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Message-ID: <20170907025212.GA18130@localhost.localdomain>
Date:   Thu, 7 Sep 2017 10:52:13 +0800
From:   Yu Chen <yu.c.chen@...el.com>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     x86@...nel.org, Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>, Rui Zhang <rui.zhang@...el.com>,
        LKML <linux-kernel@...r.kernel.org>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Len Brown <lenb@...nel.org>,
        Dan Williams <dan.j.williams@...el.com>,
        Christoph Hellwig <hch@....de>,
        Peter Zijlstra <peterz@...radead.org>
Subject: Re: [PATCH 4/4][RFC v2] x86/apic: Spread the vectors by choosing the
 idlest CPU

On Wed, Sep 06, 2017 at 10:03:58AM +0200, Thomas Gleixner wrote:
> On Wed, 6 Sep 2017, Yu Chen wrote:
> > On Wed, Sep 06, 2017 at 12:57:41AM +0200, Thomas Gleixner wrote:
> > > I have a hard time to figure out how the 133 vectors on CPU31 are now
> > > magically fitting in the empty space on CPU0, which is 204 - 133 = 71. In
> > > my limited understanding of math 133 is greater than 71, but your patch
> > > might make that magically be wrong.
> > >
> > The problem is reproduced when the network cable is not plugged in,
> > because this driver looks like this:
> > 
> > step 1. Reserved enough irq vectors and corresponding IRQs.
> > step 2. If the network is activated, invoke request_irq() to
> >         register the handler.
> > step 3. Invoke set_affinity() to spread the IRQs onto different
> >         CPUs, thus to spread the vectors too.
> > 
> > Here's my understanding for why spreading vectors might help for this
> > special case: 
> > As step 2 will not get invoked, the IRQs of this driver
> > has not been enabled, thus in migrate_one_irq() this IRQ
> > will not be considered because there is a check of
> > irqd_is_started(d), thus there should only be 8 vectors
> > allocated by this driver on CPU0, and 8 vectors left on
> > CPU31, and the 8 vectors on CPU31 will not be migrated
> > to CPU0 neither, so there is room for other 'valid' vectors
> > to be migrated to CPU0.
> 
> Can you please spare me repeating your theories, as long as you don't have
> hard facts to back them up? The network cable is changing the symptoms,
> but the underlying root cause is definitely something different.
> 
> > # cat /sys/kernel/debug/irq/domains/*
> > name:   VECTOR
> >  size:   0
> >  mapped: 388
> >  flags:  0x00000041
> 
> So we have 388 vectors mapped in total. And those are just device vectors
> because system vectors are not accounted there.
> 
> > name:   IO-APIC-0
> >  size:   24
> >  mapped: 16
> 
> That's the legacy space
> 
> > name:   IO-APIC-1
> >  size:   8
> >  mapped: 2
> 
> > name:   IO-APIC-2
> >  size:   8
> >  mapped: 0
> 
> > name:   IO-APIC-3
> >  size:   8
> >  mapped: 0
> 
> > name:   IO-APIC-4
> >  size:   8
> >  mapped: 5
> 
> And a few GSIs: Total GSIs = 16 + 2 + 5 = 23
> 
> > name:   PCI-MSI-2
> >  size:   0
> >  mapped: 365
> 
> Plus 365 PCI-MSI vectors allocated.
> 
> >  flags:  0x00000051
> >  parent: VECTOR
> >     name:   VECTOR
> >      size:   0
> >      mapped: 388
> 
> Which nicely sums up to 388
> 
> > # ls /sys/kernel/debug/irq/irqs
> > ls /sys/kernel/debug/irq/irqs
> > 0  10   11  13  142  184  217  259  292  31  33   337  339
> > 340  342  344  346  348  350  352  354  356  358  360  362
> > 364  366  368  370  372  374  376  378  380  382  384  386
> > 388  390  392  394  4  6   7  9  1  109  12  14  15   2
> > 24   26   3    32  335  338  34   341  343  345  347  349
> > 351  353  355  357  359  361  363  365  367  369  371  373
> > 375  377  379  381  383  385  387  389  391  393  395  5
> > 67  8
> 
> That are all interrupts which are active. That's a total of 89. Can you
> explain where the delta of 299 vectors comes from?
> 
> 299 allocated, vector mapped, but unused interrupts?
> 
> That's where your problem is, not in the vector spreading. You have a
> massive leak.
> 
> > BTW, do we have sysfs to display how much vectors used on each CPUs?
> 
> Not yet.
> 
> Can you please apply the debug patch below, boot the machine and right
> after login provide the output of
> 
> # cat /sys/kernel/debug/tracing/trace
>
Ok, I've tested on top of 4.13, here're the results:

# cat /sys/kernel/debug/tracing/trace

# tracer: nop
#
#                              _-----=> irqs-off
#                             / _----=> need-resched
#                            | / _---=> hardirq/softirq
#                            || / _--=> preempt-depth
#                            ||| /     delay
#           TASK-PID   CPU#  ||||    TIMESTAMP  FUNCTION
#              | |       |   ||||       |         |
     kworker/0:0-3     [000] ....     7.373461: msi_domain_alloc_irqs: dev: 0000:00:1c.0 nvec 1 virq 24
     kworker/0:0-3     [000] ....     7.373666: msi_domain_alloc_irqs: dev: 0000:b2:00.0 nvec 1 virq 26
     kworker/0:0-3     [000] ....     7.578980: msi_domain_alloc_irqs: dev: 0000:00:11.5 nvec 1 virq 31
     kworker/0:0-3     [000] ....     7.676938: msi_domain_alloc_irqs: dev: 0000:00:17.0 nvec 1 virq 32
     kworker/0:0-3     [000] ....     8.017664: msi_domain_alloc_irqs: dev: 0000:00:14.0 nvec 1 virq 33
     kworker/0:2-303   [000] ....     9.135467: msi_domain_alloc_irqs: dev: 0000:bb:00.0 nvec 1 virq 34
     kworker/0:2-303   [000] ....     9.135476: msi_domain_alloc_irqs: dev: 0000:bb:00.0 nvec 1 virq 35
     kworker/0:2-303   [000] ....     9.135484: msi_domain_alloc_irqs: dev: 0000:bb:00.0 nvec 1 virq 36
     kworker/0:2-303   [000] ....     9.135492: msi_domain_alloc_irqs: dev: 0000:bb:00.0 nvec 1 virq 37
     kworker/0:2-303   [000] ....     9.135499: msi_domain_alloc_irqs: dev: 0000:bb:00.0 nvec 1 virq 38
     kworker/0:2-303   [000] ....     9.135508: msi_domain_alloc_irqs: dev: 0000:bb:00.0 nvec 1 virq 39
