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-rw-r--r--include/sys/txg.h9
-rw-r--r--include/sys/txg_impl.h6
-rw-r--r--include/sys/zfs_context.h2
-rw-r--r--lib/libspl/include/sys/time.h8
-rw-r--r--lib/libzpool/kernel.c35
-rw-r--r--module/zfs/dsl_dir.c3
-rw-r--r--module/zfs/dsl_pool.c18
-rw-r--r--module/zfs/dsl_scan.c8
-rw-r--r--module/zfs/spa_misc.c4
-rw-r--r--module/zfs/txg.c27
10 files changed, 87 insertions, 33 deletions
diff --git a/include/sys/txg.h b/include/sys/txg.h
index b9bbba8be..9e547819b 100644
--- a/include/sys/txg.h
+++ b/include/sys/txg.h
@@ -74,13 +74,8 @@ extern void txg_rele_to_quiesce(txg_handle_t *txghp);
extern void txg_rele_to_sync(txg_handle_t *txghp);
extern void txg_register_callbacks(txg_handle_t *txghp, list_t *tx_callbacks);
-/*
- * Delay the caller by the specified number of ticks or until
- * the txg closes (whichever comes first). This is intended
- * to be used to throttle writers when the system nears its
- * capacity.
- */
-extern void txg_delay(struct dsl_pool *dp, uint64_t txg, int ticks);
+extern void txg_delay(struct dsl_pool *dp, uint64_t txg, hrtime_t delta,
+ hrtime_t resolution);
/*
* Wait until the given transaction group has finished syncing.
diff --git a/include/sys/txg_impl.h b/include/sys/txg_impl.h
index 5a6d0e19f..8a0977f1f 100644
--- a/include/sys/txg_impl.h
+++ b/include/sys/txg_impl.h
@@ -70,7 +70,7 @@ struct tx_cpu {
kmutex_t tc_open_lock; /* protects tx_open_txg */
kmutex_t tc_lock; /* protects the rest of this struct */
kcondvar_t tc_cv[TXG_SIZE];
- uint64_t tc_count[TXG_SIZE];
+ uint64_t tc_count[TXG_SIZE]; /* tx hold count on each txg */
list_t tc_callbacks[TXG_SIZE]; /* commit cb list */
char tc_pad[8]; /* pad to fill 3 cache lines */
};
@@ -87,8 +87,8 @@ struct tx_cpu {
* every cpu (see txg_quiesce()).
*/
typedef struct tx_state {
- tx_cpu_t *tx_cpu; /* protects right to enter txg */
- kmutex_t tx_sync_lock; /* protects tx_state_t */
+ tx_cpu_t *tx_cpu; /* protects access to tx_open_txg */
+ kmutex_t tx_sync_lock; /* protects the rest of this struct */
uint64_t tx_open_txg; /* currently open txg id */
uint64_t tx_quiesced_txg; /* quiesced txg waiting for sync */
uint64_t tx_syncing_txg; /* currently syncing txg id */
diff --git a/include/sys/zfs_context.h b/include/sys/zfs_context.h
index dac74386d..adb152f58 100644
--- a/include/sys/zfs_context.h
+++ b/include/sys/zfs_context.h
@@ -338,6 +338,8 @@ extern void cv_init(kcondvar_t *cv, char *name, int type, void *arg);
extern void cv_destroy(kcondvar_t *cv);
extern void cv_wait(kcondvar_t *cv, kmutex_t *mp);
extern clock_t cv_timedwait(kcondvar_t *cv, kmutex_t *mp, clock_t abstime);
+extern clock_t cv_timedwait_hires(kcondvar_t *cvp, kmutex_t *mp, hrtime_t tim,
+ hrtime_t res, int flag);
extern void cv_signal(kcondvar_t *cv);
extern void cv_broadcast(kcondvar_t *cv);
#define cv_timedwait_interruptible(cv, mp, at) cv_timedwait(cv, mp, at)
diff --git a/lib/libspl/include/sys/time.h b/lib/libspl/include/sys/time.h
index 0cbbd928d..852b2eff9 100644
