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Date: Fri, 26 Oct 2007 14:59:01 -0700 From: Martin Bligh <mbligh@...igh.org> To: Rik van Riel <riel@...hat.com> Cc: Andrew Morton <akpm@...ux-foundation.org>, marcelo@...ck.org, linux-kernel@...r.kernel.org, drepper@...hat.com, linux-mm@...ck.org Subject: Re: OOM notifications Rik van Riel wrote: > On Fri, 26 Oct 2007 14:11:12 -0700 > Andrew Morton <akpm@...ux-foundation.org> 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? - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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