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Make arc+l2arc module options writable
The l2arc module options can be made safely writable. This allows the options to be changed without unloading/loading the modules. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
This commit is contained in:
Brian Behlendorf
parent
c93504f03a
commit
bce45ec9fb
109
module/zfs/arc.c
109
module/zfs/arc.c
@ -148,7 +148,7 @@ static kcondvar_t arc_reclaim_thr_cv; /* used to signal reclaim thr */
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static uint8_t arc_thread_exit;
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/* number of bytes to prune from caches when at arc_meta_limit is reached */
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uint_t arc_meta_prune = 1048576;
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int zfs_arc_meta_prune = 1048576;
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typedef enum arc_reclaim_strategy {
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ARC_RECLAIM_AGGR, /* Aggressive reclaim strategy */
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@ -156,25 +156,31 @@ typedef enum arc_reclaim_strategy {
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} arc_reclaim_strategy_t;
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/* number of seconds before growing cache again */
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static int arc_grow_retry = 5;
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/* expiration time for arc_no_grow */
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static clock_t arc_grow_time = 0;
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int zfs_arc_grow_retry = 5;
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/* shift of arc_c for calculating both min and max arc_p */
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static int arc_p_min_shift = 4;
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int zfs_arc_p_min_shift = 4;
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/* log2(fraction of arc to reclaim) */
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static int arc_shrink_shift = 5;
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int zfs_arc_shrink_shift = 5;
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/*
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* minimum lifespan of a prefetch block in clock ticks
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* (initialized in arc_init())
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*/
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static int arc_min_prefetch_lifespan;
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int zfs_arc_min_prefetch_lifespan = HZ;
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/* disable arc proactive arc throttle due to low memory */
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int zfs_arc_memory_throttle_disable = 1;
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/* disable duplicate buffer eviction */
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int zfs_disable_dup_eviction = 0;
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static int arc_dead;
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/* expiration time for arc_no_grow */
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static clock_t arc_grow_time = 0;
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/*
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* The arc has filled available memory and has now warmed up.
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*/
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@ -186,12 +192,6 @@ static boolean_t arc_warm;
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unsigned long zfs_arc_max = 0;
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unsigned long zfs_arc_min = 0;
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unsigned long zfs_arc_meta_limit = 0;
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int zfs_arc_grow_retry = 0;
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int zfs_arc_shrink_shift = 0;
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int zfs_arc_p_min_shift = 0;
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int zfs_arc_memory_throttle_disable = 1;
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int zfs_disable_dup_eviction = 0;
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int zfs_arc_meta_prune = 0;
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/*
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* Note that buffers can be in one of 6 states:
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@ -1761,7 +1761,7 @@ arc_evict(arc_state_t *state, uint64_t spa, int64_t bytes, boolean_t recycle,
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(spa && ab->b_spa != spa) ||
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(ab->b_flags & (ARC_PREFETCH|ARC_INDIRECT) &&
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ddi_get_lbolt() - ab->b_arc_access <
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arc_min_prefetch_lifespan)) {
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zfs_arc_min_prefetch_lifespan)) {
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skipped++;
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continue;
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}
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@ -2112,7 +2112,7 @@ arc_adjust_meta(int64_t adjustment, boolean_t may_prune)
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}
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if (may_prune && (adjustment > 0) && (arc_meta_used > arc_meta_limit))
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arc_do_user_prune(arc_meta_prune);
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arc_do_user_prune(zfs_arc_meta_prune);
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}
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/*
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@ -2163,14 +2163,14 @@ arc_shrink(uint64_t bytes)
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if (arc_c > arc_c_min) {
