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Add ActivatingConcurrencyMax for slice startup pacing

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Introduce Slice.ActivatingConcurrencyMax to limit how many units
within a slice hierarchy may be in activating state concurrently.

Expose the setting over D-Bus, support transient/property parsing,
enforce it during unit start dispatch, and re-check queued starts when
units leave activating state.

Document the new slice option and add a PID1 concurrency test covering
queued startup behavior.
This commit is contained in:
Morteza Pourkazemi
2026-08-03 14:29:07 +09:00
committed by Yu Watanabe
parent 6044c31038
commit 5f0d98e728
9 changed files with 183 additions and 13 deletions
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src/systemctl/systemctl-show.c
+13 -3
View File
@@ -273,6 +273,7 @@ typedef struct UnitStatusInfo {
/* Slice */
unsigned concurrency_hard_max;
unsigned concurrency_soft_max;
unsigned activating_concurrency_max;
unsigned n_currently_active;
/* CGroup */
@@ -758,16 +759,21 @@ static void print_status_info(
if (endswith(i->id, ".slice")) {
printf(" Act. Units: %u", i->n_currently_active);
if (i->concurrency_soft_max != UINT_MAX || i->concurrency_hard_max != UINT_MAX) {
if (i->concurrency_soft_max != UINT_MAX || i->concurrency_hard_max != UINT_MAX || i->activating_concurrency_max != UINT_MAX) {
fputs(" (", stdout);
if (i->concurrency_soft_max != UINT_MAX && i->concurrency_soft_max < i->concurrency_hard_max) {
printf("soft limit: %u", i->concurrency_soft_max);
if (i->concurrency_hard_max != UINT_MAX)
if (i->concurrency_hard_max != UINT_MAX || i->activating_concurrency_max != UINT_MAX)
fputs("; ", stdout);
}
if (i->concurrency_hard_max != UINT_MAX)
if (i->concurrency_hard_max != UINT_MAX) {
printf("hard limit: %u", i->concurrency_hard_max);
if (i->activating_concurrency_max != UINT_MAX)
fputs("; ", stdout);
}
if (i->activating_concurrency_max != UINT_MAX)
printf("activating limit: %u", i->activating_concurrency_max);
putchar(')');
}
@@ -2260,6 +2266,7 @@ static int show_one(
{ "What", "s", NULL, offsetof(UnitStatusInfo, what) },
{ "ConcurrencyHardMax", "u", NULL, offsetof(UnitStatusInfo, concurrency_hard_max) },
{ "ConcurrencySoftMax", "u", NULL, offsetof(UnitStatusInfo, concurrency_soft_max) },
{ "ActivatingConcurrencyMax", "u", NULL, offsetof(UnitStatusInfo, activating_concurrency_max) },
{ "NCurrentlyActive", "u", NULL, offsetof(UnitStatusInfo, n_currently_active) },
{ "MemoryCurrent", "t", NULL, offsetof(UnitStatusInfo, memory_current) },
{ "MemoryPeak", "t", NULL, offsetof(UnitStatusInfo, memory_peak) },
@@ -2336,6 +2343,9 @@ static int show_one(
.ip_egress_bytes = UINT64_MAX,
.io_read_bytes = UINT64_MAX,
.io_write_bytes = UINT64_MAX,
.concurrency_soft_max = UINT_MAX,
.concurrency_hard_max = UINT_MAX,
.activating_concurrency_max = UINT_MAX,
};
bool collect_found_properties;
int r;