Balbir Singh wrote:Dave Hansen wrote:On Fri, 2006-09-08 at 11:33 +0400, Pavel Emelianov wrote:I think of guarantees w.r.t resources as the lower limit on the resource.I'm afraid we have different understandings of what a "guarantee" is.It appears so.
Don't we?A "death sentence" guarantee? I like it. :)
Guarantee may be one of
1. container will be able to touch that number of pages
2. container will be able to sys_mmap() that number of pages
3. container will not be killed unless it touches that number of
pages
4. anything else
Let's decide what kind of a guarantee we want.
Guarantees and limits can be thought of as the range (guarantee, limit]
for the usage of the resource.
I think of it as: "I will be allowed to use this many total pages, andYes, totally agree.
they are guaranteed not to fail." (1), I think. The sum of all of the
system's guarantees must be less than or equal to the amount of free
memory on the machine.
Such a guarantee is really a limit and this limit is even harder than
BC's one :)
E.g. I have a node with 1Gb of ram and 10 containers with 100Mb
guarantee each.
I want to start one more. What shall I do not to break guarantees?
If we knew to which NUMA node the memory was going to go, we might as
well take the pages out of the allocator.
-- Dave