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8243389: enhance os::pd_print_cpu_info on linux

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Reviewed-by: dholmes, mdoerr
This commit is contained in:
Matthias Baesken 2020-04-29 08:57:40 +02:00
parent 0de9bbd4f3
commit 60e2afe2d3
1 changed files with 56 additions and 0 deletions
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56
src/hotspot/os/linux/os_linux.cpp
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@ -2059,6 +2059,13 @@ static bool _print_ascii_file(const char* filename, outputStream* st, const char
return true;
}
static void _print_ascii_file_h(const char* header, const char* filename, outputStream* st) {
st->print("%s", header);
if (!_print_ascii_file(filename, st)) {
st->print_cr("<Not Available>");
}
}
void os::print_dll_info(outputStream *st) {
st->print_cr("Dynamic libraries:");
@ -2501,6 +2508,54 @@ static bool print_model_name_and_flags(outputStream* st, char* buf, size_t bufle
return false;
}
// 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);
if (ExtensiveErrorReports) {
// cache related info (cpu 0, should be similar for other CPUs)
for (unsigned int i=0; i < 10; i++) { // handle max. 10 cache entries
char hbuf_level[60];
char hbuf_type[60];
char hbuf_size[60];
char hbuf_coherency_line_size[80];
snprintf(hbuf_level, 60, "/sys/devices/system/cpu/cpu0/cache/index%u/level", i);
snprintf(hbuf_type, 60, "/sys/devices/system/cpu/cpu0/cache/index%u/type", i);
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);
}
}
}
// 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);
// 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);
}
// 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("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);
#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)) {
@ -2509,6 +2564,7 @@ void os::pd_print_cpu_info(outputStream* st, char* buf, size_t buflen) {
st->print_cr(" <Not Available>");
}
}
print_sys_devices_cpu_info(st, buf, buflen);
}
#if defined(AMD64) || defined(IA32) || defined(X32)