Hi Stephane, I found the following comment in your code:
pfm_core_restore_pmcs() at perfmon_intel_core.c 488 /* 489 * must restore DS pointer before restoring PMCs 490 * as this can potentially reactivate monitoring 491 */ 492 if (ctx_arch->ds_area) 493 wrmsrl(MSR_IA32_DS_AREA, (unsigned long)ctx_arch->ds_area); 494 495 for_each_bit(i, cast_ulp(set->used_pmcs), PFM_CORE_NUM_PMCS) 496 wrmsrl(pfm_pmu_conf->pmc_desc[i].hw_addr, set->pmcs[i]); What do you mean this can potentially reactivate monitoring? I met some strange problems when I save and restore PMCs. Although I disabled performance monitoring by clearing the enable bit in PMD, still sometimes some PMCs overflowed after I restored them. I'm not sure if they really overflowed, but at least I saw NMIs occurred later. So in your comment, do you mean the similar problem? Thanks, Jiaqing ------------------------------------------------------------------------------ Return on Information: Google Enterprise Search pays you back Get the facts. http://p.sf.net/sfu/google-dev2dev _______________________________________________ perfmon2-devel mailing list perfmon2-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/perfmon2-devel
