MIME-Version: 1.0
References: <20230202233229.3895713-1-yosryahmed@google.com>
 <20230202233229.3895713-2-yosryahmed@google.com> <Y900tl+kRWoZac/T@casper.infradead.org>
In-Reply-To: <Y900tl+kRWoZac/T@casper.infradead.org>
From:   Yosry Ahmed <yosryahmed@google.com>
Date:   Fri, 3 Feb 2023 14:30:41 -0800
Message-ID: <CAJD7tkb9qTZRFUDGaBQM+nz2-HDpAJJ8SSB+rxgctBfC3K9mHw@mail.gmail.com>
Subject: Re: [RFC PATCH v1 1/2] mm: vmscan: refactor updating reclaimed pages
 in reclaim_state
To:     Matthew Wilcox <willy@infradead.org>
Cc:     Alexander Viro <viro@zeniv.linux.org.uk>,
        "Darrick J. Wong" <djwong@kernel.org>,
        Christoph Lameter <cl@linux.com>,
        David Rientjes <rientjes@google.com>,
        Joonsoo Kim <iamjoonsoo.kim@lge.com>,
        Vlastimil Babka <vbabka@suse.cz>,
        Roman Gushchin <roman.gushchin@linux.dev>,
        Hyeonggon Yoo <42.hyeyoo@gmail.com>,
        Miaohe Lin <linmiaohe@huawei.com>,
        David Hildenbrand <david@redhat.com>,
        Johannes Weiner <hannes@cmpxchg.org>,
        Peter Xu <peterx@redhat.com>, NeilBrown <neilb@suse.de>,
        Shakeel Butt <shakeelb@google.com>,
        Michal Hocko <mhocko@kernel.org>,
        linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org,
        linux-xfs@vger.kernel.org, linux-mm@kvack.org
Content-Type: text/plain; charset="UTF-8"
Precedence: bulk

On Fri, Feb 3, 2023 at 8:22 AM Matthew Wilcox <willy@infradead.org> wrote:
>
> On Thu, Feb 02, 2023 at 11:32:28PM +0000, Yosry Ahmed wrote:
> > diff --git a/fs/xfs/xfs_buf.c b/fs/xfs/xfs_buf.c
> > index 54c774af6e1c..060079f1e966 100644
> > --- a/fs/xfs/xfs_buf.c
> > +++ b/fs/xfs/xfs_buf.c
> > @@ -286,8 +286,7 @@ xfs_buf_free_pages(
> >               if (bp->b_pages[i])
> >                       __free_page(bp->b_pages[i]);
> >       }
> > -     if (current->reclaim_state)
> > -             current->reclaim_state->reclaimed_slab += bp->b_page_count;
> > +     report_freed_pages(bp->b_page_count);
>
> XFS can be built as a module

I didn't know that, thanks for pointing it out!

>
> > +++ b/mm/vmscan.c
> > @@ -204,6 +204,19 @@ static void set_task_reclaim_state(struct task_struct *task,
> >       task->reclaim_state = rs;
> >  }
> >
> > +/*
> > + * reclaim_report_freed_pages: report pages freed outside of LRU-based reclaim
> > + * @pages: number of pages freed
> > + *
> > + * If the current process is undergoing a reclaim operation,
> > + * increment the number of reclaimed pages by @pages.
> > + */
> > +void report_freed_pages(unsigned long pages)
> > +{
> > +     if (current->reclaim_state)
> > +             current->reclaim_state->reclaimed += pages;
> > +}
> > +
>
> report_free_pages is not EXPORT_SYMBOLed

Will do that for the next version, thanks!