4caa1f0977
Expose jemalloc stats through the malloc_info(3) interface. Bug: 16874689 Change-Id: I4358ac283002e60ff161107028d1a3fb1e9afb0a
94 lines
2.5 KiB
C++
94 lines
2.5 KiB
C++
/*
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* Copyright (C) 2014 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "malloc_info.h"
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#include <errno.h>
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#include "private/bionic_macros.h"
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class __LIBC_HIDDEN__ Elem {
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public:
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// name must be valid throughout lifetime of the object.
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explicit Elem(FILE* fp, const char* name,
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const char* attr_fmt = nullptr, ...) {
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this->fp = fp;
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this->name = name;
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fprintf(fp, "<%s", name);
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if (attr_fmt != nullptr) {
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va_list args;
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va_start(args, attr_fmt);
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fputc(' ', fp);
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vfprintf(fp, attr_fmt, args);
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va_end(args);
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}
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fputc('>', fp);
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}
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~Elem() noexcept {
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fprintf(fp, "</%s>", name);
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}
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void contents(const char* fmt, ...) {
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va_list args;
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va_start(args, fmt);
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vfprintf(fp, fmt, args);
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va_end(args);
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}
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private:
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FILE* fp;
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const char* name;
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DISALLOW_COPY_AND_ASSIGN(Elem);
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};
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int malloc_info(int options, FILE* fp) {
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if (options != 0) {
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errno = EINVAL;
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return -1;
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}
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Elem root(fp, "malloc", "version=\"jemalloc-1\"");
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// Dump all of the large allocations in the arenas.
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for (size_t i = 0; i < __mallinfo_narenas(); i++) {
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struct mallinfo mi = __mallinfo_arena_info(i);
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if (mi.hblkhd != 0) {
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Elem arena_elem(fp, "heap", "nr=\"%d\"", i);
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{
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Elem(fp, "allocated-large").contents("%zu", mi.ordblks);
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Elem(fp, "allocated-huge").contents("%zu", mi.uordblks);
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Elem(fp, "allocated-bins").contents("%zu", mi.fsmblks);
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size_t total = 0;
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for (size_t j = 0; j < __mallinfo_nbins(); j++) {
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struct mallinfo mi = __mallinfo_bin_info(i, j);
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if (mi.ordblks != 0) {
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Elem bin_elem(fp, "bin", "nr=\"%d\"", j);
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Elem(fp, "allocated").contents("%zu", mi.ordblks);
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Elem(fp, "nmalloc").contents("%zu", mi.uordblks);
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Elem(fp, "ndalloc").contents("%zu", mi.fordblks);
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total += mi.ordblks;
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}
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}
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Elem(fp, "bins-total").contents("%zu", total);
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}
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}
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}
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return 0;
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}
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