Squash merge of MDC logging changes.

1 files changed, 1365 insertions, 0 deletions

diff --git a/src/H5Clog_json.c b/src/H5Clog_json.c
new file mode 100644
index 0000000..c1ede75
--- /dev/null
+++ b/src/H5Clog_json.c
@@ -0,0 +1,1365 @@
+/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
+ * Copyright by The HDF Group.                                               *
+ * Copyright by the Board of Trustees of the University of Illinois.         *
+ * All rights reserved.                                                      *
+ *                                                                           *
+ * This file is part of HDF5.  The full HDF5 copyright notice, including     *
+ * terms governing use, modification, and redistribution, is contained in    *
+ * the COPYING file, which can be found at the root of the source code       *
+ * distribution tree, or in https://support.hdfgroup.org/ftp/HDF5/releases.  *
+ * If you do not have access to either file, you may request a copy from     *
+ * help@hdfgroup.org.                                                        *
+ * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
+
+/*-------------------------------------------------------------------------
+ *
+ * Created:     H5Clog_json.c
+ *
+ * Purpose:     Cache log implementation that emits JSON-formatted log
+ *              entries for consumption by new-fangled data analysis tools.
+ *
+ *-------------------------------------------------------------------------
+ */
+
+/****************/
+/* Module Setup */
+/****************/
+#include "H5Cmodule.h"         /* This source code file is part of the H5C module */
+
+/***********/
+/* Headers */
+/***********/
+#include "H5private.h"          /* Generic Functions                        */
+#include "H5Cpkg.h"             /* Cache                                    */
+#include "H5Clog.h"             /* Cache logging                            */
+#include "H5Eprivate.h"         /* Error handling                           */
+#include "H5MMprivate.h"        /* Memory management                        */
+
+
+/****************/
+/* Local Macros */
+/****************/
+
+/* Max log message size */
+#define H5C_MAX_JSON_LOG_MSG_SIZE 128
+
+
+/******************/
+/* Local Typedefs */
+/******************/
+
+
+/********************/
+/* Package Typedefs */
+/********************/
+
+typedef struct H5C_log_json_udata_t {
+    FILE *outfile;
+    char *message;
+} H5C_log_json_udata_t;
+
+
+/********************/
+/* Local Prototypes */
+/********************/
+
+/* Internal message handling calls */
+static herr_t H5C__json_write_log_message(H5C_log_json_udata_t *json_udata);
+
+/* Log message callbacks */
+static herr_t H5C__json_tear_down_logging(H5C_log_info_t *log_info);
+static herr_t H5C__json_write_start_log_msg(void *udata);
+static herr_t H5C__json_write_stop_log_msg(void *udata);
+static herr_t H5C__json_write_create_cache_log_msg(void *udata, herr_t fxn_ret_value);
+static herr_t H5C__json_write_destroy_cache_log_msg(void *udata);
+static herr_t H5C__json_write_evict_cache_log_msg(void *udata, herr_t fxn_ret_value);
+static herr_t H5C__json_write_expunge_entry_log_msg(void *udata, haddr_t address, int type_id, herr_t fxn_ret_value);
+static herr_t H5C__json_write_flush_cache_log_msg(void *udata, herr_t fxn_ret_value);
+static herr_t H5C__json_write_insert_entry_log_msg(void *udata, haddr_t address, int type_id, unsigned flags, size_t size, herr_t fxn_ret_value);
+static herr_t H5C__json_write_mark_entry_dirty_log_msg(void *udata, const H5C_cache_entry_t *entry, herr_t fxn_ret_value);
+static herr_t H5C__json_write_mark_entry_clean_log_msg(void *udata, const H5C_cache_entry_t *entry, herr_t fxn_ret_value);
+static herr_t H5C__json_write_mark_unserialized_entry_log_msg(void *udata, const H5C_cache_entry_t *entry, herr_t fxn_ret_value);
+static herr_t H5C__json_write_mark_serialized_entry_log_msg(void *udata, const H5C_cache_entry_t *entry, herr_t fxn_ret_value);
+static herr_t H5C__json_write_move_entry_log_msg(void *udata, haddr_t old_addr, haddr_t new_addr, int type_id, herr_t fxn_ret_value);
+static herr_t H5C__json_write_pin_entry_log_msg(void *udata, const H5C_cache_entry_t *entry, herr_t fxn_ret_value);
+static herr_t H5C__json_write_create_fd_log_msg(void *udata, const H5C_cache_entry_t *parent, const H5C_cache_entry_t *child, herr_t fxn_ret_value);
+static herr_t H5C__json_write_protect_entry_log_msg(void *udata, const H5C_cache_entry_t *entry, int type_id, unsigned flags, herr_t fxn_ret_value);
+static herr_t H5C__json_write_resize_entry_log_msg(void *udata, const H5C_cache_entry_t *entry, size_t new_size, herr_t fxn_ret_value);
+static herr_t H5C__json_write_unpin_entry_log_msg(void *udata, const H5C_cache_entry_t *entry, herr_t fxn_ret_value);
+static herr_t H5C__json_write_destroy_fd_log_msg(void *udata, const H5C_cache_entry_t *parent, const H5C_cache_entry_t *child, herr_t fxn_ret_value);
+static herr_t H5C__json_write_unprotect_entry_log_msg(void *udata, const H5C_cache_entry_t *entry, int type_id, unsigned flags, herr_t fxn_ret_value);
+static herr_t H5C__json_write_set_cache_config_log_msg(void *udata, const H5AC_cache_config_t *config, herr_t fxn_ret_value);
+static herr_t H5C__json_write_remove_entry_log_msg(void *udata, const H5C_cache_entry_t *entry, herr_t fxn_ret_value);
+
+
+/*********************/
+/* Package Variables */
+/*********************/
+
+
+/*****************************/
+/* Library Private Variables */
+/*****************************/
+
+
+/*******************/
+/* Local Variables */
+/*******************/
+
+/* Note that there's no cache set up call since that's the
+ * place where this struct is wired into the cache.
