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@@ -1,4 +1,20 @@
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/* drivers/misc/lowmemorykiller.c
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+ *
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+ * The lowmemorykiller driver lets user-space specify a set of memory thresholds
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+ * where processes with a range of oom_adj values will get killed. Specify the
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+ * minimum oom_adj values in /sys/module/lowmemorykiller/parameters/adj and the
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+ * number of free pages in /sys/module/lowmemorykiller/parameters/minfree. Both
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+ * files take a comma separated list of numbers in ascending order.
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+ *
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+ * For example, write "0,8" to /sys/module/lowmemorykiller/parameters/adj and
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+ * "1024,4096" to /sys/module/lowmemorykiller/parameters/minfree to kill processes
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+ * with a oom_adj value of 8 or higher when the free memory drops below 4096 pages
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+ * and kill processes with a oom_adj value of 0 or higher when the free memory
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+ * drops below 1024 pages.
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+ *
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+ * The driver considers memory used for caches to be free, but if a large
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+ * percentage of the cached memory is locked this can be very inaccurate
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+ * and processes may not get killed until the normal oom killer is triggered.
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*
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* Copyright (C) 2007-2008 Google, Inc.
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*
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