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8244196: adjust output in os_linux
Reviewed-by: dholmes, mdoerr
  • Loading branch information
MBaesken committed Apr 30, 2020
1 parent ca371c9 commit 463e377053c52eb3209839a9c88cc0dcc11bd965
Showing with 28 additions and 46 deletions.
  1. +28 −46 src/hotspot/os/linux/os_linux.cpp
@@ -2060,7 +2060,7 @@ static bool _print_ascii_file(const char* filename, outputStream* st, const char
}

static void _print_ascii_file_h(const char* header, const char* filename, outputStream* st) {
st->print("%s", header);
st->print_cr("%s:", header);
if (!_print_ascii_file(filename, st)) {
st->print_cr("<Not Available>");
}
@@ -2291,39 +2291,24 @@ void os::Linux::print_libversion_info(outputStream* st) {

void os::Linux::print_proc_sys_info(outputStream* st) {
st->cr();
st->print_cr("/proc/sys/kernel/threads-max (system-wide limit on the number of threads):");
_print_ascii_file("/proc/sys/kernel/threads-max", st);
st->cr();
st->cr();

st->print_cr("/proc/sys/vm/max_map_count (maximum number of memory map areas a process may have):");
_print_ascii_file("/proc/sys/vm/max_map_count", st);
st->cr();
st->cr();

st->print_cr("/proc/sys/kernel/pid_max (system-wide limit on number of process identifiers):");
_print_ascii_file("/proc/sys/kernel/pid_max", st);
st->cr();
st->cr();
_print_ascii_file_h("/proc/sys/kernel/threads-max (system-wide limit on the number of threads)",
"/proc/sys/kernel/threads-max", st);
_print_ascii_file_h("/proc/sys/vm/max_map_count (maximum number of memory map areas a process may have)",
"/proc/sys/vm/max_map_count", st);
_print_ascii_file_h("/proc/sys/kernel/pid_max (system-wide limit on number of process identifiers)",
"/proc/sys/kernel/pid_max", st);
}

void os::Linux::print_full_memory_info(outputStream* st) {
st->print("\n/proc/meminfo:\n");
_print_ascii_file("/proc/meminfo", st);
_print_ascii_file_h("\n/proc/meminfo", "/proc/meminfo", st);
st->cr();

// some information regarding THPs; for details see
// https://www.kernel.org/doc/Documentation/vm/transhuge.txt
st->print_cr("/sys/kernel/mm/transparent_hugepage/enabled:");
if (!_print_ascii_file("/sys/kernel/mm/transparent_hugepage/enabled", st)) {
st->print_cr(" <Not Available>");
}
st->cr();
st->print_cr("/sys/kernel/mm/transparent_hugepage/defrag (defrag/compaction efforts parameter):");
if (!_print_ascii_file("/sys/kernel/mm/transparent_hugepage/defrag", st)) {
st->print_cr(" <Not Available>");
}
st->cr();
_print_ascii_file_h("/sys/kernel/mm/transparent_hugepage/enabled",
"/sys/kernel/mm/transparent_hugepage/enabled", st);
_print_ascii_file_h("/sys/kernel/mm/transparent_hugepage/defrag (defrag/compaction efforts parameter)",
"/sys/kernel/mm/transparent_hugepage/defrag", st);
}

void os::Linux::print_ld_preload_file(outputStream* st) {
@@ -2510,8 +2495,8 @@ static bool print_model_name_and_flags(outputStream* st, char* buf, size_t bufle

// additional information about CPU e.g. available frequency ranges
static void print_sys_devices_cpu_info(outputStream* st, char* buf, size_t buflen) {
_print_ascii_file_h("Online cpus:", "/sys/devices/system/cpu/online", st);
_print_ascii_file_h("Offline cpus:", "/sys/devices/system/cpu/offline", st);
_print_ascii_file_h("Online cpus", "/sys/devices/system/cpu/online", st);
_print_ascii_file_h("Offline cpus", "/sys/devices/system/cpu/offline", st);

