On 03/20/2018 04:54 AM, Aaron Lu wrote:
This series is meant to improve zone->lock scalability for order 0 pages. With will-it-scale/page_fault1 workload, on a 2 sockets Intel Skylake server with 112 CPUs, CPU spend 80% of its time spinning on zone->lock. Perf profile shows the most time consuming part under zone->lock is the cache miss on "struct page", so here I'm trying to avoid those cache misses.
I ran page_fault1 comparing 4.16-rc5 to your recent work, these four patches plus the three others from your github branch zone_lock_rfc_v2. Out of curiosity I also threw in another 4.16-rc5 with the pcp batch size adjusted so high (10922 pages) that we always stay in the pcp lists and out of buddy completely. I used your patch[*] in this last kernel.
This was on a 2-socket, 20-core broadwell server.There were some small regressions a bit outside the noise at low process counts (2-5) but I'm not sure they're repeatable. Anyway, it does improve the microbenchmark across the board.
[*] lkml.kernel.org/r/20170919072342.GB7263 () intel ! com
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kernel (#) ntask proc thr proc stdev thr stdev
speedup speedup pgf/s pgf/s
4.16-rc5 (1) 1 586,305 747 587,731 1,766
lu-zone (2) 1 4.0% 3.4% 609,505 1,562 608,007 1,169
4.16-rc5-nz (3) 1 8.0% 5.9% 633,145 1,752 622,690 1,286
4.16-rc5 (1) 2 1,131,428 7,396 1,022,890 7,333
lu-zone (2) 2 -1.0% -0.3% 1,119,974 2,557 1,020,102 5,706
4.16-rc5-nz (3) 2 3.0% 3.3% 1,165,004 6,232 1,056,689 6,411
4.16-rc5 (1) 3 1,590,413 6,411 1,346,900 8,924
lu-zone (2) 3 -0.7% 1.0% 1,579,816 7,216 1,360,376 4,418
4.16-rc5-nz (3) 3 2.3% 3.4% 1,626,925 5,321 1,392,515 8,180
4.16-rc5 (1) 4 2,064,476 5,034 1,656,475 14,713
lu-zone (2) 4 -1.0% 0.9% 2,043,240 9,069 1,672,036 5,342
4.16-rc5-nz (3) 4 1.2% 3.9% 2,089,959 8,287 1,721,614 7,796
4.16-rc5 (1) 5 2,486,090 11,178 1,878,085 15,286
lu-zone (2) 5 -0.1% 1.1% 2,483,021 15,100 1,898,459 9,295
4.16-rc5-nz (3) 5 1.3% 4.0% 2,517,602 13,717 1,952,995 7,481
4.16-rc5 (1) 6 2,869,756 9,194 2,058,398 20,580
lu-zone (2) 6 0.4% 3.5% 2,882,220 20,583 2,129,444 9,689
4.16-rc5-nz (3) 6 2.4% 6.0% 2,937,618 14,126 2,182,859 9,650
4.16-rc5 (1) 7 3,242,589 15,354 2,231,977 20,188
lu-zone (2) 7 0.9% 3.2% 3,270,796 15,124 2,303,780 6,607
4.16-rc5-nz (3) 7 2.0% 6.7% 3,306,528 17,683 2,381,279 16,507
4.16-rc5 (1) 8 3,598,209 10,764 2,361,819 13,508
lu-zone (2) 8 1.2% 4.5% 3,642,407 14,893 2,469,191 16,250
4.16-rc5-nz (3) 8 2.0% 8.1% 3,671,834 17,501 2,552,786 12,112
4.16-rc5 (1) 9 3,974,345 12,605 2,511,565 31,986
lu-zone (2) 9 2.3% 4.8% 4,067,553 11,069 2,632,608 8,158
4.16-rc5-nz (3) 9 2.5% 9.8% 4,073,111 12,463 2,758,075 31,432