+ */
+static H5C_log_class_t H5C_json_log_class_g = {
+    "json",
+    H5C__json_tear_down_logging,
+    NULL,                               /* start logging */
+    NULL,                               /* stop logging */
+    H5C__json_write_start_log_msg,
+    H5C__json_write_stop_log_msg,
+    H5C__json_write_create_cache_log_msg,
+    H5C__json_write_destroy_cache_log_msg,
+    H5C__json_write_evict_cache_log_msg,
+    H5C__json_write_expunge_entry_log_msg,
+    H5C__json_write_flush_cache_log_msg,
+    H5C__json_write_insert_entry_log_msg,
+    H5C__json_write_mark_entry_dirty_log_msg,
+    H5C__json_write_mark_entry_clean_log_msg,
+    H5C__json_write_mark_unserialized_entry_log_msg,
+    H5C__json_write_mark_serialized_entry_log_msg,
+    H5C__json_write_move_entry_log_msg,
+    H5C__json_write_pin_entry_log_msg,
+    H5C__json_write_create_fd_log_msg,
+    H5C__json_write_protect_entry_log_msg,
+    H5C__json_write_resize_entry_log_msg,
+    H5C__json_write_unpin_entry_log_msg,
+    H5C__json_write_destroy_fd_log_msg,
+    H5C__json_write_unprotect_entry_log_msg,
+    H5C__json_write_set_cache_config_log_msg,
+    H5C__json_write_remove_entry_log_msg
+};
+
+
+
+/*-------------------------------------------------------------------------
+ * Function:    H5C__json_write_log_message
+ *
+ * Purpose:     Write a message to the log file and flush the file. 
+ *              The message string is neither modified nor freed.
+ *
+ * Return:      SUCCEED/FAIL
+ *
+ * Programmer:  Dana Robinson
+ *              Fall 2018
+ *
+ *-------------------------------------------------------------------------
+ */
+static herr_t
+H5C__json_write_log_message(H5C_log_json_udata_t *json_udata)
+{
+    size_t n_chars;
+    herr_t ret_value = SUCCEED;      /* Return value */
+
+    FUNC_ENTER_STATIC
+
+    /* Sanity checks */
+    HDassert(json_udata);
+    HDassert(json_udata->outfile);
+    HDassert(json_udata->message);
+
+    /* Write the log message and flush */
+    n_chars = HDstrlen(json_udata->message);
+    if((int)n_chars != HDfprintf(json_udata->outfile, json_udata->message))
+        HGOTO_ERROR(H5E_CACHE, H5E_LOGGING, FAIL, "error writing log message")
+    HDmemset((void *)(json_udata->message), 0, (size_t)(n_chars * sizeof(char)));
+            
+done:
+    FUNC_LEAVE_NOAPI(ret_value)
+} /* H5C__json_write_log_message() */
+
+
+/*-------------------------------------------------------------------------
+ * Function:    H5C_json_set_up_logging
+ *
+ * Purpose:     Setup for metadata cache logging.
+ *
+ *              Metadata logging is enabled and disabled at two levels. This
+ *              function and the associated tear_down function open and close
+ *              the log file. the start_ and stop_logging functions are then
+ *              used to switch logging on/off. Optionally, logging can begin
+ *              as soon as the log file is opened (set via the start_immediately
+ *              parameter to this function).
+ *
+ *              The log functionality is split between the H5C and H5AC
+ *              packages. Log state and direct log manipulation resides in
+ *              H5C. Log messages are generated in H5AC and sent to
+ *              the H5C__json_write_log_message function.
+ *
+ * Return:      SUCCEED/FAIL
+ *
+ * Programmer:  Dana Robinson
+ *              Fall 2018
+ *
+ *-------------------------------------------------------------------------
+ */
+herr_t
+H5C_json_set_up_logging(H5C_log_info_t *log_info, const char log_location[], int mpi_rank)
+{
+    H5C_log_json_udata_t *json_udata = NULL;
+    char *file_name = NULL;
+    size_t n_chars;
+    herr_t ret_value = SUCCEED;      /* Return value */
+
+    FUNC_ENTER_NOAPI(FAIL)
+
+    /* Sanity checks */
+    HDassert(log_info);
+    HDassert(log_location);
+
+    /* Set up the class struct */
+    log_info->cls = &H5C_json_log_class_g;
+
+    /* Allocate memory for the JSON-specific data */
+    if(NULL == (log_info->udata = H5MM_calloc(sizeof(H5C_log_json_udata_t))))
+        HGOTO_ERROR(H5E_CACHE, H5E_CANTALLOC, FAIL, "memory allocation failed")
+    json_udata = (H5C_log_json_udata_t *)(log_info->udata);
+    
+    /* Allocate memory for the message buffer */
+    if(NULL == (json_udata->message = (char *)H5MM_calloc(H5C_MAX_JSON_LOG_MSG_SIZE * sizeof(char))))
+        HGOTO_ERROR(H5E_CACHE, H5E_CANTALLOC, FAIL, "memory allocation failed")
+
+    /* Possibly fix up the log file name.
+     * The extra 39 characters are for adding the rank to the file name
+     * under parallel HDF5. 39 characters allows > 2^127 processes which
+     * should be enough for anybody.
+     *
+     * allocation size = "RANK_" + <rank # length> + dot + <path length> + \0
+     */
+    n_chars = 5 + 39 + 1 + HDstrlen(log_location) + 1;
+    if(NULL == (file_name = (char *)H5MM_calloc(n_chars * sizeof(char))))
+        HGOTO_ERROR(H5E_CACHE, H5E_CANTALLOC, FAIL, "can't allocate memory for mdc log file name manipulation")
+
+    /* Add the rank to the log file name when MPI is in use */
+    if(-1 == mpi_rank)
+        HDsnprintf(file_name, n_chars, "%s", log_location);
+    else
+        HDsnprintf(file_name, n_chars, "RANK_%d.%s", mpi_rank, log_location);
+
+    /* Open log file and set it to be unbuffered */
+    if(NULL == (json_udata->outfile = HDfopen(file_name, "w")))
+        HGOTO_ERROR(H5E_CACHE, H5E_LOGGING, FAIL, "can't create mdc log file")
+    HDsetbuf(json_udata->outfile, NULL);
+
+ done:
+    if(file_name)
+        H5MM_xfree(file_name);
+
+    /* Free and reset the log info struct on errors */
+    if(FAIL == ret_value) {
+        /* Free */
+        if(json_udata && json_udata->message)
+            H5MM_xfree(json_udata->message);
+        if(json_udata)
+            H5MM_xfree(json_udata);
+
+        /* Reset */
+        log_info->udata = NULL;
+        log_info->cls = NULL;
+    }
+
+    FUNC_LEAVE_NOAPI(ret_value)
+} /* H5C_json_set_up_logging() */
+
+
+/*-------------------------------------------------------------------------
+ * Function:    H5C__json_tear_down_logging
+ *
+ * Purpose:     Tear-down for metadata cache logging.