--- a/lib/libspl/include/sys/time.h
+++ b/lib/libspl/include/sys/time.h
@@ -50,6 +50,14 @@
#define NSEC_PER_USEC 1000L
#endif
+#ifndef MSEC2NSEC
+#define MSEC2NSEC(m) ((hrtime_t)(m) * (NANOSEC / MILLISEC))
+#endif
+
+#ifndef NSEC2MSEC
+#define NSEC2MSEC(n) ((n) / (NANOSEC / MILLISEC))
+#endif
+
extern hrtime_t gethrtime(void);
extern void gethrestime(timestruc_t *);
diff --git a/lib/libzpool/kernel.c b/lib/libzpool/kernel.c
index 2e5eef69b..f994f8ee3 100644
--- a/lib/libzpool/kernel.c
+++ b/lib/libzpool/kernel.c
@@ -528,6 +528,41 @@ top:
return (1);
}
+/*ARGSUSED*/
+clock_t
+cv_timedwait_hires(kcondvar_t *cv, kmutex_t *mp, hrtime_t tim, hrtime_t res,
+ int flag)
+{
+ int error;
+ timestruc_t ts;
+ hrtime_t delta;
+
+ ASSERT(flag == 0);
+
+top:
+ delta = tim - gethrtime();
+ if (delta <= 0)
+ return (-1);
+
+ ts.tv_sec = delta / NANOSEC;
+ ts.tv_nsec = delta % NANOSEC;
+
+ ASSERT(mutex_owner(mp) == curthread);
+ mp->m_owner = NULL;
+ error = pthread_cond_timedwait(&cv->cv, &mp->m_lock, &ts);
+ mp->m_owner = curthread;
+
+ if (error == ETIME)
+ return (-1);
+
+ if (error == EINTR)
+ goto top;
+
+ ASSERT(error == 0);
+
+ return (1);
+}
+
void
cv_signal(kcondvar_t *cv)
{
diff --git a/module/zfs/dsl_dir.c b/module/zfs/dsl_dir.c
index 572086b93..51a78f902 100644
--- a/module/zfs/dsl_dir.c
+++ b/module/zfs/dsl_dir.c
@@ -743,7 +743,8 @@ dsl_dir_tempreserve_space(dsl_dir_t *dd, uint64_t lsize, uint64_t asize,
err = dsl_pool_tempreserve_space(dd->dd_pool, asize, tx);
} else {
if (err == EAGAIN) {
- txg_delay(dd->dd_pool, tx->tx_txg, 1);
+ txg_delay(dd->dd_pool, tx->tx_txg,
+ MSEC2NSEC(10), MSEC2NSEC(10));
err = SET_ERROR(ERESTART);
}
dsl_pool_memory_pressure(dd->dd_pool);
diff --git a/module/zfs/dsl_pool.c b/module/zfs/dsl_pool.c
index c28ed3e03..950738e98 100644
--- a/module/zfs/dsl_pool.c
+++ b/module/zfs/dsl_pool.c
@@ -58,6 +58,9 @@ kmutex_t zfs_write_limit_lock;
static pgcnt_t old_physmem = 0;
+hrtime_t zfs_throttle_delay = MSEC2NSEC(10);
+hrtime_t zfs_throttle_resolution = MSEC2NSEC(10);
+
int
dsl_pool_open_special_dir(dsl_pool_t *dp, const char *name, dsl_dir_t **ddp)
{
@@ -512,12 +515,13 @@ dsl_pool_sync(dsl_pool_t *dp, uint64_t txg)
* Weight the throughput calculation towards the current value:
* thru = 3/4 old_thru + 1/4 new_thru
*
- * Note: write_time is in nanosecs, so write_time/MICROSEC
- * yields millisecs
+ * Note: write_time is in nanosecs while dp_throughput is expressed in
+ * bytes per millisecond.
*/
ASSERT(zfs_write_limit_min > 0);
- if (data_written > zfs_write_limit_min / 8 && write_time > MICROSEC) {
- uint64_t throughput = data_written / (write_time / MICROSEC);
+ if (data_written > zfs_write_limit_min / 8 &&
+ write_time > MSEC2NSEC(1)) {
+ uint64_t throughput = data_written / NSEC2MSEC(write_time);
if (dp->dp_throughput)
dp->dp_throughput = throughput / 4 +
@@ -617,8 +621,10 @@ dsl_pool_tempreserve_space(dsl_pool_t *dp, uint64_t space, dmu_tx_t *tx)
* the caller 1 clock tick. This will slow down the "fill"
* rate until the sync process can catch up with us.
