• John Hubbard's avatar
    mm/gup_benchmark: rename to mm/gup_test · 9c84f229
    John Hubbard authored
    Patch series "selftests/vm: gup_test, hmm-tests, assorted improvements", v3.
    
    Summary: This series provides two main things, and a number of smaller
    supporting goodies.  The two main points are:
    
    1) Add a new sub-test to gup_test, which in turn is a renamed version
       of gup_benchmark.  This sub-test allows nicer testing of dump_pages(),
       at least on user-space pages.
    
       For quite a while, I was doing a quick hack to gup_test.c whenever I
       wanted to try out changes to dump_page().  Then Matthew Wilcox asked me
       what I meant when I said "I used my dump_page() unit test", and I
       realized that it might be nice to check in a polished up version of
       that.
    
       Details about how it works and how to use it are in the commit
       description for patch #6 ("selftests/vm: gup_test: introduce the
       dump_pages() sub-test").
    
    2) Fixes a limitation of hmm-tests: these tests are incredibly useful,
       but only if people actually build and run them.  And it turns out that
       libhugetlbfs is a little too effective at throwing a wrench in the
       works, there.  So I've added a little configuration check that removes
       just two of the 21 hmm-tests, if libhugetlbfs is not available.
    
       Further details in the commit description of patch #8
       ("selftests/vm: hmm-tests: remove the libhugetlbfs dependency").
    
    Other smaller things that this series does:
    
    a) Remove code duplication by creating gup_test.h.
    
    b) Clear up the sub-test organization, and their invocation within
       run_vmtests.sh.
    
    c) Other minor assorted improvements.
    
    [1] v2 is here:
    https://lore.kernel.org/linux-doc/20200929212747.251804-1-jhubbard@nvidia.com/
    
    [2] https://lore.kernel.org/r/CAHk-=wgh-TMPHLY3jueHX7Y2fWh3D+nMBqVS__AZm6-oorquWA@mail.gmail.com
    
    This patch (of 9):
    
    Rename nearly every "gup_benchmark" reference and file name to "gup_test".
    The one exception is for the actual gup benchmark test itself.
    
    The current code already does a *little* bit more than benchmarking, and
    definitely covers more than get_user_pages_fast().  More importantly,
    however, subsequent patches are about to add some functionality that is
    non-benchmark related.
    
    Closely related changes:
    
    * Kconfig: in addition to renaming the options from GUP_BENCHMARK to
      GUP_TEST, update the help text to reflect that it's no longer a
      benchmark-only test.
    
    Link: https://lkml.kernel.org/r/20201026064021.3545418-1-jhubbard@nvidia.com
    Link: https://lkml.kernel.org/r/20201026064021.3545418-2-jhubbard@nvidia.comSigned-off-by: default avatarJohn Hubbard <jhubbard@nvidia.com>
    Cc: Jonathan Corbet <corbet@lwn.net>
    Cc: Jérôme Glisse <jglisse@redhat.com>
    Cc: Ralph Campbell <rcampbell@nvidia.com>
    Cc: Shuah Khan <shuah@kernel.org>
    Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
    Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
    9c84f229
Kconfig 27.8 KB