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xfs: parallelize block preallocation garbage collection

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Split the block preallocation garbage collection work into per-AG work
items so that we can take advantage of parallelization.

Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Darrick J. Wong 2021-01-22 16:48:44 -08:00
parent c9a6526fe7
commit 894ecacf0f
4 changed files with 38 additions and 16 deletions
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42
fs/xfs/xfs_icache.c
View File

@ -1333,12 +1333,12 @@ xfs_inode_free_eofblocks(
*/
static inline void
xfs_blockgc_queue(
struct xfs_mount *mp)
struct xfs_perag *pag)
{
rcu_read_lock();
if (radix_tree_tagged(&mp->m_perag_tree, XFS_ICI_BLOCKGC_TAG))
queue_delayed_work(mp->m_blockgc_workqueue,
&mp->m_blockgc_work,
if (radix_tree_tagged(&pag->pag_ici_root, XFS_ICI_BLOCKGC_TAG))
queue_delayed_work(pag->pag_mount->m_blockgc_workqueue,
&pag->pag_blockgc_work,
msecs_to_jiffies(xfs_blockgc_secs * 1000));
rcu_read_unlock();
}
@ -1380,7 +1380,7 @@ xfs_blockgc_set_iflag(
spin_unlock(&ip->i_mount->m_perag_lock);
/* kick off background trimming */
xfs_blockgc_queue(ip->i_mount);
xfs_blockgc_queue(pag);
trace_xfs_perag_set_blockgc(ip->i_mount, pag->pag_agno, -1,
_RET_IP_);
@ -1555,12 +1555,24 @@ xfs_inode_clear_cowblocks_tag(
return xfs_blockgc_clear_iflag(ip, XFS_ICOWBLOCKS);
}
#define for_each_perag_tag(mp, next_agno, pag, tag) \
for ((next_agno) = 0, (pag) = xfs_perag_get_tag((mp), 0, (tag)); \
(pag) != NULL; \
(next_agno) = (pag)->pag_agno + 1, \
xfs_perag_put(pag), \
(pag) = xfs_perag_get_tag((mp), (next_agno), (tag)))
/* Disable post-EOF and CoW block auto-reclamation. */
void
xfs_blockgc_stop(
struct xfs_mount *mp)
{
cancel_delayed_work_sync(&mp->m_blockgc_work);
struct xfs_perag *pag;
xfs_agnumber_t agno;
for_each_perag_tag(mp, agno, pag, XFS_ICI_BLOCKGC_TAG)
cancel_delayed_work_sync(&pag->pag_blockgc_work);
}
/* Enable post-EOF and CoW block auto-reclamation. */
@ -1568,7 +1580,11 @@ void
xfs_blockgc_start(
struct xfs_mount *mp)
{
xfs_blockgc_queue(mp);
struct xfs_perag *pag;
xfs_agnumber_t agno;
for_each_perag_tag(mp, agno, pag, XFS_ICI_BLOCKGC_TAG)
xfs_blockgc_queue(pag);
}
/* Scan one incore inode for block preallocations that we can remove. */
@ -1595,18 +1611,20 @@ void
xfs_blockgc_worker(
struct work_struct *work)
{
struct xfs_mount *mp = container_of(to_delayed_work(work),
struct xfs_mount, m_blockgc_work);
struct xfs_perag *pag = container_of(to_delayed_work(work),
struct xfs_perag, pag_blockgc_work);
struct xfs_mount *mp = pag->pag_mount;
int error;
if (!sb_start_write_trylock(mp->m_super))
return;
error = xfs_inode_walk(mp, 0, xfs_blockgc_scan_inode, NULL,
error = xfs_inode_walk_ag(pag, 0, xfs_blockgc_scan_inode, NULL,
XFS_ICI_BLOCKGC_TAG);
if (error)
xfs_info(mp, "preallocation gc worker failed, err=%d", error);
xfs_info(mp, "AG %u preallocation gc worker failed, err=%d",
pag->pag_agno, error);
sb_end_write(mp->m_super);
xfs_blockgc_queue(mp);
xfs_blockgc_queue(pag);
}
/*

3
fs/xfs/xfs_mount.c
View File

@ -126,6 +126,7 @@ __xfs_free_perag(
{
struct xfs_perag *pag = container_of(head, struct xfs_perag, rcu_head);
ASSERT(!delayed_work_pending(&pag->pag_blockgc_work));
ASSERT(atomic_read(&pag->pag_ref) == 0);
kmem_free(pag);
}
@ -146,6 +147,7 @@ xfs_free_perag(
spin_unlock(&mp->m_perag_lock);
ASSERT(pag);
ASSERT(atomic_read(&pag->pag_ref) == 0);
cancel_delayed_work_sync(&pag->pag_blockgc_work);
xfs_iunlink_destroy(pag);
xfs_buf_hash_destroy(pag);
call_rcu(&pag->rcu_head, __xfs_free_perag);
@ -201,6 +203,7 @@ xfs_initialize_perag(
pag->pag_agno = index;
pag->pag_mount = mp;
spin_lock_init(&pag->pag_ici_lock);
INIT_DELAYED_WORK(&pag->pag_blockgc_work, xfs_blockgc_worker);
INIT_RADIX_TREE(&pag->pag_ici_root, GFP_ATOMIC);
error = xfs_buf_hash_init(pag);

5
fs/xfs/xfs_mount.h
View File

@ -177,8 +177,6 @@ typedef struct xfs_mount {
uint64_t m_resblks_avail;/* available reserved blocks */
uint64_t m_resblks_save; /* reserved blks @ remount,ro */
struct delayed_work m_reclaim_work; /* background inode reclaim */
struct delayed_work m_blockgc_work; /* background prealloc blocks
trimming */
struct xfs_kobj m_kobj;
struct xfs_kobj m_error_kobj;
struct xfs_kobj m_error_meta_kobj;
@ -367,6 +365,9 @@ typedef struct xfs_perag {
/* Blocks reserved for the reverse mapping btree. */
struct xfs_ag_resv pag_rmapbt_resv;
/* background prealloc block trimming */
struct delayed_work pag_blockgc_work;
/* reference count */
uint8_t pagf_refcount_level;

4
fs/xfs/xfs_super.c
View File

@ -35,6 +35,7 @@
#include "xfs_refcount_item.h"
#include "xfs_bmap_item.h"
#include "xfs_reflink.h"
#include "xfs_pwork.h"
#include <linux/magic.h>
#include <linux/fs_context.h>
@ -519,7 +520,7 @@ xfs_init_mount_workqueues(
goto out_destroy_cil;
mp->m_blockgc_workqueue = alloc_workqueue("xfs-blockgc/%s",
XFS_WQFLAGS(WQ_FREEZABLE | WQ_MEM_RECLAIM),
XFS_WQFLAGS(WQ_UNBOUND | WQ_FREEZABLE | WQ_MEM_RECLAIM),
0, mp->m_super->s_id);
if (!mp->m_blockgc_workqueue)
goto out_destroy_reclaim;
@ -1842,7 +1843,6 @@ static int xfs_init_fs_context(
mutex_init(&mp->m_growlock);
INIT_WORK(&mp->m_flush_inodes_work, xfs_flush_inodes_worker);
INIT_DELAYED_WORK(&mp->m_reclaim_work, xfs_reclaim_worker);
INIT_DELAYED_WORK(&mp->m_blockgc_work, xfs_blockgc_worker);
mp->m_kobj.kobject.kset = xfs_kset;
/*
* We don't create the finobt per-ag space reservation until after log