linux-kernel - Re: [PATCH v2 1/2] mm, thp: check page mapping when truncating page cache

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Date:   Mon, 4 Oct 2021 13:26:26 -0700
From:   Song Liu <song@...nel.org>
To:     Rongwei Wang <rongwei.wang@...ux.alibaba.com>
Cc:     Matthew Wilcox <willy@...radead.org>,
        Hugh Dickins <hughd@...gle.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linux MM <linux-mm@...ck.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        William Kucharski <william.kucharski@...cle.com>
Subject: Re: [PATCH v2 1/2] mm, thp: check page mapping when truncating page cache

On Mon, Oct 4, 2021 at 10:26 AM Rongwei Wang
<rongwei.wang@...ux.alibaba.com> wrote:
>
> Hi,
> I have run our cases these two days to stress test new Patch #1. The new
> Patch #1 mainly add filemap_invalidate_{un}lock before and after
> truncate_pagecache(), basing on original Patch #1. And the crash has not
> happened.
>
> Now, I keep the original Patch #1, then adding the code below which
> suggested by liu song (I'm not sure which one I should add in the next
> version, Suggested-by or Signed-off-by? If you know, please remind me).
>
> -               if (filemap_nr_thps(inode->i_mapping))
> +               if (filemap_nr_thps(inode->i_mapping)) {
> +                       filemap_invalidate_lock(inode->i_mapping);
>                          truncate_pagecache(inode, 0);
> +                       filemap_invalidate_unlock(inode->i_mapping);
> +               }

It is mostly suggested by Matthew. If the patch goes that way, you can add

Tested-by: Song Liu <song@...nel.org>