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/* SPDX-License-Identifier: LGPL-2.1-or-later */
#include <getopt.h>
#include "build.h"
#include "bus-log-control-api.h"
#include "bus-object.h"
#include "cgroup-util.h"
#include "conf-parser.h"
#include "daemon-util.h"
#include "fileio.h"
#include "log.h"
#include "main-func.h"
#include "oomd-manager-bus.h"
#include "oomd-manager.h"
#include "parse-util.h"
#include "pretty-print.h"
#include "psi-util.h"
#include "signal-util.h"
static bool arg_dry_run = false;
static int arg_swap_used_limit_permyriad = -1;
static int arg_mem_pressure_limit_permyriad = -1;
static usec_t arg_mem_pressure_usec = 0;
static int parse_config(void) {
static const ConfigTableItem items[] = {
{ "OOM", "SwapUsedLimit", config_parse_permyriad, 0, &arg_swap_used_limit_permyriad },
{ "OOM", "DefaultMemoryPressureLimit", config_parse_permyriad, 0, &arg_mem_pressure_limit_permyriad },
{ "OOM", "DefaultMemoryPressureDurationSec", config_parse_sec, 0, &arg_mem_pressure_usec },
{}
};
return config_parse_standard_file_with_dropins(
"systemd/oomd.conf",
"OOM\0",
config_item_table_lookup, items,
CONFIG_PARSE_WARN,
/* userdata= */ NULL);
}
static int help(void) {
_cleanup_free_ char *link = NULL;
int r;
r = terminal_urlify_man("systemd-oomd", "8", &link);
if (r < 0)
return log_oom();
printf("%s [OPTIONS...]\n\n"
"Run the userspace out-of-memory (OOM) killer.\n\n"
" -h --help Show this help\n"
" --version Show package version\n"
" --dry-run Only print destructive actions instead of doing them\n"
" --bus-introspect=PATH Write D-Bus XML introspection data\n"
"\nSee the %s for details.\n",
program_invocation_short_name,
link);
return 0;
}
static int parse_argv(int argc, char *argv[]) {
enum {
ARG_VERSION = 0x100,
ARG_DRY_RUN,
ARG_BUS_INTROSPECT,
};
static const struct option options[] = {
{ "help", no_argument, NULL, 'h' },
{ "version", no_argument, NULL, ARG_VERSION },
{ "dry-run", no_argument, NULL, ARG_DRY_RUN },
{ "bus-introspect", required_argument, NULL, ARG_BUS_INTROSPECT },
{}
};
int c;
assert(argc >= 0);
assert(argv);
while ((c = getopt_long(argc, argv, "h", options, NULL)) >= 0)
switch (c) {
case 'h':
return help();
case ARG_VERSION:
return version();
case ARG_DRY_RUN:
arg_dry_run = true;
break;
case ARG_BUS_INTROSPECT:
return bus_introspect_implementations(
stdout,
optarg,
BUS_IMPLEMENTATIONS(&manager_object,
&log_control_object));
case '?':
return -EINVAL;
default:
assert_not_reached();
}
if (optind < argc)
return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
"This program takes no arguments.");
return 1;
}
static int run(int argc, char *argv[]) {
_unused_ _cleanup_(notify_on_cleanup) const char *notify_msg = NULL;
_cleanup_(manager_freep) Manager *m = NULL;
_cleanup_free_ char *swap = NULL;
unsigned long long s = 0;
CGroupMask mask;
int r;
log_setup();
r = parse_argv(argc, argv);
if (r <= 0)
return r;
r = parse_config();
if (r < 0)
return r;
/* Do some basic requirement checks for running systemd-oomd. It's not exhaustive as some of the other
* requirements do not have a reliable means to check for in code. */
int n = sd_listen_fds(0);
if (n > 1)
return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Received too many file descriptors");
int fd = n == 1 ? SD_LISTEN_FDS_START : -1;
/* SwapTotal is always available in /proc/meminfo and defaults to 0, even on swap-disabled kernels. */
r = get_proc_field("/proc/meminfo", "SwapTotal", WHITESPACE, &swap);
if (r < 0)
return log_error_errno(r, "Failed to get SwapTotal from /proc/meminfo: %m");
r = safe_atollu(swap, &s);
if (r < 0 || s == 0)
log_warning("No swap; memory pressure usage will be degraded");
if (!is_pressure_supported())
return log_error_errno(SYNTHETIC_ERRNO(EOPNOTSUPP), "Pressure Stall Information (PSI) is not supported");
r = cg_all_unified();
if (r < 0)
return log_error_errno(r, "Failed to determine whether the unified cgroups hierarchy is used: %m");
if (r == 0)
return log_error_errno(SYNTHETIC_ERRNO(EOPNOTSUPP), "Requires the unified cgroups hierarchy");
r = cg_mask_supported(&mask);
if (r < 0)
return log_error_errno(r, "Failed to get supported cgroup controllers: %m");
if (!FLAGS_SET(mask, CGROUP_MASK_MEMORY))
return log_error_errno(SYNTHETIC_ERRNO(EOPNOTSUPP), "Requires the cgroup memory controller.");
assert_se(sigprocmask_many(SIG_BLOCK, NULL, SIGTERM, SIGINT) >= 0);
if (arg_mem_pressure_usec > 0 && arg_mem_pressure_usec < 1 * USEC_PER_SEC)
return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "DefaultMemoryPressureDurationSec= must be 0 or at least 1s");
r = manager_new(&m);
if (r < 0)
return log_error_errno(r, "Failed to create manager: %m");
r = manager_start(
m,
arg_dry_run,
arg_swap_used_limit_permyriad,
arg_mem_pressure_limit_permyriad,
arg_mem_pressure_usec,
fd);
if (r < 0)
return log_error_errno(r, "Failed to start up daemon: %m");
notify_msg = notify_start(NOTIFY_READY, NOTIFY_STOPPING);
log_debug("systemd-oomd started%s.", arg_dry_run ? " in dry run mode" : "");
r = sd_event_loop(m->event);
if (r < 0)
return log_error_errno(r, "Event loop failed: %m");
return 0;
}
DEFINE_MAIN_FUNCTION(run);
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