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Date: Mon, 2 Apr 2018 23:39:02 +0000
From: "Luck, Tony" <tony.luck@...el.com>
To: "Luck, Tony" <tony.luck@...el.com>,
Peter Zijlstra <peterz@...radead.org>
CC: Mel Gorman <mgorman@...hsingularity.net>,
Vincent Guittot <vincent.guittot@...aro.org>,
Patrick Bellasi <patrick.bellasi@....com>,
"Ingo Molnar" <mingo@...nel.org>,
Norbert Manthey <nmanthey@...zon.de>,
"Frederic Weisbecker" <frederic@...nel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: v4.16+ seeing many unaligned access in dequeue_task_fair() on
IA64
> kernel unaligned access to 0xe00000031660fd74, ip=0xa0000001000f23e0
> kernel unaligned access to 0xe00000033bdffbcc, ip=0xa0000001000f2370
Here's the disassembly of dequeu_task_fair() in case it would help to see
which two instructions are getting all the faults:
a0000001000f21c0 <dequeue_task_fair>:
a0000001000f21c0: 08 28 29 0e 80 05 [MMI] alloc r37=ar.pfs,10,7,0
a0000001000f21c6: c0 00 33 7e 46 00 adds r12=-32,r12
a0000001000f21cc: c2 08 85 84 adds r16=4236,r33
a0000001000f21d0: 09 58 40 ab 16 27 [MMI] addl r11=-685232,r1
a0000001000f21d6: 80 02 84 02 42 20 adds r40=128,r33
a0000001000f21dc: 05 10 01 84 mov r41=r34;;
a0000001000f21e0: 08 00 00 00 01 00 [MMI] nop.m 0x0
a0000001000f21e6: f0 00 2c 00 42 80 mov r15=r11
a0000001000f21ec: 04 00 c4 00 mov r36=b0
a0000001000f21f0: 19 30 00 50 07 39 [MMB] cmp.eq p6,p7=0,r40
a0000001000f21f6: 30 00 c0 a3 4e 03 mov r3=-219008
a0000001000f21fc: 60 00 00 41 (p06) br.cond.spnt.few a0000001000f2250 <dequeue_task_fair+0x90>;;
a0000001000f2200: 0b 50 00 20 10 10 [MMI] ld4 r10=[r16];;
a0000001000f2206: 90 50 3c 24 40 00 shladd r9=r10,3,r15
a0000001000f220c: 00 00 04 00 nop.i 0x0;;
a0000001000f2210: 0b 40 00 12 18 10 [MMI] ld8 r8=[r9];;
a0000001000f2216: 60 1a 20 00 40 00 add r38=r3,r8
a0000001000f221c: 00 00 04 00 nop.i 0x0;;
a0000001000f2220: 11 18 71 4c 01 21 [MIB] adds r35=156,r38
a0000001000f2226: 70 02 98 02 42 00 adds r39=128,r38
a0000001000f222c: 68 f3 ff 58 br.call.sptk.many b0=a0000001000f1580 <dequeue_entity>;;
a0000001000f2230: 0a 10 00 46 10 10 [MMI] ld4 r2=[r35];;
a0000001000f2236: e0 f8 0b 7e 46 00 adds r14=-1,r2
a0000001000f223c: 00 00 04 00 nop.i 0x0
a0000001000f2240: 0a 00 00 00 01 00 [MMI] nop.m 0x0;;
a0000001000f2246: 00 70 8c 20 23 00 st4 [r35]=r14
a0000001000f224c: 00 00 04 00 nop.i 0x0
a0000001000f2250: 09 98 c0 02 d7 26 [MMI] addl r19=-2069584,r1
a0000001000f2256: 50 21 80 00 42 00 adds r21=4,r32
a0000001000f225c: 83 01 05 84 adds r24=152,r32;;
a0000001000f2260: 09 90 00 26 18 10 [MMI] ld8 r18=[r19]
a0000001000f2266: 60 01 54 20 20 00 ld4 r22=[r21]
