Re: userspace pagecache management tool

[Andrew Morton]

On Sat, 03 Mar 2007 17:19:00 -0500 Rik van Riel <riel@xxxxxxxxxx> wrote:

> > It is *not* a global instruction.  It uses setenv, so the user's policy
> > affects only the target process and its forked children.
> 
> ... and all other processes accessing the same file(s)!
> 
> Your library and the system calls may be limited to one process,
> but the consequences are global.

Yes.  So what?  If the user wants to go and evict libc.so from pagecache
then he can do so - the kernel has provided syscalls with which this can be
done for at least seven years.  Bad user, shouldn't do that.

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