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plprofiler.c
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plprofiler.c
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/*-------------------------------------------------------------------------
*
* plprofiler.c
*
* Profiling plugin for PL/pgSQL instrumentation
*
* Copyright (c) 2014-2022, OSCG-Partners
* Copyright (c) 2008-2014, PostgreSQL Global Development Group
* Copyright 2006,2007 - EnterpriseDB, Inc.
*
* Major Change History:
* 2012 - Removed from PostgreSQL plDebugger Extension
* 2015 - Resurrected as standalone plProfiler by OpenSCG
* 2016 - Rewritten as v2 to use shared hash tables, have lower overhead
* - v3 Major performance improvements, flame graph UI
*
*-------------------------------------------------------------------------
*/
#include "postgres.h"
#include "plprofiler.h"
/**********************************************************************
* PL executor callback function prototypes
**********************************************************************/
static void profiler_func_init(PLpgSQL_execstate *estate,
PLpgSQL_function * func);
static void profiler_func_beg(PLpgSQL_execstate *estate,
PLpgSQL_function *func);
static void profiler_func_end(PLpgSQL_execstate *estate,
PLpgSQL_function *func);
static void profiler_stmt_beg(PLpgSQL_execstate *estate, PLpgSQL_stmt *stmt);
static void profiler_stmt_end(PLpgSQL_execstate *estate, PLpgSQL_stmt *stmt);
/**********************************************************************
* Local function prototypes
**********************************************************************/
static Size profiler_shmem_size(void);
static void profiler_shmem_startup(void);
#if PG_VERSION_NUM >= 150000
static void profiler_shmem_request(void);
#endif
static void init_hash_tables(void);
static char *find_source(Oid oid, HeapTuple *tup, char **funcName);
static int count_source_lines(const char *src);
static uint32 line_hash_fn(const void *key, Size keysize);
static int line_match_fn(const void *key1, const void *key2, Size keysize);
static uint32 callgraph_hash_fn(const void *key, Size keysize);
static int callgraph_match_fn(const void *key1, const void *key2, Size keysize);
static void callgraph_push(Oid func_oid);
static void callgraph_pop_one(void);
static void callgraph_pop(Oid func_oid);
static void callgraph_check(Oid func_oid);
static void callgraph_collect(uint64 us_elapsed, uint64 us_self,
uint64 us_children);
static int32 profiler_collect_data(void);
static void profiler_xact_callback(XactEvent event, void *arg);
/**********************************************************************
* Local variables
**********************************************************************/
static MemoryContext profiler_mcxt = NULL;
static HTAB *functions_hash = NULL;
static HTAB *callgraph_hash = NULL;
static profilerSharedState *profiler_shared_state = NULL;
static HTAB *functions_shared = NULL;
static HTAB *callgraph_shared = NULL;
static bool profiler_first_call_in_xact = true;
static bool profiler_active = false;
static bool profiler_enabled_local = false;
static int profiler_max_functions = PL_MIN_FUNCTIONS;
static int profiler_max_lines = PL_MIN_LINES;
static int profiler_max_callgraph = PL_MIN_CALLGRAPH;
static callGraphKey graph_stack;
static instr_time graph_stack_entry[PL_MAX_STACK_DEPTH];
static uint64 graph_stack_child_time[PL_MAX_STACK_DEPTH];
static int graph_stack_pt = 0;
static time_t last_collect_time = 0;
static bool have_new_local_data = false;
static PLpgSQL_plugin *prev_plpgsql_plugin = NULL;
static PLpgSQL_plugin *prev_pltsql_plugin = NULL;
static shmem_startup_hook_type prev_shmem_startup_hook = NULL;
#if PG_VERSION_NUM >= 150000
static shmem_request_hook_type prev_shmem_request_hook = NULL;
#endif
static PLpgSQL_plugin plugin_funcs = {
profiler_func_init,
profiler_func_beg,
profiler_func_end,
profiler_stmt_beg,
profiler_stmt_end,
NULL,
NULL
};
/**********************************************************************
* Extension (de)initialization functions.
**********************************************************************/
void
_PG_init(void)
{
PLpgSQL_plugin **plugin_ptr;
/* Link us into the PL/pgSQL executor. */
plugin_ptr = (PLpgSQL_plugin **)find_rendezvous_variable("PLpgSQL_plugin");
prev_plpgsql_plugin = *plugin_ptr;
*plugin_ptr = &plugin_funcs;
/* Link us into the PL/TSQL executor. */
plugin_ptr = (PLpgSQL_plugin **)find_rendezvous_variable("PLTSQL_plugin");
prev_pltsql_plugin = *plugin_ptr;
*plugin_ptr = &plugin_funcs;
/* Initialize local hash tables. */
init_hash_tables();
if (process_shared_preload_libraries_in_progress)
{
/*
* When loaded via shared_preload_libraries, we have to
* also hook into the shmem_startup call chain and register
* a callback at transaction end.
