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xfs: bound maximum wait time for inodegc work

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Currently inodegc work can sit queued on the per-cpu queue until
the workqueue is either flushed of the queue reaches a depth that
triggers work queuing (and later throttling). This means that we
could queue work that waits for a long time for some other event to
trigger flushing.

Hence instead of just queueing work at a specific depth, use a
delayed work that queues the work at a bound time. We can still
schedule the work immediately at a given depth, but we no long need
to worry about leaving a number of items on the list that won't get
processed until external events prevail.

Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Signed-off-by: Darrick J. Wong <djwong@kernel.org>
This commit is contained in:
Dave Chinner 2022-06-16 07:44:31 -07:00 committed by Darrick J. Wong
parent e89ab76d7e
commit 7cf2b0f961
3 changed files with 24 additions and 16 deletions
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36
fs/xfs/xfs_icache.c
View file

@ -440,7 +440,7 @@ xfs_inodegc_queue_all(
for_each_online_cpu(cpu) {
gc = per_cpu_ptr(mp->m_inodegc, cpu);
if (!llist_empty(&gc->list))
queue_work_on(cpu, mp->m_inodegc_wq, &gc->work);
mod_delayed_work_on(cpu, mp->m_inodegc_wq, &gc->work, 0);
}
}
@ -1841,8 +1841,8 @@ void
xfs_inodegc_worker(
struct work_struct *work)
{
struct xfs_inodegc *gc = container_of(work, struct xfs_inodegc,
work);
struct xfs_inodegc *gc = container_of(to_delayed_work(work),
struct xfs_inodegc, work);
struct llist_node *node = llist_del_all(&gc->list);
struct xfs_inode *ip, *n;
@ -2014,6 +2014,7 @@ xfs_inodegc_queue(
struct xfs_inodegc *gc;
int items;
unsigned int shrinker_hits;
unsigned long queue_delay = 1;
trace_xfs_inode_set_need_inactive(ip);
spin_lock(&ip->i_flags_lock);
@ -2025,19 +2026,26 @@ xfs_inodegc_queue(
items = READ_ONCE(gc->items);
WRITE_ONCE(gc->items, items + 1);
shrinker_hits = READ_ONCE(gc->shrinker_hits);
put_cpu_ptr(gc);
if (!xfs_is_inodegc_enabled(mp))
/*
* We queue the work while holding the current CPU so that the work
* is scheduled to run on this CPU.
*/
if (!xfs_is_inodegc_enabled(mp)) {
put_cpu_ptr(gc);
return;
if (xfs_inodegc_want_queue_work(ip, items)) {
trace_xfs_inodegc_queue(mp, __return_address);
queue_work(mp->m_inodegc_wq, &gc->work);
}
if (xfs_inodegc_want_queue_work(ip, items))
queue_delay = 0;
trace_xfs_inodegc_queue(mp, __return_address);
mod_delayed_work(mp->m_inodegc_wq, &gc->work, queue_delay);
put_cpu_ptr(gc);
if (xfs_inodegc_want_flush_work(ip, items, shrinker_hits)) {
trace_xfs_inodegc_throttle(mp, __return_address);
flush_work(&gc->work);
flush_delayed_work(&gc->work);
}
}
@ -2054,7 +2062,7 @@ xfs_inodegc_cpu_dead(
unsigned int count = 0;
dead_gc = per_cpu_ptr(mp->m_inodegc, dead_cpu);
cancel_work_sync(&dead_gc->work);
cancel_delayed_work_sync(&dead_gc->work);
if (llist_empty(&dead_gc->list))
return;
@ -2073,12 +2081,12 @@ xfs_inodegc_cpu_dead(
llist_add_batch(first, last, &gc->list);
count += READ_ONCE(gc->items);
WRITE_ONCE(gc->items, count);
put_cpu_ptr(gc);
if (xfs_is_inodegc_enabled(mp)) {
trace_xfs_inodegc_queue(mp, __return_address);
queue_work(mp->m_inodegc_wq, &gc->work);
mod_delayed_work(mp->m_inodegc_wq, &gc->work, 0);
}
put_cpu_ptr(gc);
}
/*
@ -2173,7 +2181,7 @@ xfs_inodegc_shrinker_scan(
unsigned int h = READ_ONCE(gc->shrinker_hits);
WRITE_ONCE(gc->shrinker_hits, h + 1);
queue_work_on(cpu, mp->m_inodegc_wq, &gc->work);
mod_delayed_work_on(cpu, mp->m_inodegc_wq, &gc->work, 0);
no_items = false;
}
}

2
fs/xfs/xfs_mount.h
View file

@ -61,7 +61,7 @@ struct xfs_error_cfg {
*/
struct xfs_inodegc {
struct llist_head list;
struct work_struct work;
struct delayed_work work;
/* approximate count of inodes in the list */
unsigned int items;

2
fs/xfs/xfs_super.c
View file

@ -1074,7 +1074,7 @@ xfs_inodegc_init_percpu(
gc = per_cpu_ptr(mp->m_inodegc, cpu);
init_llist_head(&gc->list);
gc->items = 0;
INIT_WORK(&gc->work, xfs_inodegc_worker);
INIT_DELAYED_WORK(&gc->work, xfs_inodegc_worker);
}
return 0;
}