Messages in this thread Patch in this message | | | From | Ricardo Neri <> | Subject | [RFC PATCH 18/23] sched/task_struct: Add helpers for task classification | Date | Fri, 9 Sep 2022 16:12:00 -0700 |
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The unprocessed classification that hardware provides for a task may not be usable by the scheduler. The classification may change too frequently. An arch-specific implementation may want to consider other factors. For instance, Intel Thread Director considers the state of the SMT siblings of core.
Provide per-task helper variables that architectures can use to post- process the classification that hardware provides.
Cc: Ben Segall <bsegall@google.com> Cc: Daniel Bristot de Oliveira <bristot@redhat.com> Cc: Dietmar Eggemann <dietmar.eggemann@arm.com> Cc: Len Brown <len.brown@intel.com> Cc: Mel Gorman <mgorman@suse.de> Cc: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Cc: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Tim C. Chen <tim.c.chen@intel.com> Cc: Valentin Schneider <vschneid@redhat.com> Cc: x86@kernel.org Cc: linux-kernel@vger.kernel.org Signed-off-by: Ricardo Neri <ricardo.neri-calderon@linux.intel.com> --- signed char and unsigned char are both signed in riscv architecture. Use a signed char to avoid compilation warnings. --- include/linux/sched.h | 10 ++++++++++ 1 file changed, 10 insertions(+)
diff --git a/include/linux/sched.h b/include/linux/sched.h index 73f9e745d17d..6c8907622f00 100644 --- a/include/linux/sched.h +++ b/include/linux/sched.h @@ -1517,6 +1517,16 @@ struct task_struct { #ifdef CONFIG_SCHED_TASK_CLASSES /* Class of task that the scheduler uses for task placement decisions */ short class; + /* + * A candidate classification that arch-specific implementations + * qualify for correctness. + */ + short class_candidate; + /* + * Counter to filter out transient the candidate classification + * of a task + */ + char class_debounce_counter; #endif /* -- 2.25.1
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