+ *
+ * Return:      SUCCEED/FAIL
+ *
+ * Programmer:  Dana Robinson
+ *              Fall 2018
+ *
+ *-------------------------------------------------------------------------
+ */
+static herr_t
+H5C__json_tear_down_logging(H5C_log_info_t *log_info)
+{
+    H5C_log_json_udata_t *json_udata = NULL;
+    herr_t ret_value = SUCCEED;      /* Return value */
+
+    FUNC_ENTER_STATIC
+
+    /* Sanity checks */
+    HDassert(log_info);
+
+    /* Alias */
+    json_udata = (H5C_log_json_udata_t *)(log_info->udata);
+
+    /* Free the message buffer */
+    H5MM_xfree(json_udata->message);
+
+    /* Close log file */
+    if(EOF == HDfclose(json_udata->outfile))
+        HGOTO_ERROR(H5E_CACHE, H5E_LOGGING, FAIL, "problem closing mdc log file")
+    json_udata->outfile = NULL;
+
+    /* Fre the udata */
+    H5MM_xfree(json_udata);
+
+    /* Reset the log class info and udata */
+    log_info->cls = NULL;
+    log_info->udata = NULL;
+
+ done:
+    FUNC_LEAVE_NOAPI(ret_value)
+} /* H5C__json_tear_down_logging() */
+
+
+/*-------------------------------------------------------------------------
+ * Function:    H5C__json_write_start_log_msg
+ *
+ * Purpose:     Write a log message when logging starts.
+ *
+ * Return:      SUCCEED/FAIL
+ *
+ * Programmer:  Dana Robinson
+ *              Fall 2018
+ *
+ *-------------------------------------------------------------------------
+ */
+static herr_t
+H5C__json_write_start_log_msg(void *udata)
+{
+    H5C_log_json_udata_t *json_udata = (H5C_log_json_udata_t *)(udata);
+    herr_t ret_value = SUCCEED;         /* Return value */
+
+    FUNC_ENTER_STATIC
+
+    /* Sanity checks */
+    HDassert(json_udata);
+    HDassert(json_udata->message);
+
+    /* Create the log message string (opens the JSON array) */
+    HDsnprintf(json_udata->message, H5C_MAX_JSON_LOG_MSG_SIZE, 
+"\
+{\n\
+\"HDF5 metadata cache log messages\" : [\n\
+{\
+\"timestamp\":%lld,\
+\"action\":\"logging start\"\
+},\n\
+"
+    , (long long)HDtime(NULL));
+
+    /* Write the log message to the file */
+    if(H5C__json_write_log_message(json_udata) < 0)
+        HGOTO_ERROR(H5E_CACHE, H5E_LOGGING, FAIL, "unable to emit log message")
+
+done:
+    FUNC_LEAVE_NOAPI(ret_value)
+} /* H5C__json_write_start_log_msg() */
+
+
+/*-------------------------------------------------------------------------
+ * Function:    H5C__json_write_stop_log_msg
+ *
+ * Purpose:     Write a log message when logging ends.
+ *
+ * Return:      SUCCEED/FAIL
+ *
+ * Programmer:  Dana Robinson
+ *              Fall 2018
+ *
+ *-------------------------------------------------------------------------
+ */
+static herr_t
+H5C__json_write_stop_log_msg(void *udata)
+{
+    H5C_log_json_udata_t *json_udata = (H5C_log_json_udata_t *)(udata);
+    herr_t ret_value = SUCCEED;         /* Return value */
+
+    FUNC_ENTER_STATIC
+
+    /* Sanity checks */
+    HDassert(json_udata);
+    HDassert(json_udata->message);
+
+    /* Create the log message string (closes the JSON array) */
+    HDsnprintf(json_udata->message, H5C_MAX_JSON_LOG_MSG_SIZE, 
+"\
+{\
+\"timestamp\":%lld,\
+\"action\":\"logging stop\"\
+}\n\
+]}\n\
+"
+    , (long long)HDtime(NULL));
+
+    /* Write the log message to the file */
+    if(H5C__json_write_log_message(json_udata) < 0)
+        HGOTO_ERROR(H5E_CACHE, H5E_LOGGING, FAIL, "unable to emit log message")
+ 
+done:
+    FUNC_LEAVE_NOAPI(ret_value)
+} /* H5C__json_write_stop_log_msg() */
+
+
+/*-------------------------------------------------------------------------
+ * Function:    H5C__json_write_create_cache_log_msg
+ *
+ * Purpose:     Write a log message for cache creation.
+ *
+ * Return:      SUCCEED/FAIL
+ *
+ * Programmer:  Dana Robinson
+ *              Fall 2018
+ *
+ *-------------------------------------------------------------------------
+ */
+static herr_t
+H5C__json_write_create_cache_log_msg(void *udata, herr_t fxn_ret_value) 
+{
+    H5C_log_json_udata_t *json_udata = (H5C_log_json_udata_t *)(udata);
+    herr_t ret_value = SUCCEED;         /* Return value */
+
+    FUNC_ENTER_STATIC
+
+    /* Sanity checks */
+    HDassert(json_udata);
+    HDassert(json_udata->message);
+
+    /* Create the log message string */
+    HDsnprintf(json_udata->message, H5C_MAX_JSON_LOG_MSG_SIZE, 
+"\
+{\
+\"timestamp\":%lld,\
+\"action\":\"create\",\
+\"returned\":%d\
+},\n\
+"
+    , (long long)HDtime(NULL), (int)fxn_ret_value);
+
+    /* Write the log message to the file */
+    if(H5C__json_write_log_message(json_udata) < 0)
+        HGOTO_ERROR(H5E_CACHE, H5E_LOGGING, FAIL, "unable to emit log message")
+
+done:
+    FUNC_LEAVE_NOAPI(ret_value)
+} /* H5C__json_write_create_cache_log_msg() */
+
+
+/*-------------------------------------------------------------------------
+ * Function:    H5C__json_write_destroy_cache_log_msg
+ *
+ * Purpose:     Write a log message for cache destruction.
