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Shutemov" To: Vlastimil Babka Cc: Michal Hocko , kirill.shutemov@linux.intel.com, Yang Shi , hannes@cmpxchg.org, rientjes@google.com, akpm@linux-foundation.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: Re: [v2 PATCH -mm] mm: account deferred split THPs into MemAvailable Message-ID: <20190822154914.gb5clks2tzziobfx@box> References: <1566410125-66011-1-git-send-email-yang.shi@linux.alibaba.com> <20190822080434.GF12785@dhcp22.suse.cz> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: NeoMutt/20180716 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 Thu, Aug 22, 2019 at 02:56:56PM +0200, Vlastimil Babka wrote: > >> @@ -2816,11 +2821,14 @@ void free_transhuge_page(struct page *page) > >> ds_queue->split_queue_len--; > >> list_del(page_deferred_list(page)); > >> } > >> + __mod_node_page_state(page_pgdat(page), NR_KERNEL_MISC_RECLAIMABLE, > >> + -page[2].nr_freeable); > >> + page[2].nr_freeable = 0; > > Wouldn't it be safer to fully tie the nr_freeable use to adding the page to the > deffered list? So here the code would be in the if (!list_empty()) { } part above. > > >> spin_unlock_irqrestore(&ds_queue->split_queue_lock, flags); > >> free_compound_page(page); > >> } > >> > >> -void deferred_split_huge_page(struct page *page) > >> +void deferred_split_huge_page(struct page *page, unsigned int nr) > >> { > >> struct deferred_split *ds_queue = get_deferred_split_queue(page); > >> #ifdef CONFIG_MEMCG > >> @@ -2844,6 +2852,9 @@ void deferred_split_huge_page(struct page *page) > >> return; > >> > >> spin_lock_irqsave(&ds_queue->split_queue_lock, flags); > >> + page[2].nr_freeable += nr; > >> + __mod_node_page_state(page_pgdat(page), NR_KERNEL_MISC_RECLAIMABLE, > >> + nr); > > Same here, only do this when adding to the list, below? Or we might perhaps > account base pages multiple times? No, it cannot be under list_empty() check. Consider the case when a THP got unmapped 4k a time. You need to put it on the list once, but account it every time. -- Kirill A. Shutemov