On Sun, Sep 01, 2024 at 07:24:03PM +0200, Christophe Leroy wrote: > Without -O2, the generated code for testing chacha function is awful. > GCC even implements rol32() as a function instead of just using the > rotlwi instruction, that function is 20 instructions long. > > ~# time ./vdso_test_chacha > TAP version 13 > 1..1 > ok 1 chacha: PASS > real 0m 37.16s > user 0m 36.89s > sys 0m 0.26s > > Several other selftests directory add -O2, and the kernel is also > always built with optimisation active. Do the same for vDSO selftests. > > With this patch the time is reduced by approx 15%. > > ~# time ./vdso_test_chacha > TAP version 13 > 1..1 > ok 1 chacha: PASS > real 0m 32.09s > user 0m 31.86s > sys 0m 0.22s > Seems reasonable. I'll queue it up. Thanks. Jason
