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Message-ID: <69115878-ec5e-4f7c-bb3e-9f61cce75c70@arm.com> Date: Thu, 13 Nov 2025 15:21:47 +0000 From: Christian Loehle <christian.loehle@....com> To: "Rafael J. Wysocki" <rafael@...nel.org>, Linux PM <linux-pm@...r.kernel.org> Cc: LKML <linux-kernel@...r.kernel.org>, Reka Norman <rekanorman@...omium.org> Subject: Re: [PATCH v1 0/4] cpuidle: governors: teo: Assorted improvements On 11/12/25 16:21, Rafael J. Wysocki wrote: > Hi, > > This is a bunch of teo cpuidle governor improvements, some of which are related > to a bug report discussed recently: > > https://lore.kernel.org/linux-pm/CAEmPcwsNMNnNXuxgvHTQ93Mx-q3Oz9U57THQsU_qdcCx1m4w5g@mail.gmail.com/ > > The first patch fixes a bug that may cause an overly deep idle state > to be selected when the scheduler tick has been already stopped. > > Patch [2/4] removes an unnecessary function argument. > > Patch [3/4] makes teo_update() to use s64 as the data type for its local > variables more consistently. > > The last patch reworks the governor's decay implementation to also decay > metric values lower than 8. > Tested-by: Christian Loehle <christian.loehle@....com> Test results below, although there really isn't anything interesting in there. teo-1 to teo-4 (patches 1 to 4 respectively are essentially indistinguishable from teo-m = mainline) device gov iter iops idles idle_miss ratio belows aboves mmcblk1 teo-m 0 2330 644806 69 0.000 47 22 mmcblk1 teo-m 1 2328 642994 102 0.000 66 36 mmcblk1 teo-m 2 2352 644020 44 0.000 28 16 mmcblk1 teo-1 0 2324 582886 174 0.000 52 122 mmcblk1 teo-1 1 2350 584012 57 0.000 45 12 mmcblk1 teo-1 2 2329 642238 55 0.000 36 19 mmcblk1 teo-2 0 2327 627590 90 0.000 40 50 mmcblk1 teo-2 1 2328 640178 62 0.000 43 19 mmcblk1 teo-2 2 2327 590950 109 0.000 97 12 mmcblk1 teo-3 0 2328 644366 55 0.000 41 14 mmcblk1 teo-3 1 2327 642740 57 0.000 31 26 mmcblk1 teo-3 2 2327 638428 77 0.000 51 26 mmcblk1 teo-4 0 2326 614326 137 0.000 35 102 mmcblk1 teo-4 1 2328 639990 29 0.000 24 5 mmcblk1 teo-4 2 2327 643086 62 0.000 41 21 mmcblk1 teo-6-6 0 2329 596768 1753 0.003 1686 67 mmcblk1 teo-6-6 1 2330 600324 1527 0.003 1495 32 mmcblk1 teo-6-6 2 2331 600110 1439 0.002 1397 42 mmcblk1 teo-6-12 0 2347 741170 6 0.000 4 2 mmcblk1 teo-6-12 1 2329 782232 0 0.000 4 2 mmcblk1 teo-6-12 2 2328 775652 10 0.000 8 2 mmcblk2 teo-m 0 5758 860660 61 0.000 47 14 mmcblk2 teo-m 1 5731 827264 493 0.001 477 16 mmcblk2 teo-m 2 5700 861346 69 0.000 50 19 mmcblk2 teo-1 0 5663 848222 708 0.001 666 42 mmcblk2 teo-1 1 5648 704886 563 0.001 528 35 mmcblk2 teo-1 2 5655 705698 208 0.000 161 47 mmcblk2 teo-2 0 5697 908264 326 0.000 316 10 mmcblk2 teo-2 1 5656 720270 592 0.001 515 77 mmcblk2 teo-2 2 5641 673948 540 0.001 501 39 mmcblk2 teo-3 0 5675 724770 709 0.001 666 43 mmcblk2 teo-3 1 5675 792828 1144 0.001 892 252 mmcblk2 teo-3 2 5701 909848 660 0.001 332 328 mmcblk2 teo-4 0 5673 860736 798 0.001 791 7 mmcblk2 teo-4 1 5606 508886 