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cgroup: get rid of MemorySoftLimit=

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The cgroup attribute memory.soft_limit_in_bytes is unlikely to stay
around in the kernel for good, so let's not expose it for now. We can
readd something like it later when the kernel guys decided on a final
API for this.
This commit is contained in:
Lennart Poettering 2013-09-17 14:58:00 -05:00
parent 387abf80ad
commit ddca82aca0
9 changed files with 12 additions and 43 deletions
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2
TODO
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@ -60,8 +60,6 @@ Features:
* always set memory.user_hierarchy for all cgroups we create
* Get rid of MemorySoftLimit=
* After coming back from hibernation reset hibernation swap partition
* mounts: do not test each mount unit against each other mount unit to

15
man/systemd.cgroup.xml
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@ -136,22 +136,17 @@ along with systemd; If not, see <http://www.gnu.org/licenses/>.
<varlistentry>
<term><varname>MemoryLimit=<replaceable>bytes</replaceable></varname></term>
<term><varname>MemorySoftLimit=<replaceable>bytes</replaceable></varname></term>
<listitem>
<para>Specify the hard and soft limits on maximum memory
usage of the executed processes. The "hard" limit specifies
how much process and kernel memory can be used by tasks in
this unit, when there is no memory contention. If the kernel
detects memory contention, memory reclaim will be performed
until the memory usage is within the "soft" limit. Takes a
<para>Specify the limit on maximum memory usage of the
executed processes. The limit specifies how much process and
kernel memory can be used by tasks in this unit. Takes a
memory size in bytes. If the value is suffixed with K, M, G
or T, the specified memory size is parsed as Kilobytes,
Megabytes, Gigabytes, or Terabytes (with the base 1024),
respectively. This controls the
<literal>memory.limit_in_bytes</literal> and
<literal>memory.soft_limit_in_bytes</literal> control group
attributes. For details about these control group attributes,
<literal>memory.limit_in_bytes</literal> control group
attribute. For details about this control group attribute,
see <ulink
url="https://www.kernel.org/doc/Documentation/cgroups/memory.txt">memory.txt</ulink>.</para>

16
src/core/cgroup.c
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@ -33,7 +33,7 @@ void cgroup_context_init(CGroupContext *c) {
* structure is preinitialized to 0 */
c->cpu_shares = 1024;
c->memory_limit = c->memory_soft_limit = (uint64_t) -1;
c->memory_limit = (uint64_t) -1;
c->blockio_weight = 1000;
}
@ -94,7 +94,6 @@ void cgroup_context_dump(CGroupContext *c, FILE* f, const char *prefix) {
"%sCPUShares=%lu\n"
"%sBlockIOWeight=%lu\n"
"%sMemoryLimit=%" PRIu64 "\n"
"%sMemorySoftLimit=%" PRIu64 "\n"
"%sDevicePolicy=%s\n",
prefix, yes_no(c->cpu_accounting),
prefix, yes_no(c->blockio_accounting),
@ -102,7 +101,6 @@ void cgroup_context_dump(CGroupContext *c, FILE* f, const char *prefix) {
prefix, c->cpu_shares,
prefix, c->blockio_weight,
prefix, c->memory_limit,
prefix, c->memory_soft_limit,
prefix, cgroup_device_policy_to_string(c->device_policy));
LIST_FOREACH(device_allow, a, c->device_allow)
@ -265,15 +263,6 @@ void cgroup_context_apply(CGroupContext *c, CGroupControllerMask mask, const cha
if (r < 0)
log_error("Failed to set memory.limit_in_bytes on %s: %s", path, strerror(-r));
if (c->memory_soft_limit != (uint64_t) -1) {
sprintf(buf, "%" PRIu64 "\n", c->memory_soft_limit);
r = cg_set_attribute("memory", path, "memory.soft_limit_in_bytes", buf);
} else
r = cg_set_attribute("memory", path, "memory.soft_limit_in_bytes", "-1");
if (r < 0)
log_error("Failed to set memory.soft_limit_in_bytes on %s: %s", path, strerror(-r));
}
if (mask & CGROUP_DEVICE) {
@ -336,8 +325,7 @@ CGroupControllerMask cgroup_context_get_mask(CGroupContext *c) {
mask |= CGROUP_BLKIO;
if (c->memory_accounting ||
c->memory_limit != (uint64_t) -1 ||
c->memory_soft_limit != (uint64_t) -1)
c->memory_limit != (uint64_t) -1)
mask |= CGROUP_MEMORY;
if (c->device_allow || c->device_policy != CGROUP_AUTO)

