On Fri, Nov 17, 2017 at 09:41:46AM -0800, Shakeel Butt wrote: > On Fri, Nov 17, 2017 at 9:35 AM, Christoph Hellwig <h...@infradead.org> wrote: > > On Tue, Nov 14, 2017 at 06:37:42AM +0900, Tetsuo Handa wrote: > >> Since do_shrink_slab() can reschedule, we cannot protect shrinker_list > >> using one RCU section. But using atomic_inc()/atomic_dec() for each > >> do_shrink_slab() call will not impact so much. > > > > But you could use SRCU.. > > I looked into that but was advised to not go through that route due to > SRCU behind the CONFIG_SRCU. However now I see the precedence of > "#ifdef CONFIG_SRCU" in drivers/base/core.c and I think if we can take > that route if even after Minchan's patch the issue persists.
To be honest, I'd rather always require RCU then have core kernel code reinvent it.
