[Bug tapsets/19876] New: userfaultfd missing from syscall tapset

["dsmith at redhat dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=19876

            Bug ID: 19876
           Summary: userfaultfd missing from syscall tapset
           Product: systemtap
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: tapsets
          Assignee: systemtap at sourceware dot org
          Reporter: dsmith at redhat dot com
  Target Milestone: ---

The userfaultfd syscall was added in kernel 4.3 by the following kernel commit:

====
commit 86039bd3b4e6a1129318cbfed4e0a6e001656635                                 
Author: Andrea Arcangeli <aarcange@redhat.com>                                  
Date:   Fri Sep 4 15:46:31 2015 -0700                                           

    userfaultfd: add new syscall to provide memory externalization              

    Once an userfaultfd has been created and certain region of the process      
    virtual address space have been registered into it, the thread responsible  
    for doing the memory externalization can manage the page faults in          
    userland by talking to the kernel using the userfaultfd protocol.           

    poll() can be used to know when there are new pending userfaults to be      
    read (POLLIN).                                                              
====

Support for userfaultfd() should be added to the syscall tapset.

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