.kawasaki@wdc.com> Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com> Reviewed-by: Hannes Reinecke <hare@suse.de> Signed-off-by: Mike Snitzer <snitzer@redhat.com>
640 lines
15 KiB
C
640 lines
15 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (C) 2017 Western Digital Corporation or its affiliates.
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*
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* This file is released under the GPL.
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*/
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#include "dm-zoned.h"
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#include <linux/module.h>
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#define DM_MSG_PREFIX "zoned reclaim"
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struct dmz_reclaim {
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struct dmz_metadata *metadata;
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struct delayed_work work;
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struct workqueue_struct *wq;
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struct dm_kcopyd_client *kc;
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struct dm_kcopyd_throttle kc_throttle;
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int kc_err;
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int dev_idx;
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unsigned long flags;
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/* Last target access time */
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unsigned long atime;
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};
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/*
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* Reclaim state flags.
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*/
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enum {
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DMZ_RECLAIM_KCOPY,
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};
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/*
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* Number of seconds of target BIO inactivity to consider the target idle.
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*/
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#define DMZ_IDLE_PERIOD (10UL * HZ)
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/*
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* Percentage of unmapped (free) random zones below which reclaim starts
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* even if the target is busy.
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*/
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#define DMZ_RECLAIM_LOW_UNMAP_ZONES 30
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/*
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* Percentage of unmapped (free) random zones above which reclaim will
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* stop if the target is busy.
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*/
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#define DMZ_RECLAIM_HIGH_UNMAP_ZONES 50
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/*
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* Align a sequential zone write pointer to chunk_block.
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*/
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static int dmz_reclaim_align_wp(struct dmz_reclaim *zrc, struct dm_zone *zone,
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sector_t block)
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{
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struct dmz_metadata *zmd = zrc->metadata;
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struct dmz_dev *dev = zone->dev;
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sector_t wp_block = zone->wp_block;
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unsigned int nr_blocks;
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int ret;
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if (wp_block == block)
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return 0;
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if (wp_block > block)
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return -EIO;
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/*
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* Zeroout the space between the write
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* pointer and the requested position.
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*/
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nr_blocks = block - wp_block;
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ret = blkdev_issue_zeroout(dev->bdev,
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dmz_start_sect(zmd, zone) + dmz_blk2sect(wp_block),
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dmz_blk2sect(nr_blocks), GFP_NOIO, 0);
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if (ret) {
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dmz_dev_err(dev,
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"Align zone %u wp %llu to %llu (wp+%u) blocks failed %d",
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zone->id, (unsigned long long)wp_block,
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(unsigned long long)block, nr_blocks, ret);
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dmz_check_bdev(dev);
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return ret;
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}
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zone->wp_block = block;
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return 0;
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}
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/*
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* dm_kcopyd_copy end notification.
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*/
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static void dmz_reclaim_kcopy_end(int read_err, unsigned long write_err,
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void *context)
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{
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struct dmz_reclaim *zrc = context;
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if (read_err || write_err)
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zrc->kc_err = -EIO;
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else
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zrc->kc_err = 0;
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clear_bit_unlock(DMZ_RECLAIM_KCOPY, &zrc->flags);
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smp_mb__after_atomic();
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wake_up_bit(&zrc->flags, DMZ_RECLAIM_KCOPY);
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}
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/*
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* Copy valid blocks of src_zone into dst_zone.
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*/
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static int dmz_reclaim_copy(struct dmz_reclaim *zrc,
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struct dm_zone *src_zone, struct dm_zone *dst_zone)
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{
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struct dmz_metadata *zmd = zrc->metadata;
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struct dm_io_region src, dst;
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sector_t block = 0, end_block;
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sector_t nr_blocks;
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sector_t src_zone_block;
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sector_t dst_zone_block;
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unsigned long flags = 0;
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int ret;
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if (dmz_is_seq(src_zone))
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end_block = src_zone->wp_block;
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else
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end_block = dmz_zone_nr_blocks(zmd);
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src_zone_block = dmz_start_block(zmd, src_zone);
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dst_zone_block = dmz_start_block(zmd, dst_zone);
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if (dmz_is_seq(dst_zone))
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set_bit(DM_KCOPYD_WRITE_SEQ, &flags);
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while (block < end_block) {
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if (src_zone->dev->flags & DMZ_BDEV_DYING)
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return -EIO;
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if (dst_zone->dev->flags & DMZ_BDEV_DYING)
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return -EIO;
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if (dmz_reclaim_should_terminate(src_zone))
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return -EINTR;
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/* Get a valid region from the source zone */
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ret = dmz_first_valid_block(zmd, src_zone, &block);
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if (ret <= 0)
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return ret;
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nr_blocks = ret;
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/*
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* If we are writing in a sequential zone, we must make sure
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* that writes are sequential. So Zeroout any eventual hole
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* between writes.
