On Tue, Feb 04, 2020 at 03:41:16PM -0800, John Hubbard wrote: > Up until now, gup_benchmark supported testing of the > following kernel functions: > > * get_user_pages(): via the '-U' command line option > * get_user_pages_longterm(): via the '-L' command line option > * get_user_pages_fast(): as the default (no options required) > > Add test coverage for the new corresponding pin_*() functions: > > * pin_user_pages_fast(): via the '-a' command line option > * pin_user_pages(): via the '-b' command line option > > Also, add an option for clarity: '-u' for what is now (still) the > default choice: get_user_pages_fast(). > > Also, for the commands that set FOLL_PIN, verify that the pages > really are dma-pinned, via the new is_dma_pinned() routine. > Those commands are: > > PIN_FAST_BENCHMARK : calls pin_user_pages_fast() > PIN_BENCHMARK : calls pin_user_pages() > > In between the calls to pin_*() and unpin_user_pages(), > check each page: if page_maybe_dma_pinned() returns false, then > WARN and return. > > Do this outside of the benchmark timestamps, so that it doesn't > affect reported times. > > Reviewed-by: Ira Weiny <ira.weiny@xxxxxxxxx> > Signed-off-by: John Hubbard <jhubbard@xxxxxxxxxx> Acked-by: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx> -- Kirill A. Shutemov