     kworker/0:2-303   [000] ....     9.135516: msi_domain_alloc_irqs: dev: 0000:bb:00.0 nvec 1 virq 40
     kworker/0:2-303   [000] ....     9.135526: msi_domain_alloc_irqs: dev: 0000:bb:00.0 nvec 1 virq 41
     kworker/0:2-303   [000] ....     9.135534: msi_domain_alloc_irqs: dev: 0000:bb:00.0 nvec 1 virq 42
     kworker/0:2-303   [000] ....     9.135542: msi_domain_alloc_irqs: dev: 0000:bb:00.0 nvec 1 virq 43
     kworker/0:2-303   [000] ....     9.135550: msi_domain_alloc_irqs: dev: 0000:bb:00.0 nvec 1 virq 44
     kworker/0:2-303   [000] ....     9.135557: msi_domain_alloc_irqs: dev: 0000:bb:00.0 nvec 1 virq 45
     kworker/0:2-303   [000] ....     9.135564: msi_domain_alloc_irqs: dev: 0000:bb:00.0 nvec 1 virq 46
     kworker/0:2-303   [000] ....     9.135572: msi_domain_alloc_irqs: dev: 0000:bb:00.0 nvec 1 virq 47
     kworker/0:2-303   [000] ....     9.135579: msi_domain_alloc_irqs: dev: 0000:bb:00.0 nvec 1 virq 48
     kworker/0:2-303   [000] ....     9.135587: msi_domain_alloc_irqs: dev: 0000:bb:00.0 nvec 1 virq 49
     kworker/0:2-303   [000] ....     9.135594: msi_domain_alloc_irqs: dev: 0000:bb:00.0 nvec 1 virq 50
     kworker/0:2-303   [000] ....     9.135601: msi_domain_alloc_irqs: dev: 0000:bb:00.0 nvec 1 virq 51
     kworker/0:2-303   [000] ....     9.135608: msi_domain_alloc_irqs: dev: 0000:bb:00.0 nvec 1 virq 52
     kworker/0:2-303   [000] ....     9.135616: msi_domain_alloc_irqs: dev: 0000:bb:00.0 nvec 1 virq 53
     kworker/0:2-303   [000] ....     9.135623: msi_domain_alloc_irqs: dev: 0000:bb:00.0 nvec 1 virq 54
     kworker/0:2-303   [000] ....     9.135631: msi_domain_alloc_irqs: dev: 0000:bb:00.0 nvec 1 virq 55
     kworker/0:2-303   [000] ....     9.135638: msi_domain_alloc_irqs: dev: 0000:bb:00.0 nvec 1 virq 56
     kworker/0:2-303   [000] ....     9.135645: msi_domain_alloc_irqs: dev: 0000:bb:00.0 nvec 1 virq 57
     kworker/0:2-303   [000] ....     9.135653: msi_domain_alloc_irqs: dev: 0000:bb:00.0 nvec 1 virq 58
     kworker/0:2-303   [000] ....     9.135660: msi_domain_alloc_irqs: dev: 0000:bb:00.0 nvec 1 virq 59
     kworker/0:2-303   [000] ....     9.135668: msi_domain_alloc_irqs: dev: 0000:bb:00.0 nvec 1 virq 60
     kworker/0:2-303   [000] ....     9.135676: msi_domain_alloc_irqs: dev: 0000:bb:00.0 nvec 1 virq 61
     kworker/0:2-303   [000] ....     9.135683: msi_domain_alloc_irqs: dev: 0000:bb:00.0 nvec 1 virq 62
     kworker/0:2-303   [000] ....     9.135691: msi_domain_alloc_irqs: dev: 0000:bb:00.0 nvec 1 virq 63
     kworker/0:2-303   [000] ....     9.135699: msi_domain_alloc_irqs: dev: 0000:bb:00.0 nvec 1 virq 64
     kworker/0:2-303   [000] ....     9.135707: msi_domain_alloc_irqs: dev: 0000:bb:00.0 nvec 1 virq 65
     kworker/0:2-303   [000] ....     9.135714: msi_domain_alloc_irqs: dev: 0000:bb:00.0 nvec 1 virq 66
     kworker/0:2-303   [000] ....     9.135721: msi_domain_alloc_irqs: dev: 0000:bb:00.0 nvec 1 virq 67
     kworker/0:2-303   [000] ....     9.135729: msi_domain_alloc_irqs: dev: 0000:bb:00.0 nvec 1 virq 68
     kworker/0:2-303   [000] ....     9.135736: msi_domain_alloc_irqs: dev: 0000:bb:00.0 nvec 1 virq 69
     kworker/0:2-303   [000] ....     9.135744: msi_domain_alloc_irqs: dev: 0000:bb:00.0 nvec 1 virq 70
     kworker/0:2-303   [000] ....     9.135751: msi_domain_alloc_irqs: dev: 0000:bb:00.0 nvec 1 virq 71
     kworker/0:2-303   [000] ....     9.135758: msi_domain_alloc_irqs: dev: 0000:bb:00.0 nvec 1 virq 72
     kworker/0:2-303   [000] ....     9.135766: msi_domain_alloc_irqs: dev: 0000:bb:00.0 nvec 1 virq 73
     kworker/0:2-303   [000] ....     9.135773: msi_domain_alloc_irqs: dev: 0000:bb:00.0 nvec 1 virq 74
     kworker/0:2-303   [000] ....     9.135780: msi_domain_alloc_irqs: dev: 0000:bb:00.0 nvec 1 virq 75
     kworker/0:2-303   [000] ....     9.135788: msi_domain_alloc_irqs: dev: 0000:bb:00.0 nvec 1 virq 76
     kworker/0:2-303   [000] ....     9.135795: msi_domain_alloc_irqs: dev: 0000:bb:00.0 nvec 1 virq 77
     kworker/0:2-303   [000] ....     9.135803: msi_domain_alloc_irqs: dev: 0000:bb:00.0 nvec 1 virq 78
     kworker/0:2-303   [000] ....     9.135810: msi_domain_alloc_irqs: dev: 0000:bb:00.0 nvec 1 virq 79
     kworker/0:2-303   [000] ....     9.135818: msi_domain_alloc_irqs: dev: 0000:bb:00.0 nvec 1 virq 80
     kworker/0:2-303   [000] ....     9.135826: msi_domain_alloc_irqs: dev: 0000:bb:00.0 nvec 1 virq 81
     kworker/0:2-303   [000] ....     9.135833: msi_domain_alloc_irqs: dev: 0000:bb:00.0 nvec 1 virq 82
     kworker/0:2-303   [000] ....     9.135841: msi_domain_alloc_irqs: dev: 0000:bb:00.0 nvec 1 virq 83
     kworker/0:2-303   [000] ....     9.135848: msi_domain_alloc_irqs: dev: 0000:bb:00.0 nvec 1 virq 84
     kworker/0:2-303   [000] ....     9.135856: msi_domain_alloc_irqs: dev: 0000:bb:00.0 nvec 1 virq 85
     kworker/0:2-303   [000] ....     9.135863: msi_domain_alloc_irqs: dev: 0000:bb:00.0 nvec 1 virq 86
     kworker/0:2-303   [000] ....     9.135871: msi_domain_alloc_irqs: dev: 0000:bb:00.0 nvec 1 virq 87
     kworker/0:2-303   [000] ....     9.135878: msi_domain_alloc_irqs: dev: 0000:bb:00.0 nvec 1 virq 88
     kworker/0:2-303   [000] ....     9.135885: msi_domain_alloc_irqs: dev: 0000:bb:00.0 nvec 1 virq 89
     kworker/0:2-303   [000] ....     9.135893: msi_domain_alloc_irqs: dev: 0000:bb:00.0 nvec 1 virq 90
     kworker/0:2-303   [000] ....     9.135900: msi_domain_alloc_irqs: dev: 0000:bb:00.0 nvec 1 virq 91
     kworker/0:2-303   [000] ....     9.135908: msi_domain_alloc_irqs: dev: 0000:bb:00.0 nvec 1 virq 92
     kworker/0:2-303   [000] ....     9.135915: msi_domain_alloc_irqs: dev: 0000:bb:00.0 nvec 1 virq 93
     kworker/0:2-303   [000] ....     9.135923: msi_domain_alloc_irqs: dev: 0000:bb:00.0 nvec 1 virq 94
