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Implement PCP support for minimum ZFS ARC size

This commit is contained in:
Benny Baumann 2022-05-29 21:17:25 +02:00 committed by BenBE
parent c0a9e92eea
commit 7694dbc821
3 changed files with 11 additions and 2 deletions
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1
pcp/PCPMetric.h
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@ -81,6 +81,7 @@ typedef enum PCPMetric_ {
PCP_ZFS_ARC_BONUS_SIZE, /* zfs.arc.bonus_size */
PCP_ZFS_ARC_COMPRESSED_SIZE, /* zfs.arc.compressed_size */
PCP_ZFS_ARC_UNCOMPRESSED_SIZE, /* zfs.arc.uncompressed_size */
PCP_ZFS_ARC_C_MIN, /* zfs.arc.c_min */
PCP_ZFS_ARC_C_MAX, /* zfs.arc.c_max */
PCP_ZFS_ARC_DBUF_SIZE, /* zfs.arc.dbuf_size */
PCP_ZFS_ARC_DNODE_SIZE, /* zfs.arc.dnode_size */

2
pcp/PCPProcessList.c
View File

@ -601,6 +601,8 @@ static inline void PCPProcessList_scanZfsArcstats(PCPProcessList* this) {
memset(&this->zfs, 0, sizeof(ZfsArcStats));
if (PCPMetric_values(PCP_ZFS_ARC_ANON_SIZE, &value, 1, PM_TYPE_U64))
this->zfs.anon = value.ull / ONE_K;
if (PCPMetric_values(PCP_ZFS_ARC_C_MIN, &value, 1, PM_TYPE_U64))
this->zfs.min = value.ull / ONE_K;
if (PCPMetric_values(PCP_ZFS_ARC_C_MAX, &value, 1, PM_TYPE_U64))
this->zfs.max = value.ull / ONE_K;
if (PCPMetric_values(PCP_ZFS_ARC_BONUS_SIZE, &value, 1, PM_TYPE_U64))

10
pcp/Platform.c
View File

@ -178,6 +178,7 @@ static const char* Platform_metricNames[] = {
[PCP_ZFS_ARC_BONUS_SIZE] = "zfs.arc.bonus_size",
[PCP_ZFS_ARC_COMPRESSED_SIZE] = "zfs.arc.compressed_size",
[PCP_ZFS_ARC_UNCOMPRESSED_SIZE] = "zfs.arc.uncompressed_size",
[PCP_ZFS_ARC_C_MIN] = "zfs.arc.c_min",
[PCP_ZFS_ARC_C_MAX] = "zfs.arc.c_max",
[PCP_ZFS_ARC_DBUF_SIZE] = "zfs.arc.dbuf_size",
[PCP_ZFS_ARC_DNODE_SIZE] = "zfs.arc.dnode_size",
@ -510,8 +511,13 @@ void Platform_setMemoryValues(Meter* this) {
this->values[4] = pl->availableMem;
if (ppl->zfs.enabled != 0) {
this->values[0] -= ppl->zfs.size;
this->values[3] += ppl->zfs.size;
// ZFS does not shrink below the value of zfs_arc_min.
unsigned long long int shrinkableSize = 0;
if (ppl->zfs.size > ppl->zfs.min)
shrinkableSize = ppl->zfs.size - ppl->zfs.min;
this->values[0] -= shrinkableSize;
this->values[3] += shrinkableSize;
this->values[4] += shrinkableSize;
}
}