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*/
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if (dmz_is_seq(dst_zone)) {
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ret = dmz_reclaim_align_wp(zrc, dst_zone, block);
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if (ret)
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return ret;
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}
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src.bdev = src_zone->dev->bdev;
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src.sector = dmz_blk2sect(src_zone_block + block);
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src.count = dmz_blk2sect(nr_blocks);
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dst.bdev = dst_zone->dev->bdev;
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dst.sector = dmz_blk2sect(dst_zone_block + block);
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dst.count = src.count;
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/* Copy the valid region */
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set_bit(DMZ_RECLAIM_KCOPY, &zrc->flags);
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dm_kcopyd_copy(zrc->kc, &src, 1, &dst, flags,
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dmz_reclaim_kcopy_end, zrc);
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/* Wait for copy to complete */
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wait_on_bit_io(&zrc->flags, DMZ_RECLAIM_KCOPY,
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TASK_UNINTERRUPTIBLE);
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if (zrc->kc_err)
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return zrc->kc_err;
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block += nr_blocks;
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if (dmz_is_seq(dst_zone))
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dst_zone->wp_block = block;
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}
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return 0;
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}
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/*
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* Move valid blocks of dzone buffer zone into dzone (after its write pointer)
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* and free the buffer zone.
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*/
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static int dmz_reclaim_buf(struct dmz_reclaim *zrc, struct dm_zone *dzone)
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{
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struct dm_zone *bzone = dzone->bzone;
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sector_t chunk_block = dzone->wp_block;
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struct dmz_metadata *zmd = zrc->metadata;
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int ret;
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DMDEBUG("(%s/%u): Chunk %u, move buf zone %u (weight %u) to data zone %u (weight %u)",
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dmz_metadata_label(zmd), zrc->dev_idx,
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dzone->chunk, bzone->id, dmz_weight(bzone),
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dzone->id, dmz_weight(dzone));
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/* Flush data zone into the buffer zone */
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ret = dmz_reclaim_copy(zrc, bzone, dzone);
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if (ret < 0)
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return ret;
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dmz_lock_flush(zmd);
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/* Validate copied blocks */
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ret = dmz_merge_valid_blocks(zmd, bzone, dzone, chunk_block);
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if (ret == 0) {
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/* Free the buffer zone */
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dmz_invalidate_blocks(zmd, bzone, 0, dmz_zone_nr_blocks(zmd));
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dmz_lock_map(zmd);
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dmz_unmap_zone(zmd, bzone);
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dmz_unlock_zone_reclaim(dzone);
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dmz_free_zone(zmd, bzone);
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dmz_unlock_map(zmd);
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}
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dmz_unlock_flush(zmd);
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return ret;
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}
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/*
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* Merge valid blocks of dzone into its buffer zone and free dzone.
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*/
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static int dmz_reclaim_seq_data(struct dmz_reclaim *zrc, struct dm_zone *dzone)
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{
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unsigned int chunk = dzone->chunk;
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struct dm_zone *bzone = dzone->bzone;
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struct dmz_metadata *zmd = zrc->metadata;
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int ret = 0;
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DMDEBUG("(%s/%u): Chunk %u, move data zone %u (weight %u) to buf zone %u (weight %u)",
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dmz_metadata_label(zmd), zrc->dev_idx,
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chunk, dzone->id, dmz_weight(dzone),
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bzone->id, dmz_weight(bzone));
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/* Flush data zone into the buffer zone */
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ret = dmz_reclaim_copy(zrc, dzone, bzone);
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if (ret < 0)
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return ret;
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dmz_lock_flush(zmd);
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/* Validate copied blocks */
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ret = dmz_merge_valid_blocks(zmd, dzone, bzone, 0);
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if (ret == 0) {
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/*
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* Free the data zone and remap the chunk to
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* the buffer zone.
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*/
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dmz_invalidate_blocks(zmd, dzone, 0, dmz_zone_nr_blocks(zmd));
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dmz_lock_map(zmd);
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dmz_unmap_zone(zmd, bzone);
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dmz_unmap_zone(zmd, dzone);
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dmz_unlock_zone_reclaim(dzone);
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dmz_free_zone(zmd, dzone);
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dmz_map_zone(zmd, bzone, chunk);
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dmz_unlock_map(zmd);
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}
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dmz_unlock_flush(zmd);
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return ret;
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}
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/*
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* Move valid blocks of the random data zone dzone into a free sequential zone.
