Hello,
In the context of the perfmon2 subsystem for processor with HyperThreading, we need to know on which thread we are currently running. This comes from the fact that the performance counters are shared between the two threads. We use the thread id (smt_id) because we split the counters in half between the two threads such that two threads on the same core can run with monitoring on. We are currently computing the smt_id from the apicid as returned by a CPUID instruction. This is not very efficient. I looked through the i386 code and could not find a function nor structure that would return this smt_id. In the cpuinfo_x86 structure there is an apicid field that looks good, yet it does not seem to be initialized nor used. Is cpuinfo_x86->apicid field obsolete? If so, what is replacing it? Thanks. -- -Stephane _______________________________________________ perfmon mailing list [email protected] http://www.hpl.hp.com/hosted/linux/mail-archives/perfmon/
