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Use wmsum for arc, abd, dbuf and zfetch statistics. (#12172)

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wmsum was designed exactly for cases like these with many updates
and rare reads.  It allows to completely avoid atomic operations on
congested global variables.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Mark Maybee <mark.maybee@delphix.com>
Signed-off-by: Alexander Motin <mav@FreeBSD.org>
Sponsored-By: iXsystems, Inc.
Closes #12172
This commit is contained in:
Alexander Motin
2021-06-16 20:19:34 -04:00
committed by Brian Behlendorf
parent 9a865b7fb7
commit 6b239d1757
8 changed files with 777 additions and 215 deletions
Download Patch File Download Diff File Expand all files Collapse all files
module/os/linux/zfs/abd_os.c
+75
View File
@@ -132,6 +132,20 @@ static abd_stats_t abd_stats = {
{ "scatter_sg_table_retry", KSTAT_DATA_UINT64 },
};
struct {
wmsum_t abdstat_struct_size;
wmsum_t abdstat_linear_cnt;
wmsum_t abdstat_linear_data_size;
wmsum_t abdstat_scatter_cnt;
wmsum_t abdstat_scatter_data_size;
wmsum_t abdstat_scatter_chunk_waste;
wmsum_t abdstat_scatter_orders[MAX_ORDER];
wmsum_t abdstat_scatter_page_multi_chunk;
wmsum_t abdstat_scatter_page_multi_zone;
wmsum_t abdstat_scatter_page_alloc_retry;
wmsum_t abdstat_scatter_sg_table_retry;
} abd_sums;
#define abd_for_each_sg(abd, sg, n, i) \
for_each_sg(ABD_SCATTER(abd).abd_sgl, sg, n, i)
@@ -687,6 +701,40 @@ abd_free_zero_scatter(void)
#endif /* _KERNEL */
}
static int
abd_kstats_update(kstat_t *ksp, int rw)
{
abd_stats_t *as = ksp->ks_data;
if (rw == KSTAT_WRITE)
return (EACCES);
as->abdstat_struct_size.value.ui64 =
wmsum_value(&abd_sums.abdstat_struct_size);
as->abdstat_linear_cnt.value.ui64 =
wmsum_value(&abd_sums.abdstat_linear_cnt);
as->abdstat_linear_data_size.value.ui64 =
wmsum_value(&abd_sums.abdstat_linear_data_size);
as->abdstat_scatter_cnt.value.ui64 =
wmsum_value(&abd_sums.abdstat_scatter_cnt);
as->abdstat_scatter_data_size.value.ui64 =
wmsum_value(&abd_sums.abdstat_scatter_data_size);
as->abdstat_scatter_chunk_waste.value.ui64 =
wmsum_value(&abd_sums.abdstat_scatter_chunk_waste);
for (int i = 0; i < MAX_ORDER; i++) {
as->abdstat_scatter_orders[i].value.ui64 =
wmsum_value(&abd_sums.abdstat_scatter_orders[i]);
}
as->abdstat_scatter_page_multi_chunk.value.ui64 =
wmsum_value(&abd_sums.abdstat_scatter_page_multi_chunk);
as->abdstat_scatter_page_multi_zone.value.ui64 =
wmsum_value(&abd_sums.abdstat_scatter_page_multi_zone);
as->abdstat_scatter_page_alloc_retry.value.ui64 =
wmsum_value(&abd_sums.abdstat_scatter_page_alloc_retry);
as->abdstat_scatter_sg_table_retry.value.ui64 =
wmsum_value(&abd_sums.abdstat_scatter_sg_table_retry);
return (0);
}
void
abd_init(void)
{
@@ -695,6 +743,19 @@ abd_init(void)
abd_cache = kmem_cache_create("abd_t", sizeof (abd_t),
0, NULL, NULL, NULL, NULL, NULL, 0);
wmsum_init(&abd_sums.abdstat_struct_size, 0);
wmsum_init(&abd_sums.abdstat_linear_cnt, 0);
wmsum_init(&abd_sums.abdstat_linear_data_size, 0);
wmsum_init(&abd_sums.abdstat_scatter_cnt, 0);
wmsum_init(&abd_sums.abdstat_scatter_data_size, 0);
wmsum_init(&abd_sums.abdstat_scatter_chunk_waste, 0);
for (i = 0; i < MAX_ORDER; i++)
wmsum_init(&abd_sums.abdstat_scatter_orders[i], 0);
wmsum_init(&abd_sums.abdstat_scatter_page_multi_chunk, 0);
wmsum_init(&abd_sums.abdstat_scatter_page_multi_zone, 0);
wmsum_init(&abd_sums.abdstat_scatter_page_alloc_retry, 0);
wmsum_init(&abd_sums.abdstat_scatter_sg_table_retry, 0);
abd_ksp = kstat_create("zfs", 0, "abdstats", "misc", KSTAT_TYPE_NAMED,
sizeof (abd_stats) / sizeof (kstat_named_t), KSTAT_FLAG_VIRTUAL);
if (abd_ksp != NULL) {
@@ -705,6 +766,7 @@ abd_init(void)
KSTAT_DATA_UINT64;
}
abd_ksp->ks_data = &abd_stats;
abd_ksp->ks_update = abd_kstats_update;
kstat_install(abd_ksp);
}
@@ -721,6 +783,19 @@ abd_fini(void)
abd_ksp = NULL;
}
wmsum_fini(&abd_sums.abdstat_struct_size);
wmsum_fini(&abd_sums.abdstat_linear_cnt);
wmsum_fini(&abd_sums.abdstat_linear_data_size);
wmsum_fini(&abd_sums.abdstat_scatter_cnt);
wmsum_fini(&abd_sums.abdstat_scatter_data_size);
wmsum_fini(&abd_sums.abdstat_scatter_chunk_waste);
for (int i = 0; i < MAX_ORDER; i++)
wmsum_fini(&abd_sums.abdstat_scatter_orders[i]);
wmsum_fini(&abd_sums.abdstat_scatter_page_multi_chunk);
wmsum_fini(&abd_sums.abdstat_scatter_page_multi_zone);
wmsum_fini(&abd_sums.abdstat_scatter_page_alloc_retry);
wmsum_fini(&abd_sums.abdstat_scatter_sg_table_retry);
if (abd_cache) {
kmem_cache_destroy(abd_cache);
abd_cache = NULL;
module/os/linux/zfs/arc_os.c
+1 -1
View File
@@ -135,7 +135,7 @@ arc_available_memory(void)
static uint64_t
arc_evictable_memory(void)
{
int64_t asize = aggsum_value(&arc_size);
int64_t asize = aggsum_value(&arc_sums.arcstat_size);
uint64_t arc_clean =
zfs_refcount_count(&arc_mru->arcs_esize[ARC_BUFC_DATA]) +
zfs_refcount_count(&arc_mru->arcs_esize[ARC_BUFC_METADATA]) +