From 570827e129ed81e066e894530bbe24642f473154 Mon Sep 17 00:00:00 2001 From: Brian Behlendorf Date: Fri, 20 Jan 2012 10:58:57 -0800 Subject: Add 'dmu_tx' kstats entry 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 --- module/zfs/arc.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) (limited to 'module/zfs/arc.c') diff --git a/module/zfs/arc.c b/module/zfs/arc.c index cfd4c7981..10317b642 100644 --- a/module/zfs/arc.c +++ b/module/zfs/arc.c @@ -138,6 +138,7 @@ #endif #include #include +#include #include 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); -- cgit v1.2.3