About user defined PC

[jiaxun hou]

Hi,
   
  I met a problem ,when I constructed a user-defined PC. That is I need to defind the process of  P^(-1)Mx in each iteration of GMRES by myself for efficient reason, not only define P^(-1)x . But the Petsc seems to  separate  this process into two parts: the first is y=Mx which is defined in Petsc framework, and the second is P^(-1)y which is defined  by the user. So, is there any way to do it without change the code of Petsc framework?
   
  Regards,
  Jiaxun

 		
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