linux-kernel - Re: [RFC PATCH 5/8] hugetlb: change free_pool_huge_page to remove_pool_huge

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Message-ID: <YFr7EbGx25KsYfVg@dhcp22.suse.cz>
Date:   Wed, 24 Mar 2021 09:40:49 +0100
From:   Michal Hocko <mhocko@...e.com>
To:     Mike Kravetz <mike.kravetz@...cle.com>
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        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>,
        Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [RFC PATCH 5/8] hugetlb: change free_pool_huge_page to
 remove_pool_huge_page

On Tue 23-03-21 18:03:07, Mike Kravetz wrote:
[...]
> Since you brought up cgroups ... what is your opinion on lock hold time
> in hugetlb_cgroup_css_offline?  We could potentially be calling
> hugetlb_cgroup_move_parent for every hugetlb page while holding the lock
> with interrupts disabled.

I am not familiar with hugetlb cgroup code TBH. But from a quick look
there is not much of heavy lifting there. If we find out that this is
really visible we can do the lock dance with cond_resched and retry with
the iteration again. Or is there any strong reason to process the list
in a single go?
-- 
Michal Hocko
SUSE Labs