Messages in this thread | | | Date | Sat, 03 Mar 2007 17:19:00 -0500 | From | Rik van Riel <> | Subject | Re: userspace pagecache management tool |
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Andrew Morton wrote: > On Sat, 3 Mar 2007 22:41:09 +0100 bert hubert <bert.hubert@netherlabs.nl> wrote: > >>> How can you make global policy decisions based on the intent >>> of one program? >> By not doing so. > > yup. > >> Andrew's program is fine in principle, except that the >> linux kernel treats the communication of a program's intent as a global >> instruction. > > argh. > > That felt good - let's do it again. > > argh. > > > 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.
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