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Linux x86_64; rv:91.0) Gecko/20100101 Thunderbird/91.10.0 Subject: Re: [PATCH 7/7] mm/page_alloc: Replace local_lock with normal spinlock Content-Language: en-US To: Yu Zhao , Andrew Morton Cc: Marek Szyprowski , Mel Gorman , Nicolas Saenz Julienne , Marcelo Tosatti , Michal Hocko , Hugh Dickins , LKML , Linux-MM References: <20220613125622.18628-1-mgorman@techsingularity.net> <20220613125622.18628-8-mgorman@techsingularity.net> <20220615160446.be1f75fd256d67e57b27a9fc@linux-foundation.org> From: Vlastimil Babka In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit ARC-Authentication-Results: i=1; imf22.hostedemail.com; dkim=pass header.d=suse.cz header.s=susede2_rsa header.b=YhAaqPEm; dkim=pass header.d=suse.cz header.s=susede2_ed25519 header.b="9vX/bCMn"; dmarc=none; spf=pass (imf22.hostedemail.com: domain of vbabka@suse.cz designates 195.135.220.29 as permitted sender) smtp.mailfrom=vbabka@suse.cz ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; 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dmarc=none; spf=pass (imf22.hostedemail.com: domain of vbabka@suse.cz designates 195.135.220.29 as permitted sender) smtp.mailfrom=vbabka@suse.cz X-Stat-Signature: 9jegq3hspnu4bsshbp5kr1ag3j7h613i X-HE-Tag: 1655452539-271488 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 6/16/22 05:05, Yu Zhao wrote: > On Wed, Jun 15, 2022 at 04:04:46PM -0700, Andrew Morton wrote: > > While we are at it, please consider this cleanup: I suspect Mel had further plans for the API beynd this series. ... > #define pcp_spin_trylock_irqsave(ptr, flags) \ > - pcpu_spin_trylock_irqsave(struct per_cpu_pages, lock, ptr, flags) > - > -#define pcp_spin_unlock(ptr) \ > - pcpu_spin_unlock(lock, ptr) > +({ \ > + struct per_cpu_pages *_ret; \ > + pcpu_task_pin(); \ > + _ret = this_cpu_ptr(ptr); \ > + if (!spin_trylock_irqsave(&_ret->lock, flags)) \ Also missing the unpin? > + _ret = NULL; \ > + _ret; \ > +}) > > #define pcp_spin_unlock_irqrestore(ptr, flags) \ > - pcpu_spin_unlock_irqrestore(lock, ptr, flags) > +({ \ > + spin_unlock_irqrestore(&ptr->lock, flags); \ > + pcpu_task_unpin(); \ > +}) > + > #ifdef CONFIG_USE_PERCPU_NUMA_NODE_ID > DEFINE_PER_CPU(int, numa_node); > EXPORT_PER_CPU_SYMBOL(numa_node); > @@ -3488,7 +3458,7 @@ void free_unref_page(struct page *page, unsigned int order) > > zone = page_zone(page); > pcp_trylock_prepare(UP_flags); > - pcp = pcpu_spin_trylock_irqsave(struct per_cpu_pages, lock, zone->per_cpu_pageset, flags); > + pcp = pcp_spin_trylock_irqsave(zone->per_cpu_pageset, flags); > if (pcp) { > free_unref_page_commit(pcp, zone, page, migratetype, order); > pcp_spin_unlock_irqrestore(pcp, flags);