c/mirror_zfs
1
0
Fork 0
mirror of https://git.proxmox.com/git/mirror_zfs.git synced 2026-05-22 02:27:36 +03:00
Code Issues Packages Projects Releases Wiki Activity

Enable L2 cache of all (MRU+MFU) metadata but MFU data only

Browse Source 
`l2arc_mfuonly` was added to avoid wasting L2 ARC on read-once MRU
data and metadata. However it can be useful to cache as much
metadata as possible while, at the same time, restricting data
cache to MFU buffers only.

This patch allow for such behavior by setting `l2arc_mfuonly` to 2
(or higher). The list of possible values is the following:
0: cache both MRU and MFU for both data and metadata;
1: cache only MFU for both data and metadata;
2: cache both MRU and MFU for metadata, but only MFU for data.

Reviewed-by: Alexander Motin <mav@FreeBSD.org>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Gionatan Danti <g.danti@assyoma.it>
Closes #16343 
Closes #16402
This commit is contained in:
shodanshok
2024-08-16 22:34:07 +02:00
committed by Tony Hutter
parent c60df6a801
commit cd42e992b5
2 changed files with 18 additions and 7 deletions
Download Patch File Download Diff File Expand all files Collapse all files
module/zfs/arc.c
+8 -3
View File
@@ -9055,12 +9055,17 @@ l2arc_write_buffers(spa_t *spa, l2arc_dev_t *dev, uint64_t target_sz)
*/
for (int pass = 0; pass < L2ARC_FEED_TYPES; pass++) {
/*
* If pass == 1 or 3, we cache MRU metadata and data
* respectively.
* pass == 0: MFU meta
* pass == 1: MRU meta
* pass == 2: MFU data
* pass == 3: MRU data
*/
if (l2arc_mfuonly) {
if (l2arc_mfuonly == 1) {
if (pass == 1 || pass == 3)
continue;
} else if (l2arc_mfuonly > 1) {
if (pass == 3)
continue;
}
uint64_t passed_sz = 0;