1786 0.004 1727 59 mmcblk2 teo-4 2 5632 569238 104 0.000 73 31 mmcblk2 teo-6-6 0 5692 848824 1748 0.002 1685 63 mmcblk2 teo-6-6 1 5898 876180 1225 0.001 1215 10 mmcblk2 teo-6-6 2 5646 633846 2248 0.004 2199 49 mmcblk2 teo-6-12 0 5869 1009742 9 0.000 6 3 mmcblk2 teo-6-12 1 5644 775326 4 0.000 4 0 mmcblk2 teo-6-12 2 5671 904480 4 0.000 4 0 nvme0n1 teo-m 0 10342 765802 152 0.000 55 97 nvme0n1 teo-m 1 10703 789232 157 0.000 52 105 nvme0n1 teo-m 2 10405 770046 62 0.000 34 28 nvme0n1 teo-1 0 10687 782984 84 0.000 40 44 nvme0n1 teo-1 1 11326 829102 79 0.000 33 46 nvme0n1 teo-1 2 10636 780884 197 0.000 98 99 nvme0n1 teo-2 0 10951 803155 108 0.000 39 69 nvme0n1 teo-2 1 11468 837334 55 0.000 35 20 nvme0n1 teo-2 2 10410 773154 148 0.000 63 85 nvme0n1 teo-3 0 10701 787882 101 0.000 47 54 nvme0n1 teo-3 1 10403 767178 54 0.000 31 23 nvme0n1 teo-3 2 10749 785898 209 0.000 51 158 nvme0n1 teo-4 0 10462 768442 149 0.000 56 93 nvme0n1 teo-4 1 10642 777534 85 0.000 45 40 nvme0n1 teo-4 2 10486 775710 172 0.000 62 110 nvme0n1 teo-6-6 0 11507 798450 1564 0.002 1505 59 nvme0n1 teo-6-6 1 10499 735294 2009 0.003 1879 130 nvme0n1 teo-6-6 2 10598 740936 1756 0.002 1477 279 nvme0n1 teo-6-12 0 10542 922846 18 0.000 12 6 nvme0n1 teo-6-12 1 10482 922114 23 0.000 16 7 nvme0n1 teo-6-12 2 11046 940398 23 0.000 17 6 sda teo-m 0 1269 778958 111 0.000 108 3 sda teo-m 1 1268 831064 1064 0.001 1054 10 sda teo-m 2 1270 803714 2044 0.003 2034 10 sda teo-1 0 1273 776836 143 0.000 131 12 sda teo-1 1 1272 801800 2043 0.003 2043 0 sda teo-1 2 1270 788906 165 0.000 155 10 sda teo-2 0 1271 763694 79 0.000 68 11 sda teo-2 1 1270 753904 66 0.000 62 4 sda teo-2 2 1272 806804 45 0.000 38 7 sda teo-3 0 1271 812758 1497 0.002 1494 3 sda teo-3 1 1270 800006 49 0.000 48 1 sda teo-3 2 1272 829854 358 0.000 356 2 sda teo-4 0 1270 886646 243 0.000 239 4 sda teo-4 1 1269 820968 40 0.000 38 2 sda teo-4 2 1272 835716 124 0.000 109 15 sda teo-6-6 0 1257 591486 5450 0.009 5435 15 sda teo-6-6 1 1265 788536 4412 0.006 4404 8 sda teo-6-6 2 1254 788282 4470 0.006 4461 9 sda teo-6-12 0 1274 841398 0 0.000 4461 9 sda teo-6-12 1 1271 840824 0 0.000 4461 9 sda teo-6-12 2 1272 923816 4 0.000 4 0 nullb0 teo-m 0 101284 114406 178 0.002 70 108 nullb0 teo-m 1 101381 112804 496 0.004 303 193 nullb0 teo-m 2 101716 100370 380 0.004 225 155 nullb0 teo-1 0 101353 101198 366 0.004 202 164 nullb0 teo-1 1 100571 105004 168 0.002 87 81 nullb0 teo-1 2 101311 110644 56 0.001 26 30 nullb0 teo-2 0 100961 113126 261 0.002 159 102 nullb0 teo-2 1 101346 111776 463 0.004 261 202 nullb0 teo-2 2 101287 109772 277 0.003 137 140 nullb0 teo-3 0 101448 113264 239 0.002 141 98 nullb0 teo-3 1 101077 112294 301 0.003 47 254 nullb0 teo-3 2 100097 116756 423 0.004 267 156 nullb0 teo-4 0 99562 109606 52 0.000 30 22 nullb0 teo-4 1 101131 113982 136 0.001 45 91 nullb0 teo-4 2 100618 113698 144 0.001 41 103 nullb0 teo-6-6 0 101295 74346 2369 0.032 2139 230 nullb0 teo-6-6 1 101299 75350 1943 0.026 1803 140 