     kworker/0:2-303   [000] ....     9.135930: msi_domain_alloc_irqs: dev: 0000:bb:00.0 nvec 1 virq 95
     kworker/0:2-303   [000] ....     9.135937: msi_domain_alloc_irqs: dev: 0000:bb:00.0 nvec 1 virq 96
     kworker/0:2-303   [000] ....     9.135944: msi_domain_alloc_irqs: dev: 0000:bb:00.0 nvec 1 virq 97
     kworker/0:2-303   [000] ....     9.135951: msi_domain_alloc_irqs: dev: 0000:bb:00.0 nvec 1 virq 98
     kworker/0:2-303   [000] ....     9.135958: msi_domain_alloc_irqs: dev: 0000:bb:00.0 nvec 1 virq 99
     kworker/0:2-303   [000] ....     9.135964: msi_domain_alloc_irqs: dev: 0000:bb:00.0 nvec 1 virq 100
     kworker/0:2-303   [000] ....     9.135971: msi_domain_alloc_irqs: dev: 0000:bb:00.0 nvec 1 virq 101
     kworker/0:2-303   [000] ....     9.135978: msi_domain_alloc_irqs: dev: 0000:bb:00.0 nvec 1 virq 102
     kworker/0:2-303   [000] ....     9.135985: msi_domain_alloc_irqs: dev: 0000:bb:00.0 nvec 1 virq 103
     kworker/0:2-303   [000] ....     9.135991: msi_domain_alloc_irqs: dev: 0000:bb:00.0 nvec 1 virq 104
     kworker/0:2-303   [000] ....     9.135998: msi_domain_alloc_irqs: dev: 0000:bb:00.0 nvec 1 virq 105
     kworker/0:2-303   [000] ....     9.136005: msi_domain_alloc_irqs: dev: 0000:bb:00.0 nvec 1 virq 106
     kworker/0:2-303   [000] ....     9.136012: msi_domain_alloc_irqs: dev: 0000:bb:00.0 nvec 1 virq 107
     kworker/0:2-303   [000] ....     9.136019: msi_domain_alloc_irqs: dev: 0000:bb:00.0 nvec 1 virq 108
     kworker/0:2-303   [000] ....     9.599173: msi_domain_alloc_irqs: dev: 0000:bb:00.1 nvec 1 virq 109
     kworker/0:2-303   [000] ....     9.599181: msi_domain_alloc_irqs: dev: 0000:bb:00.1 nvec 1 virq 110
     kworker/0:2-303   [000] ....     9.599189: msi_domain_alloc_irqs: dev: 0000:bb:00.1 nvec 1 virq 111
     kworker/0:2-303   [000] ....     9.599196: msi_domain_alloc_irqs: dev: 0000:bb:00.1 nvec 1 virq 112
     kworker/0:2-303   [000] ....     9.599203: msi_domain_alloc_irqs: dev: 0000:bb:00.1 nvec 1 virq 113
     kworker/0:2-303   [000] ....     9.599210: msi_domain_alloc_irqs: dev: 0000:bb:00.1 nvec 1 virq 114
     kworker/0:2-303   [000] ....     9.599217: msi_domain_alloc_irqs: dev: 0000:bb:00.1 nvec 1 virq 115
     kworker/0:2-303   [000] ....     9.599224: msi_domain_alloc_irqs: dev: 0000:bb:00.1 nvec 1 virq 116
     kworker/0:2-303   [000] ....     9.599231: msi_domain_alloc_irqs: dev: 0000:bb:00.1 nvec 1 virq 117
     kworker/0:2-303   [000] ....     9.599239: msi_domain_alloc_irqs: dev: 0000:bb:00.1 nvec 1 virq 118
     kworker/0:2-303   [000] ....     9.599246: msi_domain_alloc_irqs: dev: 0000:bb:00.1 nvec 1 virq 119
     kworker/0:2-303   [000] ....     9.599253: msi_domain_alloc_irqs: dev: 0000:bb:00.1 nvec 1 virq 120
     kworker/0:2-303   [000] ....     9.599259: msi_domain_alloc_irqs: dev: 0000:bb:00.1 nvec 1 virq 121
     kworker/0:2-303   [000] ....     9.599266: msi_domain_alloc_irqs: dev: 0000:bb:00.1 nvec 1 virq 122
     kworker/0:2-303   [000] ....     9.599273: msi_domain_alloc_irqs: dev: 0000:bb:00.1 nvec 1 virq 123
     kworker/0:2-303   [000] ....     9.599279: msi_domain_alloc_irqs: dev: 0000:bb:00.1 nvec 1 virq 124
     kworker/0:2-303   [000] ....     9.599286: msi_domain_alloc_irqs: dev: 0000:bb:00.1 nvec 1 virq 125
     kworker/0:2-303   [000] ....     9.599293: msi_domain_alloc_irqs: dev: 0000:bb:00.1 nvec 1 virq 126
     kworker/0:2-303   [000] ....     9.599300: msi_domain_alloc_irqs: dev: 0000:bb:00.1 nvec 1 virq 127
     kworker/0:2-303   [000] ....     9.599307: msi_domain_alloc_irqs: dev: 0000:bb:00.1 nvec 1 virq 128
     kworker/0:2-303   [000] ....     9.599314: msi_domain_alloc_irqs: dev: 0000:bb:00.1 nvec 1 virq 129
     kworker/0:2-303   [000] ....     9.599321: msi_domain_alloc_irqs: dev: 0000:bb:00.1 nvec 1 virq 130
     kworker/0:2-303   [000] ....     9.599327: msi_domain_alloc_irqs: dev: 0000:bb:00.1 nvec 1 virq 131
     kworker/0:2-303   [000] ....     9.599334: msi_domain_alloc_irqs: dev: 0000:bb:00.1 nvec 1 virq 132
     kworker/0:2-303   [000] ....     9.599341: msi_domain_alloc_irqs: dev: 0000:bb:00.1 nvec 1 virq 133
     kworker/0:2-303   [000] ....     9.599349: msi_domain_alloc_irqs: dev: 0000:bb:00.1 nvec 1 virq 134
     kworker/0:2-303   [000] ....     9.599356: msi_domain_alloc_irqs: dev: 0000:bb:00.1 nvec 1 virq 135
     kworker/0:2-303   [000] ....     9.599363: msi_domain_alloc_irqs: dev: 0000:bb:00.1 nvec 1 virq 136
     kworker/0:2-303   [000] ....     9.599369: msi_domain_alloc_irqs: dev: 0000:bb:00.1 nvec 1 virq 137
     kworker/0:2-303   [000] ....     9.599376: msi_domain_alloc_irqs: dev: 0000:bb:00.1 nvec 1 virq 138
     kworker/0:2-303   [000] ....     9.599382: msi_domain_alloc_irqs: dev: 0000:bb:00.1 nvec 1 virq 139
     kworker/0:2-303   [000] ....     9.599389: msi_domain_alloc_irqs: dev: 0000:bb:00.1 nvec 1 virq 140
     kworker/0:2-303   [000] ....     9.599395: msi_domain_alloc_irqs: dev: 0000:bb:00.1 nvec 1 virq 141
     kworker/0:2-303   [000] ....     9.599402: msi_domain_alloc_irqs: dev: 0000:bb:00.1 nvec 1 virq 142
     kworker/0:2-303   [000] ....     9.599409: msi_domain_alloc_irqs: dev: 0000:bb:00.1 nvec 1 virq 143
     kworker/0:2-303   [000] ....     9.599416: msi_domain_alloc_irqs: dev: 0000:bb:00.1 nvec 1 virq 144
     kworker/0:2-303   [000] ....     9.599422: msi_domain_alloc_irqs: dev: 0000:bb:00.1 nvec 1 virq 145
     kworker/0:2-303   [000] ....     9.599428: msi_domain_alloc_irqs: dev: 0000:bb:00.1 nvec 1 virq 146
     kworker/0:2-303   [000] ....     9.599437: msi_domain_alloc_irqs: dev: 0000:bb:00.1 nvec 1 virq 147
     kworker/0:2-303   [000] ....     9.599444: msi_domain_alloc_irqs: dev: 0000:bb:00.1 nvec 1 virq 148
     kworker/0:2-303   [000] ....     9.599450: msi_domain_alloc_irqs: dev: 0000:bb:00.1 nvec 1 virq 149
     kworker/0:2-303   [000] ....     9.599456: msi_domain_alloc_irqs: dev: 0000:bb:00.1 nvec 1 virq 150
