1 .. SPDX-License-Identifier: GPL-2.0
2
3 ========================
4 VCPU Dispatch Statistics
5 ========================
6
7 For Shared Processor LPARs, the POWER Hypervis
8 static mapping of the LPAR processors (vcpus)
9 chips (representing the "home" node) and tries
10 on their associated physical processor chip. H
11 scenarios, vcpus may be dispatched on a differ
12 from its home node).
13
14 /proc/powerpc/vcpudispatch_stats can be used t
15 related to the vcpu dispatch behavior. Writing
16 collecting the statistics, while writing '0' d
17 By default, the DTLB log for each vcpu is proc
18 as not to miss any entries. This processing fr
19 through /proc/powerpc/vcpudispatch_stats_freq.
20
21 The statistics themselves are available by rea
22 /proc/powerpc/vcpudispatch_stats. Each line in
23 a vcpu as represented by the first field, foll
24
25 The first number corresponds to:
26
27 1. total vcpu dispatches since the beginning o
28
29 The next 4 numbers represent vcpu dispatch dis
30
31 2. number of times this vcpu was dispatched on
32 time
33 3. number of times this vcpu was dispatched on
34 as last time, but within the same chip
35 4. number of times this vcpu was dispatched on
36 5. number of times this vcpu was dispatches on
37 (next numa boundary)
38
39 The final 3 numbers represent statistics in re
40 the vcpu:
41
42 6. number of times this vcpu was dispatched in
43 7. number of times this vcpu was dispatched in
44 8. number of times this vcpu was dispatched in
45 distance)
46
47 An example output::
48
49 $ sudo cat /proc/powerpc/vcpudispatch_stat
50 cpu0 6839 4126 2683 30 0 6821 18 0
51 cpu1 2515 1274 1229 12 0 2509 6 0
52 cpu2 2317 1198 1109 10 0 2312 5 0
53 cpu3 2259 1165 1088 6 0 2256 3 0
54 cpu4 2205 1143 1056 6 0 2202 3 0
55 cpu5 2165 1121 1038 6 0 2162 3 0
56 cpu6 2183 1127 1050 6 0 2180 3 0
57 cpu7 2193 1133 1052 8 0 2187 6 0
58 cpu8 2165 1115 1032 18 0 2156 9 0
59 cpu9 2301 1252 1033 16 0 2293 8 0
60 cpu10 2197 1138 1041 18 0 2187 10 0
61 cpu11 2273 1185 1062 26 0 2260 13 0
62 cpu12 2186 1125 1043 18 0 2177 9 0
63 cpu13 2161 1115 1030 16 0 2153 8 0
64 cpu14 2206 1153 1033 20 0 2196 10 0
65 cpu15 2163 1115 1032 16 0 2155 8 0
66
67 In the output above, for vcpu0, there have bee
68 statistics were enabled. 4126 of those dispatc
69 physical cpu as the last time. 2683 were on a
70 the same chip, while 30 dispatches were on a d
71 its last dispatch.
72
73 Also, out of the total of 6839 dispatches, we
74 6821 dispatches on the vcpu's home node, while
75 outside its home node, on a neighbouring chip.
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