a0000001000f226c: 00 00 04 00 nop.i 0x0;;
a0000001000f2270: 09 a0 fc 2d 3f 23 [MMI] adds r20=-1,r22
a0000001000f2276: 10 01 48 a0 20 00 ld4.a r17=[r18]
a0000001000f227c: 00 00 04 00 nop.i 0x0;;
a0000001000f2280: 08 00 00 00 01 00 [MMI] nop.m 0x0
a0000001000f2286: 00 a0 54 20 23 00 st4 [r21]=r20
a0000001000f228c: a1 8a 24 50 tbit.z p8,p9=r17,21
a0000001000f2290: 18 00 00 00 01 00 [MMB] nop.m 0x0
a0000001000f2296: 10 d9 00 80 02 00 chk.a.clr r17,a0000001000f2440 <dequeue_task_fair+0x280>
a0000001000f229c: 00 00 00 20 nop.b 0x0
a0000001000f22a0: 10 00 00 00 01 00 [MIB] nop.m 0x0
a0000001000f22a6: 00 00 00 02 00 04 nop.i 0x0
a0000001000f22ac: e0 00 00 43 (p08) br.cond.dpnt.few a0000001000f2380 <dequeue_task_fair+0x1c0>
a0000001000f22b0: 0b b8 00 30 10 10 [MMI] ld4 r23=[r24];;
a0000001000f22b6: b0 00 5c 14 73 00 cmp4.eq p11,p10=0,r23
a0000001000f22bc: 00 00 04 00 nop.i 0x0;;
a0000001000f22c0: 71 01 81 40 02 e1 [MIB] (p11) adds r32=288,r32
a0000001000f22c6: 12 01 00 00 42 05 (p11) mov r17=r0
a0000001000f22cc: e0 00 00 42 (p10) br.cond.dptk.few a0000001000f23a0 <dequeue_task_fair+0x1e0>;;
a0000001000f22d0: 09 f8 40 18 00 21 [MMI] adds r31=16,r12
a0000001000f22d6: 00 88 80 60 23 c0 st4.rel [r32]=r17
a0000001000f22dc: 00 10 1d 50 tbit.z p6,p7=r34,0;;
a0000001000f22e0: 10 00 44 3e 90 11 [MIB] st4 [r31]=r17
a0000001000f22e6: 00 00 00 02 00 03 nop.i 0x0
a0000001000f22ec: a0 00 00 43 (p06) br.cond.dpnt.few a0000001000f2380 <dequeue_task_fair+0x1c0>
a0000001000f22f0: 09 88 e0 42 02 21 [MMI] adds r17=312,r33
a0000001000f22f6: e0 80 85 04 42 40 adds r14=304,r33
a0000001000f22fc: c4 0b 09 84 adds r34=316,r33;;
a0000001000f2300: 09 00 01 22 10 10 [MMI] ld4 r32=[r17]
a0000001000f2306: 00 01 88 20 20 00 ld4 r16=[r34]
a0000001000f230c: 00 00 04 00 nop.i 0x0;;
a0000001000f2310: 10 00 00 00 01 00 [MIB] nop.m 0x0
a0000001000f2316: 90 00 80 10 28 04 tbit.z p9,p8=r32,0
a0000001000f231c: 70 00 00 43 (p08) br.cond.dpnt.few a0000001000f2380 <dequeue_task_fair+0x1c0>
a0000001000f2320: 0b 48 01 1c b8 10 [MMI] ld8.acq r41=[r14];;
a0000001000f2326: 10 0a a4 5c 40 00 or r33=1,r41
a0000001000f232c: 00 00 04 00 nop.i 0x0;;
a0000001000f2330: 0b 40 85 20 05 20 [MMI] sub r40=r33,r16;;
a0000001000f2336: 70 4a a0 00 42 00 adds r39=9,r40
a0000001000f233c: 00 00 04 00 nop.i 0x0;;
a0000001000f2340: 0a 58 48 4e 8a f5 [MMI] cmp4.ltu p11,p10=18,r39;;
a0000001000f2346: 82 82 a0 22 c0 e5 (p11) shladd r40=r16,2,r40
a0000001000f234c: 04 62 00 84 (p11) adds r39=32,r12
a0000001000f2350: 62 81 70 18 00 21 [MII] (p11) adds r16=28,r12
a0000001000f2356: 00 00 00 02 80 05 nop.i 0x0;;
a0000001000f235c: 45 40 75 52 (p11) extr.u r40=r40,2,30
