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During LLC load balancing, first check for tasks that prefer the destination LLC and balance them to it before others. Mark source sched groups containing tasks preferring non local LLCs with the group_llc_balance flag. This ensures the load balancer later pulls or pushes these tasks toward their preferred LLCs. The priority of group_llc_balance is lower than that of group_overloaded and higher than that of all other group types. This is because group_llc_balance may exacerbate load imbalance, and if the LLC balancing attempt fails, the nr_balance_failed mechanism will trigger other group types to rebalance the load. The load balancer selects the busiest sched_group and migrates tasks to less busy groups to distribute load across CPUs. With cache-aware scheduling enabled, the busiest sched_group is the one with most tasks preferring the destination LLC. If the group has the llc_balance flag set, cache aware load balancing is triggered. Introduce the helper function update_llc_busiest() to identify the sched_group with the most tasks preferring the destination LLC. Suggested-by: K Prateek Nayak <kprateek.nayak@amd.com> Suggested-by: Madadi Vineeth Reddy <vineethr@linux.ibm.com> Co-developed-by: Chen Yu <yu.c.chen@intel.com> Signed-off-by: Chen Yu <yu.c.chen@intel.com> Signed-off-by: Tim Chen <tim.c.chen@linux.intel.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Link: https://patch.msgid.link/baa458f45eab3f602af090c6d6af63dc864f5ec6.1775065312.git.tim.c.chen@linux.intel.com |
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| .. | ||
| autogroup.c | ||
| autogroup.h | ||
| build_policy.c | ||
| build_utility.c | ||
| clock.c | ||
| completion.c | ||
| core_sched.c | ||
| core.c | ||
| cpuacct.c | ||
| cpudeadline.c | ||
| cpudeadline.h | ||
| cpufreq_schedutil.c | ||
| cpufreq.c | ||
| cpupri.c | ||
| cpupri.h | ||
| cputime.c | ||
| deadline.c | ||
| debug.c | ||
| ext_idle.c | ||
| ext_idle.h | ||
| ext_internal.h | ||
| ext.c | ||
| ext.h | ||
| fair.c | ||
| features.h | ||
| idle.c | ||
| isolation.c | ||
| loadavg.c | ||
| Makefile | ||
| membarrier.c | ||
| pelt.c | ||
| pelt.h | ||
| psi.c | ||
| rq-offsets.c | ||
| rt.c | ||
| sched-pelt.h | ||
| sched.h | ||
| smp.h | ||
| stats.c | ||
| stats.h | ||
| stop_task.c | ||
| swait.c | ||
| syscalls.c | ||
| topology.c | ||
| wait_bit.c | ||
| wait.c | ||