     kworker/0:2-303   [000] ....     9.599463: msi_domain_alloc_irqs: dev: 0000:bb:00.1 nvec 1 virq 151
     kworker/0:2-303   [000] ....     9.599470: msi_domain_alloc_irqs: dev: 0000:bb:00.1 nvec 1 virq 152
     kworker/0:2-303   [000] ....     9.599476: msi_domain_alloc_irqs: dev: 0000:bb:00.1 nvec 1 virq 153
     kworker/0:2-303   [000] ....     9.599482: msi_domain_alloc_irqs: dev: 0000:bb:00.1 nvec 1 virq 154
     kworker/0:2-303   [000] ....     9.599488: msi_domain_alloc_irqs: dev: 0000:bb:00.1 nvec 1 virq 155
     kworker/0:2-303   [000] ....     9.599494: msi_domain_alloc_irqs: dev: 0000:bb:00.1 nvec 1 virq 156
     kworker/0:2-303   [000] ....     9.599501: msi_domain_alloc_irqs: dev: 0000:bb:00.1 nvec 1 virq 157
     kworker/0:2-303   [000] ....     9.599507: msi_domain_alloc_irqs: dev: 0000:bb:00.1 nvec 1 virq 158
     kworker/0:2-303   [000] ....     9.599513: msi_domain_alloc_irqs: dev: 0000:bb:00.1 nvec 1 virq 159
     kworker/0:2-303   [000] ....     9.599519: msi_domain_alloc_irqs: dev: 0000:bb:00.1 nvec 1 virq 160
     kworker/0:2-303   [000] ....     9.599527: msi_domain_alloc_irqs: dev: 0000:bb:00.1 nvec 1 virq 161
     kworker/0:2-303   [000] ....     9.599534: msi_domain_alloc_irqs: dev: 0000:bb:00.1 nvec 1 virq 162
     kworker/0:2-303   [000] ....     9.599541: msi_domain_alloc_irqs: dev: 0000:bb:00.1 nvec 1 virq 163
     kworker/0:2-303   [000] ....     9.599547: msi_domain_alloc_irqs: dev: 0000:bb:00.1 nvec 1 virq 164
     kworker/0:2-303   [000] ....     9.599553: msi_domain_alloc_irqs: dev: 0000:bb:00.1 nvec 1 virq 165
     kworker/0:2-303   [000] ....     9.599560: msi_domain_alloc_irqs: dev: 0000:bb:00.1 nvec 1 virq 166
     kworker/0:2-303   [000] ....     9.599567: msi_domain_alloc_irqs: dev: 0000:bb:00.1 nvec 1 virq 167
     kworker/0:2-303   [000] ....     9.599573: msi_domain_alloc_irqs: dev: 0000:bb:00.1 nvec 1 virq 168
     kworker/0:2-303   [000] ....     9.599579: msi_domain_alloc_irqs: dev: 0000:bb:00.1 nvec 1 virq 169
     kworker/0:2-303   [000] ....     9.599585: msi_domain_alloc_irqs: dev: 0000:bb:00.1 nvec 1 virq 170
     kworker/0:2-303   [000] ....     9.599591: msi_domain_alloc_irqs: dev: 0000:bb:00.1 nvec 1 virq 171
     kworker/0:2-303   [000] ....     9.599597: msi_domain_alloc_irqs: dev: 0000:bb:00.1 nvec 1 virq 172
     kworker/0:2-303   [000] ....     9.599604: msi_domain_alloc_irqs: dev: 0000:bb:00.1 nvec 1 virq 173
     kworker/0:2-303   [000] ....     9.599610: msi_domain_alloc_irqs: dev: 0000:bb:00.1 nvec 1 virq 174
     kworker/0:2-303   [000] ....     9.599616: msi_domain_alloc_irqs: dev: 0000:bb:00.1 nvec 1 virq 175
     kworker/0:2-303   [000] ....     9.599622: msi_domain_alloc_irqs: dev: 0000:bb:00.1 nvec 1 virq 176
     kworker/0:2-303   [000] ....     9.599628: msi_domain_alloc_irqs: dev: 0000:bb:00.1 nvec 1 virq 177
     kworker/0:2-303   [000] ....     9.599634: msi_domain_alloc_irqs: dev: 0000:bb:00.1 nvec 1 virq 178
     kworker/0:2-303   [000] ....     9.599640: msi_domain_alloc_irqs: dev: 0000:bb:00.1 nvec 1 virq 179
     kworker/0:2-303   [000] ....     9.599646: msi_domain_alloc_irqs: dev: 0000:bb:00.1 nvec 1 virq 180
     kworker/0:2-303   [000] ....     9.599653: msi_domain_alloc_irqs: dev: 0000:bb:00.1 nvec 1 virq 181
     kworker/0:2-303   [000] ....     9.599660: msi_domain_alloc_irqs: dev: 0000:bb:00.1 nvec 1 virq 182
     kworker/0:2-303   [000] ....     9.599666: msi_domain_alloc_irqs: dev: 0000:bb:00.1 nvec 1 virq 183
     kworker/0:2-303   [000] ....     9.699902: msi_domain_alloc_irqs: dev: 0000:bb:00.2 nvec 1 virq 184
     kworker/0:2-303   [000] ....     9.699910: msi_domain_alloc_irqs: dev: 0000:bb:00.2 nvec 1 virq 185
     kworker/0:2-303   [000] ....     9.699917: msi_domain_alloc_irqs: dev: 0000:bb:00.2 nvec 1 virq 186
     kworker/0:2-303   [000] ....     9.699924: msi_domain_alloc_irqs: dev: 0000:bb:00.2 nvec 1 virq 187
     kworker/0:2-303   [000] ....     9.699931: msi_domain_alloc_irqs: dev: 0000:bb:00.2 nvec 1 virq 188
     kworker/0:2-303   [000] ....     9.699939: msi_domain_alloc_irqs: dev: 0000:bb:00.2 nvec 1 virq 189
     kworker/0:2-303   [000] ....     9.699946: msi_domain_alloc_irqs: dev: 0000:bb:00.2 nvec 1 virq 190
     kworker/0:2-303   [000] ....     9.699953: msi_domain_alloc_irqs: dev: 0000:bb:00.2 nvec 1 virq 191
     kworker/0:2-303   [000] ....     9.699960: msi_domain_alloc_irqs: dev: 0000:bb:00.2 nvec 1 virq 192
     kworker/0:2-303   [000] ....     9.699967: msi_domain_alloc_irqs: dev: 0000:bb:00.2 nvec 1 virq 193
     kworker/0:2-303   [000] ....     9.699975: msi_domain_alloc_irqs: dev: 0000:bb:00.2 nvec 1 virq 194
     kworker/0:2-303   [000] ....     9.699983: msi_domain_alloc_irqs: dev: 0000:bb:00.2 nvec 1 virq 195
     kworker/0:2-303   [000] ....     9.699989: msi_domain_alloc_irqs: dev: 0000:bb:00.2 nvec 1 virq 196
     kworker/0:2-303   [000] ....     9.699996: msi_domain_alloc_irqs: dev: 0000:bb:00.2 nvec 1 virq 197
     kworker/0:2-303   [000] ....     9.700003: msi_domain_alloc_irqs: dev: 0000:bb:00.2 nvec 1 virq 198
     kworker/0:2-303   [000] ....     9.700012: msi_domain_alloc_irqs: dev: 0000:bb:00.2 nvec 1 virq 199
     kworker/0:2-303   [000] ....     9.700019: msi_domain_alloc_irqs: dev: 0000:bb:00.2 nvec 1 virq 200
     kworker/0:2-303   [000] ....     9.700026: msi_domain_alloc_irqs: dev: 0000:bb:00.2 nvec 1 virq 201
     kworker/0:2-303   [000] ....     9.700032: msi_domain_alloc_irqs: dev: 0000:bb:00.2 nvec 1 virq 202
     kworker/0:2-303   [000] ....     9.700039: msi_domain_alloc_irqs: dev: 0000:bb:00.2 nvec 1 virq 203
     kworker/0:2-303   [000] ....     9.700047: msi_domain_alloc_irqs: dev: 0000:bb:00.2 nvec 1 virq 204
     kworker/0:2-303   [000] ....     9.700053: msi_domain_alloc_irqs: dev: 0000:bb:00.2 nvec 1 virq 205