4.16-rc5 (1) 10 4,333,026 12,187 2,636,914 15,064
lu-zone (2) 10 2.4% 5.8% 4,435,852 21,691 2,789,949 16,399
4.16-rc5-nz (3) 10 3.2% 10.3% 4,470,666 23,663 2,907,263 15,052
4.16-rc5 (1) 11 4,932,423 12,183 2,675,769 23,924
lu-zone (2) 11 2.7% 3.6% 5,064,666 18,600 2,771,476 22,438
4.16-rc5-nz (3) 11 3.6% 7.9% 5,110,434 21,459 2,888,419 18,180
4.16-rc5 (1) 12 5,461,255 14,704 2,631,232 24,390
lu-zone (2) 12 1.7% 2.5% 5,554,957 20,978 2,697,554 19,369
4.16-rc5-nz (3) 12 3.1% 5.8% 5,629,143 22,781 2,782,902 20,346
4.16-rc5 (1) 13 5,924,367 11,835 2,445,607 25,821
lu-zone (2) 13 1.4% 4.9% 6,004,723 19,070 2,566,547 26,031
4.16-rc5-nz (3) 13 2.9% 8.4% 6,094,087 17,676 2,651,793 20,050
4.16-rc5 (1) 14 6,381,611 16,791 2,277,611 39,557
lu-zone (2) 14 1.2% 4.4% 6,459,693 18,869 2,377,795 25,093
4.16-rc5-nz (3) 14 2.4% 12.4% 6,534,837 24,990 2,560,085 12,638
4.16-rc5 (1) 15 6,804,737 13,653 2,232,121 19,408
lu-zone (2) 15 1.1% 4.8% 6,881,730 18,995 2,338,868 18,922
4.16-rc5-nz (3) 15 2.4% 12.5% 6,970,318 28,677 2,510,594 25,890
4.16-rc5 (1) 16 7,197,145 17,499 2,313,168 16,694
lu-zone (2) 16 1.2% 4.5% 7,287,072 28,727 2,418,232 23,120
4.16-rc5-nz (3) 16 2.6% 7.6% 7,383,613 17,991 2,489,382 28,385
4.16-rc5 (1) 17 7,550,498 15,101 2,226,427 24,768
lu-zone (2) 17 1.6% 4.4% 7,667,641 24,305 2,324,675 16,265
4.16-rc5-nz (3) 17 2.8% 5.3% 7,761,917 29,854 2,345,195 20,659
4.16-rc5 (1) 18 7,902,794 12,578 2,188,399 37,453
lu-zone (2) 18 1.7% 6.0% 8,033,876 21,158 2,320,641 13,053
4.16-rc5-nz (3) 18 2.8% 8.9% 8,126,732 27,619 2,383,083 25,172
4.16-rc5 (1) 19 8,277,506 15,448 2,198,021 33,074
lu-zone (2) 19 2.1% 6.4% 8,453,255 17,411 2,339,395 20,220
4.16-rc5-nz (3) 19 3.0% 7.7% 8,529,130 29,852 2,366,800 20,139
4.16-rc5 (1) 20 8,651,034 19,705 2,239,626 25,694
lu-zone (2) 20 2.2% 3.2% 8,840,988 24,387 2,311,966 25,693
4.16-rc5-nz (3) 20 3.1% 9.3% 8,918,721 34,761 2,448,589 26,227
4.16-rc5 (1) 21 8,777,023 11,833 2,259,622 32,154
lu-zone (2) 21 2.5% 5.7% 8,993,348 25,480 2,389,000 29,464
4.16-rc5-nz (3) 21 3.5% 6.3% 9,085,319 27,790 2,401,713 28,706
4.16-rc5 (1) 22 8,855,202 27,455 2,268,030 35,914
lu-zone (2) 22 3.0% 4.1% 9,123,705 34,288 2,361,876 31,917
4.16-rc5-nz (3) 22 4.2% 11.9% 9,228,843 33,483 2,536,867 26,000
4.16-rc5 (1) 23 8,952,897 21,601 2,280,539 30,530
lu-zone (2) 23 3.5% 10.1% 9,268,365 30,803 2,510,883 26,312
4.16-rc5-nz (3) 23 4.6% 10.3% 9,367,048 30,681 2,514,740 32,896
4.16-rc5 (1) 24 9,036,582 19,482 2,374,728 42,891
lu-zone (2) 24 3.7% 2.2% 9,369,541 33,253 2,425,993 45,952
4.16-rc5-nz (3) 24 5.0% 4.5% 9,489,640 28,066 2,482,179 33,820
4.16-rc5 (1) 25 9,136,041 18,232 2,336,090 30,036
lu-zone (2) 25 4.0% 6.1% 9,497,501 34,408 2,478,602 31,959
