On Intel systems the memory bandwidth monitoring events are independently enumerated. It is possible for a system to support total memory bandwidth monitoring, but not support local bandwidth monitoring. On such a system a user could not enable mba_sc mode. Modify the existing "mba_MBps" mount option to switch to total bandwidth monitoring if local monitoring is not available. Signed-off-by: Tony Luck <tony.luck@xxxxxxxxx> --- arch/x86/kernel/cpu/resctrl/rdtgroup.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c index 606cf635ea94..433daaa4d125 100644 --- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c +++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c @@ -2777,6 +2777,8 @@ static int rdt_parse_param(struct fs_context *fc, struct fs_parameter *param) return invalfc(fc, msg); if (is_mbm_local_enabled()) ctx->mba_mbps_event = QOS_L3_MBM_LOCAL_EVENT_ID; + else if (is_mbm_total_enabled()) + ctx->mba_mbps_event = QOS_L3_MBM_TOTAL_EVENT_ID; else return invalfc(fc, msg); ctx->enable_mba_mbps = true; -- 2.46.1