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* Once blocks are moved, remap the zone chunk to the sequential zone.
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*/
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static int dmz_reclaim_rnd_data(struct dmz_reclaim *zrc, struct dm_zone *dzone)
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{
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unsigned int chunk = dzone->chunk;
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struct dm_zone *szone = NULL;
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struct dmz_metadata *zmd = zrc->metadata;
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int ret;
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int alloc_flags = DMZ_ALLOC_SEQ;
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/* Get a free random or sequential zone */
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dmz_lock_map(zmd);
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again:
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szone = dmz_alloc_zone(zmd, zrc->dev_idx,
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alloc_flags | DMZ_ALLOC_RECLAIM);
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if (!szone && alloc_flags == DMZ_ALLOC_SEQ && dmz_nr_cache_zones(zmd)) {
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alloc_flags = DMZ_ALLOC_RND;
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goto again;
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}
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dmz_unlock_map(zmd);
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if (!szone)
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return -ENOSPC;
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DMDEBUG("(%s/%u): Chunk %u, move %s zone %u (weight %u) to %s zone %u",
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dmz_metadata_label(zmd), zrc->dev_idx, chunk,
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dmz_is_cache(dzone) ? "cache" : "rnd",
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dzone->id, dmz_weight(dzone),
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dmz_is_rnd(szone) ? "rnd" : "seq", szone->id);
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/* Flush the random data zone into the sequential zone */
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ret = dmz_reclaim_copy(zrc, dzone, szone);
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dmz_lock_flush(zmd);
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if (ret == 0) {
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/* Validate copied blocks */
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ret = dmz_copy_valid_blocks(zmd, dzone, szone);
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}
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if (ret) {
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/* Free the sequential zone */
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dmz_lock_map(zmd);
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dmz_free_zone(zmd, szone);
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dmz_unlock_map(zmd);
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} else {
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/* Free the data zone and remap the chunk */
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dmz_invalidate_blocks(zmd, dzone, 0, dmz_zone_nr_blocks(zmd));
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dmz_lock_map(zmd);
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dmz_unmap_zone(zmd, dzone);
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dmz_unlock_zone_reclaim(dzone);
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dmz_free_zone(zmd, dzone);
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dmz_map_zone(zmd, szone, chunk);
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dmz_unlock_map(zmd);
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}
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dmz_unlock_flush(zmd);
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return ret;
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}
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/*
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* Reclaim an empty zone.
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*/
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static void dmz_reclaim_empty(struct dmz_reclaim *zrc, struct dm_zone *dzone)
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{
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struct dmz_metadata *zmd = zrc->metadata;
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dmz_lock_flush(zmd);
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dmz_lock_map(zmd);
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dmz_unmap_zone(zmd, dzone);
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dmz_unlock_zone_reclaim(dzone);
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dmz_free_zone(zmd, dzone);
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dmz_unlock_map(zmd);
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dmz_unlock_flush(zmd);
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}
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/*
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* Test if the target device is idle.
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*/
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static inline int dmz_target_idle(struct dmz_reclaim *zrc)
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{
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return time_is_before_jiffies(zrc->atime + DMZ_IDLE_PERIOD);
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}
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/*
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* Find a candidate zone for reclaim and process it.
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*/
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static int dmz_do_reclaim(struct dmz_reclaim *zrc)
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{
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struct dmz_metadata *zmd = zrc->metadata;
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struct dm_zone *dzone;
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struct dm_zone *rzone;
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unsigned long start;
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int ret;
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/* Get a data zone */
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dzone = dmz_get_zone_for_reclaim(zmd, zrc->dev_idx,
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dmz_target_idle(zrc));
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if (!dzone) {
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DMDEBUG("(%s/%u): No zone found to reclaim",
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dmz_metadata_label(zmd), zrc->dev_idx);
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return -EBUSY;
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}
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rzone = dzone;
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start = jiffies;
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if (dmz_is_cache(dzone) || dmz_is_rnd(dzone)) {
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if (!dmz_weight(dzone)) {
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/* Empty zone */
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dmz_reclaim_empty(zrc, dzone);
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ret = 0;
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} else {
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/*
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* Reclaim the random data zone by moving its
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* valid data blocks to a free sequential zone.
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*/
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ret = dmz_reclaim_rnd_data(zrc, dzone);
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}
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} else {
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struct dm_zone *bzone = dzone->bzone;
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sector_t chunk_block = 0;
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ret = dmz_first_valid_block(zmd, bzone, &chunk_block);
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if (ret < 0)
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goto out;
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if (ret == 0 || chunk_block >= dzone->wp_block) {
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/*
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* The buffer zone is empty or its valid blocks are
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* after the data zone write pointer.
