On Tue, Feb 9, 2021 at 9:57 PM Alexei Starovoitov <alexei.starovoitov@xxxxxxxxx> wrote: > > From: Alexei Starovoitov <ast@xxxxxxxxxx> > > Since sleepable programs are now executing under migrate_disable > the per-cpu maps are safe to use. > The map-in-map were ok to use in sleepable from the time sleepable > progs were introduced. > > Note that non-preallocated maps are still not safe, since there is > no rcu_read_lock yet in sleepable programs and dynamically allocated > map elements are relying on rcu protection. The sleepable programs > have rcu_read_lock_trace instead. That limitation will be addresses > in the future. > > Signed-off-by: Alexei Starovoitov <ast@xxxxxxxxxx> > Acked-by: Andrii Nakryiko <andrii@xxxxxxxxxx> Acked-by: KP Singh <kpsingh@xxxxxxxxxx> Thanks! I actually tested out some of our logic which uses per-cpu maps by switching the programs to their sleepable counterparts
