[lkml]   [2010]   [Apr]   [7]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: [PATCH -v2] rmap: make anon_vma_prepare link in all the anon_vmas of a mergeable VMA

Wow, your patch is very cool. I'm surprising such 20 lines patch makes
lots simplify.

> On Wed, 7 Apr 2010, Linus Torvalds wrote:
> >
> > Yes. The failure point is too late to do anything really interesting with,
> > and the old code also just causes a SIGBUS. My intention was to change the
> >
> > WARN_ONCE(!vma->anon_vma);
> >
> > into returning that SIGBUS - which is not wonderful, but is no different
> > from old failures.
> Not SIGBUS, but VM_FAULT_OOM, of course.

Now pagefault don't insert anon_vma anymore, right? if so, SIGBUS is better.
Now SIGBUS and VM_FAULT_OOM make different result.

SIGBUS -> kill current task
VM_FAULT_OOM -> invoke oom-killer (see pagefault_out_of_memory())

If current task can't recover proper anon_vma. we should just kill current
instead random highest badness process. otherwise !anon_vma process continue
to randomly invoke oom-killer.

Perhaps, I'm missing something.

 \ /
  Last update: 2010-04-08 04:05    [W:0.206 / U:3.460 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site