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SubjectRe: the new VMt
On Tue, Sep 26, 2000 at 10:54:23AM +0100, Stephen C. Tweedie wrote:
> Beancounter is a framework for user-level accounting. _What_ you
> account is up to the callers. Maybe this has been a miscommunication,
> but beancounter is all about allowing callers to account for stuff
> before allocation, not about having the page allocation functions
> themselves enforce quotas.

per-user and system-wide and per-process quotas are one thing, a
pre-allocate-and-then-allocate generic scheme seems to me to be a error prone
way of getting there. In particular, I think it is dangerous to have a pre-count that
is approximately tethered to the thing it is counting -- in the memory allocation
we were discussing, you need to make sure that the pre-allocations are for memory that
is really going to be allocated soon and that it is later correlated with free in
some way.

So, to me, a quota bounded allocate_page_table(process_id) makes much more sense then
pre-allocate counting, or, even worse, a "smart" kmalloc that never fails.
If the problem is unaccounted for page-tables then account for
page tables and return a -EYOURPROCESSISOUTOFCONTROL so that calling kernel code
can take the responsible action.

Victor Yodaiken
Finite State Machine Labs: The RTLinux Company.

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