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oomd: notify via dbus what have been killed

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This commit is contained in:
Oleg Solovyov 2022-08-02 10:10:54 +03:00 committed by Lennart Poettering
parent 7238fd51d4
commit d784a8d474
3 changed files with 57 additions and 3 deletions
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31
man/org.freedesktop.oom1.xml
View file

@ -39,6 +39,9 @@ node /org/freedesktop/oom1 {
interface org.freedesktop.oom1.Manager {
methods:
DumpByFileDescriptor(out h fd);
signals:
Killed(s cgroup,
s reason);
};
interface org.freedesktop.DBus.Peer { ... };
interface org.freedesktop.DBus.Introspectable { ... };
@ -56,12 +59,38 @@ node /org/freedesktop/oom1 {
<variablelist class="dbus-method" generated="True" extra-ref="DumpByFileDescriptor()"/>
<variablelist class="dbus-signal" generated="True" extra-ref="Killed"/>
<!--End of Autogenerated section-->
<refsect2>
<title>Methods</title>
<para>...</para>
<para><function>Killed</function> signal is sent when any cgroup is killed by oomd.</para>
<para>Note that more reasons will be added in the future, and the table below will be expanded accordingly.</para>
<table>
<title>Killing reasons</title>
<tgroup cols="2" align="left" colsep="1" rowsep="1">
<colspec colname="reason"/>
<colspec colname="description"/>
<thead>
<row>
<entry>Reason</entry>
<entry>Description</entry>
</row>
</thead>
<tbody>
<row>
<entry>memory-used</entry>
<entry>Application took too much memory and swap.</entry>
</row>
<row>
<entry>memory-pressure</entry>
<entry>Application took enough memory and swap to cause sufficient slowdown of other applications.</entry>
</row>
</tbody>
</tgroup>
</table>
</refsect2>
</refsect1>

5
src/oom/oomd-manager-bus.c
View file

@ -38,6 +38,11 @@ static const sd_bus_vtable manager_vtable[] = {
SD_BUS_PARAM(fd),
bus_method_dump_by_fd,
SD_BUS_VTABLE_UNPRIVILEGED),
SD_BUS_SIGNAL_WITH_NAMES("Killed",
"ss",
SD_BUS_PARAM(cgroup)
SD_BUS_PARAM(reason),
0),
SD_BUS_VTABLE_END
};

24
src/oom/oomd-manager.c
View file

@ -410,7 +410,7 @@ static int monitor_swap_contexts_handler(sd_event_source *s, uint64_t usec, void
if (r < 0)
log_notice_errno(r, "Failed to kill any cgroup(s) based on swap: %m");
else {
if (selected && r > 0)
if (selected && r > 0) {
log_notice("Killed %s due to memory used (%"PRIu64") / total (%"PRIu64") and "
"swap used (%"PRIu64") / total (%"PRIu64") being more than "
PERMYRIAD_AS_PERCENT_FORMAT_STR,
@ -418,6 +418,16 @@ static int monitor_swap_contexts_handler(sd_event_source *s, uint64_t usec, void
m->system_context.mem_used, m->system_context.mem_total,
m->system_context.swap_used, m->system_context.swap_total,
PERMYRIAD_AS_PERCENT_FORMAT_VAL(m->swap_used_limit_permyriad));
/* send dbus signal */
(void) sd_bus_emit_signal(m->bus,
"/org/freedesktop/oom1",
"org.freedesktop.oom1.Manager",
"Killed",
"ss",
selected,
"memory-used");
}
return 0;
}
}
@ -524,13 +534,23 @@ static int monitor_memory_pressure_contexts_handler(sd_event_source *s, uint64_t
* it. In either case, go through the event loop again and select a new candidate if
* pressure is still high. */
m->mem_pressure_post_action_delay_start = usec_now;
if (selected && r > 0)
if (selected && r > 0) {
log_notice("Killed %s due to memory pressure for %s being %lu.%02lu%% > %lu.%02lu%%"
" for > %s with reclaim activity",
selected, t->path,
LOADAVG_INT_SIDE(t->memory_pressure.avg10), LOADAVG_DECIMAL_SIDE(t->memory_pressure.avg10),
LOADAVG_INT_SIDE(t->mem_pressure_limit), LOADAVG_DECIMAL_SIDE(t->mem_pressure_limit),
FORMAT_TIMESPAN(m->default_mem_pressure_duration_usec, USEC_PER_SEC));
/* send dbus signal */
(void) sd_bus_emit_signal(m->bus,
"/org/freedesktop/oom1",
"org.freedesktop.oom1.Manager",
"Killed",
"ss",
selected,
"memory-pressure");
}
return 0;
}
}