On Mon, Dec 04, 2023 at 10:53:49AM -0800, Tony Luck wrote: Boris: I've collected "Reviewed-by:" from Reinette for all patches. Babu sent a Tested-by for the series, and Reviewed-by for each patch just now. So it's ready to got into your to-be-reviewed queue. Thanks -Tony > The Sub-NUMA cluster feature on some Intel processors partitions the CPUs > that share an L3 cache into two or more sets. This plays havoc with the > Resource Director Technology (RDT) monitoring features. Prior to this > patch Intel has advised that SNC and RDT are incompatible. > > Some of these CPU support an MSR that can partition the RMID counters in > the same way. This allows monitoring features to be used. With the caveat > that users must be aware that Linux may migrate tasks more frequently > between SNC nodes than between "regular" NUMA nodes, so reading counters > from all SNC nodes may be needed to get a complete picture of activity > for tasks. > > Cache and memory bandwidth allocation features continue to operate at > the scope of the L3 cache. > > Signed-off-by: Tony Luck <tony.luck@xxxxxxxxx> > > Changes since v12: > > All: > Reinette - put commit tags in right order for TIP (Tested-by before > Reviewed-by) > > Patch 7: > Fam Zheng - Check for -1 return from get_cpu_cacheinfo_id() and > increase size of bitmap tracking # of L3 instances. > Reinette - Add extra sanity checks. Note that this patch has > some additional tweaks beyond the e-mail discussion. > 1) "3" is a valid return in addition to 1, 2, 4 > 2) Added a warning if the sanity checks fail that > prints number of CPU nodes and number of L3 cache > instances that were found. > > Patch 8: > Babu - Fix grammar with an additional comma. > > > Tony Luck (8): > x86/resctrl: Prepare for new domain scope > x86/resctrl: Prepare to split rdt_domain structure > x86/resctrl: Prepare for different scope for control/monitor > operations > x86/resctrl: Split the rdt_domain and rdt_hw_domain structures > x86/resctrl: Add node-scope to the options for feature scope > x86/resctrl: Introduce snc_nodes_per_l3_cache > x86/resctrl: Sub NUMA Cluster detection and enable > x86/resctrl: Update documentation with Sub-NUMA cluster changes > > Documentation/arch/x86/resctrl.rst | 25 +- > include/linux/resctrl.h | 85 +++-- > arch/x86/include/asm/msr-index.h | 1 + > arch/x86/kernel/cpu/resctrl/internal.h | 66 ++-- > arch/x86/kernel/cpu/resctrl/core.c | 433 +++++++++++++++++----- > arch/x86/kernel/cpu/resctrl/ctrlmondata.c | 58 +-- > arch/x86/kernel/cpu/resctrl/monitor.c | 68 ++-- > arch/x86/kernel/cpu/resctrl/pseudo_lock.c | 26 +- > arch/x86/kernel/cpu/resctrl/rdtgroup.c | 149 ++++---- > 9 files changed, 629 insertions(+), 282 deletions(-) > > > base-commit: 2cc14f52aeb78ce3f29677c2de1f06c0e91471ab > -- > 2.41.0 >