4.16-rc5-nz (3) 25 4.7% 10.5% 9,563,832 34,506 2,581,056 38,516
4.16-rc5 (1) 26 9,226,630 17,998 2,326,070 33,782
lu-zone (2) 26 3.7% 7.8% 9,570,547 27,052 2,508,396 41,848
4.16-rc5-nz (3) 26 4.4% 10.4% 9,634,192 40,217 2,566,842 31,115
4.16-rc5 (1) 27 9,305,784 24,573 2,391,261 29,547
lu-zone (2) 27 3.8% 6.1% 9,656,252 39,164 2,536,624 45,738
4.16-rc5-nz (3) 27 4.5% 5.2% 9,720,210 31,171 2,516,447 32,347
4.16-rc5 (1) 28 9,381,004 19,377 2,442,774 35,745
lu-zone (2) 28 2.6% 1.3% 9,626,125 65,187 2,474,560 29,977
4.16-rc5-nz (3) 28 4.1% 4.4% 9,766,045 54,298 2,549,227 31,199
4.16-rc5 (1) 29 9,401,844 27,746 2,456,372 40,549
lu-zone (2) 29 2.7% 3.8% 9,652,161 51,629 2,549,004 39,990
4.16-rc5-nz (3) 29 3.5% 6.9% 9,731,681 51,852 2,625,589 27,821
4.16-rc5 (1) 30 9,428,320 17,561 2,509,119 39,752
lu-zone (2) 30 2.1% 6.1% 9,630,472 50,106 2,662,447 44,347
4.16-rc5-nz (3) 30 3.1% 5.7% 9,722,152 50,348 2,651,891 28,518
4.16-rc5 (1) 31 9,561,062 21,909 2,392,883 24,180
lu-zone (2) 31 2.0% 7.1% 9,755,774 60,381 2,563,573 32,132
4.16-rc5-nz (3) 31 3.5% 15.0% 9,894,735 45,966 2,752,506 28,516
4.16-rc5 (1) 32 9,624,859 30,462 2,480,667 27,055
lu-zone (2) 32 2.7% 5.5% 9,883,943 61,850 2,618,326 36,655
4.16-rc5-nz (3) 32 4.5% 15.4% 10,057,320 46,352 2,863,788 34,021
4.16-rc5 (1) 33 9,739,896 35,435 2,476,666 30,301
lu-zone (2) 33 3.1% 8.2% 10,043,706 60,943 2,680,570 42,346
4.16-rc5-nz (3) 33 4.6% 16.8% 10,191,082 51,348 2,893,385 32,717
4.16-rc5 (1) 34 9,833,955 39,366 2,628,480 36,567
lu-zone (2) 34 3.5% 2.7% 10,180,871 50,050 2,699,941 42,804
4.16-rc5-nz (3) 34 5.0% 7.3% 10,323,136 50,767 2,820,628 30,551
4.16-rc5 (1) 35 9,908,832 20,826 2,666,415 51,379
lu-zone (2) 35 3.5% 0.5% 10,251,385 58,551 2,679,925 49,143
4.16-rc5-nz (3) 35 5.1% 5.7% 10,418,155 51,726 2,817,192 34,042
4.16-rc5 (1) 36 9,969,311 20,377 2,563,399 36,720
lu-zone (2) 36 3.5% 4.8% 10,314,449 60,867 2,686,176 42,925
4.16-rc5-nz (3) 36 5.4% 9.1% 10,504,881 53,100 2,796,816 37,461
4.16-rc5 (1) 37 10,077,169 36,182 2,584,728 32,672
lu-zone (2) 37 3.1% 7.4% 10,393,453 63,048 2,775,523 39,745
4.16-rc5-nz (3) 37 4.7% 11.9% 10,549,870 45,280 2,893,000 39,102
4.16-rc5 (1) 38 10,115,997 25,835 2,653,036 33,259
lu-zone (2) 38 2.7% 5.7% 10,388,901 63,402 2,803,290 36,020
4.16-rc5-nz (3) 38 4.6% 11.2% 10,580,796 63,516 2,949,834 31,421
4.16-rc5 (1) 39 10,162,757 33,118 2,681,195 30,591
lu-zone (2) 39 2.5% 3.0% 10,413,010 76,719 2,761,752 32,471
4.16-rc5-nz (3) 39 4.0% 9.5% 10,568,061 65,614 2,935,127 38,463
4.16-rc5 (1) 40 10,223,472 41,882 2,670,421 26,049
lu-zone (2) 40 2.4% 5.0% 10,470,977 58,008 2,803,478 37,111
4.16-rc5-nz (3) 40 4.1% 7.4% 10,646,450 54,810 2,868,986 52,724
