[XFS] On-demand reaping of the MRU cache
Instead of running the mru cache reaper all the time based on a timeout,
we should only run it when the cache has active objects. This allows CPUs
to sleep when there is no activity rather than be woken repeatedly just to
check if there is anything to do.
SGI-PV: 968554
SGI-Modid: xfs-linux-melb:xfs-kern:29305a
Signed-off-by: David Chinner <dgc@sgi.com>
Signed-off-by: Donald Douwsma <donaldd@sgi.com>
Signed-off-by: Tim Shimmin <tes@sgi.com>
diff --git a/fs/xfs/xfs_mru_cache.c b/fs/xfs/xfs_mru_cache.c
index 7deb9e3..e0b358c 100644
--- a/fs/xfs/xfs_mru_cache.c
+++ b/fs/xfs/xfs_mru_cache.c
@@ -206,8 +206,11 @@
*/
if (!_xfs_mru_cache_migrate(mru, now)) {
mru->time_zero = now;
- if (!mru->next_reap)
- mru->next_reap = mru->grp_count * mru->grp_time;
+ if (!mru->queued) {
+ mru->queued = 1;
+ queue_delayed_work(xfs_mru_reap_wq, &mru->work,
+ mru->grp_count * mru->grp_time);
+ }
} else {
grp = (now - mru->time_zero) / mru->grp_time;
grp = (mru->lru_grp + grp) % mru->grp_count;
@@ -271,29 +274,26 @@
struct work_struct *work)
{
xfs_mru_cache_t *mru = container_of(work, xfs_mru_cache_t, work.work);
- unsigned long now;
+ unsigned long now, next;
ASSERT(mru && mru->lists);
if (!mru || !mru->lists)
return;
mutex_spinlock(&mru->lock);
- now = jiffies;
- if (mru->reap_all ||
- (mru->next_reap && time_after(now, mru->next_reap))) {
- if (mru->reap_all)
- now += mru->grp_count * mru->grp_time * 2;
- mru->next_reap = _xfs_mru_cache_migrate(mru, now);
- _xfs_mru_cache_clear_reap_list(mru);
+ next = _xfs_mru_cache_migrate(mru, jiffies);
+ _xfs_mru_cache_clear_reap_list(mru);
+
+ mru->queued = next;
+ if ((mru->queued > 0)) {
+ now = jiffies;
+ if (next <= now)
+ next = 0;
+ else
+ next -= now;
+ queue_delayed_work(xfs_mru_reap_wq, &mru->work, next);
}
- /*
- * the process that triggered the reap_all is responsible
- * for restating the periodic reap if it is required.
- */
- if (!mru->reap_all)
- queue_delayed_work(xfs_mru_reap_wq, &mru->work, mru->grp_time);
- mru->reap_all = 0;
mutex_spinunlock(&mru->lock, 0);
}
@@ -352,7 +352,7 @@
/* An extra list is needed to avoid reaping up to a grp_time early. */
mru->grp_count = grp_count + 1;
- mru->lists = kmem_alloc(mru->grp_count * sizeof(*mru->lists), KM_SLEEP);
+ mru->lists = kmem_zalloc(mru->grp_count * sizeof(*mru->lists), KM_SLEEP);
if (!mru->lists) {
err = ENOMEM;
@@ -374,11 +374,6 @@
mru->grp_time = grp_time;
mru->free_func = free_func;
- /* start up the reaper event */
- mru->next_reap = 0;
- mru->reap_all = 0;
- queue_delayed_work(xfs_mru_reap_wq, &mru->work, mru->grp_time);
-
*mrup = mru;
exit:
@@ -394,35 +389,25 @@
* Call xfs_mru_cache_flush() to flush out all cached entries, calling their
* free functions as they're deleted. When this function returns, the caller is
* guaranteed that all the free functions for all the elements have finished
- * executing.
- *
- * While we are flushing, we stop the periodic reaper event from triggering.
- * Normally, we want to restart this periodic event, but if we are shutting
- * down the cache we do not want it restarted. hence the restart parameter
- * where 0 = do not restart reaper and 1 = restart reaper.
+ * executing and the reaper is not running.
*/
void
xfs_mru_cache_flush(
- xfs_mru_cache_t *mru,
- int restart)
+ xfs_mru_cache_t *mru)
{
if (!mru || !mru->lists)
return;
- cancel_rearming_delayed_workqueue(xfs_mru_reap_wq, &mru->work);
-
mutex_spinlock(&mru->lock);
- mru->reap_all = 1;
- mutex_spinunlock(&mru->lock, 0);
+ if (mru->queued) {
+ mutex_spinunlock(&mru->lock, 0);
+ cancel_rearming_delayed_workqueue(xfs_mru_reap_wq, &mru->work);
+ mutex_spinlock(&mru->lock);
+ }
- queue_work(xfs_mru_reap_wq, &mru->work.work);
- flush_workqueue(xfs_mru_reap_wq);
+ _xfs_mru_cache_migrate(mru, jiffies + mru->grp_count * mru->grp_time);
+ _xfs_mru_cache_clear_reap_list(mru);
- mutex_spinlock(&mru->lock);
- WARN_ON_ONCE(mru->reap_all != 0);
- mru->reap_all = 0;
- if (restart)
- queue_delayed_work(xfs_mru_reap_wq, &mru->work, mru->grp_time);
mutex_spinunlock(&mru->lock, 0);
}
@@ -433,8 +418,7 @@
if (!mru || !mru->lists)
return;
- /* we don't want the reaper to restart here */
- xfs_mru_cache_flush(mru, 0);
+ xfs_mru_cache_flush(mru);
kmem_free(mru->lists, mru->grp_count * sizeof(*mru->lists));
kmem_free(mru, sizeof(*mru));
