1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
|
;; Test context disambiguation for a callgraph containing multiple memprof
;; contexts and no inlining, where we need to perform additional cloning
;; during function assignment/cloning to handle the combination of contexts
;; to 2 different allocations.
;;
;; void E(char **buf1, char **buf2) {
;; *buf1 = new char[10];
;; *buf2 = new char[10];
;; }
;;
;; void B(char **buf1, char **buf2) {
;; E(buf1, buf2);
;; }
;;
;; void C(char **buf1, char **buf2) {
;; E(buf1, buf2);
;; }
;;
;; void D(char **buf1, char **buf2) {
;; E(buf1, buf2);
;; }
;; int main(int argc, char **argv) {
;; char *cold1, *cold2, *default1, *default2, *default3, *default4;
;; B(&default1, &default2);
;; C(&default3, &cold1);
;; D(&cold2, &default4);
;; memset(cold1, 0, 10);
;; memset(cold2, 0, 10);
;; memset(default1, 0, 10);
;; memset(default2, 0, 10);
;; memset(default3, 0, 10);
;; memset(default4, 0, 10);
;; delete[] default1;
;; delete[] default2;
;; delete[] default3;
;; delete[] default4;
;; sleep(10);
;; delete[] cold1;
;; delete[] cold2;
;; return 0;
;; }
;;
;; Code compiled with -mllvm -memprof-min-lifetime-cold-threshold=5 so that the
;; memory freed after sleep(10) results in cold lifetimes.
;;
;; The IR was then reduced using llvm-reduce with the expected FileCheck input.
;; -stats requires asserts
; REQUIRES: asserts
; RUN: opt -thinlto-bc %s >%t.o
; RUN: llvm-lto2 run %t.o -enable-memprof-context-disambiguation \
; RUN: -supports-hot-cold-new \
; RUN: -r=%t.o,main,plx \
; RUN: -r=%t.o,_ZdaPv, \
; RUN: -r=%t.o,sleep, \
; RUN: -r=%t.o,_Znam, \
; RUN: -memprof-verify-ccg -memprof-verify-nodes -memprof-dump-ccg \
; RUN: -stats -pass-remarks=memprof-context-disambiguation -save-temps \
; RUN: -o %t.out 2>&1 | FileCheck %s --check-prefix=DUMP \
; RUN: --check-prefix=STATS --check-prefix=STATS-BE --check-prefix=REMARKS
; RUN: llvm-dis %t.out.1.4.opt.bc -o - | FileCheck %s --check-prefix=IR
;; Try again but with distributed ThinLTO
; RUN: llvm-lto2 run %t.o -enable-memprof-context-disambiguation \
; RUN: -supports-hot-cold-new \
; RUN: -thinlto-distributed-indexes \
; RUN: -r=%t.o,main,plx \
; RUN: -r=%t.o,_ZdaPv, \
; RUN: -r=%t.o,sleep, \
; RUN: -r=%t.o,_Znam, \
; RUN: -memprof-verify-ccg -memprof-verify-nodes -memprof-dump-ccg \
; RUN: -stats -pass-remarks=memprof-context-disambiguation \
; RUN: -o %t2.out 2>&1 | FileCheck %s --check-prefix=DUMP \
; RUN: --check-prefix=STATS
;; Run ThinLTO backend
; RUN: opt -passes=memprof-context-disambiguation \
; RUN: -memprof-import-summary=%t.o.thinlto.bc \
; RUN: -stats -pass-remarks=memprof-context-disambiguation \
; RUN: %t.o -S 2>&1 | FileCheck %s --check-prefix=IR \
; RUN: --check-prefix=STATS-BE --check-prefix=REMARKS
source_filename = "funcassigncloning.ll"
target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"
; Function Attrs: noinline optnone
define internal void @_Z1EPPcS0_(ptr %buf1, ptr %buf2) #0 {
entry:
%call = call ptr @_Znam(i64 noundef 10), !memprof !0, !callsite !7
%call1 = call ptr @_Znam(i64 noundef 10), !memprof !8, !callsite !15
ret void
}
declare ptr @_Znam(i64)
define internal void @_Z1BPPcS0_() {
entry:
call void @_Z1EPPcS0_(ptr null, ptr null), !callsite !16
ret void
}
define internal void @_Z1CPPcS0_() {
entry:
call void @_Z1EPPcS0_(ptr null, ptr null), !callsite !17
ret void
}
define internal void @_Z1DPPcS0_() {
entry:
call void @_Z1EPPcS0_(ptr null, ptr null), !callsite !18
ret void
}
; Function Attrs: noinline optnone
define i32 @main() #0 {
entry:
call void @_Z1BPPcS0_()
call void @_Z1CPPcS0_()
call void @_Z1DPPcS0_()
ret i32 0
}
declare void @_ZdaPv()
declare i32 @sleep()
; uselistorder directives
uselistorder ptr @_Znam, { 1, 0 }
attributes #0 = { noinline optnone }
!0 = !{!1, !3, !5}
!1 = !{!2, !"cold"}
!2 = !{i64 -3461278137325233666, i64 -7799663586031895603}
!3 = !{!4, !"notcold"}
!4 = !{i64 -3461278137325233666, i64 -3483158674395044949}
!5 = !{!6, !"notcold"}
!6 = !{i64 -3461278137325233666, i64 -2441057035866683071}
!7 = !{i64 -3461278137325233666}
!8 = !{!9, !11, !13}
!9 = !{!10, !"notcold"}
!10 = !{i64 -1415475215210681400, i64 -2441057035866683071}
!11 = !{!12, !"cold"}
!12 = !{i64 -1415475215210681400, i64 -3483158674395044949}
!13 = !{!14, !"notcold"}
!14 = !{i64 -1415475215210681400, i64 -7799663586031895603}
!15 = !{i64 -1415475215210681400}
!16 = !{i64 -2441057035866683071}
!17 = !{i64 -3483158674395044949}
!18 = !{i64 -7799663586031895603}
;; Originally we create a single clone of each call to new from E, since each
;; allocates cold memory for a single caller.
