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[memprof] Add flag to control profile dump at exit #119452

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Merged
merged 2 commits into from
Dec 10, 2024
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[memprof] Add flag to control profile dump at exit #119452

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[memprof] Add flag to control profile dump at exit
ellishg Dec 10, 2024
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ellishg Dec 10, 2024
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3 changes: 2 additions & 1 deletion compiler-rt/lib/memprof/memprof_allocator.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -301,7 +301,8 @@ struct Allocator {

~Allocator() {
atomic_store_relaxed(&destructing, 1);
FinishAndWrite();
if (flags()->dump_at_exit)
FinishAndWrite();
}

static void PrintCallback(const uptr Key, LockedMemInfoBlock *const &Value,
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4 changes: 3 additions & 1 deletion compiler-rt/lib/memprof/memprof_flags.inc
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Expand Up @@ -38,4 +38,6 @@ MEMPROF_FLAG(bool, allocator_frees_and_returns_null_on_realloc_zero, true,
MEMPROF_FLAG(bool, print_text, false,
"If set, prints the heap profile in text format. Else use the raw binary serialization format.")
MEMPROF_FLAG(bool, print_terse, false,
"If set, prints memory profile in a terse format. Only applicable if print_text = true.")
"If set, prints memory profile in a terse format. Only applicable if print_text = true.")
MEMPROF_FLAG(bool, dump_at_exit, true,
"If set, dump profiles when the program terminates.")
16 changes: 16 additions & 0 deletions compiler-rt/test/memprof/TestCases/dump_at_exit.cpp
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@@ -0,0 +1,16 @@
// RUN: %clangxx_memprof %s -o %t

// RUN: %env_memprof_opts=print_text=true:log_path=stdout:dump_at_exit=false %run %t | count 0
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@snehasish snehasish Dec 10, 2024

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What is count 0 here?

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@ellishg ellishg Dec 10, 2024

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count N will pass if it reads N lines from stdin. So this just checks that there is no output.

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@snehasish snehasish Dec 10, 2024

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Ah count is a utility we bundle with LLVM for testing. TIL.

// RUN: %env_memprof_opts=print_text=true:log_path=stdout:dump_at_exit=true %run %t | FileCheck %s

#include <stdlib.h>
#include <string.h>

int main() {
char *x = (char *)malloc(10);
memset(x, 0, 10);
free(x);
return 0;
}

// CHECK: Recorded MIBs
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