Messages in this thread | | | Date | Sat, 31 Mar 2012 22:13:24 +0200 | From | Oleg Nesterov <> | Subject | Re: [PATCH 6/7] mm: kill vma flag VM_EXECUTABLE |
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On 03/31, Konstantin Khlebnikov wrote: > > comment from v2.6.25-6245-g925d1c4 ("procfs task exe symlink"), > where all this stuff was introduced: > > > ... > > This avoids pinning the mounted filesystem. > > So, this logic is hooked into every file mmap/unmmap and vma split/merge just to > fix some hypothetical pinning fs from umounting by mm which already unmapped all > its executable files, but still alive. Does anyone know any real world example?
This is the question to Matt.
> keep mm->exe_file alive till final mmput().
Please see the recent discussion, http://marc.info/?t=133096188900012
(just in case, the patch itself was deadly wrong, don't look at it ;)
> --- a/include/linux/mm_types.h > +++ b/include/linux/mm_types.h > @@ -378,7 +378,6 @@ struct mm_struct { > > /* store ref to file /proc/<pid>/exe symlink points to */ > struct file *exe_file; > - unsigned long num_exe_file_vmas;
Add Cyrill. This conflicts with c-r-prctl-add-ability-to-set-new-mm_struct-exe_file.patch in -mm.
Oleg.
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