+ *
+ * Return:      SUCCEED/FAIL
+ *
+ * Programmer:  Dana Robinson
+ *              Fall 2018
+ *
+ *-------------------------------------------------------------------------
+ */
+static herr_t
+H5C__json_write_destroy_cache_log_msg(void *udata)
+{
+    H5C_log_json_udata_t *json_udata = (H5C_log_json_udata_t *)(udata);
+    herr_t ret_value = SUCCEED;         /* Return value */
+
+    FUNC_ENTER_STATIC
+
+    /* Sanity checks */
+    HDassert(json_udata);
+    HDassert(json_udata->message);
+
+    /* Create the log message string */
+    HDsnprintf(json_udata->message, H5C_MAX_JSON_LOG_MSG_SIZE, 
+"\
+{\
+\"timestamp\":%lld,\
+\"action\":\"destroy\"\
+},\n\
+"
+    , (long long)HDtime(NULL));
+
+    /* Write the log message to the file */
+    if(H5C__json_write_log_message(json_udata) < 0)
+        HGOTO_ERROR(H5E_CACHE, H5E_LOGGING, FAIL, "unable to emit log message")
+
+done:
+    FUNC_LEAVE_NOAPI(ret_value)
+} /* H5C__json_write_destroy_cache_log_msg() */
+
+
+/*-------------------------------------------------------------------------
+ * Function:    H5C__json_write_evict_cache_log_msg
+ *
+ * Purpose:     Write a log message for eviction of cache entries.
+ *
+ * Return:      SUCCEED/FAIL
+ *
+ * Programmer:  Dana Robinson
+ *              Fall 2018
+ *
+ *-------------------------------------------------------------------------
+ */
+static herr_t
+H5C__json_write_evict_cache_log_msg(void *udata, herr_t fxn_ret_value)
+{
+    H5C_log_json_udata_t *json_udata = (H5C_log_json_udata_t *)(udata);
+    herr_t ret_value = SUCCEED;
+
+    FUNC_ENTER_STATIC
+
+    /* Sanity checks */
+    HDassert(json_udata);
+    HDassert(json_udata->message);
+
+    /* Create the log message string */
+    HDsnprintf(json_udata->message, H5C_MAX_JSON_LOG_MSG_SIZE, 
+"\
+{\
+\"timestamp\":%lld,\
+\"action\":\"evict\",\
+\"returned\":%d\
+},\n\
+"
+    , (long long)HDtime(NULL), (int)fxn_ret_value);
+
+    /* Write the log message to the file */
+    if(H5C__json_write_log_message(json_udata) < 0)
+        HGOTO_ERROR(H5E_CACHE, H5E_LOGGING, FAIL, "unable to emit log message")
+
+done:
+    FUNC_LEAVE_NOAPI(ret_value)
+} /* H5C__json_write_evict_cache_log_msg() */
+
+
+/*-------------------------------------------------------------------------
+ * Function:    H5C__json_write_expunge_entry_log_msg
+ *
+ * Purpose:     Write a log message for expunge of cache entries.
+ *
+ * Return:      SUCCEED/FAIL
+ *
+ * Programmer:  Dana Robinson
+ *              Fall 2018
+ *
+ *-------------------------------------------------------------------------
+ */
+static herr_t
+H5C__json_write_expunge_entry_log_msg(void *udata, haddr_t address,
+    int type_id, herr_t fxn_ret_value)
+{
+    H5C_log_json_udata_t *json_udata = (H5C_log_json_udata_t *)(udata);
+    herr_t ret_value = SUCCEED;
+
+    FUNC_ENTER_STATIC
+
+    /* Sanity checks */
+    HDassert(json_udata);
+    HDassert(json_udata->message);
+
+    /* Create the log message string */
+    HDsnprintf(json_udata->message, H5C_MAX_JSON_LOG_MSG_SIZE, 
+"\
+{\
+\"timestamp\":%lld,\
+\"action\":\"expunge\",\
+\"address\":0x%lx,\
+\"type_id\":%d,\
+\"returned\":%d\
+},\n\
+"
+    , (long long)HDtime(NULL), (unsigned long)address, (int)type_id, (int)fxn_ret_value);
+
+
+    /* Write the log message to the file */
+    if(H5C__json_write_log_message(json_udata) < 0)
+        HGOTO_ERROR(H5E_CACHE, H5E_LOGGING, FAIL, "unable to emit log message")
+
+done:
+    FUNC_LEAVE_NOAPI(ret_value)
+} /* H5C__json_write_expunge_entry_log_msg() */
+
+
+/*-------------------------------------------------------------------------
+ * Function:    H5C__json_write_flush_cache_log_msg
+ *
+ * Purpose:     Write a log message for cache flushes.
+ *
+ * Return:      SUCCEED/FAIL
+ *
+ * Programmer:  Dana Robinson
+ *              Fall 2018
+ *
+ *-------------------------------------------------------------------------
+ */
+static herr_t
+H5C__json_write_flush_cache_log_msg(void *udata, herr_t fxn_ret_value)
+{
+    H5C_log_json_udata_t *json_udata = (H5C_log_json_udata_t *)(udata);
+    herr_t ret_value = SUCCEED;
+
+    FUNC_ENTER_STATIC
+
+    /* Sanity checks */
+    HDassert(json_udata);
+    HDassert(json_udata->message);
+
+    /* Create the log message string */
+    HDsnprintf(json_udata->message, H5C_MAX_JSON_LOG_MSG_SIZE, 
+"\
+{\
+\"timestamp\":%lld,\
+\"action\":\"flush\",\
+\"returned\":%d\
+},\n\
+"
+    , (long long)HDtime(NULL), (int)fxn_ret_value);
+
+    /* Write the log message to the file */
+    if(H5C__json_write_log_message(json_udata) < 0)
+        HGOTO_ERROR(H5E_CACHE, H5E_LOGGING, FAIL, "unable to emit log message")
+
+done:
+    FUNC_LEAVE_NOAPI(ret_value)
+} /* H5C__json_write_flush_cache_log_msg() */
+
+
+/*-------------------------------------------------------------------------
+ * Function:    H5C__json_write_insert_entry_log_msg
+ *
+ * Purpose:     Write a log message for insertion of cache entries.