1
src/core/cgroup.h
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@ -77,7 +77,6 @@ struct CGroupContext {
LIST_HEAD(CGroupBlockIODeviceBandwidth, blockio_device_bandwidths);
uint64_t memory_limit;
uint64_t memory_soft_limit;
CGroupDevicePolicy device_policy;
LIST_HEAD(CGroupDeviceAllow, device_allow);

10
src/core/dbus-cgroup.c
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@ -133,7 +133,6 @@ const BusProperty bus_cgroup_context_properties[] = {
{ "BlockIOWriteBandwidth", bus_cgroup_append_device_bandwidths, "a(st)", 0 },
{ "MemoryAccounting", bus_property_append_bool, "b", offsetof(CGroupContext, memory_accounting) },
{ "MemoryLimit", bus_property_append_uint64, "t", offsetof(CGroupContext, memory_limit) },
{ "MemorySoftLimit", bus_property_append_uint64, "t", offsetof(CGroupContext, memory_soft_limit) },
{ "DevicePolicy", bus_cgroup_append_device_policy, "s", offsetof(CGroupContext, device_policy) },
{ "DeviceAllow", bus_cgroup_append_device_allow, "a(ss)", 0 },
{}
@ -418,21 +417,16 @@ int bus_cgroup_set_property(
return 1;
} else if (streq(name, "MemoryLimit") || streq(name, "MemorySoftLimit")) {
} else if (streq(name, "MemoryLimit")) {
if (dbus_message_iter_get_arg_type(i) != DBUS_TYPE_UINT64)
return -EINVAL;
if (mode != UNIT_CHECK) {
uint64_t limit;
dbus_message_iter_get_basic(i, &limit);
if (streq(name, "MemoryLimit"))
c->memory_limit = limit;
else
c->memory_soft_limit = limit;
c->memory_limit = limit;
unit_write_drop_in_private_format(u, mode, name, "%s=%" PRIu64, name, limit);
}

1
src/core/dbus-cgroup.h
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@ -37,7 +37,6 @@
" <property name=\"BlockIOWriteBandwidth=\" type=\"a(st)\" access=\"read\"/>\n" \
" <property name=\"MemoryAccounting\" type=\"b\" access=\"read\"/>\n" \
" <property name=\"MemoryLimit\" type=\"t\" access=\"read\"/>\n" \
" <property name=\"MemorySoftLimit\" type=\"t\" access=\"read\"/>\n" \
" <property name=\"DevicePolicy\" type=\"s\" access=\"read\"/>\n" \
" <property name=\"DeviceAllow\" type=\"a(ss)\" access=\"read\"/>\n"

1
src/core/load-fragment-gperf.gperf.m4
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@ -89,7 +89,6 @@ $1.CPUAccounting, config_parse_bool, 0,
$1.CPUShares, config_parse_cpu_shares, 0, offsetof($1, cgroup_context)
$1.MemoryAccounting, config_parse_bool, 0, offsetof($1, cgroup_context.memory_accounting)
$1.MemoryLimit, config_parse_memory_limit, 0, offsetof($1, cgroup_context)
$1.MemorySoftLimit, config_parse_memory_limit, 0, offsetof($1, cgroup_context)
$1.DeviceAllow, config_parse_device_allow, 0, offsetof($1, cgroup_context)
$1.DevicePolicy, config_parse_device_policy, 0, offsetof($1, cgroup_context.device_policy)
$1.BlockIOAccounting, config_parse_bool, 0, offsetof($1, cgroup_context.blockio_accounting)

7
src/core/load-fragment.c
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@ -2036,14 +2036,11 @@ int config_parse_memory_limit(
void *userdata) {
CGroupContext *c = data;
uint64_t *limit;
off_t bytes;
int r;
limit = streq(lvalue, "MemoryLimit") ? &c->memory_limit : &c->memory_soft_limit;
if (isempty(rvalue)) {
*limit = (uint64_t) -1;
c->memory_limit = (uint64_t) -1;
return 0;
}
@ -2056,7 +2053,7 @@ int config_parse_memory_limit(
return 0;
}
*limit = (uint64_t) bytes;
c->memory_limit = (uint64_t) bytes;
return 0;
}

2
src/systemctl/systemctl.c
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@ -3657,7 +3657,7 @@ static int append_assignment(DBusMessageIter *iter, const char *assignment) {
!dbus_message_iter_append_basic(&sub, DBUS_TYPE_BOOLEAN, &b))
return log_oom();
} else if (streq(field, "MemoryLimit") || streq(field, "MemorySoftLimit")) {
} else if (streq(field, "MemoryLimit")) {
off_t bytes;
uint64_t u;