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121 lines
3.8 KiB
121 lines
3.8 KiB
/*
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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 <err.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <inttypes.h>
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#include <stdarg.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <string.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <unistd.h>
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#include <android-base/unique_fd.h>
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#include <async_safe/log.h>
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#include "NativeInfo.h"
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void NativePrintf(const char* fmt, ...) {
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va_list args;
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va_start(args, fmt);
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char buffer[512];
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int buffer_len = async_safe_format_buffer_va_list(buffer, sizeof(buffer), fmt, args);
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va_end(args);
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(void)write(STDOUT_FILENO, buffer, buffer_len);
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}
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void NativeFormatFloat(char* buffer, size_t buffer_len, uint64_t value, uint64_t divisor) {
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uint64_t hundreds = ((((value % divisor) * 1000) / divisor) + 5) / 10;
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async_safe_format_buffer(buffer, buffer_len, "%" PRIu64 ".%02" PRIu64, value / divisor, hundreds);
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}
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// This function is not re-entrant since it uses a static buffer for
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// the line data.
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void NativeGetInfo(int smaps_fd, size_t* rss_bytes, size_t* va_bytes) {
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size_t total_rss_bytes = 0;
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size_t total_va_bytes = 0;
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bool native_map = false;
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char buf[1024];
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size_t buf_start = 0;
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size_t buf_bytes = 0;
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while (true) {
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ssize_t bytes =
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TEMP_FAILURE_RETRY(read(smaps_fd, buf + buf_bytes, sizeof(buf) - buf_bytes - 1));
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if (bytes <= 0) {
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break;
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}
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buf_bytes += bytes;
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while (buf_bytes > 0) {
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char* newline = reinterpret_cast<char*>(memchr(&buf[buf_start], '\n', buf_bytes));
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if (newline == nullptr) {
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break;
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}
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*newline = '\0';
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uintptr_t start, end;
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int name_pos;
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size_t native_rss_kB;
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if (sscanf(&buf[buf_start], "%" SCNxPTR "-%" SCNxPTR " %*4s %*x %*x:%*x %*d %n", &start, &end,
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&name_pos) == 2) {
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char* map_name = &buf[buf_start + name_pos];
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if (strcmp(map_name, "[anon:libc_malloc]") == 0 || strcmp(map_name, "[heap]") == 0 ||
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strncmp(map_name, "[anon:scudo:", 12) == 0 ||
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strncmp(map_name, "[anon:GWP-ASan", 14) == 0) {
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total_va_bytes += end - start;
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native_map = true;
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} else {
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native_map = false;
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}
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} else if (native_map && sscanf(&buf[buf_start], "Rss: %zu", &native_rss_kB) == 1) {
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total_rss_bytes += native_rss_kB * 1024;
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}
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buf_bytes -= newline - &buf[buf_start] + 1;
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buf_start = newline - buf + 1;
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}
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if (buf_start > 0) {
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if (buf_bytes > 0) {
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memmove(buf, &buf[buf_start], buf_bytes);
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}
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buf_start = 0;
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}
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}
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*rss_bytes = total_rss_bytes;
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*va_bytes = total_va_bytes;
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}
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void NativePrintInfo(const char* preamble) {
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size_t rss_bytes;
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size_t va_bytes;
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android::base::unique_fd smaps_fd(open("/proc/self/smaps", O_RDONLY));
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if (smaps_fd == -1) {
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err(1, "Cannot open /proc/self/smaps: %s\n", strerror(errno));
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}
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NativeGetInfo(smaps_fd, &rss_bytes, &va_bytes);
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// Avoid any allocations, so use special non-allocating printfs.
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char buffer[256];
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NativeFormatFloat(buffer, sizeof(buffer), rss_bytes, 1024 * 1024);
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NativePrintf("%sNative RSS: %zu bytes %sMB\n", preamble, rss_bytes, buffer);
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NativeFormatFloat(buffer, sizeof(buffer), va_bytes, 1024 * 1024);
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NativePrintf("%sNative VA Space: %zu bytes %sMB\n", preamble, va_bytes, buffer);
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}
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