*/
prev_shmem_startup_hook = shmem_startup_hook;
shmem_startup_hook = profiler_shmem_startup;
#if PG_VERSION_NUM >= 150000
prev_shmem_request_hook = shmem_request_hook;
shmem_request_hook = profiler_shmem_request;
#endif
RegisterXactCallback(profiler_xact_callback, NULL);
/*
* Additional config options only available if running via
* shared_preload_libraries. These all affect the amount of
* shared memory used by the extension, so they only make
* sense as PGC_POSTMASTER.
*/
DefineCustomIntVariable("plprofiler.max_functions",
"Maximum number of functions that can be "
"tracked in shared memory when using "
"plprofiler.collect_in_shmem",
NULL,
&profiler_max_functions,
PL_MIN_FUNCTIONS,
PL_MIN_FUNCTIONS,
INT_MAX,
PGC_POSTMASTER,
0,
NULL,
NULL,
NULL);
DefineCustomIntVariable("plprofiler.max_lines",
"Maximum number of source lines that can be "
"tracked in shared memory when using "
"plprofiler.collect_in_shmem",
NULL,
&profiler_max_lines,
PL_MIN_LINES,
PL_MIN_LINES,
INT_MAX,
PGC_POSTMASTER,
0,
NULL,
NULL,
NULL);
DefineCustomIntVariable("plprofiler.max_callgraphs",
"Maximum number of call graphs that can be "
"tracked in shared memory when using "
"plprofiler.collect_in_shmem",
NULL,
&profiler_max_callgraph,
PL_MIN_CALLGRAPH,
PL_MIN_CALLGRAPH,
INT_MAX,
PGC_POSTMASTER,
0,
NULL,
NULL,
NULL);
/* Request the additionl shared memory and LWLock needed. */
#if PG_VERSION_NUM < 150000
RequestAddinShmemSpace(profiler_shmem_size());
#if PG_VERSION_NUM >= 90600
RequestNamedLWLockTranche("plprofiler", 1);
#else
RequestAddinLWLocks(1);
#endif
#endif
}
}
void
_PG_fini(void)
{
PLpgSQL_plugin **plugin_ptr;
plugin_ptr = (PLpgSQL_plugin **)find_rendezvous_variable("PLpgSQL_plugin");
*plugin_ptr = prev_plpgsql_plugin;
prev_plpgsql_plugin = NULL;
plugin_ptr = (PLpgSQL_plugin **)find_rendezvous_variable("PLTSQL_plugin");
*plugin_ptr = prev_pltsql_plugin;
prev_pltsql_plugin = NULL;
MemoryContextDelete(profiler_mcxt);
profiler_mcxt = NULL;
functions_hash = NULL;
callgraph_hash = NULL;
if (prev_shmem_startup_hook != NULL)
{
shmem_startup_hook = prev_shmem_startup_hook;
prev_shmem_startup_hook = NULL;
UnregisterXactCallback(profiler_xact_callback, NULL);
}
}
/* -------------------------------------------------------------------
* profiler_shmem_size()
*
* Calculate the amount of shared memory the profiler needs to
* keep functions, callgraphs and line statistics globally.
* -------------------------------------------------------------------
*/
static Size
profiler_shmem_size(void)
{
Size num_bytes;
num_bytes = offsetof(profilerSharedState, line_info);
num_bytes = add_size(num_bytes,
sizeof(linestatsLineInfo) * profiler_max_lines);
num_bytes = add_size(num_bytes,
hash_estimate_size(profiler_max_functions,
sizeof(linestatsEntry)));
num_bytes = add_size(num_bytes,
hash_estimate_size(profiler_max_callgraph,
sizeof(callGraphEntry)));
return num_bytes;
}
/**********************************************************************
* Hook functions
**********************************************************************/
/* -------------------------------------------------------------------
* profiler_func_init()
*
* This hook function is called by the PL/pgSQL interpreter when a
* new function is about to start. Specifically, this instrumentation
* hook is called after the stack frame has been created, but before
* values are assigned to the local variables.
*
* 'estate' points to the stack frame for this function, 'func'
* points to the definition of the function
*
* We use this hook to load the source code for the function that's
* being invoked and to set up our context structures
* -------------------------------------------------------------------
*/
static void
profiler_func_init(PLpgSQL_execstate *estate, PLpgSQL_function *func )
{
profilerInfo *profiler_info;
linestatsHashKey linestats_key;
linestatsEntry *linestats_entry;
bool linestats_found;
/*
* On first call within a transaction we determine if the profiler
* is active or not. This means that starting/stopping to collect
* data will only happen on a transaction boundary.
