Messages in this thread | | | Date | Fri, 26 Oct 2007 19:44:09 +0200 | From | Pavel Machek <> | Subject | Re: [RFC 0/3] Recursive reclaim (on __PF_MEMALLOC) |
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Hi!
> > > or > > > > > > - have a global reserve and selectively serves sockets > > > (what I've been doing) > > > > That is a scalability problem on large systems! Global means global > > serialization, cacheline bouncing and possibly livelocks. If we get into > > this global shortage then all cpus may end up taking the same locks > > cycling thought the same allocation paths. > > Dude, breathe, these boxens of yours will never swap over network simply > because you never configure swap. > > And, _no_, it does not necessarily mean global serialisation. By simply > saying there must be N pages available I say nothing about on which node > they should be available, and the way the watermarks work they will be > evenly distributed over the appropriate zones.
Agreed. Scalability of emergency swapping reserved is simply unimportant. Please, lets get swapping to _work_ first, then we can make it faster.
No, I do not think we'll ever see a livelock on this. Pavel -- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.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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