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/*
* Copyright (C) 2014 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <inttypes.h>
#include <stdarg.h>
#include <stdint.h>
#include <stdio.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
#include <android-base/unique_fd.h>
#include <async_safe/log.h>
#include "NativeInfo.h"
void NativePrintf(const char* fmt, ...) {
va_list args;
va_start(args, fmt);
char buffer[512];
int buffer_len = async_safe_format_buffer_va_list(buffer, sizeof(buffer), fmt, args);
va_end(args);
(void)write(STDOUT_FILENO, buffer, buffer_len);
}
void NativeFormatFloat(char* buffer, size_t buffer_len, uint64_t value, uint64_t divisor) {
uint64_t hundreds = ((((value % divisor) * 1000) / divisor) + 5) / 10;
async_safe_format_buffer(buffer, buffer_len, "%" PRIu64 ".%02" PRIu64, value / divisor, hundreds);
}
// This function is not re-entrant since it uses a static buffer for
// the line data.
void NativeGetInfo(int smaps_fd, size_t* rss_bytes, size_t* va_bytes) {
size_t total_rss_bytes = 0;
size_t total_va_bytes = 0;
bool native_map = false;
char buf[1024];
size_t buf_start = 0;
size_t buf_bytes = 0;
while (true) {
ssize_t bytes =
TEMP_FAILURE_RETRY(read(smaps_fd, buf + buf_bytes, sizeof(buf) - buf_bytes - 1));
if (bytes <= 0) {
break;
}
buf_bytes += bytes;
while (buf_bytes > 0) {
char* newline = reinterpret_cast<char*>(memchr(&buf[buf_start], '\n', buf_bytes));
if (newline == nullptr) {
break;
}
*newline = '\0';
uintptr_t start, end;
int name_pos;
size_t native_rss_kB;
if (sscanf(&buf[buf_start], "%" SCNxPTR "-%" SCNxPTR " %*4s %*x %*x:%*x %*d %n", &start, &end,
&name_pos) == 2) {
char* map_name = &buf[buf_start + name_pos];
if (strcmp(map_name, "[anon:libc_malloc]") == 0 || strcmp(map_name, "[heap]") == 0 ||
strncmp(map_name, "[anon:scudo:", 12) == 0) {
total_va_bytes += end - start;
native_map = true;
} else {
native_map = false;
}
} else if (native_map && sscanf(&buf[buf_start], "Rss: %zu", &native_rss_kB) == 1) {
total_rss_bytes += native_rss_kB * 1024;
}
buf_bytes -= newline - &buf[buf_start] + 1;
buf_start = newline - buf + 1;
}
if (buf_start > 0) {
if (buf_bytes > 0) {
memmove(buf, &buf[buf_start], buf_bytes);
}
buf_start = 0;
}
}
*rss_bytes = total_rss_bytes;
*va_bytes = total_va_bytes;
}
void NativePrintInfo(const char* preamble) {
size_t rss_bytes;
size_t va_bytes;
android::base::unique_fd smaps_fd(open("/proc/self/smaps", O_RDONLY));
if (smaps_fd == -1) {
err(1, "Cannot open /proc/self/smaps: %s\n", strerror(errno));
}
NativeGetInfo(smaps_fd, &rss_bytes, &va_bytes);
// Avoid any allocations, so use special non-allocating printfs.
char buffer[256];
NativeFormatFloat(buffer, sizeof(buffer), rss_bytes, 1024 * 1024);
NativePrintf("%sNative RSS: %zu bytes %sMB\n", preamble, rss_bytes, buffer);
NativeFormatFloat(buffer, sizeof(buffer), va_bytes, 1024 * 1024);
NativePrintf("%sNative VA Space: %zu bytes %sMB\n", preamble, va_bytes, buffer);
}
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