     kworker/0:2-303   [000] ....     9.700060: msi_domain_alloc_irqs: dev: 0000:bb:00.2 nvec 1 virq 206
     kworker/0:2-303   [000] ....     9.700067: msi_domain_alloc_irqs: dev: 0000:bb:00.2 nvec 1 virq 207
     kworker/0:2-303   [000] ....     9.700074: msi_domain_alloc_irqs: dev: 0000:bb:00.2 nvec 1 virq 208
     kworker/0:2-303   [000] ....     9.700081: msi_domain_alloc_irqs: dev: 0000:bb:00.2 nvec 1 virq 209
     kworker/0:2-303   [000] ....     9.700088: msi_domain_alloc_irqs: dev: 0000:bb:00.2 nvec 1 virq 210
     kworker/0:2-303   [000] ....     9.700095: msi_domain_alloc_irqs: dev: 0000:bb:00.2 nvec 1 virq 211
     kworker/0:2-303   [000] ....     9.700103: msi_domain_alloc_irqs: dev: 0000:bb:00.2 nvec 1 virq 212
     kworker/0:2-303   [000] ....     9.700112: msi_domain_alloc_irqs: dev: 0000:bb:00.2 nvec 1 virq 213
     kworker/0:2-303   [000] ....     9.700121: msi_domain_alloc_irqs: dev: 0000:bb:00.2 nvec 1 virq 214
     kworker/0:2-303   [000] ....     9.700129: msi_domain_alloc_irqs: dev: 0000:bb:00.2 nvec 1 virq 215
     kworker/0:2-303   [000] ....     9.700137: msi_domain_alloc_irqs: dev: 0000:bb:00.2 nvec 1 virq 216
     kworker/0:2-303   [000] ....     9.700145: msi_domain_alloc_irqs: dev: 0000:bb:00.2 nvec 1 virq 217
     kworker/0:2-303   [000] ....     9.700154: msi_domain_alloc_irqs: dev: 0000:bb:00.2 nvec 1 virq 218
     kworker/0:2-303   [000] ....     9.700163: msi_domain_alloc_irqs: dev: 0000:bb:00.2 nvec 1 virq 219
     kworker/0:2-303   [000] ....     9.700172: msi_domain_alloc_irqs: dev: 0000:bb:00.2 nvec 1 virq 220
     kworker/0:2-303   [000] ....     9.700180: msi_domain_alloc_irqs: dev: 0000:bb:00.2 nvec 1 virq 221
     kworker/0:2-303   [000] ....     9.700189: msi_domain_alloc_irqs: dev: 0000:bb:00.2 nvec 1 virq 222
     kworker/0:2-303   [000] ....     9.700200: msi_domain_alloc_irqs: dev: 0000:bb:00.2 nvec 1 virq 223
     kworker/0:2-303   [000] ....     9.700209: msi_domain_alloc_irqs: dev: 0000:bb:00.2 nvec 1 virq 224
     kworker/0:2-303   [000] ....     9.700217: msi_domain_alloc_irqs: dev: 0000:bb:00.2 nvec 1 virq 225
     kworker/0:2-303   [000] ....     9.700225: msi_domain_alloc_irqs: dev: 0000:bb:00.2 nvec 1 virq 226
     kworker/0:2-303   [000] ....     9.700235: msi_domain_alloc_irqs: dev: 0000:bb:00.2 nvec 1 virq 227
     kworker/0:2-303   [000] ....     9.700244: msi_domain_alloc_irqs: dev: 0000:bb:00.2 nvec 1 virq 228
     kworker/0:2-303   [000] ....     9.700253: msi_domain_alloc_irqs: dev: 0000:bb:00.2 nvec 1 virq 229
     kworker/0:2-303   [000] ....     9.700261: msi_domain_alloc_irqs: dev: 0000:bb:00.2 nvec 1 virq 230
     kworker/0:2-303   [000] ....     9.700269: msi_domain_alloc_irqs: dev: 0000:bb:00.2 nvec 1 virq 231
     kworker/0:2-303   [000] ....     9.700278: msi_domain_alloc_irqs: dev: 0000:bb:00.2 nvec 1 virq 232
     kworker/0:2-303   [000] ....     9.700287: msi_domain_alloc_irqs: dev: 0000:bb:00.2 nvec 1 virq 233
     kworker/0:2-303   [000] ....     9.700295: msi_domain_alloc_irqs: dev: 0000:bb:00.2 nvec 1 virq 234
     kworker/0:2-303   [000] ....     9.700304: msi_domain_alloc_irqs: dev: 0000:bb:00.2 nvec 1 virq 235
     kworker/0:2-303   [000] ....     9.700313: msi_domain_alloc_irqs: dev: 0000:bb:00.2 nvec 1 virq 236
     kworker/0:2-303   [000] ....     9.700321: msi_domain_alloc_irqs: dev: 0000:bb:00.2 nvec 1 virq 237
     kworker/0:2-303   [000] ....     9.700330: msi_domain_alloc_irqs: dev: 0000:bb:00.2 nvec 1 virq 238
     kworker/0:2-303   [000] ....     9.700339: msi_domain_alloc_irqs: dev: 0000:bb:00.2 nvec 1 virq 239
     kworker/0:2-303   [000] ....     9.700347: msi_domain_alloc_irqs: dev: 0000:bb:00.2 nvec 1 virq 240
     kworker/0:2-303   [000] ....     9.700355: msi_domain_alloc_irqs: dev: 0000:bb:00.2 nvec 1 virq 241
     kworker/0:2-303   [000] ....     9.700363: msi_domain_alloc_irqs: dev: 0000:bb:00.2 nvec 1 virq 242
     kworker/0:2-303   [000] ....     9.700372: msi_domain_alloc_irqs: dev: 0000:bb:00.2 nvec 1 virq 243
     kworker/0:2-303   [000] ....     9.700380: msi_domain_alloc_irqs: dev: 0000:bb:00.2 nvec 1 virq 244
     kworker/0:2-303   [000] ....     9.700390: msi_domain_alloc_irqs: dev: 0000:bb:00.2 nvec 1 virq 245
     kworker/0:2-303   [000] ....     9.700398: msi_domain_alloc_irqs: dev: 0000:bb:00.2 nvec 1 virq 246
     kworker/0:2-303   [000] ....     9.700406: msi_domain_alloc_irqs: dev: 0000:bb:00.2 nvec 1 virq 247
     kworker/0:2-303   [000] ....     9.700415: msi_domain_alloc_irqs: dev: 0000:bb:00.2 nvec 1 virq 248
     kworker/0:2-303   [000] ....     9.700424: msi_domain_alloc_irqs: dev: 0000:bb:00.2 nvec 1 virq 249
     kworker/0:2-303   [000] ....     9.700432: msi_domain_alloc_irqs: dev: 0000:bb:00.2 nvec 1 virq 250
     kworker/0:2-303   [000] ....     9.700440: msi_domain_alloc_irqs: dev: 0000:bb:00.2 nvec 1 virq 251
     kworker/0:2-303   [000] ....     9.700449: msi_domain_alloc_irqs: dev: 0000:bb:00.2 nvec 1 virq 252
     kworker/0:2-303   [000] ....     9.700458: msi_domain_alloc_irqs: dev: 0000:bb:00.2 nvec 1 virq 253
     kworker/0:2-303   [000] ....     9.700466: msi_domain_alloc_irqs: dev: 0000:bb:00.2 nvec 1 virq 254
     kworker/0:2-303   [000] ....     9.700474: msi_domain_alloc_irqs: dev: 0000:bb:00.2 nvec 1 virq 255
     kworker/0:2-303   [000] ....     9.700483: msi_domain_alloc_irqs: dev: 0000:bb:00.2 nvec 1 virq 256
     kworker/0:2-303   [000] ....     9.700492: msi_domain_alloc_irqs: dev: 0000:bb:00.2 nvec 1 virq 257
     kworker/0:2-303   [000] ....     9.700500: msi_domain_alloc_irqs: dev: 0000:bb:00.2 nvec 1 virq 258
     kworker/0:2-303   [000] ....     9.761556: msi_domain_alloc_irqs: dev: 0000:bb:00.3 nvec 1 virq 259
     kworker/0:2-303   [000] ....     9.761570: msi_domain_alloc_irqs: dev: 0000:bb:00.3 nvec 1 virq 260