nullb0 teo-6-6 2 100578 73924 2317 0.031 2089 228 nullb0 teo-6-12 0 100005 269180 7 0.000 4 3 nullb0 teo-6-12 1 100705 315302 0 0.000 4 3 nullb0 teo-6-12 2 100861 293350 6 0.000 3 3 mtdblock3 teo-m 0 262 312586 66 0.000 47 19 mtdblock3 teo-m 1 259 635682 100 0.000 97 3 mtdblock3 teo-m 2 258 771110 128 0.000 89 39 mtdblock3 teo-1 0 256 601566 7409 0.012 7396 13 mtdblock3 teo-1 1 260 535040 75 0.000 55 20 mtdblock3 teo-1 2 259 702118 1844 0.003 1820 24 mtdblock3 teo-2 0 261 312978 1813 0.006 1789 24 mtdblock3 teo-2 1 255 891548 3095 0.003 3090 5 mtdblock3 teo-2 2 259 680754 234 0.000 223 11 mtdblock3 teo-3 0 259 649474 102 0.000 94 8 mtdblock3 teo-3 1 260 552324 223 0.000 182 41 mtdblock3 teo-3 2 258 734378 1562 0.002 1551 11 mtdblock3 teo-4 0 257 762430 2438 0.003 2430 8 mtdblock3 teo-4 1 252 894318 9326 0.010 9314 12 mtdblock3 teo-4 2 258 663502 1437 0.002 1421 16 mtdblock3 teo-6-6 0 258 782434 1611 0.002 1572 39 mtdblock3 teo-6-6 1 259 591852 1658 0.003 1532 126 mtdblock3 teo-6-6 2 262 274192 1523 0.006 1432 91 mtdblock3 teo-6-12 0 256 986250 11 0.000 10 1 mtdblock3 teo-6-12 1 258 853982 11 0.000 9 2 mtdblock3 teo-6-12 2 260 654184 7 0.000 6 1 test gov i score %change idles idle_miss miss_rt belows aboves schbench teo-m 0 196 0 26276 12 0.000 10 2 schbench teo-m 1 195 -0 25668 23 0.001 19 4 schbench teo-m 2 208 6 26180 24 0.001 21 3 schbench teo-m 3 191 -2 25384 4 0.000 3 1 schbench teo-m 4 194 -1 26060 31 0.001 21 10 schbench teo-1 0 195 -0 26476 10 0.000 9 1 schbench teo-1 1 194 -1 24880 9 0.000 9 0 schbench teo-1 2 194 -1 24540 10 0.000 8 2 schbench teo-1 3 195 -1 26246 30 0.001 23 7 schbench teo-1 4 194 -1 26060 15 0.001 11 4 schbench teo-2 0 198 1 27150 19 0.001 13 6 schbench teo-2 1 195 -0 25354 8 0.000 8 0 schbench teo-2 2 194 -1 24396 21 0.001 18 3 schbench teo-2 3 193 -1 26044 20 0.001 18 2 schbench teo-2 4 195 -0 26444 22 0.001 20 2 schbench teo-3 0 192 -2 24988 10 0.000 9 1 schbench teo-3 1 193 -1 25936 9 0.000 7 2 schbench teo-3 2 190 -3 25218 14 0.001 13 1 schbench teo-3 3 191 -2 25612 12 0.000 9 3 schbench teo-3 4 192 -2 24892 28 0.001 17 11 schbench teo-4 0 197 1 26768 16 0.001 14 2 schbench teo-4 1 193 -1 26352 15 0.001 13 2 schbench teo-4 2 194 -1 26158 15 0.001 14 1 schbench teo-4 3 203 4 27536 28 0.001 26 2 schbench teo-4 4 192 -2 24806 19 0.001 15 4 schbench teo-6-6 0 199 2 24676 128 0.005 121 7 schbench teo-6-6 1 211 8 26794 127 0.005 117 10 schbench teo-6-6 2 205 5 25026 140 0.006 125 15 schbench teo-6-6 3 198 1 24816 196 0.008 174 22 schbench teo-6-6 4 198 1 26604 236 0.009 218 18 schbench teo-6-12 0 190 -3 24464 0 0.000 218 18 schbench teo-6-12 1 190 -3 25274 0 0.000 218 18 schbench teo-6-12 2 190 -3 25256 0 0.000 218 18 schbench teo-6-12 3 199 2 26342 0 0.000 218 18 schbench teo-6-12 4 188 -4 25508 0 0.000 218 18 ebizzy teo-m 0 10733 0 1358 7 0.005 7 0 ebizzy teo-m 1 10750 0 1206 12 0.010 8 4 ebizzy teo-m 2 10699 -0 1950 24 0.012 23 1 ebizzy teo-m 3 10773 0 1384 18 0.013 16 2 ebizzy