Commits on Sep 26, 2019

1. Perform KABI checks in parallel …

   Reduce the time required for ./configure to perform the needed
   KABI checks by allowing kbuild to compile multiple test cases in
   parallel.  This was accomplished by splitting each test's source
   code from the logic handling whether that code could be compiled
   or not.
   
   By introducing this split it's possible to minimize the number of
   times kbuild needs to be invoked.  As importantly, it means all of
   the tests can be built in parallel.  This does require a little extra
   care since we expect some tests to fail, so the --keep-going (-k)
   option must be provided otherwise some tests may not get compiled.
   Furthermore, since a failure during the kbuild modpost phase will
   result in an early exit; the final linking phase is limited to tests
   which passed the initial compilation and produced an object file.
   
   Once everything has been built the configure script proceeds as
   previously.  The only significant difference is that it now merely
   needs to test for the existence of a .ko file to determine the
   result of a given test.  This vastly speeds up the entire process.
   
   New test cases should use ZFS_LINUX_TEST_SRC to declare their test
   source code and ZFS_LINUX_TEST_RESULT to check the result.  All of
   the existing kernel-*.m4 files have been updated accordingly, see
   config/kernel-current-time.m4 for a basic example.  The legacy
   ZFS_LINUX_TRY_COMPILE macro has been kept to handle special cases
   but it's use is not encouraged.
   
                     master (secs)   patched (secs)
                     -------------   ----------------
   autogen.sh        61              68
   configure         137             24  (~17% of current run time)
   make -j $(nproc)  44              44
   make rpms         287             150
   
   Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
   Issue openzfs#9132

   

   behlendorf committed Sep 26, 2019
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