Re: OOPS: 2.6.16-rc6 cpufreq_conservative
From: Parag Warudkar
Date: Sat Mar 18 2006 - 17:06:26 EST
On Saturday 18 March 2006 16:40, Linus Torvalds wrote:
> Anyway, I _think_ it's this one:
>
> for_each_online_cpu(j) {
> dbs_info = &per_cpu(cpu_dbs_info, j);
> requested_freq[j] = dbs_info->cur_policy->cur;
> }
Here is the disassembly of cpufrequency_conservative.o:dbs_check_cpu() from my
setup, if it is of any help.
000004b0 <dbs_check_cpu>:
4b0: 55 push %ebp
4b1: bd 00 00 00 00 mov $0x0,%ebp
4b6: 89 e8 mov %ebp,%eax
4b8: 57 push %edi
4b9: 56 push %esi
4ba: 53 push %ebx
4bb: 83 ec 10 sub $0x10,%esp
4be: 8b 54 24 24 mov 0x24(%esp),%edx
4c2: 8b 0c 95 00 00 00 00 mov 0x0(,%edx,4),%ecx
4c9: 01 c8 add %ecx,%eax
4cb: 8b 50 0c mov 0xc(%eax),%edx
4ce: 85 d2 test %edx,%edx
4d0: 0f 84 ba 01 00 00 je 690 <dbs_check_cpu+0x1e0>
4d6: 66 83 3d 10 00 00 00 cmpw $0x0,0x10
4dd: 00
4de: 8b 00 mov (%eax),%eax
4e0: 89 44 24 0c mov %eax,0xc(%esp)
4e4: 0f 84 ae 01 00 00 je 698 <dbs_check_cpu+0x1e8>
4ea: 8b 4c 24 0c mov 0xc(%esp),%ecx
4ee: bf ff ff ff ff mov $0xffffffff,%edi
4f3: 8b 01 mov (%ecx),%eax
4f5: 85 c0 test %eax,%eax
4f7: 0f 85 23 02 00 00 jne 720 <dbs_check_cpu+0x270>
4fd: b8 20 00 00 00 mov $0x20,%eax
502: eb 52 jmp 556 <dbs_check_cpu+0xa6>
504: 8b 14 9d 00 00 00 00 mov 0x0(,%ebx,4),%edx
50b: 89 e8 mov %ebp,%eax
50d: 8b 0d 60 00 00 00 mov 0x60,%ecx
513: 8d 34 02 lea (%edx,%eax,1),%esi
516: b8 00 00 00 00 mov $0x0,%eax
51b: 8d 04 02 lea (%edx,%eax,1),%eax
51e: 8b 50 30 mov 0x30(%eax),%edx
521: 03 50 28 add 0x28(%eax),%edx
524: 85 c9 test %ecx,%ecx
526: 74 03 je 52b <dbs_check_cpu+0x7b>
528: 03 50 08 add 0x8(%eax),%edx
52b: 8b 4e 04 mov 0x4(%esi),%ecx
52e: 89 d0 mov %edx,%eax
530: 89 56 04 mov %edx,0x4(%esi)
533: 29 c8 sub %ecx,%eax
535: 39 f8 cmp %edi,%eax
537: 0f 42 f8 cmovb %eax,%edi
53a: 8d 43 01 lea 0x1(%ebx),%eax
53d: 89 44 24 08 mov %eax,0x8(%esp)
541: b8 02 00 00 00 mov $0x2,%eax
546: 89 44 24 04 mov %eax,0x4(%esp)
54a: 8b 44 24 0c mov 0xc(%esp),%eax
54e: 89 04 24 mov %eax,(%esp)
551: e8 fc ff ff ff call 552 <dbs_check_cpu+0xa2>
556: 83 f8 03 cmp $0x3,%eax
559: bb 02 00 00 00 mov $0x2,%ebx
55e: 0f 4c d8 cmovl %eax,%ebx
561: 83 fb 01 cmp $0x1,%ebx
564: 76 9e jbe 504 <dbs_check_cpu+0x54>
566: 8d 04 bf lea (%edi,%edi,4),%eax
569: 8b 35 50 00 00 00 mov 0x50,%esi
56f: b9 64 00 00 00 mov $0x64,%ecx
574: 8d 04 80 lea (%eax,%eax,4),%eax
577: ba fe ff ff 7f mov $0x7ffffffe,%edx
57c: 8d 1c 85 00 00 00 00 lea 0x0(,%eax,4),%ebx
583: a1 58 00 00 00 mov 0x58,%eax
