Re: [PATCH v4 1/4] memcg: introduce per-memcg reclaim interface

[Yosry Ahmed <yosryahmed@google.com>]

On Sat, Apr 23, 2022 at 6:30 AM Shakeel Butt <shakeelb@google.com> wrote:
>
> On Thu, Apr 21, 2022 at 11:44:23PM +0000, Yosry Ahmed wrote:
> > From: Shakeel Butt <shakeelb@google.com>
> [...]
> >
> > [yosryahmed@google.com: refreshed to current master, updated commit
> > message based on recent discussions and use cases]
> > Signed-off-by: Shakeel Butt <shakeelb@google.com>
> > Signed-off-by: Yosry Ahmed <yosryahmed@google.com>
>
> You should add "Co-developed-by" tag for yourself here.
>
> > Acked-by: Johannes Weiner <hannes@cmpxchg.org>
> > Acked-by: Michal Hocko <mhocko@suse.com>
> > Acked-by: Wei Xu <weixugc@google.com>
> > Acked-by: Roman Gushchin <roman.gushchin@linux.dev>
> > ---
> >
> [...]
> > +static ssize_t memory_reclaim(struct kernfs_open_file *of, char *buf,
> > +                           size_t nbytes, loff_t off)
> > +{
> > +     struct mem_cgroup *memcg = mem_cgroup_from_css(of_css(of));
> > +     unsigned int nr_retries = MAX_RECLAIM_RETRIES;
> > +     unsigned long nr_to_reclaim, nr_reclaimed = 0;
> > +     int err;
> > +
> > +     buf = strstrip(buf);
> > +     err = page_counter_memparse(buf, "", &nr_to_reclaim);
> > +     if (err)
> > +             return err;
> > +
> > +     while (nr_reclaimed < nr_to_reclaim) {
> > +             unsigned long reclaimed;
> > +
> > +             if (signal_pending(current))
> > +                     return -EINTR;
> > +
> > +             /* This is the final attempt, drain percpu lru caches in the
>
> Fix the comment format. "/*" should be on its own line.
>
> > +              * hope of introducing more evictable pages for
> > +              * try_to_free_mem_cgroup_pages().
> > +              */
>
> No need to send a new version if Andrew can fix these in the mm tree.

I will be sending v5 anyway to address your review comments on the
last patch. I will fix these as well. Thanks!