     kworker/0:2-303   [000] ....     9.761583: msi_domain_alloc_irqs: dev: 0000:bb:00.3 nvec 1 virq 261
     kworker/0:2-303   [000] ....     9.761595: msi_domain_alloc_irqs: dev: 0000:bb:00.3 nvec 1 virq 262
     kworker/0:2-303   [000] ....     9.761608: msi_domain_alloc_irqs: dev: 0000:bb:00.3 nvec 1 virq 263
     kworker/0:2-303   [000] ....     9.761619: msi_domain_alloc_irqs: dev: 0000:bb:00.3 nvec 1 virq 264
     kworker/0:2-303   [000] ....     9.761629: msi_domain_alloc_irqs: dev: 0000:bb:00.3 nvec 1 virq 265
     kworker/0:2-303   [000] ....     9.761639: msi_domain_alloc_irqs: dev: 0000:bb:00.3 nvec 1 virq 266
     kworker/0:2-303   [000] ....     9.761649: msi_domain_alloc_irqs: dev: 0000:bb:00.3 nvec 1 virq 267
     kworker/0:2-303   [000] ....     9.761658: msi_domain_alloc_irqs: dev: 0000:bb:00.3 nvec 1 virq 268
     kworker/0:2-303   [000] ....     9.761669: msi_domain_alloc_irqs: dev: 0000:bb:00.3 nvec 1 virq 269
     kworker/0:2-303   [000] ....     9.761678: msi_domain_alloc_irqs: dev: 0000:bb:00.3 nvec 1 virq 270
     kworker/0:2-303   [000] ....     9.761688: msi_domain_alloc_irqs: dev: 0000:bb:00.3 nvec 1 virq 271
     kworker/0:2-303   [000] ....     9.761697: msi_domain_alloc_irqs: dev: 0000:bb:00.3 nvec 1 virq 272
     kworker/0:2-303   [000] ....     9.761707: msi_domain_alloc_irqs: dev: 0000:bb:00.3 nvec 1 virq 273
     kworker/0:2-303   [000] ....     9.761717: msi_domain_alloc_irqs: dev: 0000:bb:00.3 nvec 1 virq 274
     kworker/0:2-303   [000] ....     9.761726: msi_domain_alloc_irqs: dev: 0000:bb:00.3 nvec 1 virq 275
     kworker/0:2-303   [000] ....     9.761736: msi_domain_alloc_irqs: dev: 0000:bb:00.3 nvec 1 virq 276
     kworker/0:2-303   [000] ....     9.761745: msi_domain_alloc_irqs: dev: 0000:bb:00.3 nvec 1 virq 277
     kworker/0:2-303   [000] ....     9.761756: msi_domain_alloc_irqs: dev: 0000:bb:00.3 nvec 1 virq 278
     kworker/0:2-303   [000] ....     9.761765: msi_domain_alloc_irqs: dev: 0000:bb:00.3 nvec 1 virq 279
     kworker/0:2-303   [000] ....     9.761775: msi_domain_alloc_irqs: dev: 0000:bb:00.3 nvec 1 virq 280
     kworker/0:2-303   [000] ....     9.761784: msi_domain_alloc_irqs: dev: 0000:bb:00.3 nvec 1 virq 281
     kworker/0:2-303   [000] ....     9.761793: msi_domain_alloc_irqs: dev: 0000:bb:00.3 nvec 1 virq 282
     kworker/0:2-303   [000] ....     9.761803: msi_domain_alloc_irqs: dev: 0000:bb:00.3 nvec 1 virq 283
     kworker/0:2-303   [000] ....     9.761812: msi_domain_alloc_irqs: dev: 0000:bb:00.3 nvec 1 virq 284
     kworker/0:2-303   [000] ....     9.761822: msi_domain_alloc_irqs: dev: 0000:bb:00.3 nvec 1 virq 285
     kworker/0:2-303   [000] ....     9.761831: msi_domain_alloc_irqs: dev: 0000:bb:00.3 nvec 1 virq 286
     kworker/0:2-303   [000] ....     9.761840: msi_domain_alloc_irqs: dev: 0000:bb:00.3 nvec 1 virq 287
     kworker/0:2-303   [000] ....     9.761854: msi_domain_alloc_irqs: dev: 0000:bb:00.3 nvec 1 virq 288
     kworker/0:2-303   [000] ....     9.761863: msi_domain_alloc_irqs: dev: 0000:bb:00.3 nvec 1 virq 289
     kworker/0:2-303   [000] ....     9.761872: msi_domain_alloc_irqs: dev: 0000:bb:00.3 nvec 1 virq 290
     kworker/0:2-303   [000] ....     9.761881: msi_domain_alloc_irqs: dev: 0000:bb:00.3 nvec 1 virq 291
     kworker/0:2-303   [000] ....     9.761892: msi_domain_alloc_irqs: dev: 0000:bb:00.3 nvec 1 virq 292
     kworker/0:2-303   [000] ....     9.761903: msi_domain_alloc_irqs: dev: 0000:bb:00.3 nvec 1 virq 293
     kworker/0:2-303   [000] ....     9.761913: msi_domain_alloc_irqs: dev: 0000:bb:00.3 nvec 1 virq 294
     kworker/0:2-303   [000] ....     9.761923: msi_domain_alloc_irqs: dev: 0000:bb:00.3 nvec 1 virq 295
     kworker/0:2-303   [000] ....     9.761932: msi_domain_alloc_irqs: dev: 0000:bb:00.3 nvec 1 virq 296
     kworker/0:2-303   [000] ....     9.761941: msi_domain_alloc_irqs: dev: 0000:bb:00.3 nvec 1 virq 297
     kworker/0:2-303   [000] ....     9.761951: msi_domain_alloc_irqs: dev: 0000:bb:00.3 nvec 1 virq 298
     kworker/0:2-303   [000] ....     9.761961: msi_domain_alloc_irqs: dev: 0000:bb:00.3 nvec 1 virq 299
     kworker/0:2-303   [000] ....     9.761970: msi_domain_alloc_irqs: dev: 0000:bb:00.3 nvec 1 virq 300
     kworker/0:2-303   [000] ....     9.761979: msi_domain_alloc_irqs: dev: 0000:bb:00.3 nvec 1 virq 301
     kworker/0:2-303   [000] ....     9.761988: msi_domain_alloc_irqs: dev: 0000:bb:00.3 nvec 1 virq 302
     kworker/0:2-303   [000] ....     9.761998: msi_domain_alloc_irqs: dev: 0000:bb:00.3 nvec 1 virq 303
     kworker/0:2-303   [000] ....     9.762008: msi_domain_alloc_irqs: dev: 0000:bb:00.3 nvec 1 virq 304
     kworker/0:2-303   [000] ....     9.762017: msi_domain_alloc_irqs: dev: 0000:bb:00.3 nvec 1 virq 305
     kworker/0:2-303   [000] ....     9.762027: msi_domain_alloc_irqs: dev: 0000:bb:00.3 nvec 1 virq 306
     kworker/0:2-303   [000] ....     9.762037: msi_domain_alloc_irqs: dev: 0000:bb:00.3 nvec 1 virq 307
     kworker/0:2-303   [000] ....     9.762046: msi_domain_alloc_irqs: dev: 0000:bb:00.3 nvec 1 virq 308
     kworker/0:2-303   [000] ....     9.762055: msi_domain_alloc_irqs: dev: 0000:bb:00.3 nvec 1 virq 309
     kworker/0:2-303   [000] ....     9.762065: msi_domain_alloc_irqs: dev: 0000:bb:00.3 nvec 1 virq 310
     kworker/0:2-303   [000] ....     9.762074: msi_domain_alloc_irqs: dev: 0000:bb:00.3 nvec 1 virq 311
     kworker/0:2-303   [000] ....     9.762085: msi_domain_alloc_irqs: dev: 0000:bb:00.3 nvec 1 virq 312
     kworker/0:2-303   [000] ....     9.762094: msi_domain_alloc_irqs: dev: 0000:bb:00.3 nvec 1 virq 313
     kworker/0:2-303   [000] ....     9.762104: msi_domain_alloc_irqs: dev: 0000:bb:00.3 nvec 1 virq 314
     kworker/0:2-303   [000] ....     9.762113: msi_domain_alloc_irqs: dev: 0000:bb:00.3 nvec 1 virq 315
