0a4184909a
This patch adds support for optional memory profile information to be included with and indexed profile. The indexed profile header adds a new field which points to the offset of the memory profile section (if present) in the indexed profile. For users who do not utilize this feature the only overhead is a 64-bit offset in the header. The memory profile section contains (1) profile metadata describing the information recorded for each entry (2) an on-disk hashtable containing the profile records indexed via llvm::md5(function_name). We chose to introduce a separate hash table instead of the existing one since the indexing for the instrumented fdo hash table is based on a CFG hash which itself is perturbed by memprof instrumentation. This commit also includes the changes reviewed separately in D120093. Differential Revision: https://reviews.llvm.org/D120103
48 lines
1.4 KiB
Plaintext
48 lines
1.4 KiB
Plaintext
REQUIRES: x86_64-linux
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The input memprof and instrumented raw profiles were generated from the following source code:
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```
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#include <stdlib.h>
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#include <string.h>
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int main(int argc, char **argv) {
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char *x = (char *)malloc(10);
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memset(x, 0, 10);
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free(x);
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x = (char *)malloc(10);
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memset(x, 0, 10);
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free(x);
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return 0;
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}
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```
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Steps to collect the memprof raw profile and the instrprof raw profile:
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```
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# Collect instrprof profile with name compression disabled since some buildbots
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# do not have zlib.
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clang -mllvm -enable-name-compression=false -fprofile-generate source.c -o instr.out
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./instr.out
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mv *.profraw basic.profraw
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# Collect memprof profile.
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clang -fuse-ld=lld -Wl,--no-rosegment -gmlt -fdebug-info-for-profiling \
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-fmemory-profile -mno-omit-leaf-frame-pointer -fno-omit-frame-pointer \
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-fno-optimize-sibling-calls -m64 -Wl,-build-id source.c -o basic.memprofexe
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env MEMPROF_OPTIONS=log_path=stdout ./rawprofile.out > basic.memprofraw
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```
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RUN: llvm-profdata merge %p/Inputs/basic.profraw %p/Inputs/basic.memprofraw --profiled-binary %p/Inputs/basic.memprofexe -o %t.prof
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RUN: llvm-profdata show %t.prof | FileCheck %s
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For now we only check the validity of the instrumented profile since we don't
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have a way to display the contents of the memprof indexed format yet.
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CHECK: Instrumentation level: IR entry_first = 0
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CHECK: Total functions: 1
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CHECK: Maximum function count: 1
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CHECK: Maximum internal block count: 0
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