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Persistent L2ARC

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This commit makes the L2ARC persistent across reboots. We implement
a light-weight persistent L2ARC metadata structure that allows L2ARC
contents to be recovered after a reboot. This significantly eases the
impact a reboot has on read performance on systems with large caches.

Reviewed-by: Matthew Ahrens <mahrens@delphix.com>
Reviewed-by: George Wilson <gwilson@delphix.com>
Reviewed-by: Ryan Moeller <ryan@iXsystems.com>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Co-authored-by: Saso Kiselkov <skiselkov@gmail.com>
Co-authored-by: Jorgen Lundman <lundman@lundman.net>
Co-authored-by: George Amanakis <gamanakis@gmail.com>
Ported-by: Yuxuan Shui <yshuiv7@gmail.com>
Signed-off-by: George Amanakis <gamanakis@gmail.com>
Closes #925 
Closes #1823 
Closes #2672 
Closes #3744 
Closes #9582
This commit is contained in:
George Amanakis
2020-04-10 13:33:35 -04:00
committed by GitHub
parent 36a6e2335c
commit 77f6826b83
30 changed files with 3020 additions and 88 deletions
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module/os/linux/zfs/zfs_sysfs.c
+2 -1
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@@ -353,13 +353,14 @@ pool_property_show(struct kobject *kobj, struct attribute *attr, char *buf)
* This list is intended for kernel features that don't have a pool feature
* association or that extend existing user kernel interfaces.
*
* A user processes can easily check if the running zfs kernel module
* A user process can easily check if the running zfs kernel module
* supports the new feature.
*/
static const char *zfs_kernel_features[] = {
/* --> Add new kernel features here */
"com.delphix:vdev_initialize",
"org.zfsonlinux:vdev_trim",
"org.openzfs:l2arc_persistent",
};
#define KERNEL_FEATURE_COUNT ARRAY_SIZE(zfs_kernel_features)