a0000001000f2360: 6a 01 84 20 90 d1 [MMI] (p11) st4 [r16]=r33;;
a0000001000f2366: 02 40 9d 20 23 00 (p11) st4 [r39]=r40
a0000001000f236c: 00 00 04 00 nop.i 0x0
*a0000001000f2370: 6a 39 01 20 18 d0 [MMI] (p11) ld8 r39=[r16];;
a0000001000f2376: 02 38 45 70 23 00 (p11) st8.rel [r17]=r39
a0000001000f237c: 00 00 04 00 nop.i 0x0
a0000001000f2380: 00 00 00 00 01 00 [MII] nop.m 0x0
a0000001000f2386: 00 28 01 55 00 00 mov.i ar.pfs=r37
a0000001000f238c: 40 0a 00 07 mov b0=r36
a0000001000f2390: 19 00 00 00 01 00 [MMB] nop.m 0x0
a0000001000f2396: c0 00 31 00 42 80 adds r12=32,r12
a0000001000f239c: 08 00 84 00 br.ret.sptk.many b0;;
a0000001000f23a0: 18 f0 e0 42 02 21 [MMB] adds r30=312,r33
a0000001000f23a6: 00 02 81 04 42 00 adds r32=288,r32
a0000001000f23ac: 00 00 00 20 nop.b 0x0
a0000001000f23b0: 09 e0 50 18 00 21 [MMI] adds r28=20,r12
a0000001000f23b6: f0 81 30 00 42 c0 adds r31=16,r12
a0000001000f23bc: 00 10 1d 50 tbit.z p6,p7=r34,0;;
a0000001000f23c0: 09 e8 00 3c b8 10 [MMI] ld8.acq r29=[r30]
a0000001000f23c6: 10 01 80 20 20 00 ld4 r17=[r32]
a0000001000f23cc: 00 00 04 00 nop.i 0x0;;
a0000001000f23d0: 00 00 00 00 01 00 [MII] nop.m 0x0
a0000001000f23d6: b0 01 76 3e 29 40 shr.u r27=r29,32
a0000001000f23dc: 03 e8 00 84 mov r26=r29
*a0000001000f23e0: 0b 00 74 38 98 11 [MMI] st8 [r28]=r29;;
a0000001000f23e6: f0 e8 6c 1c 69 00 cmp4.ltu p15,p14=r29,r27
a0000001000f23ec: 00 00 04 00 nop.i 0x0;;
a0000001000f23f0: eb d1 00 36 00 21 [MMI] (p15) mov r26=r27;;
a0000001000f23f6: 90 09 68 5c 40 00 or r25=1,r26
a0000001000f23fc: 00 00 04 00 nop.i 0x0;;
a0000001000f2400: 02 68 44 32 8c 34 [MII] cmp4.ltu p13,p12=r17,r25
a0000001000f2406: 00 00 00 02 00 26 nop.i 0x0;;
a0000001000f240c: 12 c9 14 80 (p12) sub r17=r17,r25
a0000001000f2410: a2 89 44 22 05 20 [MII] (p13) sub r17=r17,r17
a0000001000f2416: 00 00 00 02 00 00 nop.i 0x0;;
a0000001000f241c: 00 00 04 00 nop.i 0x0
a0000001000f2420: 18 00 44 40 b0 11 [MMB] st4.rel [r32]=r17
a0000001000f2426: 00 88 7c 20 a3 03 st4 [r31]=r17
a0000001000f242c: d0 fe ff 4a (p07) br.cond.dptk.few a0000001000f22f0 <dequeue_task_fair+0x130>
a0000001000f2430: 10 00 00 00 01 00 [MIB] nop.m 0x0
a0000001000f2436: 00 00 00 02 00 00 nop.i 0x0
a0000001000f243c: 50 ff ff 48 br.few a0000001000f2380 <dequeue_task_fair+0x1c0>
a0000001000f2440: 09 00 00 00 01 00 [MMI] nop.m 0x0
a0000001000f2446: 10 01 48 20 20 00 ld4 r17=[r18]
a0000001000f244c: 00 00 04 00 nop.i 0x0;;
a0000001000f2450: 11 00 00 00 01 00 [MIB] nop.m 0x0
a0000001000f2456: 80 50 45 12 28 00 tbit.z p8,p9=r17,21
a0000001000f245c: 50 fe ff 48 br.few a0000001000f22a0 <dequeue_task_fair+0xe0>;;
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