sched/isolation: Introduce isolated task work
Some asynchronous kernel work may be pending upon resume to userspace
and execute later on. On isolated workload this becomes problematic once
the process is done with preparatory work involving syscalls and wants
to run in userspace without being interrupted.
Provide an infrastructure to queue a work to be executed from the current
isolated task context right before resuming to userspace. This goes with
the assumption that isolated tasks are pinned to a single nohz_full CPU.
Cc: Frederic Weisbecker <frederic@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Valentin Schneider <vschneid@redhat.com>
Cc: Marcelo Tosatti <mtosatti@redhat.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: linux-mm@kvack.org
Signed-off-by: Frederic Weisbecker <frederic@kernel.org>
5 files changed
