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On Thu, Dec 08, 2005 at 06:26:32AM +0100, Andi Kleen wrote: Hi Andi, > > Whilst debugging a memory leak, I hit sysrq meminfo, > > and got hot/cold info for CONFIG_NR_CPUS rather than 4 cpus > > > > I've only tried reproducing this on x86-64 so far. > > If the online map is wrong all kinds of things would go wrong. > > Most likely your kernel doesn't have the fix. This was seen with a .15rc5-git1 kernel. Is this something still living in your x86-64 patchset or -mm ? > The possible map is fixed kind of BTW in 2.6.15rc*. It was a side effect > of CPU hotplug, which now uses a better algorithm to guess the > number of possible CPUs. In 2.6.15 you will just get half the number > of available CPUs in addition by default Yep, I noticed it offers a maximum of 6 cpus on my way. As a sidenote, seems kinda funny (and wasteful maybe?), doing this on a lot of hardware that isn't hotplug capable. (Whilst I could disable cpu hotplug in my local build, this isn't an answer for a generic distro kernel). Dave - 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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