if (ExtensiveErrorReports) {
// cache related info (cpu 0, should be similar for other CPUs)
@@ -2525,44 +2510,41 @@ static void print_sys_devices_cpu_info(outputStream* st, char* buf, size_t bufle
snprintf(hbuf_size, 60, "/sys/devices/system/cpu/cpu0/cache/index%u/size", i);
snprintf(hbuf_coherency_line_size, 80, "/sys/devices/system/cpu/cpu0/cache/index%u/coherency_line_size", i);
if (file_exists(hbuf_level)) {
_print_ascii_file_h("cache level:", hbuf_level, st);
_print_ascii_file_h("cache type:", hbuf_type, st);
_print_ascii_file_h("cache size:", hbuf_size, st);
_print_ascii_file_h("cache coherency line size:", hbuf_coherency_line_size, st);
_print_ascii_file_h("cache level", hbuf_level, st);
_print_ascii_file_h("cache type", hbuf_type, st);
_print_ascii_file_h("cache size", hbuf_size, st);
_print_ascii_file_h("cache coherency line size", hbuf_coherency_line_size, st);
}
}
}

// we miss the cpufreq entries on Power and s390x
#if defined(IA32) || defined(AMD64)
_print_ascii_file_h("BIOS frequency limitation:", "/sys/devices/system/cpu/cpu0/cpufreq/bios_limit", st);
_print_ascii_file_h("Frequency switch latency (ns):", "/sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_transition_latency", st);
_print_ascii_file_h("Available cpu frequencies:", "/sys/devices/system/cpu/cpu0/cpufreq/scaling_available_frequencies", st);
_print_ascii_file_h("BIOS frequency limitation", "/sys/devices/system/cpu/cpu0/cpufreq/bios_limit", st);
_print_ascii_file_h("Frequency switch latency (ns)", "/sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_transition_latency", st);
_print_ascii_file_h("Available cpu frequencies", "/sys/devices/system/cpu/cpu0/cpufreq/scaling_available_frequencies", st);
// min and max should be in the Available range but still print them (not all info might be available for all kernels)
if (ExtensiveErrorReports) {
_print_ascii_file_h("Maximum cpu frequency:", "/sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_max_freq", st);
_print_ascii_file_h("Minimum cpu frequency:", "/sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_min_freq", st);
_print_ascii_file_h("Current cpu frequency:", "/sys/devices/system/cpu/cpu0/cpufreq/scaling_cur_freq", st);
_print_ascii_file_h("Maximum cpu frequency", "/sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_max_freq", st);
_print_ascii_file_h("Minimum cpu frequency", "/sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_min_freq", st);
_print_ascii_file_h("Current cpu frequency", "/sys/devices/system/cpu/cpu0/cpufreq/scaling_cur_freq", st);
}
// governors are power schemes, see https://wiki.archlinux.org/index.php/CPU_frequency_scaling
if (ExtensiveErrorReports) {
_print_ascii_file_h("Available governors:", "/sys/devices/system/cpu/cpu0/cpufreq/scaling_available_governors", st);
_print_ascii_file_h("Available governors", "/sys/devices/system/cpu/cpu0/cpufreq/scaling_available_governors", st);
}
_print_ascii_file_h("Current governor:", "/sys/devices/system/cpu/cpu0/cpufreq/scaling_governor", st);
_print_ascii_file_h("Current governor", "/sys/devices/system/cpu/cpu0/cpufreq/scaling_governor", st);
// Core performance boost, see https://www.kernel.org/doc/Documentation/cpu-freq/boost.txt
// Raise operating frequency of some cores in a multi-core package if certain conditions apply, e.g.
// whole chip is not fully utilized
_print_ascii_file_h("Core performance/turbo boost:", "/sys/devices/system/cpu/cpufreq/boost", st);
_print_ascii_file_h("Core performance/turbo boost", "/sys/devices/system/cpu/cpufreq/boost", st);
#endif
}

void os::pd_print_cpu_info(outputStream* st, char* buf, size_t buflen) {
// Only print the model name if the platform provides this as a summary
if (!print_model_name_and_flags(st, buf, buflen)) {
st->print("\n/proc/cpuinfo:\n");
if (!_print_ascii_file("/proc/cpuinfo", st)) {
st->print_cr(" <Not Available>");
}
_print_ascii_file_h("\n/proc/cpuinfo", "/proc/cpuinfo", st);
}
print_sys_devices_cpu_info(st, buf, buflen);
}

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