     kworker/0:2-303   [000] ....     9.762122: msi_domain_alloc_irqs: dev: 0000:bb:00.3 nvec 1 virq 316
     kworker/0:2-303   [000] ....     9.762133: msi_domain_alloc_irqs: dev: 0000:bb:00.3 nvec 1 virq 317
     kworker/0:2-303   [000] ....     9.762142: msi_domain_alloc_irqs: dev: 0000:bb:00.3 nvec 1 virq 318
     kworker/0:2-303   [000] ....     9.762151: msi_domain_alloc_irqs: dev: 0000:bb:00.3 nvec 1 virq 319
     kworker/0:2-303   [000] ....     9.762162: msi_domain_alloc_irqs: dev: 0000:bb:00.3 nvec 1 virq 320
     kworker/0:2-303   [000] ....     9.762171: msi_domain_alloc_irqs: dev: 0000:bb:00.3 nvec 1 virq 321
     kworker/0:2-303   [000] ....     9.762182: msi_domain_alloc_irqs: dev: 0000:bb:00.3 nvec 1 virq 322
     kworker/0:2-303   [000] ....     9.762191: msi_domain_alloc_irqs: dev: 0000:bb:00.3 nvec 1 virq 323
     kworker/0:2-303   [000] ....     9.762200: msi_domain_alloc_irqs: dev: 0000:bb:00.3 nvec 1 virq 324
     kworker/0:2-303   [000] ....     9.762209: msi_domain_alloc_irqs: dev: 0000:bb:00.3 nvec 1 virq 325
     kworker/0:2-303   [000] ....     9.762220: msi_domain_alloc_irqs: dev: 0000:bb:00.3 nvec 1 virq 326
     kworker/0:2-303   [000] ....     9.762231: msi_domain_alloc_irqs: dev: 0000:bb:00.3 nvec 1 virq 327
     kworker/0:2-303   [000] ....     9.762240: msi_domain_alloc_irqs: dev: 0000:bb:00.3 nvec 1 virq 328
     kworker/0:2-303   [000] ....     9.762249: msi_domain_alloc_irqs: dev: 0000:bb:00.3 nvec 1 virq 329
     kworker/0:2-303   [000] ....     9.762258: msi_domain_alloc_irqs: dev: 0000:bb:00.3 nvec 1 virq 330
     kworker/0:2-303   [000] ....     9.762268: msi_domain_alloc_irqs: dev: 0000:bb:00.3 nvec 1 virq 331
     kworker/0:2-303   [000] ....     9.762278: msi_domain_alloc_irqs: dev: 0000:bb:00.3 nvec 1 virq 332
     kworker/0:2-303   [000] ....     9.762288: msi_domain_alloc_irqs: dev: 0000:bb:00.3 nvec 1 virq 333
     kworker/0:0-3     [000] ....    12.026100: msi_domain_alloc_irqs: dev: 0000:00:04.0 nvec 1 virq 335
     kworker/0:0-3     [000] ....    12.143303: msi_domain_alloc_irqs: dev: 0000:00:04.1 nvec 1 virq 337
     kworker/0:0-3     [000] ....    12.158686: msi_domain_alloc_irqs: dev: 0000:00:04.2 nvec 1 virq 338
     kworker/0:0-3     [000] ....    12.168628: msi_domain_alloc_irqs: dev: 0000:00:04.3 nvec 1 virq 339
     kworker/0:0-3     [000] ....    12.176980: msi_domain_alloc_irqs: dev: 0000:00:04.4 nvec 1 virq 340
     kworker/0:0-3     [000] ....    12.185280: msi_domain_alloc_irqs: dev: 0000:00:04.5 nvec 1 virq 341
     kworker/0:0-3     [000] ....    12.204748: msi_domain_alloc_irqs: dev: 0000:00:04.6 nvec 1 virq 342
     kworker/0:0-3     [000] ....    12.214549: msi_domain_alloc_irqs: dev: 0000:00:04.7 nvec 1 virq 343
     kworker/0:1-169   [000] ....    12.440642: msi_domain_alloc_irqs: dev: 0000:b5:00.0 nvec 1 virq 344
     kworker/0:1-169   [000] ....    12.440664: msi_domain_alloc_irqs: dev: 0000:b5:00.0 nvec 1 virq 345
     kworker/0:1-169   [000] ....    12.440685: msi_domain_alloc_irqs: dev: 0000:b5:00.0 nvec 1 virq 346
     kworker/0:1-169   [000] ....    12.440704: msi_domain_alloc_irqs: dev: 0000:b5:00.0 nvec 1 virq 347
     kworker/0:1-169   [000] ....    12.440724: msi_domain_alloc_irqs: dev: 0000:b5:00.0 nvec 1 virq 348
     kworker/0:1-169   [000] ....    12.440742: msi_domain_alloc_irqs: dev: 0000:b5:00.0 nvec 1 virq 349
     kworker/0:1-169   [000] ....    12.440761: msi_domain_alloc_irqs: dev: 0000:b5:00.0 nvec 1 virq 350
     kworker/0:1-169   [000] ....    12.440780: msi_domain_alloc_irqs: dev: 0000:b5:00.0 nvec 1 virq 351
     kworker/0:1-169   [000] ....    12.440802: msi_domain_alloc_irqs: dev: 0000:b5:00.0 nvec 1 virq 352
     kworker/0:1-169   [000] ....    12.440822: msi_domain_alloc_irqs: dev: 0000:b5:00.0 nvec 1 virq 353
     kworker/0:1-169   [000] ....    12.440841: msi_domain_alloc_irqs: dev: 0000:b5:00.0 nvec 1 virq 354
     kworker/0:1-169   [000] ....    12.440860: msi_domain_alloc_irqs: dev: 0000:b5:00.0 nvec 1 virq 355
     kworker/0:1-169   [000] ....    12.440878: msi_domain_alloc_irqs: dev: 0000:b5:00.0 nvec 1 virq 356
     kworker/0:1-169   [000] ....    12.440897: msi_domain_alloc_irqs: dev: 0000:b5:00.0 nvec 1 virq 357
     kworker/0:1-169   [000] ....    12.440917: msi_domain_alloc_irqs: dev: 0000:b5:00.0 nvec 1 virq 358
     kworker/0:1-169   [000] ....    12.440936: msi_domain_alloc_irqs: dev: 0000:b5:00.0 nvec 1 virq 359
     kworker/0:1-169   [000] ....    12.440954: msi_domain_alloc_irqs: dev: 0000:b5:00.0 nvec 1 virq 360
     kworker/0:1-169   [000] ....    13.251009: msi_domain_alloc_irqs: dev: 0000:b7:00.0 nvec 1 virq 361
     kworker/0:1-169   [000] ....    13.251033: msi_domain_alloc_irqs: dev: 0000:b7:00.0 nvec 1 virq 362
     kworker/0:1-169   [000] ....    13.251055: msi_domain_alloc_irqs: dev: 0000:b7:00.0 nvec 1 virq 363
     kworker/0:1-169   [000] ....    13.251076: msi_domain_alloc_irqs: dev: 0000:b7:00.0 nvec 1 virq 364
     kworker/0:1-169   [000] ....    13.251100: msi_domain_alloc_irqs: dev: 0000:b7:00.0 nvec 1 virq 365
     kworker/0:1-169   [000] ....    13.251120: msi_domain_alloc_irqs: dev: 0000:b7:00.0 nvec 1 virq 366
     kworker/0:1-169   [000] ....    13.251142: msi_domain_alloc_irqs: dev: 0000:b7:00.0 nvec 1 virq 367
     kworker/0:1-169   [000] ....    13.251161: msi_domain_alloc_irqs: dev: 0000:b7:00.0 nvec 1 virq 368
     kworker/0:1-169   [000] ....    13.251182: msi_domain_alloc_irqs: dev: 0000:b7:00.0 nvec 1 virq 369
     kworker/0:1-169   [000] ....    13.251204: msi_domain_alloc_irqs: dev: 0000:b7:00.0 nvec 1 virq 370
     kworker/0:1-169   [000] ....    13.251224: msi_domain_alloc_irqs: dev: 0000:b7:00.0 nvec 1 virq 371
     kworker/0:1-169   [000] ....    13.251263: msi_domain_alloc_irqs: dev: 0000:b7:00.0 nvec 1 virq 372