*/
- if (reserved && reserved > (write_limit - (write_limit >> 3)))
- txg_delay(dp, tx->tx_txg, 1);
+ if (reserved && reserved > (write_limit - (write_limit >> 3))) {
+ txg_delay(dp, tx->tx_txg, zfs_throttle_delay,
+ zfs_throttle_resolution);
+ }
return (0);
}
diff --git a/module/zfs/dsl_scan.c b/module/zfs/dsl_scan.c
index de82ab1ce..6cc08ab47 100644
--- a/module/zfs/dsl_scan.c
+++ b/module/zfs/dsl_scan.c
@@ -409,7 +409,7 @@ dsl_scan_check_pause(dsl_scan_t *scn, const zbookmark_t *zb)
zfs_resilver_min_time_ms : zfs_scan_min_time_ms;
elapsed_nanosecs = gethrtime() - scn->scn_sync_start_time;
if (elapsed_nanosecs / NANOSEC > zfs_txg_timeout ||
- (elapsed_nanosecs / MICROSEC > mintime &&
+ (NSEC2MSEC(elapsed_nanosecs) > mintime &&
txg_sync_waiting(scn->scn_dp)) ||
spa_shutting_down(scn->scn_dp->dp_spa)) {
if (zb) {
@@ -1335,7 +1335,7 @@ dsl_scan_free_should_pause(dsl_scan_t *scn)
elapsed_nanosecs = gethrtime() - scn->scn_sync_start_time;
return (elapsed_nanosecs / NANOSEC > zfs_txg_timeout ||
- (elapsed_nanosecs / MICROSEC > zfs_free_min_time_ms &&
+ (NSEC2MSEC(elapsed_nanosecs) > zfs_free_min_time_ms &&
txg_sync_waiting(scn->scn_dp)) ||
spa_shutting_down(scn->scn_dp->dp_spa));
}
@@ -1459,7 +1459,7 @@ dsl_scan_sync(dsl_pool_t *dp, dmu_tx_t *tx)
"free_bpobj/bptree txg %llu",
(longlong_t)scn->scn_visited_this_txg,
(longlong_t)
- (gethrtime() - scn->scn_sync_start_time) / MICROSEC,
+ NSEC2MSEC(gethrtime() - scn->scn_sync_start_time),
(longlong_t)tx->tx_txg);
scn->scn_visited_this_txg = 0;
/*
@@ -1507,7 +1507,7 @@ dsl_scan_sync(dsl_pool_t *dp, dmu_tx_t *tx)
zfs_dbgmsg("visited %llu blocks in %llums",
(longlong_t)scn->scn_visited_this_txg,
- (longlong_t)(gethrtime() - scn->scn_sync_start_time) / MICROSEC);
+ (longlong_t)NSEC2MSEC(gethrtime() - scn->scn_sync_start_time));
if (!scn->scn_pausing) {
/* finished with scan. */
diff --git a/module/zfs/spa_misc.c b/module/zfs/spa_misc.c
index 5b2784125..ffba5028f 100644
--- a/module/zfs/spa_misc.c
+++ b/module/zfs/spa_misc.c
@@ -490,8 +490,8 @@ spa_add(const char *name, nvlist_t *config, const char *altroot)
spa->spa_proc = &p0;
spa->spa_proc_state = SPA_PROC_NONE;
- spa->spa_deadman_synctime = zfs_deadman_synctime *
- zfs_txg_synctime_ms * MICROSEC;
+ spa->spa_deadman_synctime = MSEC2NSEC(zfs_deadman_synctime *
+ zfs_txg_synctime_ms);
refcount_create(&spa->spa_refcount);
spa_config_lock_init(spa);
diff --git a/module/zfs/txg.c b/module/zfs/txg.c
index c0c0b295a..c8a29e14f 100644
--- a/module/zfs/txg.c
+++ b/module/zfs/txg.c
@@ -236,7 +236,7 @@ txg_thread_exit(tx_state_t *tx, callb_cpr_t *cpr, kthread_t **tpp)
}
static void
-txg_thread_wait(tx_state_t *tx, callb_cpr_t *cpr, kcondvar_t *cv, uint64_t time)
+txg_thread_wait(tx_state_t *tx, callb_cpr_t *cpr, kcondvar_t *cv, clock_t time)
{
CALLB_CPR_SAFE_BEGIN(cpr);
@@ -373,6 +373,9 @@ txg_quiesce(dsl_pool_t *dp, uint64_t txg)
spa_txg_history_set(dp->dp_spa, txg, TXG_STATE_OPEN, gethrtime());
spa_txg_history_add(dp->dp_spa, tx->tx_open_txg);
+ DTRACE_PROBE2(txg__quiescing, dsl_pool_t *, dp, uint64_t, txg);
+ DTRACE_PROBE2(txg__opened, dsl_pool_t *, dp, uint64_t, tx->tx_open_txg);
+
/*
* Now that we've incremented tx_open_txg, we can let threads
* enter the next transaction group.
