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-.\"
-.\" Copyright (c) 1990, Sun Microsystems, Inc.
-.\" Copyright 2021 Oxide Computer Company
-.\"
-.\" The contents of this file are subject to the terms of the
-.\" Common Development and Distribution License (the "License").
-.\" You may not use this file except in compliance with the License.
-.\"
-.\" You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
-.\" or http://www.opensolaris.org/os/licensing.
-.\" See the License for the specific language governing permissions
-.\" and limitations under the License.
-.\"
-.\" When distributing Covered Code, include this CDDL HEADER in each
-.\" file and include the License file at usr/src/OPENSOLARIS.LICENSE.
-.\" If applicable, add the following below this CDDL HEADER, with the
-.\" fields enclosed by brackets "[]" replaced with your own identifying
-.\" information: Portions Copyright [yyyy] [name of copyright owner]
-.\"
-.Dd October 9, 1990
-.Dt TMPFS 7FS
-.Os
-.Sh NAME
-.Nm tmpfs
-.Nd memory based file system
-.Sh SYNOPSIS
-.In sys/mount.h
-.Fo mount
-.Fa "const char *special"
-.Fa "const char *directory"
-.Fa IMS_DATA
-.Fa \(dqtmpfs\(dq
-.Fa NULL
-.Fa 0
-.Fc
-.Sh DESCRIPTION
-.Nm
-is a memory based file system which uses kernel resources relating to the VM
-system and page cache as a file system.
-Once mounted, a
-.Nm
-file system provides standard file operations and semantics.
-.Nm
-is so named because files and directories are not preserved across
-reboot or unmounts, all files residing on a
-.Nm
-file system that is unmounted will be lost.
-.Pp
-.Nm
-file systems can be mounted with the command:
-.Bd -literal -offset indent
-mount -F tmpfs swap directory
-.Ed
-.Pp
-Alternatively, to mount a
-.Nm
-file system on
-.Pa /tmp
-at multi-user startup time
-.Pq maximizing possible performance improvements  ,
-add the following line to
-.Pa /etc/vfstab :
-.Bd -literal -offset indent
-swap \(mi/tmp tmpfs \(mi yes \(mi
-.Ed
-.Pp
-.Nm
-is designed as a performance enhancement which is achieved by caching the writes
-to files residing on a
-.Nm
-file system.
-Performance improvements are most noticeable when a large number of short lived
-files are written and accessed on a
-.Nm
-file system.
-Large compilations with
-.Nm
-mounted on
-.Pa /tmp
-are a good example of this.
-.Pp
-Users of
-.Nm
-should be aware of some constraints involved in mounting a
-.Nm
-file system.
-The resources used by
-.Nm
-are the same as those used when commands are executed
-.Pq for example, swap space allocation .
-This means that large sized
-.Nm
-files can affect the amount of space left over for programs to execute.
-Likewise, programs requiring large amounts of memory use up the space available
-to
-.Nm
-Users running into this constraint
-.Po
-for example, running out of space on
-.Nm
-.Pc
-can allocate more swap space by using the
-.Xr swap 1M
-command.
-.Pp
-Another constraint is that the number of files available in a
-.Nm
-file system is calculated based on the physical memory of the machine and not
-the size of the swap device/partition.
-If you have too many files,
-.Nm
-will print a warning message and you will be unable to create new files.
-You cannot increase this limit by adding swap space.
-.Pp
-Normal file system writes are scheduled to be written to a permanent storage
-medium along with all control information associated with the file
-.Pq for example, modification time, file permissions .
-.Nm
-control information resides only in memory and never needs to be written to
-permanent storage.
-File data remains in core until memory demands are sufficient to cause pages
-associated with
-.Nm
-to be reused at which time they are copied out to swap.
-.Pp
-An additional mount option can be specified to control the size of an individual
-.Nm
-file system.
-See
-.Xr mount_tmpfs 1M
-for more details.
-.Sh DIAGNOSTICS
-If
-.Nm
-runs out of space, one of the following messages will display in the console.
-.Bl -tag -width Ds
-.It "directory: File system full, swap space limit exceeded"
-This message appears because a page could not be allocated while writing to a
-file.
-This can occur if
-.Nm
-is attempting to write more than it is allowed, or if currently executing
-programs are using a lot of memory.
-To make more space available, remove unnecessary files, exit from some programs,
-or allocate more swap space using
-.Xr swap 1M .
-.It "directory: File system full, memory allocation failed"
-.Nm
-ran out of physical memory while attempting to create a new file or
-directory.
-Remove unnecessary files or directories or install more physical memory.
-.El
-.Sh SEE ALSO
-.Xr df 1M ,
-.Xr mount 1M ,
-.Xr mount_tmpfs 1M ,
-.Xr swap 1M ,
-.Xr mmap 2 ,
-.Xr mount 2 ,
-.Xr umount 2 ,
-.Xr vfstab 4
-.Sh WARNINGS
-Files and directories on a
-.Nm
-file system are not preserved across reboots or unmounts.
-Command scripts or programs which count on this will not work as expected.
-.Sh NOTES
-Compilers do not necessarily use
-/tmp
-to write intermediate files therefore missing some significant performance
-benefits.
-This can be remedied by setting the environment variable
-.Ev TMPDIR to
-.Pa /tmp .
-Compilers use
-the value in this environment variable as the name of the directory to store
-intermediate files.
-.Pp
-.Sy swap
-to a
-.Nm
-file is not supported.
-.Pp
-.Xr df 1M
-output is of limited accuracy since a
-.Nm
-file system size
-is not static and the space available to
-.Nm
-is dependent on the swap space demands of the entire system.