+ *
+ * Return:      SUCCEED/FAIL
+ *
+ * Programmer:  Dana Robinson
+ *              Fall 2018
+ *
+ *-------------------------------------------------------------------------
+ */
+static herr_t
+H5C__json_write_insert_entry_log_msg(void *udata, haddr_t address,
+    int type_id, unsigned flags, size_t size, herr_t fxn_ret_value)
+{
+    H5C_log_json_udata_t *json_udata = (H5C_log_json_udata_t *)(udata);
+    herr_t ret_value = SUCCEED;
+
+    FUNC_ENTER_STATIC
+
+    /* Sanity checks */
+    HDassert(json_udata);
+    HDassert(json_udata->message);
+
+    /* Create the log message string */
+    HDsnprintf(json_udata->message, H5C_MAX_JSON_LOG_MSG_SIZE, 
+"\
+{\
+\"timestamp\":%lld,\
+\"action\":\"insert\",\
+\"address\":0x%lx,\
+\"type_id\":%d,\
+\"flags\":0x%x,\
+\"size\":%d,\
+\"returned\":%d\
+},\n\
+"
+    , (long long)HDtime(NULL), (unsigned long)address, type_id, flags,
+      (int)size, (int)fxn_ret_value);
+
+    /* Write the log message to the file */
+    if(H5C__json_write_log_message(json_udata) < 0)
+        HGOTO_ERROR(H5E_CACHE, H5E_LOGGING, FAIL, "unable to emit log message")
+
+done:
+    FUNC_LEAVE_NOAPI(ret_value)
+} /* H5C__json_write_insert_entry_log_msg() */
+
+
+/*-------------------------------------------------------------------------
+ * Function:    H5C__json_write_mark_entry_dirty_log_msg
+ *
+ * Purpose:     Write a log message for marking cache entries as dirty.
+ *
+ * Return:      SUCCEED/FAIL
+ *
+ * Programmer:  Dana Robinson
+ *              Fall 2018
+ *
+ *-------------------------------------------------------------------------
+ */
+static herr_t
+H5C__json_write_mark_entry_dirty_log_msg(void *udata, const H5C_cache_entry_t *entry,
+    herr_t fxn_ret_value)
+{
+    H5C_log_json_udata_t *json_udata = (H5C_log_json_udata_t *)(udata);
+    herr_t ret_value = SUCCEED;
+
+    FUNC_ENTER_STATIC
+
+    /* Sanity checks */
+    HDassert(json_udata);
+    HDassert(json_udata->message);
+    HDassert(entry);
+
+    /* Create the log message string */
+    HDsnprintf(json_udata->message, H5C_MAX_JSON_LOG_MSG_SIZE, 
+"\
+{\
+\"timestamp\":%lld,\
+\"action\":\"dirty\",\
+\"address\":0x%lx,\
+\"returned\":%d\
+},\n\
+"
+    , (long long)HDtime(NULL), (unsigned long)entry->addr, (int)fxn_ret_value);
+
+    /* Write the log message to the file */
+    if(H5C__json_write_log_message(json_udata) < 0)
+        HGOTO_ERROR(H5E_CACHE, H5E_LOGGING, FAIL, "unable to emit log message")
+
+done:
+    FUNC_LEAVE_NOAPI(ret_value)
+} /* H5C__json_write_mark_entry_dirty_log_msg() */
+
+
+/*-------------------------------------------------------------------------
+ * Function:    H5C__json_write_mark_entry_clean_log_msg
+ *
+ * Purpose:     Write a log message for marking cache entries as clean.
+ *
+ * Return:      SUCCEED/FAIL
+ *
+ * Programmer:  Dana Robinson
+ *              Fall 2018
+ *
+ *-------------------------------------------------------------------------
+ */
+static herr_t
+H5C__json_write_mark_entry_clean_log_msg(void *udata, const H5C_cache_entry_t *entry,
+    herr_t fxn_ret_value)
+{
+    H5C_log_json_udata_t *json_udata = (H5C_log_json_udata_t *)(udata);
+    herr_t ret_value = SUCCEED;         /* Return value */
+
+    FUNC_ENTER_STATIC
+
+    /* Sanity checks */
+    HDassert(json_udata);
+    HDassert(json_udata->message);
+    HDassert(entry);
+
+    /* Create the log message string */
+    HDsnprintf(json_udata->message, H5C_MAX_JSON_LOG_MSG_SIZE, 
+"\
+{\
+\"timestamp\":%lld,\
+\"action\":\"clean\",\
+\"address\":0x%lx,\
+\"returned\":%d\
+},\n\
+"
+    , (long long)HDtime(NULL), (unsigned long)entry->addr, (int)fxn_ret_value);
+
+    /* Write the log message to the file */
+    if(H5C__json_write_log_message(json_udata) < 0)
+        HGOTO_ERROR(H5E_CACHE, H5E_LOGGING, FAIL, "unable to emit log message")
+
+done:
+    FUNC_LEAVE_NOAPI(ret_value)
+} /* H5C__json_write_mark_entry_clean_log_msg() */
+
+
+/*-------------------------------------------------------------------------
+ * Function:    H5C__json_write_mark_unserialized_entry_log_msg
+ *
+ * Purpose:     Write a log message for marking cache entries as unserialized.
+ *
+ * Return:      SUCCEED/FAIL
+ *
+ * Programmer:  Dana Robinson
+ *              Fall 2018
+ *
+ *-------------------------------------------------------------------------
+ */
+static herr_t
+H5C__json_write_mark_unserialized_entry_log_msg(void *udata,
+    const H5C_cache_entry_t *entry, herr_t fxn_ret_value)
+{
+    H5C_log_json_udata_t *json_udata = (H5C_log_json_udata_t *)(udata);
+    herr_t ret_value = SUCCEED;
+
+    FUNC_ENTER_STATIC
+
+    /* Sanity checks */
+    HDassert(json_udata);
+    HDassert(json_udata->message);
+    HDassert(entry);
+
+    /* Create the log message string */
+    HDsnprintf(json_udata->message, H5C_MAX_JSON_LOG_MSG_SIZE, 
+"\
+{\
+\"timestamp\":%lld,\
+\"action\":\"unserialized\",\
+\"address\":0x%lx,\
+\"returned\":%d\
+},\n\
+"
+    , (long long)HDtime(NULL), (unsigned long)entry->addr, (int)fxn_ret_value);
+
+    /* Write the log message to the file */
+    if(H5C__json_write_log_message(json_udata) < 0)
+        HGOTO_ERROR(H5E_CACHE, H5E_LOGGING, FAIL, "unable to emit log message")
+
+done:
+    FUNC_LEAVE_NOAPI(ret_value)
+} /* H5C__json_write_mark_unserialized_entry_log_msg() */
+
+
+/*-------------------------------------------------------------------------
+ * Function:    H5C__json_write_mark_serialize_entry_log_msg
+ *
+ * Purpose:     Write a log message for marking cache entries as serialize.
