linux-kernel - Re: [PATCH 1/8] mm: cma: introduce cma_release

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Message-ID: <YFxbrn7pHN4TIHkR@dhcp22.suse.cz>
Date:   Thu, 25 Mar 2021 10:45:18 +0100
From:   Michal Hocko <mhocko@...e.com>
To:     Mike Kravetz <mike.kravetz@...cle.com>
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        Roman Gushchin <guro@...com>,
        Shakeel Butt <shakeelb@...gle.com>,
        Oscar Salvador <osalvador@...e.de>,
        David Hildenbrand <david@...hat.com>,
        Muchun Song <songmuchun@...edance.com>,
        David Rientjes <rientjes@...gle.com>,
        Miaohe Lin <linmiaohe@...wei.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Matthew Wilcox <willy@...radead.org>,
        HORIGUCHI NAOYA <naoya.horiguchi@....com>,
        "Aneesh Kumar K . V" <aneesh.kumar@...ux.ibm.com>,
        Waiman Long <longman@...hat.com>, Peter Xu <peterx@...hat.com>,
        Mina Almasry <almasrymina@...gle.com>,
        Hillf Danton <hdanton@...a.com>,
        Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH 1/8] mm: cma: introduce cma_release_nowait()

On Wed 24-03-21 17:28:28, Mike Kravetz wrote:
[...]
>  phys_addr_t cma_get_base(const struct cma *cma)
>  {
>  	return PFN_PHYS(cma->base_pfn);
> @@ -146,6 +155,10 @@ static int __init cma_init_reserved_areas(void)
>  	for (i = 0; i < cma_area_count; i++)
>  		cma_activate_area(&cma_areas[i]);
>  
> +	cma_release_wq = create_workqueue("cma_release");

Considering the workqueue is used to free up memory it should likely be
WQ_MEM_RECLAIM to prevent from long stalls when WQs are overloaded.

I cannot judge the CMA parts from a very quick glance this looks
reasonably.
-- 
Michal Hocko
SUSE Labs