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Refactor txg history kstat

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It was observed that even when the txg history is disabled by
setting `zfs_txg_history=0` the txg_sync thread still fetches
the vdev stats unnecessarily.

This patch refactors the code such that vdev_get_stats() is no
longer called when `zfs_txg_history=0`.  And it further reduces
the  differences between upstream and the ZoL txg_sync_thread()
function.

Reviewed-by: Tony Hutter <hutter2@llnl.gov>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #5412
This commit is contained in:
Brian Behlendorf
2016-12-02 16:57:49 -07:00
committed by GitHub
parent 6c09d3e5a0
commit baf67d15a5
3 changed files with 65 additions and 34 deletions
Download Patch File Download Diff File Expand all files Collapse all files
module/zfs/txg.c
+6 -31
View File
@@ -481,22 +481,17 @@ txg_sync_thread(dsl_pool_t *dp)
spa_t *spa = dp->dp_spa;
tx_state_t *tx = &dp->dp_tx;
callb_cpr_t cpr;
vdev_stat_t *vs1, *vs2;
clock_t start, delta;
(void) spl_fstrans_mark();
txg_thread_enter(tx, &cpr);
vs1 = kmem_alloc(sizeof (vdev_stat_t), KM_SLEEP);
vs2 = kmem_alloc(sizeof (vdev_stat_t), KM_SLEEP);
start = delta = 0;
for (;;) {
clock_t timer, timeout;
clock_t timeout = zfs_txg_timeout * hz;
clock_t timer;
uint64_t txg;
uint64_t ndirty;
timeout = zfs_txg_timeout * hz;
txg_stat_t *ts;
/*
* We sync when we're scanning, there's someone waiting
@@ -527,15 +522,8 @@ txg_sync_thread(dsl_pool_t *dp)
txg_thread_wait(tx, &cpr, &tx->tx_quiesce_done_cv, 0);
}
if (tx->tx_exiting) {
kmem_free(vs2, sizeof (vdev_stat_t));
kmem_free(vs1, sizeof (vdev_stat_t));
if (tx->tx_exiting)
txg_thread_exit(tx, &cpr, &tx->tx_sync_thread);
}
spa_config_enter(spa, SCL_ALL, FTAG, RW_READER);
vdev_get_stats(spa->spa_root_vdev, vs1);
spa_config_exit(spa, SCL_ALL, FTAG);
/*
* Consume the quiesced txg which has been handed off to
@@ -546,16 +534,13 @@ txg_sync_thread(dsl_pool_t *dp)
tx->tx_quiesced_txg = 0;
tx->tx_syncing_txg = txg;
DTRACE_PROBE2(txg__syncing, dsl_pool_t *, dp, uint64_t, txg);
ts = spa_txg_history_init_io(spa, txg, dp);
cv_broadcast(&tx->tx_quiesce_more_cv);
dprintf("txg=%llu quiesce_txg=%llu sync_txg=%llu\n",
txg, tx->tx_quiesce_txg_waiting, tx->tx_sync_txg_waiting);
mutex_exit(&tx->tx_sync_lock);
spa_txg_history_set(spa, txg, TXG_STATE_WAIT_FOR_SYNC,
gethrtime());
ndirty = dp->dp_dirty_pertxg[txg & TXG_MASK];
start = ddi_get_lbolt();
spa_sync(spa, txg);
delta = ddi_get_lbolt() - start;
@@ -564,23 +549,13 @@ txg_sync_thread(dsl_pool_t *dp)
tx->tx_synced_txg = txg;
tx->tx_syncing_txg = 0;
DTRACE_PROBE2(txg__synced, dsl_pool_t *, dp, uint64_t, txg);
spa_txg_history_fini_io(spa, ts);
cv_broadcast(&tx->tx_sync_done_cv);
/*
* Dispatch commit callbacks to worker threads.
*/
txg_dispatch_callbacks(dp, txg);
spa_config_enter(spa, SCL_ALL, FTAG, RW_READER);
vdev_get_stats(spa->spa_root_vdev, vs2);
spa_config_exit(spa, SCL_ALL, FTAG);
spa_txg_history_set_io(spa, txg,
vs2->vs_bytes[ZIO_TYPE_READ]-vs1->vs_bytes[ZIO_TYPE_READ],
vs2->vs_bytes[ZIO_TYPE_WRITE]-vs1->vs_bytes[ZIO_TYPE_WRITE],
vs2->vs_ops[ZIO_TYPE_READ]-vs1->vs_ops[ZIO_TYPE_READ],
vs2->vs_ops[ZIO_TYPE_WRITE]-vs1->vs_ops[ZIO_TYPE_WRITE],
ndirty);
spa_txg_history_set(spa, txg, TXG_STATE_SYNCED, gethrtime());
}
}