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Thu, 13 Aug 2020 00:34:12 -0700 (PDT) Date: Thu, 13 Aug 2020 01:34:08 -0600 From: Yu Zhao To: Yang Shi Cc: Andrew Morton , Alexander Duyck , Huang Ying , David Hildenbrand , Michal Hocko , Yang Shi , Qian Cai , Mel Gorman , Nicholas Piggin , =?iso-8859-1?B?Suly9G1l?= Glisse , Hugh Dickins , Linux MM , Linux Kernel Mailing List , Joonsoo Kim Subject: Re: [PATCH 1/3] mm: don't call activate_page() on new ksm pages Message-ID: <20200813073408.GA3996183@google.com> References: <20200812040423.2707213-1-yuzhao@google.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-Rspamd-Queue-Id: C74B41AD1B5 X-Spamd-Result: default: False [0.00 / 100.00] X-Rspamd-Server: rspam01 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Wed, Aug 12, 2020 at 10:19:24PM -0700, Yang Shi wrote: > On Tue, Aug 11, 2020 at 9:04 PM Yu Zhao wrote: > > > > lru_cache_add_active_or_unevictable() already adds new ksm pages to > > active lru. Calling activate_page() isn't really necessary in this > > case. > > > > Signed-off-by: Yu Zhao > > --- > > mm/swapfile.c | 10 +++++----- > > 1 file changed, 5 insertions(+), 5 deletions(-) > > > > diff --git a/mm/swapfile.c b/mm/swapfile.c > > index 6c26916e95fd..cf115ea26a20 100644 > > --- a/mm/swapfile.c > > +++ b/mm/swapfile.c > > @@ -1913,16 +1913,16 @@ static int unuse_pte(struct vm_area_struct *vma, pmd_t *pmd, > > pte_mkold(mk_pte(page, vma->vm_page_prot))); > > if (page == swapcache) { > > page_add_anon_rmap(page, vma, addr, false); > > + /* > > + * Move the page to the active list so it is not > > + * immediately swapped out again after swapon. > > + */ > > + activate_page(page); > > Actually I think we could just remove this activate_page() call with > Joonsoo's anonymous page workingset series merged. The active bit will > be taken care by workingset_refault(). > > > } else { /* ksm created a completely new copy */ > > page_add_new_anon_rmap(page, vma, addr, false); > > lru_cache_add_active_or_unevictable(page, vma); > > And it looks the latest linus's tree already changed this to > lru_cache_add_inactive_or_unevictable() by commit b518154e59 > ("mm/vmscan: protect the workingset on anonymous LRU") Oops, apparently my tree is out of date. I'll work on a new version that removes the superfluous activate_page(). Meanwhile, can you please take a look at the rest of this series and let me know if there is anything else that we might want to change? Thank you.