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uint64_t to_free;
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to_free = bytes ? bytes : arc_c >> arc_shrink_shift;
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to_free = bytes ? bytes : arc_c >> zfs_arc_shrink_shift;
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if (arc_c > arc_c_min + to_free)
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atomic_add_64(&arc_c, -to_free);
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else
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arc_c = arc_c_min;
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atomic_add_64(&arc_p, -(arc_p >> arc_shrink_shift));
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atomic_add_64(&arc_p, -(arc_p >> zfs_arc_shrink_shift));
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if (arc_c > arc_size)
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arc_c = MAX(arc_size, arc_c_min);
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if (arc_p > arc_c)
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@ -2249,7 +2249,7 @@ arc_adapt_thread(void)
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}
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/* reset the growth delay for every reclaim */
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arc_grow_time = ddi_get_lbolt()+(arc_grow_retry * hz);
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arc_grow_time = ddi_get_lbolt()+(zfs_arc_grow_retry * hz);
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arc_kmem_reap_now(last_reclaim, 0);
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arc_warm = B_TRUE;
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@ -2279,6 +2279,26 @@ arc_adapt_thread(void)
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(void) cv_timedwait_interruptible(&arc_reclaim_thr_cv,
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&arc_reclaim_thr_lock, (ddi_get_lbolt() + hz));
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CALLB_CPR_SAFE_END(&cpr, &arc_reclaim_thr_lock);
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/* Allow the module options to be changed */
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if (zfs_arc_max > 64 << 20 &&
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zfs_arc_max < physmem * PAGESIZE &&
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zfs_arc_max != arc_c_max)
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arc_c_max = zfs_arc_max;
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if (zfs_arc_min > 0 &&
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zfs_arc_min < arc_c_max &&
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zfs_arc_min != arc_c_min)
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arc_c_min = zfs_arc_min;
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if (zfs_arc_meta_limit > 0 &&
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zfs_arc_meta_limit <= arc_c_max &&
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zfs_arc_meta_limit != arc_meta_limit)
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arc_meta_limit = zfs_arc_meta_limit;
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}
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arc_thread_exit = 0;
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@ -2399,7 +2419,7 @@ __arc_shrinker_func(struct shrinker *shrink, struct shrink_control *sc)
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ARCSTAT_BUMP(arcstat_memory_indirect_count);
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} else {
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arc_no_grow = B_TRUE;
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arc_grow_time = ddi_get_lbolt() + (arc_grow_retry * hz);
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arc_grow_time = ddi_get_lbolt() + (zfs_arc_grow_retry * hz);
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ARCSTAT_BUMP(arcstat_memory_direct_count);
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}
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@ -2421,7 +2441,7 @@ static void
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arc_adapt(int bytes, arc_state_t *state)
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{
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int mult;
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uint64_t arc_p_min = (arc_c >> arc_p_min_shift);
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uint64_t arc_p_min = (arc_c >> zfs_arc_p_min_shift);
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if (state == arc_l2c_only)
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return;
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@ -3756,7 +3776,7 @@ arc_init(void)
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cv_init(&arc_reclaim_thr_cv, NULL, CV_DEFAULT, NULL);
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/* Convert seconds to clock ticks */
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arc_min_prefetch_lifespan = 1 * hz;
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zfs_arc_min_prefetch_lifespan = 1 * hz;
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/* Start out with 1/8 of all memory */
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arc_c = physmem * PAGESIZE / 8;
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@ -3804,18 +3824,6 @@ arc_init(void)
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if (arc_c_min < arc_meta_limit / 2 && zfs_arc_min == 0)
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arc_c_min = arc_meta_limit / 2;
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if (zfs_arc_grow_retry > 0)
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arc_grow_retry = zfs_arc_grow_retry;
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if (zfs_arc_shrink_shift > 0)
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arc_shrink_shift = zfs_arc_shrink_shift;
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if (zfs_arc_p_min_shift > 0)
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arc_p_min_shift = zfs_arc_p_min_shift;
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if (zfs_arc_meta_prune > 0)
