Re: [PATCH v9 6/6] mm,thp: avoid writes to file with THP in pagecache

From: Rik van Riel
Date: Thu Jun 27 2019 - 09:18:43 EST

On Mon, 2019-06-24 at 17:12 -0700, Song Liu wrote:
> In previous patch, an application could put part of its text section
> in
> THP via madvise(). These THPs will be protected from writes when the
> application is still running (TXTBSY). However, after the application
> exits, the file is available for writes.
> This patch avoids writes to file THP by dropping page cache for the
> file
> when the file is open for write. A new counter nr_thps is added to
> struct
> address_space. In do_last(), if the file is open for write and
> nr_thps
> is non-zero, we drop page cache for the whole file.
> Reported-by: kbuild test robot <lkp@xxxxxxxxx>
> Signed-off-by: Song Liu <songliubraving@xxxxxx>

Acked-by: Rik van Riel <riel@xxxxxxxxxxx>

All Rights Reversed.

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