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Make zfs_special_class_metadata_reserve_pct into a parameter 

Exported and documented a new module parameter.

Reviewed-by: Richard Laager <rlaager@wiktel.com>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: DHE <git@dehacked.net>
Closes #8706
This commit is contained in:
DeHackEd 2019-05-07 18:34:42 -04:00 committed by Brian Behlendorf
parent caf9dd209f
commit 1f02ecc5a5
2 changed files with 19 additions and 0 deletions
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14
man/man5/zfs-module-parameters.5
View File

@ -2399,6 +2399,20 @@ vdev while discarding the checkpoint.
Default value: \fB16,777,216\fR.
.RE
.sp
.ne 2
.na
\fBzfs_special_class_metadata_reserve_pct\fR (int)
.ad
.RS 12n
Only allow small data blocks to be allocated on the special and dedup vdev
types when the available free space percentage on these vdevs exceeds this
value. This ensures reserved space is available for pool meta data as the
special vdevs approach capacity.
.sp
Default value: \fB25\fR.
.RE
.sp
.ne 2
.na

5
module/zfs/spa_misc.c
View File

@ -2689,5 +2689,10 @@ MODULE_PARM_DESC(zfs_ddt_data_is_special,
module_param(zfs_user_indirect_is_special, int, 0644);
MODULE_PARM_DESC(zfs_user_indirect_is_special,
"Place user data indirect blocks into the special class");
module_param(zfs_special_class_metadata_reserve_pct, int, 0644);
MODULE_PARM_DESC(zfs_special_class_metadata_reserve_pct,
"Small file blocks in special vdevs depends on this much "
"free space available");
/* END CSTYLED */
#endif