--- a/src/hotspot/share/jfr/recorder/repository/jfrEmergencyDump.cpp Mon Mar 25 14:11:09 2019 +0100
+++ b/src/hotspot/share/jfr/recorder/repository/jfrEmergencyDump.cpp Mon Mar 25 15:37:06 2019 +0100
@@ -24,17 +24,315 @@
#include "precompiled.hpp"
#include "jfr/jfrEvents.hpp"
+#include "jfr/jni/jfrJavaSupport.hpp"
#include "jfr/leakprofiler/leakProfiler.hpp"
#include "jfr/recorder/repository/jfrEmergencyDump.hpp"
#include "jfr/recorder/service/jfrPostBox.hpp"
#include "jfr/recorder/service/jfrRecorderService.hpp"
#include "jfr/utilities/jfrTypes.hpp"
+#include "logging/log.hpp"
#include "memory/resourceArea.hpp"
#include "runtime/atomic.hpp"
#include "runtime/handles.inline.hpp"
#include "runtime/globals.hpp"
#include "runtime/mutexLocker.hpp"
-#include "runtime/thread.hpp"
+#include "runtime/os.hpp"
+#include "runtime/thread.inline.hpp"
+#include "utilities/growableArray.hpp"
+
+static const char vm_error_filename_fmt[] = "hs_err_pid%p.jfr";
+static const char vm_oom_filename_fmt[] = "hs_oom_pid%p.jfr";
+static const char vm_soe_filename_fmt[] = "hs_soe_pid%p.jfr";
+static const char chunk_file_jfr_ext[] = ".jfr";
+static const size_t iso8601_len = 19; // "YYYY-MM-DDTHH:MM:SS"
+
+static fio_fd open_exclusivly(const char* path) {
+ return os::open(path, O_CREAT | O_RDWR, S_IREAD | S_IWRITE);
+}
+
+static int file_sort(const char** const file1, const char** file2) {
+ assert(NULL != *file1 && NULL != *file2, "invariant");
+ int cmp = strncmp(*file1, *file2, iso8601_len);
+ if (0 == cmp) {
+ const char* const dot1 = strchr(*file1, '.');
+ assert(NULL != dot1, "invariant");
+ const char* const dot2 = strchr(*file2, '.');
+ assert(NULL != dot2, "invariant");
+ ptrdiff_t file1_len = dot1 - *file1;
+ ptrdiff_t file2_len = dot2 - *file2;
+ if (file1_len < file2_len) {
+ return -1;
+ }
+ if (file1_len > file2_len) {
+ return 1;
+ }
+ assert(file1_len == file2_len, "invariant");
+ cmp = strncmp(*file1, *file2, file1_len);
+ }
+ assert(cmp != 0, "invariant");
+ return cmp;
+}
+
+static void iso8601_to_date_time(char* iso8601_str) {
+ assert(iso8601_str != NULL, "invariant");
+ assert(strlen(iso8601_str) == iso8601_len, "invariant");
+ // "YYYY-MM-DDTHH:MM:SS"
+ for (size_t i = 0; i < iso8601_len; ++i) {
+ switch (iso8601_str[i]) {
+ case 'T':
+ case '-':
+ case ':':
+ iso8601_str[i] = '_';
+ break;
+ }
+ }
+ // "YYYY_MM_DD_HH_MM_SS"
+}
+
+static void date_time(char* buffer, size_t buffer_len) {
+ assert(buffer != NULL, "invariant");
+ assert(buffer_len >= iso8601_len, "buffer too small");
+ os::iso8601_time(buffer, buffer_len);
+ assert(strlen(buffer) >= iso8601_len + 1, "invariant");
+ // "YYYY-MM-DDTHH:MM:SS"
+ buffer[iso8601_len] = '\0';
+ iso8601_to_date_time(buffer);
+}
+
+static int64_t file_size(fio_fd fd) {
+ assert(fd != invalid_fd, "invariant");
+ const int64_t current_offset = os::current_file_offset(fd);
+ const int64_t size = os::lseek(fd, 0, SEEK_END);
+ os::seek_to_file_offset(fd, current_offset);
+ return size;
+}
+
+class RepositoryIterator : public StackObj {
+ private:
+ const char* const _repo;
+ const size_t _repository_len;
+ GrowableArray<const char*>* _files;
+ const char* const fully_qualified(const char* entry) const;
+ mutable int _iterator;
+
+ public:
+ RepositoryIterator(const char* repository, size_t repository_len);
+ ~RepositoryIterator() {}
+ const char* const filter(const char* entry) const;
+ bool has_next() const;
+ const char* const next() const;
+};
+
+const char* const RepositoryIterator::fully_qualified(const char* entry) const {
+ assert(NULL != entry, "invariant");
+ char* file_path_entry = NULL;
+ // only use files that have content, not placeholders
+ const char* const file_separator = os::file_separator();
