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Trim L2ARC

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The l2arc_evict() function is responsible for evicting buffers which
reference the next bytes of the L2ARC device to be overwritten. Teach
this function to additionally TRIM that vdev space before it is
overwritten if the device has been filled with data. This is done by
vdev_trim_simple() which trims by issuing a new type of TRIM,
TRIM_TYPE_SIMPLE.

We also implement a "Trim Ahead" feature. It is a zfs module parameter,
expressed in % of the current write size. This trims ahead of the
current write size. A minimum of 64MB will be trimmed. The default is 0
which disables TRIM on L2ARC as it can put significant stress to
underlying storage devices. To enable TRIM on L2ARC we set
l2arc_trim_ahead > 0.

We also implement TRIM of the whole cache device upon addition to a
pool, pool creation or when the header of the device is invalid upon
importing a pool or onlining a cache device. This is dependent on
l2arc_trim_ahead > 0. TRIM of the whole device is done with
TRIM_TYPE_MANUAL so that its status can be monitored by zpool status -t.
We save the TRIM state for the whole device and the time of completion
on-disk in the header, and restore these upon L2ARC rebuild so that
zpool status -t can correctly report them. Whole device TRIM is done
asynchronously so that the user can export of the pool or remove the
cache device while it is trimming (ie if it is too slow).

We do not TRIM the whole device if persistent L2ARC has been disabled by
l2arc_rebuild_enabled = 0 because we may not want to lose all cached
buffers (eg we may want to import the pool with
l2arc_rebuild_enabled = 0 only once because of memory pressure). If
persistent L2ARC has been disabled by setting the module parameter
l2arc_rebuild_blocks_min_l2size to a value greater than the size of the
cache device then the whole device is trimmed upon creation or import of
a pool if l2arc_trim_ahead > 0.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Adam D. Moss <c@yotes.com>
Signed-off-by: George Amanakis <gamanakis@gmail.com>
Closes #9713
Closes #9789 
Closes #10224
This commit is contained in:
George Amanakis
2020-06-09 13:15:08 -04:00
committed by GitHub
parent 32f26eaa70
commit b7654bd794
18 changed files with 573 additions and 51 deletions
Download Patch File Download Diff File Expand all files Collapse all files
include/sys/spa.h
+8
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@@ -745,6 +745,7 @@ typedef enum {
typedef enum trim_type {
TRIM_TYPE_MANUAL = 0,
TRIM_TYPE_AUTO = 1,
TRIM_TYPE_SIMPLE = 2
} trim_type_t;
/* state manipulation functions */
@@ -788,6 +789,7 @@ extern int bpobj_enqueue_free_cb(void *arg, const blkptr_t *bp, dmu_tx_t *tx);
#define SPA_ASYNC_TRIM_RESTART 0x200
#define SPA_ASYNC_AUTOTRIM_RESTART 0x400
#define SPA_ASYNC_L2CACHE_REBUILD 0x800
#define SPA_ASYNC_L2CACHE_TRIM 0x1000
/*
* Controls the behavior of spa_vdev_remove().
@@ -940,6 +942,12 @@ typedef struct spa_iostats {
kstat_named_t autotrim_bytes_skipped;
kstat_named_t autotrim_extents_failed;
kstat_named_t autotrim_bytes_failed;
kstat_named_t simple_trim_extents_written;
kstat_named_t simple_trim_bytes_written;
kstat_named_t simple_trim_extents_skipped;
kstat_named_t simple_trim_bytes_skipped;
kstat_named_t simple_trim_extents_failed;
kstat_named_t simple_trim_bytes_failed;
} spa_iostats_t;
extern void spa_stats_init(spa_t *spa);