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cpuplugd/cpu: Rework CPU management functions

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Simplify the cpu management parts of cpuplugd code by introducing
functions from libutil and rework some logic to drop some assumptions
about how kernel assigns cpuids.
Right now cpuplugd assumes that the cpuids are always sequential and
there are no gaps in between, however kernel does not guarantee that.
Make cpuplugd compliant by traversing cpu sysfs entries instead.

Reviewed-by: Steffen Eiden <seiden@linux.ibm.com>
Reviewed-by: Gerald Schaefer <gerald.schaefer@linux.ibm.com>
Signed-off-by: Mete Durlu <meted@linux.ibm.com>
Signed-off-by: Jan Höppner <hoeppner@linux.ibm.com>
This commit is contained in:
Mete Durlu
2024-05-23 10:51:15 +02:00
committed by Jan Höppner
parent 0e4992da3a
commit c91d172c99
5 changed files with 195 additions and 224 deletions
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cpuplugd/config.c
+6 -23
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@@ -211,7 +211,6 @@ void parse_configfile(char *file)
*/
void check_config()
{
int cpuid;
int lpar_status;
lpar_status = check_lpar();
@@ -275,33 +274,17 @@ void check_config()
get_numcpus() >= cfg.cpu_min) {
cpuplugd_debug("The number of online cpus is below "
"the minimum and will be increased.\n");
cpuid = 0;
while (get_num_online_cpus() < cfg.cpu_min &&
cpuid < get_numcpus()) {
if (is_online(cpuid) == 1) {
cpuid++;
continue;
}
cpuplugd_debug("cpu with id %d is currently offline "
"and will be enabled\n", cpuid);
hotplug(cpuid);
cpuid++;
while (get_num_online_cpus() < cfg.cpu_min) {
if (hotplug_one_cpu())
break;
}
}
if (get_num_online_cpus() > cfg.cpu_max) {
cpuplugd_debug("The number of online cpus is above the maximum"
" and will be decreased.\n");
cpuid = 0;
while (get_num_online_cpus() > cfg.cpu_max &&
cpuid < get_numcpus()) {
if (is_online(cpuid) != 1) {
cpuid++;
continue;
}
cpuplugd_debug("cpu with id %d is currently online "
"and will be disabled\n", cpuid);
hotunplug(cpuid);
cpuid++;
while (get_num_online_cpus() > cfg.cpu_max) {
if (hotunplug_one_cpu())
break;
}
}
if (cfg.cpu_min > get_numcpus())