+ if (NULL != file_separator) {
+ const size_t entry_len = strlen(entry);
+ const size_t file_separator_length = strlen(file_separator);
+ const size_t file_path_entry_length = _repository_len + file_separator_length + entry_len;
+ file_path_entry = NEW_RESOURCE_ARRAY_RETURN_NULL(char, file_path_entry_length + 1);
+ if (NULL == file_path_entry) {
+ return NULL;
+ }
+ int position = 0;
+ position += jio_snprintf(&file_path_entry[position], _repository_len + 1, "%s", _repo);
+ position += jio_snprintf(&file_path_entry[position], file_separator_length + 1, "%s", os::file_separator());
+ position += jio_snprintf(&file_path_entry[position], entry_len + 1, "%s", entry);
+ file_path_entry[position] = '\0';
+ assert((size_t)position == file_path_entry_length, "invariant");
+ assert(strlen(file_path_entry) == (size_t)position, "invariant");
+ }
+ return file_path_entry;
+}
+
+const char* const RepositoryIterator::filter(const char* entry) const {
+ if (entry == NULL) {
+ return NULL;
+ }
+ const size_t entry_len = strlen(entry);
+ if (entry_len <= 2) {
+ // for "." and ".."
+ return NULL;
+ }
+ char* entry_name = NEW_RESOURCE_ARRAY_RETURN_NULL(char, entry_len + 1);
+ if (entry_name == NULL) {
+ return NULL;
+ }
+ strncpy(entry_name, entry, entry_len + 1);
+ const char* const fully_qualified_path_entry = fully_qualified(entry_name);
+ if (NULL == fully_qualified_path_entry) {
+ return NULL;
+ }
+ const fio_fd entry_fd = open_exclusivly(fully_qualified_path_entry);
+ if (invalid_fd == entry_fd) {
+ return NULL;
+ }
+ const int64_t entry_size = file_size(entry_fd);
+ os::close(entry_fd);
+ if (0 == entry_size) {
+ return NULL;
+ }
+ return entry_name;
+}
+
+RepositoryIterator::RepositoryIterator(const char* repository, size_t repository_len) :
+ _repo(repository),
+ _repository_len(repository_len),
+ _files(NULL),
+ _iterator(0) {
+ if (NULL != _repo) {
+ assert(strlen(_repo) == _repository_len, "invariant");
+ _files = new GrowableArray<const char*>(10);
+ DIR* dirp = os::opendir(_repo);
+ if (dirp == NULL) {
+ log_error(jfr, system)("Unable to open repository %s", _repo);
+ return;
+ }
+ struct dirent* dentry;
+ while ((dentry = os::readdir(dirp)) != NULL) {
+ const char* const entry_path = filter(dentry->d_name);
+ if (NULL != entry_path) {
+ _files->append(entry_path);
+ }
+ }
+ os::closedir(dirp);
+ if (_files->length() > 1) {
+ _files->sort(file_sort);
+ }
+ }
+}
+
+bool RepositoryIterator::has_next() const {
+ return (_files != NULL && _iterator < _files->length());
+}
+
+const char* const RepositoryIterator::next() const {
+ return _iterator >= _files->length() ? NULL : fully_qualified(_files->at(_iterator++));
+}
+
+static void write_emergency_file(fio_fd emergency_fd, const RepositoryIterator& iterator) {
+ assert(emergency_fd != invalid_fd, "invariant");
+ const size_t size_of_file_copy_block = 1 * M; // 1 mb
+ jbyte* const file_copy_block = NEW_RESOURCE_ARRAY_RETURN_NULL(jbyte, size_of_file_copy_block);
+ if (file_copy_block == NULL) {
+ return;
+ }
+ while (iterator.has_next()) {
+ fio_fd current_fd = invalid_fd;
+ const char* const fqn = iterator.next();
+ if (fqn != NULL) {
+ current_fd = open_exclusivly(fqn);
+ if (current_fd != invalid_fd) {
+ const int64_t current_filesize = file_size(current_fd);
+ assert(current_filesize > 0, "invariant");
+ int64_t bytes_read = 0;
+ int64_t bytes_written = 0;
+ while (bytes_read < current_filesize) {
+ const ssize_t read_result = os::read_at(current_fd, file_copy_block, size_of_file_copy_block, bytes_read);
+ if (-1 == read_result) {
+ log_info(jfr)( // For user, should not be "jfr, system"
+ "Unable to recover JFR data");
+ break;
+ }
+ bytes_read += (int64_t)read_result;
