On Wed, May 05, 2021 at 12:59:43PM +0200, Peter Zijlstra wrote: > The situation around sched_info is somewhat complicated, it is used by > sched_stats and delayacct and, indirectly, kvm. > > If SCHEDSTATS=Y (but disabled by default) sched_info_on() is > unconditionally true -- this is the case for all distro kernel configs > I checked. > > If for some reason SCHEDSTATS=N, but TASK_DELAY_ACCT=Y, then > sched_info_on() can return false when delayacct is disabled, > presumably because there would be no other users left; except kvm is. > > Instead of complicating matters further by accurately accounting > sched_stat and kvm state, simply unconditionally enable when > SCHED_INFO=Y, matching the common distro case. > > Signed-off-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx> Acked-by: Johannes Weiner <hannes@xxxxxxxxxxx>
