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Date:   Fri, 11 Dec 2020 16:23:54 -0400
From:   Jason Gunthorpe <jgg@ziepe.ca>
To:     Pavel Tatashin <pasha.tatashin@soleen.com>
Cc:     linux-kernel@vger.kernel.org, linux-mm@kvack.org,
        akpm@linux-foundation.org, vbabka@suse.cz, mhocko@suse.com,
        david@redhat.com, osalvador@suse.de, dan.j.williams@intel.com,
        sashal@kernel.org, tyhicks@linux.microsoft.com,
        iamjoonsoo.kim@lge.com, mike.kravetz@oracle.com,
        rostedt@goodmis.org, mingo@redhat.com, peterz@infradead.org,
        mgorman@suse.de, willy@infradead.org, rientjes@google.com,
        jhubbard@nvidia.com, linux-doc@vger.kernel.org
Subject: Re: [PATCH v3 5/6] mm/gup: migrate pinned pages out of movable zone
Message-ID: <20201211202354.GA2225686@ziepe.ca>
References: <20201211202140.396852-1-pasha.tatashin@soleen.com>
 <20201211202140.396852-6-pasha.tatashin@soleen.com>
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On Fri, Dec 11, 2020 at 03:21:39PM -0500, Pavel Tatashin wrote:
> @@ -1593,7 +1592,7 @@ static long check_and_migrate_cma_pages(struct mm_struct *mm,
>  				}
>  
>  				if (!isolate_lru_page(head)) {
> -					list_add_tail(&head->lru, &cma_page_list);
> +					list_add_tail(&head->lru, &movable_page_list);
>  					mod_node_page_state(page_pgdat(head),
>  							    NR_ISOLATED_ANON +
>  							    page_is_file_lru(head),
> @@ -1605,7 +1604,7 @@ static long check_and_migrate_cma_pages(struct mm_struct *mm,
>  		i += step;
>  	}
>  
> -	if (!list_empty(&cma_page_list)) {
> +	if (!list_empty(&movable_page_list)) {

You didn't answer my earlier question, is it OK that ZONE_MOVABLE
pages leak out here if ioslate_lru_page() fails but the
moval_page_list is empty? 

I think the answer is no, right?

Jason