Rik van Riel wrote:
On Fri, 26 Oct 2007 14:11:12 -0700
Andrew Morton <[email protected]> wrote:
Sure, but in terms of high-level userspace interface, being able to
select() on a group of priority buckets (spread across different
nodes, zones and cgroups) seems a lot more flexible than any
signal-based approach we could come up with.
Absolutely, the process needs to be able to just poll or
select on a file descriptor from the process main loop.
I am not convinced that the magic of NUMA memory distribution
and NUMA memory pressure should be visible to userspace. Due
to the thundering herd problem we cannot wake up all of the
processes that select on the filedescriptor at the same time
anyway, so we can (later on) add NUMA magic to the process
selection logic in the kernel to only wake up processes on
the right NUMA nodes.
The initial patch probably does not need that.
Depends if you're using cpusets or not, I think?
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