Re: Linux is 'creating' memory ?!

In article <3k3i4c$341 <at> vixen.cso.uiuc.edu>,
Steve Peltz <peltz <at> cerl.uiuc.edu> wrote:
>
>Doesn't an mmap'ed segment get swapped to the file itself (other than
>ANON)? Why would it need to reserve swap space?

Check out MAP_PRIVATE, which is actually the one that is used a lot more
than MAP_SHARED (and is the only form fully implemented under linux,
just for that reason). 

>>2) GNU emacs (ugh) wants to start up a shell script.  In the meantime,
>>   GNU emacs has (as it's wont to do) grown to 17 MB, and you obviously
>>   don't have much memory left. Do you accept the fork?
>
>So you have 17MB of swap space that you have to have free for a millisecond
>in order to fork a process from a huge process. Is that such a problem? It
>will be freed up almost immediately.

Are all people writing to this thread so arrogant?

"is it so hard to do?" "is 17MB of swapspace for a millisecond a
problem?" "Why can DOS do it and Linux not do it?" "Use vfork() instead
of fork()" etc etc..

It IS damned hard to do.

Using 17MB of swap-space is HORRIBLE on a PC.  I have around 500MB of
disk on my two linux-machines, and 17MB of that is noticeable.  Others
have *much* less.