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module/*.ko: prune .data, global .rodata

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Evaluated every variable that lives in .data (and globals in .rodata)
in the kernel modules, and constified/eliminated/localised them
appropriately. This means that all read-only data is now actually
read-only data, and, if possible, at file scope. A lot of previously-
global-symbols became inlinable (and inlined!) constants. Probably
not in a big Wowee Performance Moment, but hey.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Ahelenia Ziemiańska <nabijaczleweli@nabijaczleweli.xyz>
Closes #12899
This commit is contained in:
наб
2022-01-15 00:37:55 +01:00
committed by GitHub
parent 7adc190098
commit 18168da727
147 changed files with 781 additions and 876 deletions
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module/zfs/arc.c
+34 -33
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@@ -352,7 +352,7 @@ static list_t arc_evict_waiters;
* can still happen, even during the potentially long time that arc_size is
* more than arc_c.
*/
int zfs_arc_eviction_pct = 200;
static int zfs_arc_eviction_pct = 200;
/*
* The number of headers to evict in arc_evict_state_impl() before
@@ -361,7 +361,7 @@ int zfs_arc_eviction_pct = 200;
* oldest header in the arc state), but comes with higher overhead
* (i.e. more invocations of arc_evict_state_impl()).
*/
int zfs_arc_evict_batch_limit = 10;
static int zfs_arc_evict_batch_limit = 10;
/* number of seconds before growing cache again */
int arc_grow_retry = 5;
@@ -369,13 +369,13 @@ int arc_grow_retry = 5;
/*
* Minimum time between calls to arc_kmem_reap_soon().
*/
int arc_kmem_cache_reap_retry_ms = 1000;
static const int arc_kmem_cache_reap_retry_ms = 1000;
/* shift of arc_c for calculating overflow limit in arc_get_data_impl */
int zfs_arc_overflow_shift = 8;
static int zfs_arc_overflow_shift = 8;
/* shift of arc_c for calculating both min and max arc_p */
int arc_p_min_shift = 4;
static int arc_p_min_shift = 4;
/* log2(fraction of arc to reclaim) */
int arc_shrink_shift = 7;
@@ -421,19 +421,22 @@ unsigned long zfs_arc_max = 0;
unsigned long zfs_arc_min = 0;
unsigned long zfs_arc_meta_limit = 0;
unsigned long zfs_arc_meta_min = 0;
unsigned long zfs_arc_dnode_limit = 0;
unsigned long zfs_arc_dnode_reduce_percent = 10;
int zfs_arc_grow_retry = 0;
int zfs_arc_shrink_shift = 0;
int zfs_arc_p_min_shift = 0;
static unsigned long zfs_arc_dnode_limit = 0;
static unsigned long zfs_arc_dnode_reduce_percent = 10;
static int zfs_arc_grow_retry = 0;
static int zfs_arc_shrink_shift = 0;
static int zfs_arc_p_min_shift = 0;
int zfs_arc_average_blocksize = 8 * 1024; /* 8KB */
/*
* ARC dirty data constraints for arc_tempreserve_space() throttle.
* ARC dirty data constraints for arc_tempreserve_space() throttle:
* * total dirty data limit
* * anon block dirty limit
* * each pool's anon allowance
*/
unsigned long zfs_arc_dirty_limit_percent = 50; /* total dirty data limit */
unsigned long zfs_arc_anon_limit_percent = 25; /* anon block dirty limit */
unsigned long zfs_arc_pool_dirty_percent = 20; /* each pool's anon allowance */
static const unsigned long zfs_arc_dirty_limit_percent = 50;
static const unsigned long zfs_arc_anon_limit_percent = 25;
static const unsigned long zfs_arc_pool_dirty_percent = 20;
/*
* Enable or disable compressed arc buffers.
@@ -444,24 +447,24 @@ int zfs_compressed_arc_enabled = B_TRUE;
* ARC will evict meta buffers that exceed arc_meta_limit. This
* tunable make arc_meta_limit adjustable for different workloads.
