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cpuplugd: Allow cpu hotplugging on systems without polarization

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Cpuplugd checks for system polarization before adjusting cpu hotplug
states. Currently, if the sysfs attribute for polarization is not
present cpuplugd does not make any adjustments. Add a new polarization
type PLR_NONE to reflect systems with no polarization state and allow
cpuplugd to adjust cpu hotplugging.

Signed-off-by: Mete Durlu <meted@linux.ibm.com>
Reviewed-by: Gerald Schaefer <gerald.schaefer@linux.ibm.com>
Reviewed-by: Jan Höppner <hoeppner@linux.ibm.com>
Signed-off-by: Jan Höppner <hoeppner@linux.ibm.com>
This commit is contained in:
Mete Durlu
2025-03-19 18:38:44 +01:00
committed by Jan Höppner
parent 829fc3b294
commit 253ca8a30e
3 changed files with 4 additions and 2 deletions
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3
cpuplugd/config.c
View File

@@ -314,8 +314,7 @@ void check_config()
cpuplugd_debug("Daemon started with vertical polarization.\n");
cpuplugd_debug("Cpu adjustments won't be made until system ");
cpuplugd_debug("is in horizontal polarization\n");
} else if (saved_polarization == PLR_HORIZONTAL &&
cpu == 1) {
} else if (cpu == 1) {
apply_cpu_config();
}
if (memory == 1) {

2
cpuplugd/cpu.c
View File

@@ -87,6 +87,8 @@ int get_polarization(void)
char *path;
path = util_path_sysfs("devices/system/cpu/dispatching");
if (!util_path_exists(path))
return PLR_NONE;
if (util_file_read_i(&polarization, NUM_BASE, path) < 0) {
polarization = -1;
cpuplugd_debug("failed to read system polarization\n");

1
cpuplugd/cpuplugd.h
View File

@@ -40,6 +40,7 @@
#define CPUSTATS 10
#define PLR_HORIZONTAL 0
#define PLR_VERTICAL 1
#define PLR_NONE 2
/*
* Precedence of C operators