From 52f1ef3b2d64e3c628b84f18a53ac9091dec8d5c Mon Sep 17 00:00:00 2001 From: Mateusz Guzik Date: Fri, 30 Oct 2020 23:26:10 +0100 Subject: [PATCH] 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. Reviewed-by: Allan Jude Reviewed-by: Ryan Moeller Reviewed-by: Kjeld Schouten Signed-off-by: Mateusz Guzik Closes #11129 --- include/sys/zstd/zstd.h | 6 ++++-- module/zstd/zfs_zstd.c | 15 +++++++++++---- 2 files changed, 15 insertions(+), 6 deletions(-) diff --git a/include/sys/zstd/zstd.h b/include/sys/zstd/zstd.h index e42e44c23..8fe4a2482 100644 --- a/include/sys/zstd/zstd.h +++ b/include/sys/zstd/zstd.h @@ -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); diff --git a/module/zstd/zfs_zstd.c b/module/zstd/zfs_zstd.c index 34c56b7a7..5c896478f 100644 --- a/module/zstd/zfs_zstd.c +++ b/module/zstd/zfs_zstd.c @@ -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, size_t size) /* 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, size_t size) /* 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; }