@@ -531,6 +534,7 @@ txg_sync_thread(dsl_pool_t *dp)
txg = tx->tx_quiesced_txg;
tx->tx_quiesced_txg = 0;
tx->tx_syncing_txg = txg;
+ DTRACE_PROBE2(txg__syncing, dsl_pool_t *, dp, uint64_t, txg);
cv_broadcast(&tx->tx_quiesce_more_cv);
dprintf("txg=%llu quiesce_txg=%llu sync_txg=%llu\n",
@@ -544,6 +548,7 @@ txg_sync_thread(dsl_pool_t *dp)
mutex_enter(&tx->tx_sync_lock);
tx->tx_synced_txg = txg;
tx->tx_syncing_txg = 0;
+ DTRACE_PROBE2(txg__synced, dsl_pool_t *, dp, uint64_t, txg);
cv_broadcast(&tx->tx_sync_done_cv);
/*
@@ -602,21 +607,22 @@ txg_quiesce_thread(dsl_pool_t *dp)
*/
dprintf("quiesce done, handing off txg %llu\n", txg);
tx->tx_quiesced_txg = txg;
+ DTRACE_PROBE2(txg__quiesced, dsl_pool_t *, dp, uint64_t, txg);
cv_broadcast(&tx->tx_sync_more_cv);
cv_broadcast(&tx->tx_quiesce_done_cv);
}
}
/*
- * Delay this thread by 'ticks' if we are still in the open transaction
- * group and there is already a waiting txg quiesing or quiesced. Abort
- * the delay if this txg stalls or enters the quiesing state.
+ * Delay this thread by delay nanoseconds if we are still in the open
+ * transaction group and there is already a waiting txg quiesing or quiesced.
+ * Abort the delay if this txg stalls or enters the quiesing state.
*/
void
-txg_delay(dsl_pool_t *dp, uint64_t txg, int ticks)
+txg_delay(dsl_pool_t *dp, uint64_t txg, hrtime_t delay, hrtime_t resolution)
{
tx_state_t *tx = &dp->dp_tx;
- clock_t timeout = ddi_get_lbolt() + ticks;
+ hrtime_t start = gethrtime();
/* don't delay if this txg could transition to quiesing immediately */
if (tx->tx_open_txg > txg ||
@@ -629,10 +635,11 @@ txg_delay(dsl_pool_t *dp, uint64_t txg, int ticks)
return;
}
- while (ddi_get_lbolt() < timeout &&
- tx->tx_syncing_txg < txg-1 && !txg_stalled(dp))
- (void) cv_timedwait(&tx->tx_quiesce_more_cv, &tx->tx_sync_lock,
- timeout);
+ while (gethrtime() - start < delay &&
+ tx->tx_syncing_txg < txg-1 && !txg_stalled(dp)) {
+ (void) cv_timedwait_hires(&tx->tx_quiesce_more_cv,
+ &tx->tx_sync_lock, delay, resolution, 0);
+ }
DMU_TX_STAT_BUMP(dmu_tx_delay);
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-27 13:53:09 +0000