Re: [PATCH v3] memcg: fix soft lockup in the OOM process

[Michal Hocko]

On Tue 14-01-25 10:20:28, Vlastimil Babka wrote:
> On 1/14/25 09:40, Michal Hocko wrote:
> > On Mon 13-01-25 19:45:46, Andrew Morton wrote:
[...]
> >> > For global OOM, system is likely to struggle, do we have to do some
> >> > works to suppress RCU detete?
> >> 
> >> rcu_cpu_stall_reset()?
> > 
> > Do we really care about those? The code to iterate over all processes
> > under RCU is there (basically) since ever and yet we do not seem to have
> > many reports of stalls? Chen's situation is specific to memcg OOM and
> > touching the global case was mostly for consistency reasons.
> 
> Then I'd rather not touch the global case then if it's theoretical?

No strong opinion on this on my side. The only actual reason
touch_softlockup_watchdog is there is becuase it originally had
incorrectly cond_resched there. If half silencing (soft lock up
detector only) disturbs people then let's just drop that hunk.
-- 
Michal Hocko
SUSE Labs