+ *
+ * Return:      SUCCEED/FAIL
+ *
+ * Programmer:  Dana Robinson
+ *              Fall 2018
+ *
+ *-------------------------------------------------------------------------
+ */
+static herr_t
+H5C__json_write_mark_serialized_entry_log_msg(void *udata, const H5C_cache_entry_t *entry,
+    herr_t fxn_ret_value)
+{
+    H5C_log_json_udata_t *json_udata = (H5C_log_json_udata_t *)(udata);
+    herr_t ret_value = SUCCEED;         /* Return value */
+
+    FUNC_ENTER_STATIC
+
+    /* Sanity checks */
+    HDassert(json_udata);
+    HDassert(json_udata->message);
+    HDassert(entry);
+
+    /* Create the log message string */
+    HDsnprintf(json_udata->message, H5C_MAX_JSON_LOG_MSG_SIZE, 
+"\
+{\
+\"timestamp\":%lld,\
+\"action\":\"serialized\",\
+\"address\":0x%lx,\
+\"returned\":%d\
+},\n\
+"
+    , (long long)HDtime(NULL), (unsigned long)entry->addr, (int)fxn_ret_value);
+
+    /* Write the log message to the file */
+    if(H5C__json_write_log_message(json_udata) < 0)
+        HGOTO_ERROR(H5E_CACHE, H5E_LOGGING, FAIL, "unable to emit log message")
+
+done:
+    FUNC_LEAVE_NOAPI(ret_value)
+} /* H5C__json_write_mark_serialized_entry_log_msg() */
+
+
+/*-------------------------------------------------------------------------
+ * Function:    H5C__json_write_move_entry_log_msg
+ *
+ * Purpose:     Write a log message for moving a cache entry.
+ *
+ * Return:      SUCCEED/FAIL
+ *
+ * Programmer:  Dana Robinson
+ *              Fall 2018
+ *
+ *-------------------------------------------------------------------------
+ */
+static herr_t
+H5C__json_write_move_entry_log_msg(void *udata, haddr_t old_addr, haddr_t new_addr,
+    int type_id, herr_t fxn_ret_value)
+{
+    H5C_log_json_udata_t *json_udata = (H5C_log_json_udata_t *)(udata);
+    herr_t ret_value = SUCCEED;
+
+    FUNC_ENTER_STATIC
+
+    /* Sanity checks */
+    HDassert(json_udata);
+    HDassert(json_udata->message);
+
+    /* Create the log message string */
+    HDsnprintf(json_udata->message, H5C_MAX_JSON_LOG_MSG_SIZE, 
+"\
+{\
+\"timestamp\":%lld,\
+\"action\":\"move\",\
+\"old_address\":0x%lx,\
+\"new_address\":0x%lx,\
+\"type_id\":%d,\
+\"returned\":%d\
+},\n\
+"
+    , (long long)HDtime(NULL), (unsigned long)old_addr, 
+      (unsigned long)new_addr, type_id, (int)fxn_ret_value);
+
+    /* Write the log message to the file */
+    if(H5C__json_write_log_message(json_udata) < 0)
+        HGOTO_ERROR(H5E_CACHE, H5E_LOGGING, FAIL, "unable to emit log message")
+
+done:
+    FUNC_LEAVE_NOAPI(ret_value)
+} /* H5C__json_write_move_entry_log_msg() */
+
+
+/*-------------------------------------------------------------------------
+ * Function:    H5C__json_write_pin_entry_log_msg
+ *
+ * Purpose:     Write a log message for pinning a cache entry.
+ *
+ * Return:      SUCCEED/FAIL
+ *
+ * Programmer:  Dana Robinson
+ *              Fall 2018
+ *
+ *-------------------------------------------------------------------------
+ */
+static herr_t
+H5C__json_write_pin_entry_log_msg(void *udata, const H5C_cache_entry_t *entry,
+    herr_t fxn_ret_value)
+{
+    H5C_log_json_udata_t *json_udata = (H5C_log_json_udata_t *)(udata);
+    herr_t ret_value = SUCCEED;
+
+    FUNC_ENTER_STATIC
+
+    /* Sanity checks */
+    HDassert(json_udata);
+    HDassert(json_udata->message);
+    HDassert(entry);
+
+    /* Create the log message string */
+    HDsnprintf(json_udata->message, H5C_MAX_JSON_LOG_MSG_SIZE, 
+"\
+{\
+\"timestamp\":%lld,\
+\"action\":\"pin\",\
+\"address\":0x%lx,\
+\"returned\":%d\
+},\n\
+"
+    , (long long)HDtime(NULL), (unsigned long)entry->addr, 
+      (int)fxn_ret_value);
+
+    /* Write the log message to the file */
+    if(H5C__json_write_log_message(json_udata) < 0)
+        HGOTO_ERROR(H5E_CACHE, H5E_LOGGING, FAIL, "unable to emit log message")
+
+done:
+    FUNC_LEAVE_NOAPI(ret_value)
+} /* H5C__json_write_pin_entry_log_msg() */
+
+
+/*-------------------------------------------------------------------------
+ * Function:    H5C__json_write_create_fd_log_msg
+ *
+ * Purpose:     Write a log message for creating a flush dependency between
+ *              two cache entries.
+ *
+ * Return:      SUCCEED/FAIL
+ *
+ * Programmer:  Dana Robinson
+ *              Fall 2018
+ *
+ *-------------------------------------------------------------------------
+ */
+static herr_t
+H5C__json_write_create_fd_log_msg(void *udata, const H5C_cache_entry_t *parent,
+    const H5C_cache_entry_t *child, herr_t fxn_ret_value)
+{
+    H5C_log_json_udata_t *json_udata = (H5C_log_json_udata_t *)(udata);
+    herr_t ret_value = SUCCEED;
+
+    FUNC_ENTER_STATIC
+
+    /* Sanity checks */
+    HDassert(json_udata);
+    HDassert(json_udata->message);
+    HDassert(parent);
+    HDassert(child);
+
+    /* Create the log message string */
+    HDsnprintf(json_udata->message, H5C_MAX_JSON_LOG_MSG_SIZE, 
+"\
+{\
+\"timestamp\":%lld,\
+\"action\":\"create_fd\",\
+\"parent_addr\":0x%lx,\
+\"child_addr\":0x%lx,\
+\"returned\":%d\
+},\n\
+"
+    , (long long)HDtime(NULL), (unsigned long)parent->addr, 
+      (unsigned long)child->addr, (int)fxn_ret_value);
+
+    /* Write the log message to the file */
+    if(H5C__json_write_log_message(json_udata) < 0)
+        HGOTO_ERROR(H5E_CACHE, H5E_LOGGING, FAIL, "unable to emit log message")
+
+done:
+    FUNC_LEAVE_NOAPI(ret_value)
+} /* H5C__json_write_create_fd_log_msg() */
+
+
+/*-------------------------------------------------------------------------
+ * Function:    H5C__json_write_protect_entry_log_msg
+ *
+ * Purpose:     Write a log message for protecting a cache entry.
