Re: PATCH: allow percentile size of tmpfs (2.5.66 / 2.4.20-pre2)

Ed Tomlinson
2003-04-01T13:27:12Z

CaT wrote:

> I believe the patch below will apply to both the above (I know it does
> to 2.5.66 and 2.4.20-pre2 mm/shmem.c does not look any different so it
> should be fine. :)
>
> Anyways, what this patch does is allow you to specify the max amount of
> memory tmpfs can use as a percentage of available real ram. This (in my
> eyes) is useful so that you do not have to remember to change the
> setting if you want something other then 50% and some of your ram does
> (and you can't replacew it immediately).
>
> Usage of this option is as follows:
>
> tmpfs /dev/shm tmpfs rw,size=63%,noauto 0 0
>
> This is taken from my working system and sets the tmpfs size to 63% of
> my real RAM (256MB). The end result is:
>
> Filesystem 1k-blocks Used Available Use% Mounted on
> /dev/shm/tmp 160868 6776 154092 5% /tmp
>
> I've also tested remounting to silly values (and sane ones) and it all
> works fine with no oopses or freezes and the correct values appearing
> in df.
>
> All up I feel safer using this then a hard value.

What does tmpfs have to do with ram size? Its swappable. This _might_ be
useful for ramfs but for tmpfs, IMHO, its not a good idea.

Ed Tomlinson