Author: mjg
Date: Sat Oct 31 19:07:32 2020
New Revision: 367229
URL: https://svnweb.freebsd.org/changeset/base/367229
Log:
zfs: zstd: track allocator statistics
This applies:
commit c4ede65bdfca11b532403620bbf0d6e33f0c1c1d
Author: Mateusz Guzik <mjgu...@gmail.com>
Date: Fri Oct 30 23:26:10 2020 +0100
zstd: track allocator statistics
Note that this only tracks sizes as requested by the caller.
Actual allocated space will almost always be bigger (e.g., rounded up to
the next power of 2 or page size). Additionally the allocated buffer may
be holding other areas hostage. Nonetheless, this is a starting point
for tracking memory usage in zstd.
from openzfs
Modified:
head/sys/contrib/openzfs/include/sys/zstd/zstd.h
head/sys/contrib/openzfs/module/zstd/zfs_zstd.c
Modified: head/sys/contrib/openzfs/include/sys/zstd/zstd.h
==============================================================================
--- head/sys/contrib/openzfs/include/sys/zstd/zstd.h Sat Oct 31 18:42:03
2020 (r367228)
+++ head/sys/contrib/openzfs/include/sys/zstd/zstd.h Sat Oct 31 19:07:32
2020 (r367229)
@@ -75,9 +75,11 @@ typedef struct zfs_zstd_header {
* kstat helper macros
*/
#define ZSTDSTAT(stat) (zstd_stats.stat.value.ui64)
-#define ZSTDSTAT_INCR(stat, val) \
+#define ZSTDSTAT_ADD(stat, val) \
atomic_add_64(&zstd_stats.stat.value.ui64, (val))
-#define ZSTDSTAT_BUMP(stat) ZSTDSTAT_INCR(stat, 1)
+#define ZSTDSTAT_SUB(stat, val) \
+ atomic_sub_64(&zstd_stats.stat.value.ui64, (val))
+#define ZSTDSTAT_BUMP(stat) ZSTDSTAT_ADD(stat, 1)
/* (de)init for user space / kernel emulation */
int zstd_init(void);
Modified: head/sys/contrib/openzfs/module/zstd/zfs_zstd.c
==============================================================================
--- head/sys/contrib/openzfs/module/zstd/zfs_zstd.c Sat Oct 31 18:42:03
2020 (r367228)
+++ head/sys/contrib/openzfs/module/zstd/zfs_zstd.c Sat Oct 31 19:07:32
2020 (r367229)
@@ -62,6 +62,8 @@ typedef struct zstd_stats {
kstat_named_t zstd_stat_dec_header_inval;
kstat_named_t zstd_stat_com_fail;
kstat_named_t zstd_stat_dec_fail;
+ kstat_named_t zstd_stat_buffers;
+ kstat_named_t zstd_stat_size;
} zstd_stats_t;
static zstd_stats_t zstd_stats = {
@@ -74,6 +76,8 @@ static zstd_stats_t zstd_stats = {
{ "decompress_header_invalid", KSTAT_DATA_UINT64 },
{ "compress_failed", KSTAT_DATA_UINT64 },
{ "decompress_failed", KSTAT_DATA_UINT64 },
+ { "buffers", KSTAT_DATA_UINT64 },
+ { "size", KSTAT_DATA_UINT64 },
};
/* Enums describing the allocator type specified by kmem_type in zstd_kmem */
@@ -248,6 +252,8 @@ zstd_mempool_alloc(struct zstd_pool *zstd_mempool, siz
/* Free memory if unused object older than 2 minutes */
if (pool->mem && gethrestime_sec() > pool->timeout) {
vmem_free(pool->mem, pool->size);
+ ZSTDSTAT_SUB(zstd_stat_buffers, 1);
+ ZSTDSTAT_SUB(zstd_stat_size, pool->size);
pool->mem = NULL;
pool->size = 0;
pool->timeout = 0;
@@ -275,12 +281,13 @@ zstd_mempool_alloc(struct zstd_pool *zstd_mempool, siz
/* Object is free, try to allocate new one */
if (!pool->mem) {
mem = vmem_alloc(size, KM_SLEEP);
- pool->mem = mem;
-
- if (pool->mem) {
+ if (mem) {
+ ZSTDSTAT_ADD(zstd_stat_buffers, 1);
+ ZSTDSTAT_ADD(zstd_stat_size, size);
+ pool->mem = mem;
+ pool->size = size;
/* Keep track for later release */
mem->pool = pool;
- pool->size = size;
mem->kmem_type = ZSTD_KMEM_POOL;
mem->kmem_size = size;
}
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