588: 29 c1 sub %eax,%ecx
58a: 81 fe c0 e0 ff ff cmp $0xffffe0c0,%esi
590: 77 10 ja 5a2 <dbs_check_cpu+0xf2>
592: 8d 96 9f 0f 00 00 lea 0xf9f(%esi),%edx
598: b8 d3 4d 62 10 mov $0x10624dd3,%eax
59d: f7 e2 mul %edx
59f: c1 ea 08 shr $0x8,%edx
5a2: 0f af ca imul %edx,%ecx
5a5: 39 cb cmp %ecx,%ebx
5a7: 0f 83 7b 01 00 00 jae 728 <dbs_check_cpu+0x278>
5ad: 8b 54 24 24 mov 0x24(%esp),%edx
5b1: 31 c0 xor %eax,%eax
5b3: 8b 4c 24 0c mov 0xc(%esp),%ecx
5b7: 89 04 95 00 00 00 00 mov %eax,0x0(,%edx,4)
5be: 8b 01 mov (%ecx),%eax
5c0: 85 c0 test %eax,%eax
5c2: 0f 84 ca 02 00 00 je 892 <dbs_check_cpu+0x3e2>
5c8: 0f bc c0 bsf %eax,%eax
5cb: 83 f8 03 cmp $0x3,%eax
5ce: bb 02 00 00 00 mov $0x2,%ebx
5d3: 0f 4c d8 cmovl %eax,%ebx
5d6: 83 fb 01 cmp $0x1,%ebx
5d9: 77 40 ja 61b <dbs_check_cpu+0x16b>
5db: 89 ee mov %ebp,%esi
5dd: 8d 76 00 lea 0x0(%esi),%esi
5e0: 8b 14 9d 00 00 00 00 mov 0x0(,%ebx,4),%edx
5e7: 01 f2 add %esi,%edx
5e9: 8b 42 04 mov 0x4(%edx),%eax
5ec: 89 42 08 mov %eax,0x8(%edx)
5ef: 8d 43 01 lea 0x1(%ebx),%eax
5f2: bb 02 00 00 00 mov $0x2,%ebx
5f7: 89 44 24 08 mov %eax,0x8(%esp)
5fb: b8 02 00 00 00 mov $0x2,%eax
600: 89 44 24 04 mov %eax,0x4(%esp)
604: 8b 44 24 0c mov 0xc(%esp),%eax
608: 89 04 24 mov %eax,(%esp)
60b: e8 fc ff ff ff call 60c <dbs_check_cpu+0x15c>
610: 83 f8 03 cmp $0x3,%eax
613: 0f 4c d8 cmovl %eax,%ebx
616: 83 fb 01 cmp $0x1,%ebx
619: 76 c5 jbe 5e0 <dbs_check_cpu+0x130>
61b: 8b 54 24 24 mov 0x24(%esp),%edx
61f: 8b 0c 95 08 00 00 00 mov 0x8(,%edx,4),%ecx
626: 8b 54 24 0c mov 0xc(%esp),%edx
62a: 8b 42 18 mov 0x18(%edx),%eax
62d: 39 c1 cmp %eax,%ecx
62f: 74 5f je 690 <dbs_check_cpu+0x1e0>
631: 8b 15 64 00 00 00 mov 0x64,%edx
637: 0f af d0 imul %eax,%edx
63a: b8 1f 85 eb 51 mov $0x51eb851f,%eax
63f: f7 e2 mul %edx
641: b8 05 00 00 00 mov $0x5,%eax
646: c1 ea 05 shr $0x5,%edx
649: 0f 44 d0 cmove %eax,%edx
64c: 8d 04 11 lea (%ecx,%edx,1),%eax
64f: 8b 4c 24 24 mov 0x24(%esp),%ecx
653: 89 04 8d 08 00 00 00 mov %eax,0x8(,%ecx,4)
65a: 8b 4c 24 0c mov 0xc(%esp),%ecx
65e: 8b 51 18 mov 0x18(%ecx),%edx
661: 39 d0 cmp %edx,%eax
663: 76 0d jbe 672 <dbs_check_cpu+0x1c2>
665: 89 d0 mov %edx,%eax
667: 8b 54 24 24 mov 0x24(%esp),%edx
66b: 89 04 95 08 00 00 00 mov %eax,0x8(,%edx,4)
672: 89 44 24 04 mov %eax,0x4(%esp)
676: 8b 4c 24 0c mov 0xc(%esp),%ecx
67a: ba 01 00 00 00 mov $0x1,%edx
67f: 89 54 24 08 mov %edx,0x8(%esp)
683: 89 0c 24 mov %ecx,(%esp)
686: e8 fc ff ff ff call 687 <dbs_check_cpu+0x1d7>
68b: 90 nop
