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Date: Wed, 28 Oct 2009 10:37:21 -0700 From: Mike Travis <travis@....com> To: Roland Dreier <rdreier@...co.com> CC: Andi Kleen <ak@...ux.intel.com>, Hidetoshi Seto <seto.hidetoshi@...fujitsu.com>, Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>, "H. Peter Anvin" <hpa@...or.com>, linux-kernel@...r.kernel.org, x86@...nel.org Subject: Re: [PATCH] x86, mce: disable MCE if cpu has no MCE banks Roland Dreier wrote: > > Perhaps they could be also compressed a bit like SRAT. > > Seems like a good idea... but I wonder what the best way to represent > things is. For example I have a 2-socket Nehalem system that shows: > > 2 times: MCA banks CMCI:2 CMCI:3 CMCI:5 CMCI:6 SHD:8 > 6 times: MCA banks CMCI:2 CMCI:3 CMCI:5 SHD:6 SHD:8 > 8 times: MCA banks SHD:2 SHD:3 SHD:5 SHD:6 SHD:8 > > presumably the first line is once per package, the next line is for the > first sibling in all the other cores in a package, and the last line is > for the SMT siblings of all the cores. > > But would we want to accumulate all the different combinations of banks > along with a CPU mask and then print something like: > > CPUs 0 4: MCA banks CMCI:2 CMCI:3 CMCI:5 CMCI:6 SHD:8 > CPUs 1 2 3 5 6 7: MCA banks CMCI:2 CMCI:3 CMCI:5 SHD:6 SHD:8 > CPUs 8 9 10 11 12 13 14 15: MCA banks SHD:2 SHD:3 SHD:5 SHD:6 SHD:8 Or use a cpumask and cpulist_scnprintf which condenses the cpu list nicely. > > of course output like that is going to lead to super-long lines on a > 64-thread system. > > Also I'm not sure of a clean way to implement this; unlike the SRAT > stuff, we need to deal with CPU hotplug so all this at best could be > __cpuinitdata, ie we can't discard it in most configs. > > However the "MCA banks" output definitely is annoying on a 64-thread > system -- the amount of output is far greater than the utility of said > output. So ideas on the best way to reduce this would be appreciated. > > Thanks, > Roland -- 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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