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Index: lib/libc/sys/getrlimit.2
===================================================================
--- lib/libc/sys/getrlimit.2
+++ lib/libc/sys/getrlimit.2
@@ -28,7 +28,7 @@
.\" @(#)getrlimit.2 8.1 (Berkeley) 6/4/93
.\" $FreeBSD$
.\"
-.Dd August 20, 2008
+.Dd August 19, 2015
.Dt GETRLIMIT 2
.Os
.Sh NAME
@@ -74,6 +74,8 @@
function.
.It Dv RLIMIT_FSIZE
The largest size (in bytes) file that may be created.
+.It Dv RLIMIT_KQUEUES
+The maximum number of kqueues created by this user id.
.It Dv RLIMIT_MEMLOCK
The maximum size (in bytes) which a process may lock into memory
using the
@@ -83,12 +85,15 @@
The maximum number of open files for this process.
.It Dv RLIMIT_NPROC
The maximum number of simultaneous processes for this user id.
+.It Dv RLIMIT_NPTS
+The maximum number of pseudo-terminals created by this user id.
.It Dv RLIMIT_RSS
-The maximum size (in bytes) to which a process's resident set size may
-grow.
-This imposes a limit on the amount of physical memory to be given to
-a process; if memory is tight, the system will prefer to take memory
+The maximum size (in bytes) a process's resident set size may
+maintain in main memory if swap is available and there is memory pressure.
+If memory is tight and swap is enabled, the system will prefer to take memory
from processes that are exceeding their declared resident set size.
+On systems that are not under memory pressure or do not have sufficient swap,
+this effectively imposes no limit on a process' memory use.
.It Dv RLIMIT_SBSIZE
The maximum size (in bytes) of socket buffer usage for this user.
This limits the amount of network memory, and hence the amount of
@@ -106,10 +111,9 @@
Please see
.Xr tuning 7
for a complete description of this sysctl.
-.It Dv RLIMIT_NPTS
-The maximum number of pseudo-terminals created by this user id.
-.It Dv RLIMIT_KQUEUES
-The maximum number of kqueues created by this user id.
+.It Dv RLIMIT_VMEM
+An alias for
+.Dv RLIMIT_AS .
.El
.Pp
A resource limit is specified as a soft limit and a hard limit.
@@ -170,6 +174,22 @@
.Dv SIGXCPU
is sent to the
offending process.
+.Pp
+When a
+.Xr mmap 2
+would allocate more virtual memory than allowed by the soft limit of
+.Dv RLIMIT_AS
+or
+.Dv RLIMIT_VMEM ,
+no signal is raised; however, the operation fails with
+.Dv ENOMEM .
+The caller is free to raise the soft address space limit up to the hard limit
+and retry the allocation.
+.Pp
+.Dv RLIMIT_RSS
+does not signal or kill processes that exceed their nominal RSS limits; it is
+simply a hint to the vm swap daemon to prefer to evict pages from any such
+process to swap.
.Sh RETURN VALUES
.Rv -std
.Sh ERRORS

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