3f97016857
Complete pseudo probes decoding can result in large memory usage. In practice only a small porting of the decoded probes are used in profile generation. I'm changing the full decoding mode to be decoding for profiled functions only, though we still do a full scan of the .pseudoprobe section due to a missing table-of-content but we don't have to build the in-memory data structure for functions not sampled. To build the in-memory data structure for profiled functions only, I'm rewriting the previous non-recursive probe decoding logic to be recursive. This is easy to read and maintain. I also have to change the previous representation of unsymbolized context from probe-based stack to address-based stack since the profiled functions are unknown yet by the time of virtual unwinding. The address-based stack will be converted to probe-based stack after virtual unwinding and on-demand probe decoding. I'm seeing 20GB memory is saved for one of our internal large service. Reviewed By: wenlei Differential Revision: https://reviews.llvm.org/D121643
65 lines
2.3 KiB
Plaintext
65 lines
2.3 KiB
Plaintext
; RUN: llvm-profgen --format=text --perfscript=%S/Inputs/noinline-cs-pseudoprobe.perfscript --binary=%S/Inputs/noinline-cs-pseudoprobe.perfbin --output=%t --skip-symbolization --profile-summary-cold-count=0
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; RUN: FileCheck %s --input-file %t --check-prefix=CHECK-UNWINDER
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; RUN: llvm-profgen --format=text --perfscript=%S/Inputs/noinline-cs-pseudoprobe.perfscript --binary=%S/Inputs/noinline-cs-pseudoprobe.perfbin --output=%t --profile-summary-cold-count=0 --csspgo-preinliner=0 --gen-cs-nested-profile=0
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; RUN: FileCheck %s --input-file %t
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; RUN: llvm-profgen --format=text --perfscript=%S/Inputs/noinline-cs-pseudoprobe.aggperfscript --binary=%S/Inputs/noinline-cs-pseudoprobe.perfbin --output=%t --skip-symbolization --profile-summary-cold-count=0
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; RUN: FileCheck %s --input-file %t --check-prefix=CHECK-UNWINDER
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; RUN: llvm-profgen --format=text --perfscript=%S/Inputs/noinline-cs-pseudoprobe.aggperfscript --binary=%S/Inputs/noinline-cs-pseudoprobe.perfbin --output=%t --profile-summary-cold-count=0 --csspgo-preinliner=0 --gen-cs-nested-profile=0
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; RUN: FileCheck %s --input-file %t
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; CHECK: [main:2 @ foo]:75:0
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; CHECK-NEXT: 1: 0
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; CHECK-NEXT: 2: 15
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; CHECK-NEXT: 3: 15
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; CHECK-NEXT: 4: 15
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; CHECK-NEXT: 5: 0
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; CHECK-NEXT: 6: 15
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; CHECK-NEXT: 7: 0
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; CHECK-NEXT: 8: 15 bar:15
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; CHECK-NEXT: 9: 0
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; CHECK-NEXT: !CFGChecksum: 563088904013236
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; CHECK:[main:2 @ foo:8 @ bar]:30:15
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; CHECK-NEXT: 1: 15
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; CHECK-NEXT: 4: 15
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; CHECK-NEXT: !CFGChecksum: 72617220756
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; CHECK-UNWINDER: [0x7f4]
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; CHECK-UNWINDER-NEXT: 2
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; CHECK-UNWINDER-NEXT: 79e-7bf:15
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; CHECK-UNWINDER-NEXT: 7c4-7cf:15
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; CHECK-UNWINDER-NEXT: 2
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; CHECK-UNWINDER-NEXT: 7bf->760:15
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; CHECK-UNWINDER-NEXT: 7cf->79e:16
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; CHECK-UNWINDER-NEXT: [0x7f4 @ 0x7bf]
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; CHECK-UNWINDER-NEXT: 1
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; CHECK-UNWINDER-NEXT: 760-77f:15
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; CHECK-UNWINDER-NEXT: 1
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; CHECK-UNWINDER-NEXT: 77f->7c4:17
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; clang -O3 -fexperimental-new-pass-manager -fuse-ld=lld -fpseudo-probe-for-profiling
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; -fno-omit-frame-pointer -mno-omit-leaf-frame-pointer -Xclang -mdisable-tail-calls
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; -fno-inline-functions -g test.c -o a.out
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#include <stdio.h>
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int bar(int x, int y) {
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if (x % 3) {
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return x - y;
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}
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return x + y;
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}
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void foo() {
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int s, i = 0;
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while (i++ < 4000 * 4000)
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if (i % 91) s = bar(i, s); else s += 30;
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printf("sum is %d\n", s);
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}
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int main() {
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foo();
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return 0;
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}
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