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Illumos #3582, #3584

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3582 zfs_delay() should support a variable resolution
3584 DTrace sdt probes for ZFS txg states

Reviewed by: Matthew Ahrens <mahrens@delphix.com>
Reviewed by: George Wilson <george.wilson@delphix.com>
Reviewed by: Christopher Siden <christopher.siden@delphix.com>
Reviewed by: Dan McDonald <danmcd@nexenta.com>
Reviewed by: Richard Elling <richard.elling@dey-sys.com>
Approved by: Garrett D'Amore <garrett@damore.org>

References:
    https://www.illumos.org/issues/3582
    illumos/illumos-gate@0689f76

Ported by: Ned Bass <bass6@llnl.gov>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Issue #1775
This commit is contained in:
Adam Leventhal 2013-08-28 16:05:48 -07:00 committed by Brian Behlendorf
parent c1fabe7961
commit 63fd3c6cfd
10 changed files with 87 additions and 33 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
include/sys/txg.h
View File

@ -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.

6
include/sys/txg_impl.h
View File

@ -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 */

2
include/sys/zfs_context.h
View File

@ -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)

8
lib/libspl/include/sys/time.h
View File

@ -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 *);

35
lib/libzpool/kernel.c
View File

@ -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)
{

3
module/zfs/dsl_dir.c
View File

@ -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);

18
module/zfs/dsl_pool.c
View File

@ -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);
}

8
module/zfs/dsl_scan.c
View File

@ -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. */

4
module/zfs/spa_misc.c
View File

@ -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);

27
module/zfs/txg.c
View File

@ -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);