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Add 'dmu_tx' kstats entry

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Keep counters for the various reasons that a thread may end up
in txg_wait_open() waiting on a new txg.  This can be useful
when attempting to determine why a particular workload is
under performing.

Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
This commit is contained in:
Brian Behlendorf
2012-01-20 10:58:57 -08:00
parent 13be560d89
commit 570827e129
7 changed files with 93 additions and 4 deletions
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module/zfs/arc.c
+7 -1
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@@ -138,6 +138,7 @@
#endif
#include <sys/callb.h>
#include <sys/kstat.h>
#include <sys/dmu_tx.h>
#include <zfs_fletcher.h>
static kmutex_t arc_reclaim_thr_lock;
@@ -3584,6 +3585,7 @@ arc_memory_throttle(uint64_t reserve, uint64_t inflight_data, uint64_t txg)
} else if (page_load > 0 && arc_reclaim_needed()) {
/* memory is low, delay before restarting */
ARCSTAT_INCR(arcstat_memory_throttle_count, 1);
DMU_TX_STAT_BUMP(dmu_tx_memory_reclaim);
return (EAGAIN);
}
page_load = 0;
@@ -3599,6 +3601,7 @@ arc_memory_throttle(uint64_t reserve, uint64_t inflight_data, uint64_t txg)
if (inflight_data > available_memory / 4) {
ARCSTAT_INCR(arcstat_memory_throttle_count, 1);
DMU_TX_STAT_BUMP(dmu_tx_memory_inflight);
return (ERESTART);
}
#endif
@@ -3629,8 +3632,10 @@ arc_tempreserve_space(uint64_t reserve, uint64_t txg)
#endif
if (reserve > arc_c/4 && !arc_no_grow)
arc_c = MIN(arc_c_max, reserve * 4);
if (reserve > arc_c)
if (reserve > arc_c) {
DMU_TX_STAT_BUMP(dmu_tx_memory_reserve);
return (ENOMEM);
}
/*
* Don't count loaned bufs as in flight dirty data to prevent long
@@ -3663,6 +3668,7 @@ arc_tempreserve_space(uint64_t reserve, uint64_t txg)
arc_anon->arcs_lsize[ARC_BUFC_METADATA]>>10,
arc_anon->arcs_lsize[ARC_BUFC_DATA]>>10,
reserve>>10, arc_c>>10);
DMU_TX_STAT_BUMP(dmu_tx_dirty_throttle);
return (ERESTART);
}
atomic_add_64(&arc_tempreserve, reserve);