; DUMP: CCG after cloning:
; DUMP: Callsite Context Graph:
; DUMP: Node [[ENEW1ORIG:0x[a-z0-9]+]]
; DUMP: Versions: 1 MIB:
; DUMP: AllocType 2 StackIds: 0
; DUMP: AllocType 1 StackIds: 1
; DUMP: AllocType 1 StackIds: 2
; DUMP: (clone 0)
; DUMP: AllocTypes: NotCold
; DUMP: ContextIds: 2 3
; DUMP: CalleeEdges:
; DUMP: CallerEdges:
; DUMP: Edge from Callee [[ENEW1ORIG]] to Caller: [[C:0x[a-z0-9]+]] AllocTypes: NotCold ContextIds: 2
; DUMP: Edge from Callee [[ENEW1ORIG]] to Caller: [[B:0x[a-z0-9]+]] AllocTypes: NotCold ContextIds: 3
; DUMP: Clones: [[ENEW1CLONE:0x[a-z0-9]+]]
; DUMP: Node [[D:0x[a-z0-9]+]]
; DUMP: Callee: 16147627620923572899 (_Z1EPPcS0_) Clones: 0 StackIds: 0 (clone 0)
; DUMP: AllocTypes: NotColdCold
; DUMP: ContextIds: 1 6
; DUMP: CalleeEdges:
; DUMP: Edge from Callee [[ENEW1CLONE]] to Caller: [[D]] AllocTypes: Cold ContextIds: 1
; DUMP: Edge from Callee [[ENEW2ORIG:0x[a-z0-9]+]] to Caller: [[D]] AllocTypes: NotCold ContextIds: 6
; DUMP: CallerEdges:
; DUMP: Node [[C]]
; DUMP: Callee: 16147627620923572899 (_Z1EPPcS0_) Clones: 0 StackIds: 1 (clone 0)
; DUMP: AllocTypes: NotColdCold
; DUMP: ContextIds: 2 5
; DUMP: CalleeEdges:
; DUMP: Edge from Callee [[ENEW1ORIG]] to Caller: [[C]] AllocTypes: NotCold ContextIds: 2
; DUMP: Edge from Callee [[ENEW2CLONE:0x[a-z0-9]+]] to Caller: [[C]] AllocTypes: Cold ContextIds: 5
; DUMP: CallerEdges:
; DUMP: Node [[B]]
; DUMP: Callee: 16147627620923572899 (_Z1EPPcS0_) Clones: 0 StackIds: 2 (clone 0)
; DUMP: AllocTypes: NotCold
; DUMP: ContextIds: 3 4
; DUMP: CalleeEdges:
; DUMP: Edge from Callee [[ENEW1ORIG]] to Caller: [[B]] AllocTypes: NotCold ContextIds: 3
; DUMP: Edge from Callee [[ENEW2ORIG]] to Caller: [[B]] AllocTypes: NotCold ContextIds: 4
; DUMP: CallerEdges:
; DUMP: Node [[ENEW2ORIG]]
; DUMP: Versions: 1 MIB:
; DUMP: AllocType 1 StackIds: 2
; DUMP: AllocType 2 StackIds: 1
; DUMP: AllocType 1 StackIds: 0
; DUMP: (clone 0)
; DUMP: AllocTypes: NotCold
; DUMP: ContextIds: 4 6
; DUMP: CalleeEdges:
; DUMP: CallerEdges:
; DUMP: Edge from Callee [[ENEW2ORIG]] to Caller: [[B]] AllocTypes: NotCold ContextIds: 4
; DUMP: Edge from Callee [[ENEW2ORIG]] to Caller: [[D]] AllocTypes: NotCold ContextIds: 6
; DUMP: Clones: [[ENEW2CLONE]]
; DUMP: Node [[ENEW1CLONE]]
; DUMP: Versions: 1 MIB:
; DUMP: AllocType 2 StackIds: 0
; DUMP: AllocType 1 StackIds: 1
; DUMP: AllocType 1 StackIds: 2
; DUMP: (clone 0)
; DUMP: AllocTypes: Cold
; DUMP: ContextIds: 1
; DUMP: CalleeEdges:
; DUMP: CallerEdges:
; DUMP: Edge from Callee [[ENEW1CLONE]] to Caller: [[D]] AllocTypes: Cold ContextIds: 1
; DUMP: Clone of [[ENEW1ORIG]]
; DUMP: Node [[ENEW2CLONE]]
; DUMP: Versions: 1 MIB:
; DUMP: AllocType 1 StackIds: 2
; DUMP: AllocType 2 StackIds: 1
; DUMP: AllocType 1 StackIds: 0
; DUMP: (clone 0)
; DUMP: AllocTypes: Cold
; DUMP: ContextIds: 5
; DUMP: CalleeEdges:
; DUMP: CallerEdges:
; DUMP: Edge from Callee [[ENEW2CLONE]] to Caller: [[C]] AllocTypes: Cold ContextIds: 5
; DUMP: Clone of [[ENEW2ORIG]]
;; We greedily create a clone of E that is initially used by the clones of the
;; first call to new. However, we end up with an incompatible set of callers
;; given the second call to new which has clones with a different combination of
;; callers. Eventually, we create 2 more clones, and the first clone becomes dead.
