linux-kernel - Re: [PATCH v6 3/3] mm: vmscan: refactor updating current->reclaim

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Date:   Fri, 14 Apr 2023 07:00:51 +1000
From:   Dave Chinner <david@...morbit.com>
To:     Yosry Ahmed <yosryahmed@...gle.com>
Cc:     David Hildenbrand <david@...hat.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        "Darrick J. Wong" <djwong@...nel.org>,
        Christoph Lameter <cl@...ux.com>,
        David Rientjes <rientjes@...gle.com>,
        Joonsoo Kim <iamjoonsoo.kim@....com>,
        Vlastimil Babka <vbabka@...e.cz>,
        Roman Gushchin <roman.gushchin@...ux.dev>,
        Hyeonggon Yoo <42.hyeyoo@...il.com>,
        "Matthew Wilcox (Oracle)" <willy@...radead.org>,
        Miaohe Lin <linmiaohe@...wei.com>,
        Johannes Weiner <hannes@...xchg.org>,
        Peter Xu <peterx@...hat.com>, NeilBrown <neilb@...e.de>,
        Shakeel Butt <shakeelb@...gle.com>,
        Michal Hocko <mhocko@...nel.org>, Yu Zhao <yuzhao@...gle.com>,
        Tim Chen <tim.c.chen@...ux.intel.com>,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-xfs@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH v6 3/3] mm: vmscan: refactor updating
 current->reclaim_state

On Thu, Apr 13, 2023 at 04:29:43AM -0700, Yosry Ahmed wrote:
> On Thu, Apr 13, 2023 at 4:21 AM David Hildenbrand <david@...hat.com> wrote:
> >
> > On 13.04.23 12:40, Yosry Ahmed wrote:
> > > During reclaim, we keep track of pages reclaimed from other means than
> > > LRU-based reclaim through scan_control->reclaim_state->reclaimed_slab,
> > > which we stash a pointer to in current task_struct.
> > >
> > > However, we keep track of more than just reclaimed slab pages through
> > > this. We also use it for clean file pages dropped through pruned inodes,
> > > and xfs buffer pages freed. Rename reclaimed_slab to reclaimed, and add
> >
> > Would "reclaimed_non_lru" be more expressive? Then,
> >
> > mm_account_reclaimed_pages() -> mm_account_non_lru_reclaimed_pages()
> >
> >
> > Apart from that LGTM.
> 
> Thanks!
> 
> I suck at naming things. If you think "reclaimed_non_lru" is better,
> then we can do that. FWIW mm_account_reclaimed_pages() was taken from
> a suggestion from Dave Chinner. My initial version had a terrible
> name: report_freed_pages(), so I am happy with whatever you see fit.
> 
> Should I re-spin for this or can we change it in place?

I don't care for the noise all the bikeshed painting has generated
for a simple change like this.  If it's a fix for a bug, and the
naming is good enough, just merge it already, ok?

-Dave.
-- 
Dave Chinner
david@...morbit.com