arm64: clear_page: Add new implementation of clear_page() by STNP
hulk inclusion category: feature bugzilla: https://gitee.com/openeuler/kernel/issues/I3ZN72 CVE: NA --------------------------- Currently, clear_page() clear the page through 'dc zva', while the page may not be used immediately mostly, so the cache flush is in vain. Add an optimized implementation of clear_page() by 'stnp' for performance promotion. It can be switched by the boot cmdline 'mm.use_clearpage_stnp'. In the hugetlb clear test, we gained about 53.7% performance improvement: Set mm.use_clearpage_stnp = 0 | Set mm.use_clearpage_stnp = 1 [root@localhost liwei]# ./a.out 50 20 | [root@localhost liwei]# ./a.out 50 20 size is 50 Gib, test times is 20 | size is 50 Gib, test times is 20 test_time[0] : use 8.438046 sec | test_time[0] : use 3.722682 sec test_time[1] : use 8.028493 sec | test_time[1] : use 3.640274 sec test_time[2] : use 8.646547 sec | test_time[2] : use 4.095052 sec test_time[3] : use 8.122490 sec | test_time[3] : use 3.998446 sec test_time[4] : use 8.053038 sec | test_time[4] : use 4.084259 sec test_time[5] : use 8.843512 sec | test_time[5] : use 3.933871 sec test_time[6] : use 8.308906 sec | test_time[6] : use 3.934334 sec test_time[7] : use 8.093817 sec | test_time[7] : use 3.869142 sec test_time[8] : use 8.303504 sec | test_time[8] : use 3.902916 sec test_time[9] : use 8.178336 sec | test_time[9] : use 3.541885 sec test_time[10] : use 8.003625 sec | test_time[10] : use 3.595554 sec test_time[11] : use 8.163807 sec | test_time[11] : use 3.583813 sec test_time[12] : use 8.267464 sec | test_time[12] : use 3.863033 sec test_time[13] : use 8.055326 sec | test_time[13] : use 3.770953 sec test_time[14] : use 8.246986 sec | test_time[14] : use 3.808006 sec test_time[15] : use 8.546992 sec | test_time[15] : use 3.653194 sec test_time[16] : use 8.727256 sec | test_time[16] : use 3.722395 sec test_time[17] : use 8.288951 sec | test_time[17] : use 3.683508 sec test_time[18] : use 8.019322 sec | test_time[18] : use 4.253087 sec test_time[19] : use 8.250685 sec | test_time[19] : use 4.082845 sec hugetlb test end! | hugetlb test end! Signed-off-by:Wei Li <liwei391@huawei.com> Reviewed-by:
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