*/
unsigned long zfs_arc_meta_limit_percent = 75;
static unsigned long zfs_arc_meta_limit_percent = 75;
/*
* Percentage that can be consumed by dnodes of ARC meta buffers.
*/
unsigned long zfs_arc_dnode_limit_percent = 10;
static unsigned long zfs_arc_dnode_limit_percent = 10;
/*
* These tunables are Linux specific
* These tunables are Linux-specific
*/
unsigned long zfs_arc_sys_free = 0;
int zfs_arc_min_prefetch_ms = 0;
int zfs_arc_min_prescient_prefetch_ms = 0;
int zfs_arc_p_dampener_disable = 1;
int zfs_arc_meta_prune = 10000;
int zfs_arc_meta_strategy = ARC_STRATEGY_META_BALANCED;
int zfs_arc_meta_adjust_restarts = 4096;
int zfs_arc_lotsfree_percent = 10;
static unsigned long zfs_arc_sys_free = 0;
static int zfs_arc_min_prefetch_ms = 0;
static int zfs_arc_min_prescient_prefetch_ms = 0;
static int zfs_arc_p_dampener_disable = 1;
static int zfs_arc_meta_prune = 10000;
static int zfs_arc_meta_strategy = ARC_STRATEGY_META_BALANCED;
static int zfs_arc_meta_adjust_restarts = 4096;
static int zfs_arc_lotsfree_percent = 10;
/*
* Number of arc_prune threads
@@ -651,7 +654,7 @@ arc_sums_t arc_sums;
ARCSTAT(stat) = x; \
} while (0)
kstat_t *arc_ksp;
static kstat_t *arc_ksp;
/*
* There are several ARC variables that are critical to export as kstats --
@@ -785,7 +788,7 @@ unsigned long l2arc_feed_min_ms = L2ARC_FEED_MIN_MS; /* min interval msecs */
int l2arc_noprefetch = B_TRUE; /* don't cache prefetch bufs */
int l2arc_feed_again = B_TRUE; /* turbo warmup */
int l2arc_norw = B_FALSE; /* no reads during writes */
int l2arc_meta_percent = 33; /* limit on headers size */
static int l2arc_meta_percent = 33; /* limit on headers size */
/*
* L2ARC Internals
@@ -886,7 +889,7 @@ int l2arc_exclude_special = 0;
* l2arc_mfuonly : A ZFS module parameter that controls whether only MFU
* metadata and data are cached from ARC into L2ARC.
*/
int l2arc_mfuonly = 0;
static int l2arc_mfuonly = 0;
/*
* L2ARC TRIM
@@ -903,7 +906,7 @@ int l2arc_mfuonly = 0;
* will vary depending of how well the specific device handles
* these commands.
*/
unsigned long l2arc_trim_ahead = 0;
static unsigned long l2arc_trim_ahead = 0;
/*
* Performance tuning of L2ARC persistence:
@@ -918,8 +921,8 @@ unsigned long l2arc_trim_ahead = 0;
* data. In this case do not write log blocks in L2ARC in order
* not to waste space.
*/
int l2arc_rebuild_enabled = B_TRUE;
unsigned long l2arc_rebuild_blocks_min_l2size = 1024 * 1024 * 1024;
static int l2arc_rebuild_enabled = B_TRUE;
static unsigned long l2arc_rebuild_blocks_min_l2size = 1024 * 1024 * 1024;
/* L2ARC persistence rebuild control routines. */
void l2arc_rebuild_vdev(vdev_t *vd, boolean_t reopen);
@@ -4810,8 +4813,6 @@ arc_kmem_reap_soon(void)
size_t i;
kmem_cache_t *prev_cache = NULL;
kmem_cache_t *prev_data_cache = NULL;
extern kmem_cache_t *zio_buf_cache[];
extern kmem_cache_t *zio_data_buf_cache[];
#ifdef _KERNEL
if ((aggsum_compare(&arc_sums.arcstat_meta_used,