Messages in this thread | | | Date | Mon, 12 Aug 2019 16:38:29 -0400 | From | Johannes Weiner <> | Subject | Re: [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>
| |