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When triggering an active load balance, sd->nr_balance_failed is set to such a value that any further can_migrate_task() using said sd will ignore the output of task_hot(). This behaviour makes sense, as active load balance intentionally preempts a rq's running task to migrate it right away, but this asynchronous write is a bit shoddy, as the stopper thread might run active_load_balance_cpu_stop before the sd->nr_balance_failed write either becomes visible to the stopper's CPU or even happens on the CPU that appended the stopper work. Add a struct lb_env flag to denote active balancing, and use it in can_migrate_task(). Remove the sd->nr_balance_failed write that served the same purpose. Cleanup the LBF_DST_PINNED active balance special case. Link: https://lkml.kernel.org/r/20210407220628.3798191-3-valentin.schneider@arm.com Change-Id: I95928eae80bd3d5d247e20715d8a1c3ea268fc0f Reviewed-by: Dietmar Eggemann <dietmar.eggemann@arm.com> Reviewed-by: Vincent Guittot <vincent.guittot@linaro.org> Signed-off-by: Valentin Schneider <valentin.schneider@arm.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Signed-off-by: Richard Raya <rdxzv.dev@gmail.com>
Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. Please read the Documentation/process/changes.rst file, as it contains the requirements for building and running the kernel, and information about the problems which may result by upgrading your kernel.