+ assert(bytes_read - bytes_written <= (int64_t)size_of_file_copy_block, "invariant");
+ bytes_written += (int64_t)os::write(emergency_fd, file_copy_block, bytes_read - bytes_written);
+ assert(bytes_read == bytes_written, "invariant");
+ }
+ os::close(current_fd);
+ }
+ }
+ }
+}
+
+static const char* create_emergency_dump_path() {
+ assert(JfrStream_lock->owned_by_self(), "invariant");
+ char* buffer = NEW_RESOURCE_ARRAY_RETURN_NULL(char, JVM_MAXPATHLEN);
+ if (NULL == buffer) {
+ return NULL;
+ }
+ const char* const cwd = os::get_current_directory(buffer, JVM_MAXPATHLEN);
+ if (NULL == cwd) {
+ return NULL;
+ }
+ size_t pos = strlen(cwd);
+ const int fsep_len = jio_snprintf(&buffer[pos], JVM_MAXPATHLEN - pos, "%s", os::file_separator());
+ const char* filename_fmt = NULL;
+ // fetch specific error cause
+ switch (JfrJavaSupport::cause()) {
+ case JfrJavaSupport::OUT_OF_MEMORY:
+ filename_fmt = vm_oom_filename_fmt;
+ break;
+ case JfrJavaSupport::STACK_OVERFLOW:
+ filename_fmt = vm_soe_filename_fmt;
+ break;
+ default:
+ filename_fmt = vm_error_filename_fmt;
+ }
+ char* emergency_dump_path = NULL;
+ pos += fsep_len;
+ if (Arguments::copy_expand_pid(filename_fmt, strlen(filename_fmt), &buffer[pos], JVM_MAXPATHLEN - pos)) {
+ const size_t emergency_filename_length = strlen(buffer);
+ emergency_dump_path = NEW_RESOURCE_ARRAY_RETURN_NULL(char, emergency_filename_length + 1);
+ if (NULL == emergency_dump_path) {
+ return NULL;
+ }
+ strncpy(emergency_dump_path, buffer, emergency_filename_length + 1);
+ }
+ if (emergency_dump_path != NULL) {
+ log_info(jfr)( // For user, should not be "jfr, system"
+ "Attempting to recover JFR data, emergency jfr file: %s", emergency_dump_path);
+ }
+ return emergency_dump_path;
+}
+
+// Caller needs ResourceMark
+static const char* create_emergency_chunk_path(const char* repository_path) {
+ assert(repository_path != NULL, "invariant");
+ assert(JfrStream_lock->owned_by_self(), "invariant");
+ const size_t repository_path_len = strlen(repository_path);
+ // date time
+ char date_time_buffer[32] = { 0 };
+ date_time(date_time_buffer, sizeof(date_time_buffer));
+ size_t date_time_len = strlen(date_time_buffer);
+ size_t chunkname_max_len = repository_path_len // repository_base_path
+ + 1 // "/"
+ + date_time_len // date_time
+ + strlen(chunk_file_jfr_ext) // .jfr
+ + 1;
+ char* chunk_path = NEW_RESOURCE_ARRAY_RETURN_NULL(char, chunkname_max_len);
+ if (chunk_path == NULL) {
+ return NULL;
+ }
+ // append the individual substrings
+ jio_snprintf(chunk_path, chunkname_max_len, "%s%s%s%s", repository_path_len, os::file_separator(), date_time_buffer, chunk_file_jfr_ext);
+ return chunk_path;
+}
+
+static fio_fd emergency_dump_file_descriptor() {
+ assert(JfrStream_lock->owned_by_self(), "invariant");
+ ResourceMark rm;
+ const char* const emergency_dump_path = create_emergency_dump_path();
+ return emergency_dump_path != NULL ? open_exclusivly(emergency_dump_path) : invalid_fd;
+}
+
+const char* JfrEmergencyDump::build_dump_path(const char* repository_path) {
+ return repository_path == NULL ? create_emergency_dump_path() : create_emergency_chunk_path(repository_path);
+}
+
+void JfrEmergencyDump::on_vm_error(const char* repository_path) {
+ assert(repository_path != NULL, "invariant");
+ ResourceMark rm;
+ MutexLockerEx stream_lock(JfrStream_lock, Mutex::_no_safepoint_check_flag);
+ const fio_fd emergency_fd = emergency_dump_file_descriptor();
+ if (emergency_fd != invalid_fd) {
+ RepositoryIterator iterator(repository_path, strlen(repository_path));
+ write_emergency_file(emergency_fd, iterator);
+ os::close(emergency_fd);
+ }
+}
/*
* We are just about to exit the VM, so we will be very aggressive