teo-m 4 10667 -1 2060 24 0.012 23 1 ebizzy teo-1 0 10770 0 1858 22 0.012 19 3 ebizzy teo-1 1 10719 -0 1258 4 0.003 4 0 ebizzy teo-1 2 10704 -0 1422 5 0.004 5 0 ebizzy teo-1 3 10719 -0 1568 16 0.010 14 2 ebizzy teo-1 4 10802 1 1288 11 0.009 11 0 ebizzy teo-2 0 10669 -1 1126 11 0.010 9 2 ebizzy teo-2 1 10696 -0 1733 18 0.010 14 4 ebizzy teo-2 2 10676 -1 1620 17 0.010 14 3 ebizzy teo-2 3 10737 0 1332 10 0.008 9 1 ebizzy teo-2 4 10696 -0 1290 8 0.006 8 0 ebizzy teo-3 0 10650 -1 1448 12 0.008 9 3 ebizzy teo-3 1 10689 -0 1470 12 0.008 12 0 ebizzy teo-3 2 10642 -1 1612 19 0.012 15 4 ebizzy teo-3 3 10705 -0 1462 10 0.007 8 2 ebizzy teo-3 4 10717 -0 1798 21 0.012 19 2 ebizzy teo-4 0 10625 -1 1324 12 0.009 8 4 ebizzy teo-4 1 10705 -0 1430 12 0.008 11 1 ebizzy teo-4 2 10671 -1 1818 19 0.010 16 3 ebizzy teo-4 3 10688 -0 1616 8 0.005 8 0 ebizzy teo-4 4 10724 -0 1882 11 0.006 9 2 ebizzy teo-6-6 0 10659 -1 1442 58 0.040 46 12 ebizzy teo-6-6 1 10653 -1 1144 43 0.038 41 2 ebizzy teo-6-6 2 10696 -0 1256 37 0.029 35 2 ebizzy teo-6-6 3 10710 -0 1168 43 0.037 38 5 ebizzy teo-6-6 4 10696 -0 1166 47 0.040 43 4 ebizzy teo-6-12 0 10709 -0 2186 0 0.000 43 4 ebizzy teo-6-12 1 10687 -0 1688 0 0.000 43 4 ebizzy teo-6-12 2 10689 -0 2806 0 0.000 43 4 ebizzy teo-6-12 3 10734 0 1426 0 0.000 43 4 ebizzy teo-6-12 4 10757 0 2346 0 0.000 43 4 adrestia teo-m 0 8 0 103680 21 0.000 19 2 adrestia teo-m 1 12 50 104026 31 0.000 16 15 adrestia teo-m 2 12 50 104063 32 0.000 24 8 adrestia teo-m 3 12 50 104768 44 0.000 22 22 adrestia teo-m 4 12 50 104388 18 0.000 16 2 adrestia teo-1 0 12 50 104152 26 0.000 15 11 adrestia teo-1 1 12 50 103556 12 0.000 9 3 adrestia teo-1 2 11 38 104202 36 0.000 24 12 adrestia teo-1 3 12 50 104014 25 0.000 17 8 adrestia teo-1 4 11 38 103388 12 0.000 11 1 adrestia teo-2 0 12 50 103492 25 0.000 12 13 adrestia teo-2 1 12 50 103924 29 0.000 17 12 adrestia teo-2 2 12 50 103674 19 0.000 13 6 adrestia teo-2 3 12 50 104464 41 0.000 28 13 adrestia teo-2 4 12 50 103758 16 0.000 8 8 adrestia teo-3 0 12 50 103984 25 0.000 12 13 adrestia teo-3 1 11 38 103556 23 0.000 14 9 adrestia teo-3 2 12 50 104088 22 0.000 17 5 adrestia teo-3 3 12 50 104430 48 0.000 26 22 adrestia teo-3 4 12 50 103968 26 0.000 18 8 adrestia teo-4 0 12 50 103924 19 0.000 14 5 adrestia teo-4 1 8 0 103228 14 0.000 10 4 adrestia teo-4 2 12 50 104124 15 0.000 10 5 adrestia teo-4 3 12 50 104472 22 0.000 16 6 adrestia teo-4 4 12 50 103554 30 0.000 16 14 adrestia teo-6-6 0 12 50 102832 61 0.001 51 10 adrestia teo-6-6 1 12 50 103136 52 0.001 38 14 adrestia teo-6-6 2 12 50 102882 37 0.000 29 8 adrestia teo-6-6 3 12 50 103102 51 0.000 40 11 adrestia teo-6-6 4 12 50 103260 60 0.001 43 17 adrestia teo-6-12 0 12 50 112320 0 0.000 43 17 adrestia teo-6-12 1 12 50 114412 0 0.000 43 17 adrestia teo-6-12 2 11 38 112220 0 0.000 43 17 adrestia teo-6-12 3 12 50 112028 0 0.000 43 17 adrestia teo-6-12 4 12 50 112750 0 0.000 43 17
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