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ddt: dedup table quota enforcement

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This adds two new pool properties:
- dedup_table_size, the total size of all DDTs on the pool; and
- dedup_table_quota, the maximum possible size of all DDTs in the pool

When set, quota will be enforced by checking when a new entry is about
to be created. If the pool is over its dedup quota, the entry won't be
created, and the corresponding write will be converted to a regular
non-dedup write. Note that existing entries can be updated (ie their
refcounts changed), as that reuses the space rather than requiring more.

dedup_table_quota can be set to 'auto', which will set it based on the
size of the devices backing the "dedup" allocation device. This makes it
possible to limit the DDTs to the size of a dedup vdev only, such that
when the device fills, no new blocks are deduplicated.

Sponsored-by: iXsystems, Inc.
Sponsored-By: Klara Inc.
Reviewed-by: Alexander Motin <mav@FreeBSD.org>
Reviewed-by: Tony Hutter <hutter2@llnl.gov>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Rob Norris <rob.norris@klarasystems.com>
Signed-off-by: Don Brady <don.brady@klarasystems.com>
Co-authored-by: Don Brady <don.brady@klarasystems.com>
Co-authored-by: Rob Wing <rob.wing@klarasystems.com>
Co-authored-by: Sean Eric Fagan <sean.fagan@klarasystems.com>
Closes #15889
This commit is contained in:
Allan Jude
2024-07-25 12:47:36 -04:00
committed by GitHub
parent 82f281ad99
commit c7ada64bb6
22 changed files with 599 additions and 22 deletions
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include/sys/ddt.h
+4 -1
View File
@@ -151,7 +151,8 @@ enum ddt_phys_type {
*/
/* State flags for dde_flags */
#define DDE_FLAG_LOADED (1 << 0) /* entry ready for use */
#define DDE_FLAG_LOADED (1 << 0) /* entry ready for use */
#define DDE_FLAG_OVERQUOTA (1 << 1) /* entry unusable, no space */
typedef struct {
/* key must be first for ddt_key_compare */
@@ -170,6 +171,7 @@ typedef struct {
uint8_t dde_flags; /* load state flags */
kcondvar_t dde_cv; /* signaled when load completes */
uint64_t dde_waiters; /* count of waiters on dde_cv */
avl_node_t dde_node; /* ddt_tree node */
} ddt_entry_t;
@@ -228,6 +230,7 @@ extern void ddt_histogram_add(ddt_histogram_t *dst, const ddt_histogram_t *src);
extern void ddt_histogram_stat(ddt_stat_t *dds, const ddt_histogram_t *ddh);
extern boolean_t ddt_histogram_empty(const ddt_histogram_t *ddh);
extern void ddt_get_dedup_object_stats(spa_t *spa, ddt_object_t *ddo);
extern uint64_t ddt_get_ddt_dsize(spa_t *spa);
extern void ddt_get_dedup_histogram(spa_t *spa, ddt_histogram_t *ddh);
extern void ddt_get_dedup_stats(spa_t *spa, ddt_stat_t *dds_total);