lkml.org 
[lkml]   [2019]   [Aug]   [12]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH v10 7/7] mm,thp: avoid writes to file with THP in pagecache
On Thu, Aug 01, 2019 at 11:42:44AM -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_dentry_open(), if the file is open for write and
> nr_thps is non-zero, we drop page cache for the whole file.
>
> Cc: Johannes Weiner <hannes@cmpxchg.org>
> Reported-by: kbuild test robot <lkp@intel.com>
> Acked-by: Rik van Riel <riel@surriel.com>
> Acked-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
> Signed-off-by: Song Liu <songliubraving@fb.com>

Acked-by: Johannes Weiner <hannes@cmpxchg.org>

\
 
 \ /
  Last update: 2019-08-12 22:39    [W:0.059 / U:0.180 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site