• Yury Norov's avatar
    lib/find_bit_benchmark.c: improvements · 15ff67bf
    Yury Norov authored
    As suggested in review comments:
    * printk: align numbers using whitespaces instead of tabs;
    * return error value from init() to avoid calling rmmod if testing again;
    * use ktime_get instead of get_cycles as some arches don't support it;
    
    The output in dmesg (on QEMU arm64):
    [   38.823430] Start testing find_bit() with random-filled bitmap
    [   38.845358] find_next_bit:                20138448 ns, 163968 iterations
    [   38.856217] find_next_zero_bit:           10615328 ns, 163713 iterations
    [   38.863564] find_last_bit:                 7111888 ns, 163967 iterations
    [   40.944796] find_first_bit:             2081007216 ns, 163968 iterations
    [   40.944975]
    [   40.944975] Start testing find_bit() with sparse bitmap
    [   40.945268] find_next_bit:                   73216 ns,    656 iterations
    [   40.967858] find_next_zero_bit:           22461008 ns, 327025 iterations
    [   40.968047] find_last_bit:                   62320 ns,    656 iterations
    [   40.978060] find_first_bit:                9889360 ns,    656 iterations
    
    Link: http://lkml.kernel.org/r/20171124143040.a44jvhmnaiyedg2i@yury-thinkpadSigned-off-by: default avatarYury Norov <ynorov@caviumnetworks.com>
    Tested-by: default avatarGeert Uytterhoeven <geert@linux-m68k.org>
    Cc: Alexey Dobriyan <adobriyan@gmail.com>
    Cc: Clement Courbet <courbet@google.com>
    Cc: Matthew Wilcox <mawilcox@microsoft.com>
    Cc: Rasmus Villemoes <linux@rasmusvillemoes.dk>
    Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
    Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
    15ff67bf
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