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

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`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 GitHub
parent a60e15d6b9
commit 77a797a382
2 changed files with 18 additions and 7 deletions
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module/zfs/arc.c
+8 -3
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@@ -9158,12 +9158,17 @@ 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;