68c: 8d 74 26 00 lea 0x0(%esi),%esi
690: 83 c4 10 add $0x10,%esp
693: 5b pop %ebx
694: 5e pop %esi
695: 5f pop %edi
696: 5d pop %ebp
697: c3 ret
698: a1 00 00 00 00 mov 0x0,%eax
69d: 85 c0 test %eax,%eax
69f: 0f 84 e3 01 00 00 je 888 <dbs_check_cpu+0x3d8>
6a5: 0f bc c0 bsf %eax,%eax
6a8: 83 f8 03 cmp $0x3,%eax
6ab: bb 02 00 00 00 mov $0x2,%ebx
6b0: 0f 4c d8 cmovl %eax,%ebx
6b3: 83 fb 01 cmp $0x1,%ebx
6b6: 77 49 ja 701 <dbs_check_cpu+0x251>
6b8: 89 ee mov %ebp,%esi
6ba: 8d b6 00 00 00 00 lea 0x0(%esi),%esi
6c0: 8b 04 9d 00 00 00 00 mov 0x0(,%ebx,4),%eax
6c7: bf 02 00 00 00 mov $0x2,%edi
6cc: 01 f0 add %esi,%eax
6ce: 8b 00 mov (%eax),%eax
6d0: 8b 40 1c mov 0x1c(%eax),%eax
6d3: 89 7c 24 04 mov %edi,0x4(%esp)
6d7: c7 04 24 00 00 00 00 movl $0x0,(%esp)
6de: 89 04 9d 08 00 00 00 mov %eax,0x8(,%ebx,4)
6e5: 8d 43 01 lea 0x1(%ebx),%eax
6e8: bb 02 00 00 00 mov $0x2,%ebx
6ed: 89 44 24 08 mov %eax,0x8(%esp)
6f1: e8 fc ff ff ff call 6f2 <dbs_check_cpu+0x242>
6f6: 83 f8 03 cmp $0x3,%eax
6f9: 0f 4c d8 cmovl %eax,%ebx
6fc: 83 fb 01 cmp $0x1,%ebx
6ff: 76 bf jbe 6c0 <dbs_check_cpu+0x210>
701: 8b 4c 24 0c mov 0xc(%esp),%ecx
705: bb 01 00 00 00 mov $0x1,%ebx
70a: bf ff ff ff ff mov $0xffffffff,%edi
70f: 66 89 1d 10 00 00 00 mov %bx,0x10
716: 8b 01 mov (%ecx),%eax
718: 85 c0 test %eax,%eax
71a: 0f 84 dd fd ff ff je 4fd <dbs_check_cpu+0x4d>
720: 0f bc c0 bsf %eax,%eax
723: e9 2e fe ff ff jmp 556 <dbs_check_cpu+0xa6>
728: 8b 54 24 24 mov 0x24(%esp),%edx
72c: 8b 04 95 00 00 00 00 mov 0x0(,%edx,4),%eax
733: 40 inc %eax
734: 89 04 95 00 00 00 00 mov %eax,0x0(,%edx,4)
73b: 8b 15 54 00 00 00 mov 0x54,%edx
741: 39 d0 cmp %edx,%eax
743: 0f 82 47 ff ff ff jb 690 <dbs_check_cpu+0x1e0>
749: 8b 4c 24 0c mov 0xc(%esp),%ecx
74d: bf ff ff ff ff mov $0xffffffff,%edi
752: 8b 01 mov (%ecx),%eax
754: 85 c0 test %eax,%eax
756: 0f 85 40 01 00 00 jne 89c <dbs_check_cpu+0x3ec>
75c: b8 20 00 00 00 mov $0x20,%eax
761: 83 f8 03 cmp $0x3,%eax
764: bb 02 00 00 00 mov $0x2,%ebx
769: 0f 4c d8 cmovl %eax,%ebx
76c: 83 fb 01 cmp $0x1,%ebx
76f: 77 64 ja 7d5 <dbs_check_cpu+0x325>
771: 89 ee mov %ebp,%esi
773: 8d b6 00 00 00 00 lea 0x0(%esi),%esi
779: 8d bc 27 00 00 00 00 lea 0x0(%edi),%edi
780: 8b 04 9d 00 00 00 00 mov 0x0(,%ebx,4),%eax
787: 01 f0 add %esi,%eax
789: 8b 50 04 mov 0x4(%eax),%edx
78c: 8b 68 08 mov 0x8(%eax),%ebp
78f: 89 d1 mov %edx,%ecx
791: 29 e9 sub %ebp,%ecx
793: 89 50 08 mov %edx,0x8(%eax)
796: 8d 43 01 lea 0x1(%ebx),%eax
799: 39 f9 cmp %edi,%ecx
79b: 89 44 24 08 mov %eax,0x8(%esp)
