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SubjectRe: [RFC][PATCH 0/6] Critical Page Pool
Andrea Arcangeli wrote:
> On Wed, Dec 14, 2005 at 11:08:41AM +0100, Pavel Machek wrote:
>>because reserved memory pool would have to be "sum of all network
>>interface bandwidths * ammount of time expected to survive without
>>network" which is way too much.
> Yes, a global pool isn't really useful. A per-subsystem pool would be
> more reasonable...

Which is an idea that I toyed with, as well. The problem that I ran into
is how to tag an allocation as belonging to a specific subsystem. For
example, in our code we need networking to use the critical pool. How do
we let __alloc_pages() know what allocations belong to networking?
Networking needs named slab allocations, kmalloc allocations, and whole
page allocations to function. Should each subsystem get it's own GFP flag
create these pools dynamically and pass a reference to which pool each
specific allocation uses (thus adding a parameter to all memory allocation
functions in the kernel)? I realize that per-subsystem pools would be
better, but I thought about this for a while and couldn't come up with a
reasonable way to do it.

>>gigabytes into your machine. But don't go introducing infrastructure
>>that _can't_ be used right.
> Agreed, the current design of the patch can't be used right.

Well, it can for our use, but I recognize that isn't going to be a huge
selling point! :) As I mentioned in my reply to Pavel, I'd really like to
find a way to design something that WOULD be generally useful.


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