     kworker/0:1-169   [000] ....    13.251288: msi_domain_alloc_irqs: dev: 0000:b7:00.0 nvec 1 virq 373
     kworker/0:1-169   [000] ....    13.251308: msi_domain_alloc_irqs: dev: 0000:b7:00.0 nvec 1 virq 374
     kworker/0:1-169   [000] ....    13.251330: msi_domain_alloc_irqs: dev: 0000:b7:00.0 nvec 1 virq 375
     kworker/0:1-169   [000] ....    13.251349: msi_domain_alloc_irqs: dev: 0000:b7:00.0 nvec 1 virq 376
     kworker/0:1-169   [000] ....    13.251374: msi_domain_alloc_irqs: dev: 0000:b7:00.0 nvec 1 virq 377
     kworker/0:1-169   [000] ....    14.043690: msi_domain_alloc_irqs: dev: 0000:b9:00.0 nvec 1 virq 378
     kworker/0:1-169   [000] ....    14.043721: msi_domain_alloc_irqs: dev: 0000:b9:00.0 nvec 1 virq 379
     kworker/0:1-169   [000] ....    14.043745: msi_domain_alloc_irqs: dev: 0000:b9:00.0 nvec 1 virq 380
     kworker/0:1-169   [000] ....    14.043767: msi_domain_alloc_irqs: dev: 0000:b9:00.0 nvec 1 virq 381
     kworker/0:1-169   [000] ....    14.043793: msi_domain_alloc_irqs: dev: 0000:b9:00.0 nvec 1 virq 382
     kworker/0:1-169   [000] ....    14.043817: msi_domain_alloc_irqs: dev: 0000:b9:00.0 nvec 1 virq 383
     kworker/0:1-169   [000] ....    14.043840: msi_domain_alloc_irqs: dev: 0000:b9:00.0 nvec 1 virq 384
     kworker/0:1-169   [000] ....    14.043862: msi_domain_alloc_irqs: dev: 0000:b9:00.0 nvec 1 virq 385
     kworker/0:1-169   [000] ....    14.043884: msi_domain_alloc_irqs: dev: 0000:b9:00.0 nvec 1 virq 386
     kworker/0:1-169   [000] ....    14.043909: msi_domain_alloc_irqs: dev: 0000:b9:00.0 nvec 1 virq 387
     kworker/0:1-169   [000] ....    14.043932: msi_domain_alloc_irqs: dev: 0000:b9:00.0 nvec 1 virq 388
     kworker/0:1-169   [000] ....    14.043953: msi_domain_alloc_irqs: dev: 0000:b9:00.0 nvec 1 virq 389
     kworker/0:1-169   [000] ....    14.043975: msi_domain_alloc_irqs: dev: 0000:b9:00.0 nvec 1 virq 390
     kworker/0:1-169   [000] ....    14.043997: msi_domain_alloc_irqs: dev: 0000:b9:00.0 nvec 1 virq 391
     kworker/0:1-169   [000] ....    14.044021: msi_domain_alloc_irqs: dev: 0000:b9:00.0 nvec 1 virq 392
     kworker/0:1-169   [000] ....    14.044043: msi_domain_alloc_irqs: dev: 0000:b9:00.0 nvec 1 virq 393
     kworker/0:1-169   [000] ....    14.044065: msi_domain_alloc_irqs: dev: 0000:b9:00.0 nvec 1 virq 394
     kworker/0:1-169   [000] ....  5181.743530: msi_domain_alloc_irqs: dev: 0000:00:1f.6 nvec 1 virq 395
              ip-2037  [029] ....  5182.263982: msi_domain_alloc_irqs: dev: 0000:00:1f.6 nvec 1 virq 395
              ip-2037  [029] ....  5182.367473: msi_domain_alloc_irqs: dev: 0000:00:1f.6 nvec 1 virq 395

 bb:00.[0-3] Ethernet controller: Intel Corporation Device 37d0 (rev 03)

-+-[0000:b2]-+-00.0-[b3-bc]----00.0-[b4-bc]--+-00.0-[b5-b6]----00.0
 |           |                               +-01.0-[b7-b8]----00.0
 |           |                               +-02.0-[b9-ba]----00.0
 |           |                               \-03.0-[bb-bc]--+-00.0
 |           |                                               +-00.1
 |           |                                               +-00.2
 |           |                                               \-00.3

and they are using i40e driver, the vectors should be reserved by:
i40e_probe() ->
  i40e_init_interrupt_scheme() ->
    i40e_init_msix() ->
      i40e_reserve_msix_vectors() ->
        pci_enable_msix_range()

# ls /sys/kernel/debug/irq/irqs
0  10   11  13  142  184  217  259  292  31  33
337  339  340  342  344  346  348  350  352  354  356
358  360  362  364  366  368  370  372  374  376  378
380  382  384  386  388  390  392  394  4  6   7  9
1  109  12  14  15   2    24   26   3    32  335
338  34   341  343  345  347  349  351  353  355  357
359  361  363  365  367  369  371  373  375  377  379
381  383  385  387  389  391  393  395  5  67  8

# cat /sys/kernel/debug/irq/domains/* 

name:   VECTOR
 size:   0
 mapped: 388
 flags:  0x00000041
name:   IO-APIC-0
 size:   24
 mapped: 16
 flags:  0x00000041
 parent: VECTOR
    name:   VECTOR
     size:   0
     mapped: 388
     flags:  0x00000041
name:   IO-APIC-1
 size:   8
 mapped: 2
 flags:  0x00000041
 parent: VECTOR
    name:   VECTOR
     size:   0
     mapped: 388
     flags:  0x00000041
name:   IO-APIC-2
 size:   8
 mapped: 0
 flags:  0x00000041
 parent: VECTOR
    name:   VECTOR
     size:   0
     mapped: 388
     flags:  0x00000041
name:   IO-APIC-3
 size:   8
 mapped: 0
 flags:  0x00000041
 parent: VECTOR
    name:   VECTOR
     size:   0
     mapped: 388
     flags:  0x00000041
name:   IO-APIC-4
 size:   8
 mapped: 5
 flags:  0x00000041
 parent: VECTOR
    name:   VECTOR
     size:   0
     mapped: 388
     flags:  0x00000041
name:   PCI-HT
 size:   0
 mapped: 0
 flags:  0x00000041
 parent: VECTOR
    name:   VECTOR
     size:   0
     mapped: 388
     flags:  0x00000041
name:   PCI-MSI-2
 size:   0
 mapped: 365
 flags:  0x00000051
 parent: VECTOR
    name:   VECTOR
     size:   0
     mapped: 388
     flags:  0x00000041
name:   VECTOR
 size:   0
 mapped: 388
 flags:  0x00000041

Thanks,
	Yu
> Thanks,
> 
> 	tglx
> 
> 8<-------------------
> --- a/kernel/irq/msi.c
> +++ b/kernel/irq/msi.c
> @@ -372,6 +372,9 @@ int msi_domain_alloc_irqs(struct irq_dom
>  			return ret;
>  		}
>  
> +		trace_printk("dev: %s nvec %d virq %d\n",
> +			     dev_name(dev), desc->nvec_used, virq);
> +
>  		for (i = 0; i < desc->nvec_used; i++)
>  			irq_set_msi_desc_off(virq, i, desc);
>  	}
> @@ -419,6 +422,8 @@ void msi_domain_free_irqs(struct irq_dom
>  		 * entry. If that's the case, don't do anything.
>  		 */
>  		if (desc->irq) {
> +			trace_printk("dev: %s nvec %d virq %d\n",
> +				     dev_name(dev), desc->nvec_used, desc->irq);
>  			irq_domain_free_irqs(desc->irq, desc->nvec_used);
>  			desc->irq = 0;
>  		}

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