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arc_meta_prune = zfs_arc_meta_prune;
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/* if kmem_flags are set, lets try to use less memory */
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if (kmem_debugging())
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arc_c = arc_c / 2;
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@ -5013,25 +5021,25 @@ EXPORT_SYMBOL(arc_getbuf_func);
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EXPORT_SYMBOL(arc_add_prune_callback);
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EXPORT_SYMBOL(arc_remove_prune_callback);
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module_param(zfs_arc_min, ulong, 0444);
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module_param(zfs_arc_min, ulong, 0644);
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MODULE_PARM_DESC(zfs_arc_min, "Min arc size");
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module_param(zfs_arc_max, ulong, 0444);
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module_param(zfs_arc_max, ulong, 0644);
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MODULE_PARM_DESC(zfs_arc_max, "Max arc size");
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module_param(zfs_arc_meta_limit, ulong, 0444);
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module_param(zfs_arc_meta_limit, ulong, 0644);
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MODULE_PARM_DESC(zfs_arc_meta_limit, "Meta limit for arc size");
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module_param(zfs_arc_meta_prune, int, 0444);
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module_param(zfs_arc_meta_prune, int, 0644);
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MODULE_PARM_DESC(zfs_arc_meta_prune, "Bytes of meta data to prune");
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module_param(zfs_arc_grow_retry, int, 0444);
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module_param(zfs_arc_grow_retry, int, 0644);
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MODULE_PARM_DESC(zfs_arc_grow_retry, "Seconds before growing arc size");
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module_param(zfs_arc_shrink_shift, int, 0444);
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module_param(zfs_arc_shrink_shift, int, 0644);
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MODULE_PARM_DESC(zfs_arc_shrink_shift, "log2(fraction of arc to reclaim)");
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module_param(zfs_arc_p_min_shift, int, 0444);
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module_param(zfs_arc_p_min_shift, int, 0644);
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MODULE_PARM_DESC(zfs_arc_p_min_shift, "arc_c shift to calc min/max arc_p");
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module_param(zfs_disable_dup_eviction, int, 0644);
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@ -5040,28 +5048,31 @@ MODULE_PARM_DESC(zfs_disable_dup_eviction, "disable duplicate buffer eviction");
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module_param(zfs_arc_memory_throttle_disable, int, 0644);
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MODULE_PARM_DESC(zfs_arc_memory_throttle_disable, "disable memory throttle");
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module_param(l2arc_write_max, ulong, 0444);
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module_param(zfs_arc_min_prefetch_lifespan, int, 0644);
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MODULE_PARM_DESC(zfs_arc_min_prefetch_lifespan, "Min life of prefetch block");
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module_param(l2arc_write_max, ulong, 0644);
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MODULE_PARM_DESC(l2arc_write_max, "Max write bytes per interval");
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module_param(l2arc_write_boost, ulong, 0444);
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module_param(l2arc_write_boost, ulong, 0644);
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MODULE_PARM_DESC(l2arc_write_boost, "Extra write bytes during device warmup");
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module_param(l2arc_headroom, ulong, 0444);
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module_param(l2arc_headroom, ulong, 0644);
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MODULE_PARM_DESC(l2arc_headroom, "Number of max device writes to precache");
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module_param(l2arc_feed_secs, ulong, 0444);
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module_param(l2arc_feed_secs, ulong, 0644);
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MODULE_PARM_DESC(l2arc_feed_secs, "Seconds between L2ARC writing");
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module_param(l2arc_feed_min_ms, ulong, 0444);
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module_param(l2arc_feed_min_ms, ulong, 0644);
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MODULE_PARM_DESC(l2arc_feed_min_ms, "Min feed interval in milliseconds");
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module_param(l2arc_noprefetch, int, 0444);
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module_param(l2arc_noprefetch, int, 0644);
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MODULE_PARM_DESC(l2arc_noprefetch, "Skip caching prefetched buffers");
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module_param(l2arc_feed_again, int, 0444);
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module_param(l2arc_feed_again, int, 0644);
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MODULE_PARM_DESC(l2arc_feed_again, "Turbo L2ARC warmup");
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module_param(l2arc_norw, int, 0444);
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module_param(l2arc_norw, int, 0644);
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MODULE_PARM_DESC(l2arc_norw, "No reads during writes");
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#endif
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