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sleep: freeze and thaw user.slice to save resource while suspend

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This commit is contained in:
Sonali Srivastava 2022-08-17 12:54:20 +05:30 committed by Yu Watanabe
parent 4ccde410a3
commit f13f91f06a
1 changed files with 31 additions and 0 deletions
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31
src/sleep/sleep.c
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@ -14,10 +14,13 @@
#include <sys/timerfd.h> #include <sys/timerfd.h>
#include <unistd.h> #include <unistd.h>
#include "sd-bus.h"
#include "sd-messages.h" #include "sd-messages.h"
#include "btrfs-util.h" #include "btrfs-util.h"
#include "bus-error.h" #include "bus-error.h"
#include "bus-locator.h"
#include "bus-util.h"
#include "def.h" #include "def.h"
#include "exec-util.h" #include "exec-util.h"
#include "fd-util.h" #include "fd-util.h"
@ -29,6 +32,7 @@
#include "parse-util.h" #include "parse-util.h"
#include "pretty-print.h" #include "pretty-print.h"
#include "sleep-config.h" #include "sleep-config.h"
#include "special.h"
#include "stdio-util.h" #include "stdio-util.h"
#include "string-util.h" #include "string-util.h"
#include "strv.h" #include "strv.h"
@ -349,11 +353,38 @@ static int custom_timer_suspend(const SleepConfig *sleep_config) {
return 1; return 1;
} }
/* Freeze when invoked and thaw on cleanup */
static int freeze_thaw_user_slice(const char **method) {
_cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
_cleanup_(sd_bus_flush_close_unrefp) sd_bus *bus = NULL;
int r;
if (!method || !*method)
return 0;
r = bus_connect_system_systemd(&bus);
if (r < 0)
return log_debug_errno(r, "Failed to open connection to systemd: %m");
r = bus_call_method(bus, bus_systemd_mgr, *method, &error, NULL, "s", SPECIAL_USER_SLICE);
if (r < 0)
return log_debug_errno(r, "Failed to execute operation: %s", bus_error_message(&error, r));
return 1;
}
static int execute_s2h(const SleepConfig *sleep_config) { static int execute_s2h(const SleepConfig *sleep_config) {
_unused_ _cleanup_(freeze_thaw_user_slice) const char *auto_method_thaw = NULL;
int r, k; int r, k;
assert(sleep_config); assert(sleep_config);
r = freeze_thaw_user_slice(&(const char*) { "FreezeUnit" });
if (r < 0)
log_debug_errno(r, "Failed to freeze unit user.slice, ignoring: %m");
else
auto_method_thaw = "ThawUnit"; /* from now on we want automatic thawing */;
r = check_wakeup_type(); r = check_wakeup_type();
if (r < 0) if (r < 0)
log_debug_errno(r, "Failed to check hardware wakeup type, ignoring: %m"); log_debug_errno(r, "Failed to check hardware wakeup type, ignoring: %m");