79f: 8b 44 24 0c mov 0xc(%esp),%eax
7a3: bd 02 00 00 00 mov $0x2,%ebp
7a8: 0f 42 f9 cmovb %ecx,%edi
7ab: 89 6c 24 04 mov %ebp,0x4(%esp)
7af: 89 04 24 mov %eax,(%esp)
7b2: e8 fc ff ff ff call 7b3 <dbs_check_cpu+0x303>
7b7: 83 f8 03 cmp $0x3,%eax
7ba: ba 02 00 00 00 mov $0x2,%edx
7bf: 0f 4d c2 cmovge %edx,%eax
7c2: 83 f8 01 cmp $0x1,%eax
7c5: 89 c3 mov %eax,%ebx
7c7: 76 b7 jbe 780 <dbs_check_cpu+0x2d0>
7c9: 8b 35 50 00 00 00 mov 0x50,%esi
7cf: 8b 15 54 00 00 00 mov 0x54,%edx
7d5: 8d 04 bf lea (%edi,%edi,4),%eax
7d8: 8b 4c 24 24 mov 0x24(%esp),%ecx
7dc: 8d 04 80 lea (%eax,%eax,4),%eax
7df: 8d 1c 85 00 00 00 00 lea 0x0(,%eax,4),%ebx
7e6: 89 f0 mov %esi,%eax
7e8: 0f af c2 imul %edx,%eax
7eb: 8b 35 5c 00 00 00 mov 0x5c,%esi
7f1: 31 ff xor %edi,%edi
7f3: ba fe ff ff 7f mov $0x7ffffffe,%edx
7f8: 89 3c 8d 00 00 00 00 mov %edi,0x0(,%ecx,4)
7ff: b9 64 00 00 00 mov $0x64,%ecx
804: 29 f1 sub %esi,%ecx
806: 3d c0 e0 ff ff cmp $0xffffe0c0,%eax
80b: 77 10 ja 81d <dbs_check_cpu+0x36d>
80d: 8d 90 9f 0f 00 00 lea 0xf9f(%eax),%edx
813: b8 d3 4d 62 10 mov $0x10624dd3,%eax
818: f7 e2 mul %edx
81a: c1 ea 08 shr $0x8,%edx
81d: 0f af ca imul %edx,%ecx
820: 39 cb cmp %ecx,%ebx
822: 0f 86 68 fe ff ff jbe 690 <dbs_check_cpu+0x1e0>
828: 8b 44 24 24 mov 0x24(%esp),%eax
82c: 8b 54 24 0c mov 0xc(%esp),%edx
830: 8b 0c 85 08 00 00 00 mov 0x8(,%eax,4),%ecx
837: 3b 4a 14 cmp 0x14(%edx),%ecx
83a: 0f 84 50 fe ff ff je 690 <dbs_check_cpu+0x1e0>
840: a1 64 00 00 00 mov 0x64,%eax
845: 85 c0 test %eax,%eax
847: 0f 84 43 fe ff ff je 690 <dbs_check_cpu+0x1e0>
84d: 8b 5a 18 mov 0x18(%edx),%ebx
850: ba 1f 85 eb 51 mov $0x51eb851f,%edx
855: 0f af c3 imul %ebx,%eax
858: f7 e2 mul %edx
85a: b8 05 00 00 00 mov $0x5,%eax
85f: c1 ea 05 shr $0x5,%edx
862: 0f 44 d0 cmove %eax,%edx
865: 89 c8 mov %ecx,%eax
867: 8b 4c 24 24 mov 0x24(%esp),%ecx
86b: 29 d0 sub %edx,%eax
86d: 89 04 8d 08 00 00 00 mov %eax,0x8(,%ecx,4)
874: 8b 4c 24 0c mov 0xc(%esp),%ecx
878: 8b 51 14 mov 0x14(%ecx),%edx
87b: 39 d0 cmp %edx,%eax
87d: 0f 83 ef fd ff ff jae 672 <dbs_check_cpu+0x1c2>
883: e9 dd fd ff ff jmp 665 <dbs_check_cpu+0x1b5>
888: b8 20 00 00 00 mov $0x20,%eax
88d: e9 16 fe ff ff jmp 6a8 <dbs_check_cpu+0x1f8>
892: b8 20 00 00 00 mov $0x20,%eax
897: e9 2f fd ff ff jmp 5cb <dbs_check_cpu+0x11b>
89c: 0f bc c0 bsf %eax,%eax
89f: e9 bd fe ff ff jmp 761 <dbs_check_cpu+0x2b1>
8a4: 8d b6 00 00 00 00 lea 0x0(%esi),%esi
8aa: 8d bf 00 00 00 00 lea 0x0(%edi),%edi
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