Re: Deadlock in NFSv4 in all kernels

[Zdenek Salvet]

On Tue, May 25, 2010 at 09:39:25AM -0400, Trond Myklebust wrote:
> The schemes I'm talking about typically had special memory pools
> preallocated for use by daemons, and would label the daemons using some
> equivalent of the PF_MEMALLOC flag to prevent recursion into the
> filesystem.

Yes. In my opinion, proper solution has to be careful at three points:
- daemons must be carefully written not to require much memory
- daemons should 'inherit' PF_MEMALLOC while processing upcalls 
- FS should try to flush fast enough (what W. Adamson wrote) and 
  delay new allocations when it cannot 

Regards,

Zdenek Salvet                                              salvet@xxxxxxxxxxx 
Institute of Computer Science of Masaryk University, Brno, Czech Republic
and CESNET, z.s.p.o., Prague, Czech Republic
Phone: ++420-549 49 6534                           Fax: ++420-541 212 747
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