| @@ -1213,23 +1213,25 @@ PAGE_SIZE multiple when read back. · 1212 unmodified lines |
| 1213 | 1213 | A read-write single value file which exists on non-root |
| 1214 | 1214 | cgroups. The default is "max". |
| 1215 | 1215 | |
| 1216 | | − Memory usage throttle limit. This is the main mechanism to |
| 1217 | | − control memory usage of a cgroup. If a cgroup's usage goes |
| 1216 | + Memory usage throttle limit. If a cgroup's usage goes |
| 1218 | 1217 | over the high boundary, the processes of the cgroup are |
| 1219 | 1218 | throttled and put under heavy reclaim pressure. |
| 1220 | 1219 | |
| 1221 | 1220 | Going over the high limit never invokes the OOM killer and |
| 1222 | | − under extreme conditions the limit may be breached. |
| 1221 | + under extreme conditions the limit may be breached. The high |
| 1222 | + limit should be used in scenarios where an external process |
| 1223 | + monitors the limited cgroup to alleviate heavy reclaim |
| 1224 | + pressure. |
| 1223 | 1225 | |
| 1224 | 1226 | memory.max |
| 1225 | 1227 | A read-write single value file which exists on non-root |
| 1226 | 1228 | cgroups. The default is "max". |
| 1227 | 1229 | |
| 1228 | | − Memory usage hard limit. This is the final protection |
| 1229 | | − mechanism. If a cgroup's memory usage reaches this limit and |
| 1230 | | − can't be reduced, the OOM killer is invoked in the cgroup. |
| 1231 | | − Under certain circumstances, the usage may go over the limit |
| 1232 | | − temporarily. |
| 1230 | + Memory usage hard limit. This is the main mechanism to limit |
| 1231 | + memory usage of a cgroup. If a cgroup's memory usage reaches |
| 1232 | + this limit and can't be reduced, the OOM killer is invoked in |
| 1233 | + the cgroup. Under certain circumstances, the usage may go |
| 1234 | + over the limit temporarily. |
| 1233 | 1235 | |
| 1234 | 1236 | In default configuration regular 0-order allocations always |
| 1235 | 1237 | succeed unless OOM killer chooses current task as a victim. |
| @@ -1238,10 +1240,6 @@ PAGE_SIZE multiple when read back. · 2 unmodified lines |
| 1238 | 1240 | Caller could retry them differently, return into userspace |
| 1239 | 1241 | as -ENOMEM or silently ignore in cases like disk readahead. |
| 1240 | 1242 | |
| 1241 | | − This is the ultimate protection mechanism. As long as the |
| 1242 | | − high limit is used and monitored properly, this limit's |
| 1243 | | − utility is limited to providing the final safety net. |
| 1244 | | − |
| 1245 | 1243 | memory.reclaim |
| 1246 | 1244 | A write-only nested-keyed file which exists for all cgroups. |
| 1247 | 1245 | |