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Shutemov" To: Alex Shi Cc: cgroups@vger.kernel.org, akpm@linux-foundation.org, mgorman@techsingularity.net, tj@kernel.org, hughd@google.com, khlebnikov@yandex-team.ru, daniel.m.jordan@oracle.com, yang.shi@linux.alibaba.com, willy@infradead.org, hannes@cmpxchg.org, lkp@intel.com, Andrea Arcangeli , linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH v9 06/20] mm/thp: narrow lru locking Message-ID: <20200304080248.wuj3vqlz46ehhptg@box> References: <1583146830-169516-1-git-send-email-alex.shi@linux.alibaba.com> <1583146830-169516-7-git-send-email-alex.shi@linux.alibaba.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1583146830-169516-7-git-send-email-alex.shi@linux.alibaba.com> 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 Mon, Mar 02, 2020 at 07:00:16PM +0800, Alex Shi wrote: > @@ -2564,6 +2565,9 @@ static void __split_huge_page(struct page *page, struct list_head *list, > xa_lock(&swap_cache->i_pages); > } > > + /* Lru list would be changed, don't care head's LRU bit. */ > + spin_lock_irqsave(&pgdat->lru_lock, flags); > + > for (i = HPAGE_PMD_NR - 1; i >= 1; i--) { > __split_huge_page_tail(head, i, lruvec, list); > /* Some pages can be beyond i_size: drop them from page cache */ You change locking order WRT i_pages lock. Is it safe? -- Kirill A. Shutemov