linux-kernel - Re: [PATCH 35/46] hugetlb: add MADV

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Message-ID: <CADrL8HUvugKN15=XBkELCa=rhd3vjRiwUDsY5cFKkWHO1x5Nyg@mail.gmail.com>
Date:   Tue, 10 Jan 2023 15:04:14 -0500
From:   James Houghton <jthoughton@...gle.com>
To:     Mike Kravetz <mike.kravetz@...cle.com>,
        Muchun Song <songmuchun@...edance.com>,
        Peter Xu <peterx@...hat.com>
Cc:     David Hildenbrand <david@...hat.com>,
        David Rientjes <rientjes@...gle.com>,
        Axel Rasmussen <axelrasmussen@...gle.com>,
        Mina Almasry <almasrymina@...gle.com>,
        "Zach O'Keefe" <zokeefe@...gle.com>,
        Manish Mishra <manish.mishra@...anix.com>,
        Naoya Horiguchi <naoya.horiguchi@....com>,
        "Dr . David Alan Gilbert" <dgilbert@...hat.com>,
        "Matthew Wilcox (Oracle)" <willy@...radead.org>,
        Vlastimil Babka <vbabka@...e.cz>,
        Baolin Wang <baolin.wang@...ux.alibaba.com>,
        Miaohe Lin <linmiaohe@...wei.com>,
        Yang Shi <shy828301@...il.com>,
        Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 35/46] hugetlb: add MADV_COLLAPSE for hugetlb

> +
> +               if (curr < end) {
> +                       /* Don't hold the VMA lock for too long. */
> +                       hugetlb_vma_unlock_write(vma);
> +                       cond_resched();
> +                       hugetlb_vma_lock_write(vma);

I need to drop/reacquire the mapping lock here too (missed this when I
added the bits to grab the mapping lock in this function).