Messages in this thread |  | | Date | Wed, 28 Nov 2001 17:30:21 +0000 | From | Padraig Brady <> | Subject | Re: [RFC] Documentation/filesystems/tmpfs |
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Christoph Rohland wrote:
> Hi, > > Apparently there is a lack of information about tmpfs out there.
I aggree, and ramfs et al.
> So I would like to reduce the Configure.help entry and instead > introduce a file Documentation/filesystems/tmpfs with more details. > > My proposal is appended. Feedback about content and english language > is highly appreciated. > > Greetings > Christoph > > ------------------------------------------------------------------------ > > Tmpfs is a file system which keeps all files in virtual memory. > > Everything is temporary in the sense that no files will be created on > your hard drive. If you reboot, everything in tmpfs will be lost. > > In contrast to RAM disks, which get allocated a fixed amount of > physical RAM, tmpfs grows and shrinks to accommodate the files it > contains and is able to swap unneeded pages out to swap space.
That isn't the case now since ramdisks were
integrated with the buffer cache:
$ dd if=/dev/zero of=/tmp/use_mem bs=1024 count=20000 $ cat /proc/meminfo total: used: free: shared: buffers: cached: Mem: 129966080 122720256 7245824 49152 65863680 28745728 Swap: 0 0 0 MemTotal: 126920 kB MemFree: 7076 kB MemShared: 48 kB Buffers: 64320 kB Cached: 28072 kB SwapCached: 0 kB Active: 10308 kB Inact_dirty: 80196 kB Inact_clean: 1936 kB Inact_target: 26200 kB HighTotal: 0 kB HighFree: 0 kB LowTotal: 126920 kB LowFree: 7076 kB SwapTotal: 0 kB SwapFree: 0 kB
$ rm /tmp/use_mem $ cat /proc/meminfo total: used: free: shared: buffers: cached: Mem: 129966080 101957632 28008448 49152 65863680 8290304 Swap: 0 0 0 MemTotal: 126920 kB MemFree: 27352 kB MemShared: 48 kB Buffers: 64320 kB Cached: 8096 kB SwapCached: 0 kB Active: 10352 kB Inact_dirty: 60196 kB Inact_clean: 1916 kB Inact_target: 26200 kB HighTotal: 0 kB HighFree: 0 kB LowTotal: 126920 kB LowFree: 27352 kB SwapTotal: 0 kB SwapFree: 0 kB
Padraig.
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