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*/
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ret = dmz_reclaim_buf(zrc, dzone);
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rzone = bzone;
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} else {
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/*
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* Reclaim the data zone by merging it into the
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* buffer zone so that the buffer zone itself can
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* be later reclaimed.
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*/
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ret = dmz_reclaim_seq_data(zrc, dzone);
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}
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}
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out:
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if (ret) {
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if (ret == -EINTR)
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DMDEBUG("(%s/%u): reclaim zone %u interrupted",
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dmz_metadata_label(zmd), zrc->dev_idx,
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rzone->id);
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else
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DMDEBUG("(%s/%u): Failed to reclaim zone %u, err %d",
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dmz_metadata_label(zmd), zrc->dev_idx,
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rzone->id, ret);
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dmz_unlock_zone_reclaim(dzone);
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return ret;
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}
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ret = dmz_flush_metadata(zrc->metadata);
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if (ret) {
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DMDEBUG("(%s/%u): Metadata flush for zone %u failed, err %d",
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dmz_metadata_label(zmd), zrc->dev_idx, rzone->id, ret);
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return ret;
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}
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DMDEBUG("(%s/%u): Reclaimed zone %u in %u ms",
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dmz_metadata_label(zmd), zrc->dev_idx,
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rzone->id, jiffies_to_msecs(jiffies - start));
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return 0;
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}
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static unsigned int dmz_reclaim_percentage(struct dmz_reclaim *zrc)
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{
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struct dmz_metadata *zmd = zrc->metadata;
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unsigned int nr_cache = dmz_nr_cache_zones(zmd);
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unsigned int nr_unmap, nr_zones;
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if (nr_cache) {
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nr_zones = nr_cache;
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nr_unmap = dmz_nr_unmap_cache_zones(zmd);
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} else {
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nr_zones = dmz_nr_rnd_zones(zmd, zrc->dev_idx);
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nr_unmap = dmz_nr_unmap_rnd_zones(zmd, zrc->dev_idx);
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}
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if (nr_unmap <= 1)
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return 0;
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return nr_unmap * 100 / nr_zones;
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}
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/*
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* Test if reclaim is necessary.
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*/
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static bool dmz_should_reclaim(struct dmz_reclaim *zrc, unsigned int p_unmap)
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{
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unsigned int nr_reclaim;
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nr_reclaim = dmz_nr_rnd_zones(zrc->metadata, zrc->dev_idx);
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if (dmz_nr_cache_zones(zrc->metadata)) {
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/*
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* The first device in a multi-device
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* setup only contains cache zones, so
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* never start reclaim there.
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*/
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if (zrc->dev_idx == 0)
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return false;
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nr_reclaim += dmz_nr_cache_zones(zrc->metadata);
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}
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/* Reclaim when idle */
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if (dmz_target_idle(zrc) && nr_reclaim)
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return true;
|
|
|
|
/* If there are still plenty of cache zones, do not reclaim */
|
|
if (p_unmap >= DMZ_RECLAIM_HIGH_UNMAP_ZONES)
|
|
return false;
|
|
|
|
/*
|
|
* If the percentage of unmapped cache zones is low,
|
|
* reclaim even if the target is busy.
|
|
*/
|
|
return p_unmap <= DMZ_RECLAIM_LOW_UNMAP_ZONES;
|
|
}
|
|
|
|
/*
|
|
* Reclaim work function.
|
|
*/
|
|
static void dmz_reclaim_work(struct work_struct *work)
|
|
{
|
|
struct dmz_reclaim *zrc = container_of(work, struct dmz_reclaim, work.work);
|
|
struct dmz_metadata *zmd = zrc->metadata;
|
|
unsigned int p_unmap;
|
|
int ret;
|
|
|
|
if (dmz_dev_is_dying(zmd))
|
|
return;
|
|
|
|
p_unmap = dmz_reclaim_percentage(zrc);
|
|
if (!dmz_should_reclaim(zrc, p_unmap)) {
|
|
mod_delayed_work(zrc->wq, &zrc->work, DMZ_IDLE_PERIOD);
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* We need to start reclaiming random zones: set up zone copy
|
|
* throttling to either go fast if we are very low on random zones
|
|
* and slower if there are still some free random zones to avoid
|
|
* as much as possible to negatively impact the user workload.