+ *
+ * Return:      SUCCEED/FAIL
+ *
+ * Programmer:  Dana Robinson
+ *              Fall 2018
+ *
+ *-------------------------------------------------------------------------
+ */
+static herr_t
+H5C__json_write_protect_entry_log_msg(void *udata, const H5C_cache_entry_t *entry,
+    int type_id, unsigned flags, herr_t fxn_ret_value)
+{
+    H5C_log_json_udata_t *json_udata = (H5C_log_json_udata_t *)(udata);
+    char rw_s[16];
+    herr_t ret_value = SUCCEED;
+
+    FUNC_ENTER_STATIC
+
+    /* Sanity checks */
+    HDassert(json_udata);
+    HDassert(json_udata->message);
+    HDassert(entry);
+
+    if(H5C__READ_ONLY_FLAG == flags)
+        HDstrcpy(rw_s, "READ");
+    else 
+        HDstrcpy(rw_s, "WRITE");
+
+    /* Create the log message string */
+    HDsnprintf(json_udata->message, H5C_MAX_JSON_LOG_MSG_SIZE, 
+"\
+{\
+\"timestamp\":%lld,\
+\"action\":\"protect\",\
+\"address\":0x%lx,\
+\"type_id\":%d,\
+\"readwrite\":\"%s\",\
+\"size\":%d,\
+\"returned\":%d\
+},\n\
+"
+    , (long long)HDtime(NULL), (unsigned long)entry->addr, 
+      type_id, rw_s, (int)entry->size, (int)fxn_ret_value);
+
+    /* Write the log message to the file */
+    if(H5C__json_write_log_message(json_udata) < 0)
+        HGOTO_ERROR(H5E_CACHE, H5E_LOGGING, FAIL, "unable to emit log message")
+
+done:
+    FUNC_LEAVE_NOAPI(ret_value)
+} /* H5C__json_write_protect_entry_log_msg() */
+
+
+/*-------------------------------------------------------------------------
+ * Function:    H5C__json_write_resize_entry_log_msg
+ *
+ * Purpose:     Write a log message for resizing a cache entry.
+ *
+ * Return:      SUCCEED/FAIL
+ *
+ * Programmer:  Dana Robinson
+ *              Fall 2018
+ *
+ *-------------------------------------------------------------------------
+ */
+static herr_t
+H5C__json_write_resize_entry_log_msg(void *udata, const H5C_cache_entry_t *entry,
+    size_t new_size, herr_t fxn_ret_value)
+{
+    H5C_log_json_udata_t *json_udata = (H5C_log_json_udata_t *)(udata);
+    herr_t ret_value = SUCCEED;
+
+    FUNC_ENTER_STATIC
+
+    /* Sanity checks */
+    HDassert(json_udata);
+    HDassert(json_udata->message);
+    HDassert(entry);
+
+    /* Create the log message string */
+    HDsnprintf(json_udata->message, H5C_MAX_JSON_LOG_MSG_SIZE, 
+"\
+{\
+\"timestamp\":%lld,\
+\"action\":\"resize\",\
+\"address\":0x%lx,\
+\"new_size\":%d,\
+\"returned\":%d\
+},\n\
+"
+    , (long long)HDtime(NULL), (unsigned long)entry->addr, 
+      (int)new_size, (int)fxn_ret_value);
+
+    /* Write the log message to the file */
+    if(H5C__json_write_log_message(json_udata) < 0)
+        HGOTO_ERROR(H5E_CACHE, H5E_LOGGING, FAIL, "unable to emit log message")
+
+done:
+    FUNC_LEAVE_NOAPI(ret_value)
+} /* H5C__json_write_resize_entry_log_msg() */
+
+
+/*-------------------------------------------------------------------------
+ * Function:    H5C__json_write_unpin_entry_log_msg
+ *
+ * Purpose:     Write a log message for unpinning a cache entry.
+ *
+ * Return:      SUCCEED/FAIL
+ *
+ * Programmer:  Dana Robinson
+ *              Fall 2018
+ *
+ *-------------------------------------------------------------------------
+ */
+static herr_t
+H5C__json_write_unpin_entry_log_msg(void *udata, const H5C_cache_entry_t *entry,
+    herr_t fxn_ret_value)
+{
+    H5C_log_json_udata_t *json_udata = (H5C_log_json_udata_t *)(udata);
+    herr_t ret_value = SUCCEED;
+
+    FUNC_ENTER_STATIC
+
+    /* Sanity checks */
+    HDassert(json_udata);
+    HDassert(json_udata->message);
+    HDassert(entry);
+
+    /* Create the log message string */
+    HDsnprintf(json_udata->message, H5C_MAX_JSON_LOG_MSG_SIZE, 
+"\
+{\
+\"timestamp\":%lld,\
+\"action\":\"unpin\",\
+\"address\":0x%lx,\
+\"returned\":%d\
+},\n\
+"
+    , (long long)HDtime(NULL), (unsigned long)entry->addr, 
+      (int)fxn_ret_value);
+
+    /* Write the log message to the file */
+    if(H5C__json_write_log_message(json_udata) < 0)
+        HGOTO_ERROR(H5E_CACHE, H5E_LOGGING, FAIL, "unable to emit log message")
+
+done:
+    FUNC_LEAVE_NOAPI(ret_value)
+} /* H5C__json_write_unpin_entry_log_msg() */
+
+
+/*-------------------------------------------------------------------------
+ * Function:    H5C__json_write_destroy_fd_log_msg
+ *
+ * Purpose:     Write a log message for destroying a flush dependency
+ *              between two cache entries.
