Re: [PATCH 1/2] mm,vmscan: Kill global shrinker lock.

[Shakeel Butt]

On Fri, Nov 17, 2017 at 9:35 AM, Christoph Hellwig <hch@xxxxxxxxxxxxx> 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.