; REMARKS: created clone _Z1EPPcS0_.memprof.1
; REMARKS: created clone _Z1EPPcS0_.memprof.2
; REMARKS: created clone _Z1EPPcS0_.memprof.3
; REMARKS: call in clone _Z1EPPcS0_ marked with memprof allocation attribute notcold
; REMARKS: call in clone _Z1EPPcS0_.memprof.2 marked with memprof allocation attribute cold
; REMARKS: call in clone _Z1EPPcS0_.memprof.3 marked with memprof allocation attribute notcold
; REMARKS: call in clone _Z1EPPcS0_ marked with memprof allocation attribute notcold
; REMARKS: call in clone _Z1EPPcS0_.memprof.2 marked with memprof allocation attribute notcold
; REMARKS: call in clone _Z1EPPcS0_.memprof.3 marked with memprof allocation attribute cold
; REMARKS: call in clone _Z1CPPcS0_ assigned to call function clone _Z1EPPcS0_.memprof.3
; REMARKS: call in clone _Z1DPPcS0_ assigned to call function clone _Z1EPPcS0_.memprof.2
;; Original version of E is used for the non-cold allocations, both from B.
; IR: define internal {{.*}} @_Z1EPPcS0_(
; IR: call {{.*}} @_Znam(i64 noundef 10) #[[NOTCOLD:[0-9]+]]
; IR: call {{.*}} @_Znam(i64 noundef 10) #[[NOTCOLD]]
; IR: define internal {{.*}} @_Z1BPPcS0_(
; IR: call {{.*}} @_Z1EPPcS0_(
;; C calls a clone of E with the first new allocating cold memory and the
;; second allocating non-cold memory.
; IR: define internal {{.*}} @_Z1CPPcS0_(
; IR: call {{.*}} @_Z1EPPcS0_.memprof.3(
;; D calls a clone of E with the first new allocating non-cold memory and the
;; second allocating cold memory.
; IR: define internal {{.*}} @_Z1DPPcS0_(
; IR: call {{.*}} @_Z1EPPcS0_.memprof.2(
; IR: define internal {{.*}} @_Z1EPPcS0_.memprof.2(
; IR: call {{.*}} @_Znam(i64 noundef 10) #[[COLD:[0-9]+]]
; IR: call {{.*}} @_Znam(i64 noundef 10) #[[NOTCOLD]]
; IR: define internal {{.*}} @_Z1EPPcS0_.memprof.3(
; IR: call {{.*}} @_Znam(i64 noundef 10) #[[NOTCOLD]]
; IR: call {{.*}} @_Znam(i64 noundef 10) #[[COLD]]
; IR: attributes #[[NOTCOLD]] = { "memprof"="notcold" }
; IR: attributes #[[COLD]] = { "memprof"="cold" }
; STATS: 2 memprof-context-disambiguation - Number of cold static allocations (possibly cloned)
; STATS-BE: 2 memprof-context-disambiguation - Number of cold static allocations (possibly cloned) during ThinLTO backend
; STATS: 4 memprof-context-disambiguation - Number of not cold static allocations (possibly cloned)
; STATS-BE: 4 memprof-context-disambiguation - Number of not cold static allocations (possibly cloned) during ThinLTO backend
; STATS-BE: 8 memprof-context-disambiguation - Number of allocation versions (including clones) during ThinLTO backend
; STATS: 3 memprof-context-disambiguation - Number of function clones created during whole program analysis
; STATS-BE: 3 memprof-context-disambiguation - Number of function clones created during ThinLTO backend
; STATS-BE: 1 memprof-context-disambiguation - Number of functions that had clones created during ThinLTO backend
; STATS-BE: 4 memprof-context-disambiguation - Maximum number of allocation versions created for an original allocation during ThinLTO backend
; STATS-BE: 2 memprof-context-disambiguation - Number of original (not cloned) allocations with memprof profiles during ThinLTO backend
|