+ *
+ * Return:      SUCCEED/FAIL
+ *
+ * Programmer:  Dana Robinson
+ *              Fall 2018
+ *
+ *-------------------------------------------------------------------------
+ */
+static herr_t
+H5C__json_write_destroy_fd_log_msg(void *udata, const H5C_cache_entry_t *parent,
+    const H5C_cache_entry_t *child, herr_t fxn_ret_value)
+{
+    H5C_log_json_udata_t *json_udata = (H5C_log_json_udata_t *)(udata);
+    herr_t ret_value = SUCCEED;
+
+    FUNC_ENTER_STATIC
+
+    /* Sanity checks */
+    HDassert(json_udata);
+    HDassert(json_udata->message);
+    HDassert(parent);
+    HDassert(child);
+
+    /* Create the log message string */
+    HDsnprintf(json_udata->message, H5C_MAX_JSON_LOG_MSG_SIZE, 
+"\
+{\
+\"timestamp\":%lld,\
+\"action\":\"destroy_fd\",\
+\"parent_addr\":0x%lx,\
+\"child_addr\":0x%lx,\
+\"returned\":%d\
+},\n\
+"
+    , (long long)HDtime(NULL), (unsigned long)parent->addr, 
+      (unsigned long)child->addr, (int)fxn_ret_value);
+
+    /* Write the log message to the file */
+    if(H5C__json_write_log_message(json_udata) < 0)
+        HGOTO_ERROR(H5E_CACHE, H5E_LOGGING, FAIL, "unable to emit log message")
+
+done:
+    FUNC_LEAVE_NOAPI(ret_value)
+} /* H5C__json_write_destroy_fd_log_msg() */
+
+
+/*-------------------------------------------------------------------------
+ * Function:    H5C__json_write_unprotect_entry_log_msg
+ *
+ * Purpose:     Write a log message for unprotecting a cache entry.
+ *
+ * Return:      SUCCEED/FAIL
+ *
+ * Programmer:  Dana Robinson
+ *              Fall 2018
+ *
+ *-------------------------------------------------------------------------
+ */
+static herr_t
+H5C__json_write_unprotect_entry_log_msg(void *udata, const H5C_cache_entry_t *entry,
+    int type_id, unsigned flags, herr_t fxn_ret_value)
+{
+    H5C_log_json_udata_t *json_udata = (H5C_log_json_udata_t *)(udata);
+    herr_t ret_value = SUCCEED;
+
+    FUNC_ENTER_STATIC
+
+    /* Sanity checks */
+    HDassert(json_udata);
+    HDassert(json_udata->message);
+    HDassert(entry);
+
+    /* Create the log message string */
+    HDsnprintf(json_udata->message, H5C_MAX_JSON_LOG_MSG_SIZE, 
+"\
+{\
+\"timestamp\":%lld,\
+\"action\":\"unprotect\",\
+\"address\":0x%lx,\
+\"id\":%d,\
+\"flags\":%x,\
+\"returned\":%d\
+},\n\
+"
+    , (long long)HDtime(NULL), (unsigned long)entry->addr, 
+      type_id, flags, (int)fxn_ret_value);
+
+    /* Write the log message to the file */
+    if(H5C__json_write_log_message(json_udata) < 0)
+        HGOTO_ERROR(H5E_CACHE, H5E_LOGGING, FAIL, "unable to emit log message")
+
+done:
+    FUNC_LEAVE_NOAPI(ret_value)
+} /* H5C__json_write_unprotect_entry_log_msg() */
+
+
+/*-------------------------------------------------------------------------
+ * Function:    H5C__json_write_set_cache_config_log_msg
+ *
+ * Purpose:     Write a log message for setting the cache configuration.
+ *
+ * Return:      SUCCEED/FAIL
+ *
+ * Programmer:  Dana Robinson
+ *              Fall 2018
+ *
+ *-------------------------------------------------------------------------
+ */
+static herr_t
+H5C__json_write_set_cache_config_log_msg(void *udata, const H5AC_cache_config_t *config,
+    herr_t fxn_ret_value)
+{
+    H5C_log_json_udata_t *json_udata = (H5C_log_json_udata_t *)(udata);
+    herr_t ret_value = SUCCEED;
+
+    FUNC_ENTER_STATIC
+
+    /* Sanity checks */
+    HDassert(json_udata);
+    HDassert(json_udata->message);
+    HDassert(config);
+
+    /* Create the log message string */
+    HDsnprintf(json_udata->message, H5C_MAX_JSON_LOG_MSG_SIZE, 
+"\
+{\
+\"timestamp\":%lld,\
+\"action\":\"set_config\",\
+\"returned\":%d\
+},\n\
+"
+    , (long long)HDtime(NULL), (int)fxn_ret_value);
+
+
+    /* Write the log message to the file */
+    if(H5C__json_write_log_message(json_udata) < 0)
+        HGOTO_ERROR(H5E_CACHE, H5E_LOGGING, FAIL, "unable to emit log message")
+
+done:
+    FUNC_LEAVE_NOAPI(ret_value)
+} /* H5C__json_write_set_cache_config_log_msg() */
+
+
+/*-------------------------------------------------------------------------
+ * Function:    H5C__json_write_remove_entry_log_msg
+ *
+ * Purpose:     Write a log message for removing a cache entry.
+ *
+ * Return:      SUCCEED/FAIL
+ *
+ * Programmer:  Dana Robinson
+ *              Fall 2018
+ *
+ *-------------------------------------------------------------------------
+ */
+static herr_t
+H5C__json_write_remove_entry_log_msg(void *udata, const H5C_cache_entry_t *entry,
+    herr_t fxn_ret_value)
+{
+    H5C_log_json_udata_t *json_udata = (H5C_log_json_udata_t *)(udata);
+    herr_t ret_value = SUCCEED;
+
+    FUNC_ENTER_STATIC
+
+    /* Sanity checks */
+    HDassert(json_udata);
+    HDassert(json_udata->message);
+    HDassert(entry);
+
+    /* Create the log message string */
+    HDsnprintf(json_udata->message, H5C_MAX_JSON_LOG_MSG_SIZE, 
+"\
+{\
+\"timestamp\":%lld,\
+\"action\":\"remove\",\
+\"address\":0x%lx,\
+\"returned\":%d\
+},\n\
+"
+    , (long long)HDtime(NULL), (unsigned long)entry->addr, 
+      (int)fxn_ret_value);
+
+    /* Write the log message to the file */
+    if(H5C__json_write_log_message(json_udata) < 0)
+        HGOTO_ERROR(H5E_CACHE, H5E_LOGGING, FAIL, "unable to emit log message")
+
+done:
+    FUNC_LEAVE_NOAPI(ret_value)
+} /* H5C__json_write_remove_entry_log_msg() */
+