|
|
*/
|
|
if (dmz_target_idle(zrc) || p_unmap < DMZ_RECLAIM_LOW_UNMAP_ZONES / 2) {
|
|
/* Idle or very low percentage: go fast */
|
|
zrc->kc_throttle.throttle = 100;
|
|
} else {
|
|
/* Busy but we still have some random zone: throttle */
|
|
zrc->kc_throttle.throttle = min(75U, 100U - p_unmap / 2);
|
|
}
|
|
|
|
DMDEBUG("(%s/%u): Reclaim (%u): %s, %u%% free zones (%u/%u cache %u/%u random)",
|
|
dmz_metadata_label(zmd), zrc->dev_idx,
|
|
zrc->kc_throttle.throttle,
|
|
(dmz_target_idle(zrc) ? "Idle" : "Busy"),
|
|
p_unmap, dmz_nr_unmap_cache_zones(zmd),
|
|
dmz_nr_cache_zones(zmd),
|
|
dmz_nr_unmap_rnd_zones(zmd, zrc->dev_idx),
|
|
dmz_nr_rnd_zones(zmd, zrc->dev_idx));
|
|
|
|
ret = dmz_do_reclaim(zrc);
|
|
if (ret && ret != -EINTR) {
|
|
if (!dmz_check_dev(zmd))
|
|
return;
|
|
}
|
|
|
|
dmz_schedule_reclaim(zrc);
|
|
}
|
|
|
|
/*
|
|
* Initialize reclaim.
|
|
*/
|
|
int dmz_ctr_reclaim(struct dmz_metadata *zmd,
|
|
struct dmz_reclaim **reclaim, int idx)
|
|
{
|
|
struct dmz_reclaim *zrc;
|
|
int ret;
|
|
|
|
zrc = kzalloc(sizeof(struct dmz_reclaim), GFP_KERNEL);
|
|
if (!zrc)
|
|
return -ENOMEM;
|
|
|
|
zrc->metadata = zmd;
|
|
zrc->atime = jiffies;
|
|
zrc->dev_idx = idx;
|
|
|
|
/* Reclaim kcopyd client */
|
|
zrc->kc = dm_kcopyd_client_create(&zrc->kc_throttle);
|
|
if (IS_ERR(zrc->kc)) {
|
|
ret = PTR_ERR(zrc->kc);
|
|
zrc->kc = NULL;
|
|
goto err;
|
|
}
|
|
|
|
/* Reclaim work */
|
|
INIT_DELAYED_WORK(&zrc->work, dmz_reclaim_work);
|
|
zrc->wq = alloc_ordered_workqueue("dmz_rwq_%s_%d", WQ_MEM_RECLAIM,
|
|
dmz_metadata_label(zmd), idx);
|
|
if (!zrc->wq) {
|
|
ret = -ENOMEM;
|
|
goto err;
|
|
}
|
|
|
|
*reclaim = zrc;
|
|
queue_delayed_work(zrc->wq, &zrc->work, 0);
|
|
|
|
return 0;
|
|
err:
|
|
if (zrc->kc)
|
|
dm_kcopyd_client_destroy(zrc->kc);
|
|
kfree(zrc);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Terminate reclaim.
|
|
*/
|
|
void dmz_dtr_reclaim(struct dmz_reclaim *zrc)
|
|
{
|
|
cancel_delayed_work_sync(&zrc->work);
|
|
destroy_workqueue(zrc->wq);
|
|
dm_kcopyd_client_destroy(zrc->kc);
|
|
kfree(zrc);
|
|
}
|
|
|
|
/*
|
|
* Suspend reclaim.
|
|
*/
|
|
void dmz_suspend_reclaim(struct dmz_reclaim *zrc)
|
|
{
|
|
cancel_delayed_work_sync(&zrc->work);
|
|
}
|
|
|
|
/*
|
|
* Resume reclaim.
|
|
*/
|
|
void dmz_resume_reclaim(struct dmz_reclaim *zrc)
|
|
{
|
|
queue_delayed_work(zrc->wq, &zrc->work, DMZ_IDLE_PERIOD);
|
|
}
|
|
|
|
/*
|
|
* BIO accounting.
|
|
*/
|
|
void dmz_reclaim_bio_acc(struct dmz_reclaim *zrc)
|
|
{
|
|
zrc->atime = jiffies;
|
|
}
|
|
|
|
/*
|
|
* Start reclaim if necessary.
|
|
*/
|
|
void dmz_schedule_reclaim(struct dmz_reclaim *zrc)
|
|
{
|
|
unsigned int p_unmap = dmz_reclaim_percentage(zrc);
|
|
|
|
if (dmz_should_reclaim(zrc, p_unmap))
|
|
mod_delayed_work(zrc->wq, &zrc->work, 0);
|
|
}
|