*/
if (profiler_first_call_in_xact)
{
profiler_first_call_in_xact = false;
if (profiler_shared_state != NULL)
{
profiler_active = (
profiler_shared_state->profiler_enabled_global ||
profiler_shared_state->profiler_enabled_pid == MyProcPid ||
profiler_enabled_local);
}
else
{
profiler_active = profiler_enabled_local;
}
}
if (!profiler_active)
{
/*
* The profiler can be enabled/disabled via changing postgresql.conf
* and reload (SIGHUP). The change becomes visible in backends the
* next time, the TCOP loop is ready for a new client query. This
* allows to enable the profiler for some time, have it save the
* stats in the permanent tables, then turn it off again. At that
* moment, we want to release all profiler resources.
*/
if (functions_hash != NULL)
init_hash_tables();
return;
}
/*
* Anonymous code blocks do not have function source code
* that we can lookup in pg_proc. For now we ignore them.
*/
if (func->fn_oid == InvalidOid)
return;
/* Tell collect_data() that new information has arrived locally. */
have_new_local_data = true;
/*
* Search for this function in our line stats hash table. Create the
* entry if it does not exist yet.
*/
linestats_key.db_oid = MyDatabaseId;
linestats_key.fn_oid = func->fn_oid;
linestats_entry = (linestatsEntry *)hash_search(functions_hash,
&linestats_key,
HASH_ENTER,
&linestats_found);
if (linestats_entry == NULL)
elog(ERROR, "plprofiler out of memory");
if (!linestats_found)
{
/* New function, initialize entry. */
MemoryContext old_context;
HeapTuple proc_tuple;
char *proc_src;
char *func_name;
proc_src = find_source( func->fn_oid, &proc_tuple, &func_name );
linestats_entry->line_count = count_source_lines(proc_src) + 1;
old_context = MemoryContextSwitchTo(profiler_mcxt);
linestats_entry->line_info = palloc0(linestats_entry->line_count *
sizeof(linestatsLineInfo));
MemoryContextSwitchTo(old_context);
ReleaseSysCache(proc_tuple);
}
/*
* The PL/pgSQL interpreter provides a void pointer (in each stack frame)
* that's reserved for plugins. We allocate a profilerInfo structure and
* record it's address in that pointer so we can keep some per-invocation
* information.
*/
profiler_info = (profilerInfo *)palloc(sizeof(profilerInfo ));
profiler_info->fn_oid = func->fn_oid;
profiler_info->line_count = linestats_entry->line_count;
profiler_info->line_info = palloc0(profiler_info->line_count *
sizeof(profilerLineInfo));
estate->plugin_info = profiler_info;
}
/* -------------------------------------------------------------------
* profiler_func_beg()
*
* This hook function is called by the PL/pgSQL interpreter when a
* new function is starting. Specifically, this instrumentation
* hook is called after values have been assigned to all local
* variables (and all function parameters).
*
* 'estate' points to the stack frame for this function, 'func'
* points to the definition of the function
* -------------------------------------------------------------------
*/
static void
profiler_func_beg(PLpgSQL_execstate *estate, PLpgSQL_function *func)
{
if (!profiler_active)
return;
/* Ignore anonymous code block. */
if (estate->plugin_info == NULL)
return;
/*
* Push this function Oid onto the stack, remember the entry time and
* set the time spent in children to zero.
*/
callgraph_push(func->fn_oid);
}
/* -------------------------------------------------------------------
* profiler_func_end()
*
* This hook function is called by the PL/pgSQL interpreter when a
* function runs to completion.
* -------------------------------------------------------------------
*/
static void
profiler_func_end(PLpgSQL_execstate *estate, PLpgSQL_function *func)
{
profilerInfo *profiler_info;
linestatsHashKey key;
linestatsEntry *entry;
int i;
if (!profiler_active)
return;
/* Ignore anonymous code block. */
if (estate->plugin_info == NULL)
return;
/* Tell collect_data() that new information has arrived locally. */
have_new_local_data = true;
/* Find the linestats hash table entry for this function. */
profiler_info = (profilerInfo *) estate->plugin_info;
key.db_oid = MyDatabaseId;
key.fn_oid = func->fn_oid;
entry = (linestatsEntry *)hash_search(functions_hash, &key,
HASH_FIND, NULL);
if (!entry)
{
elog(DEBUG1, "plprofiler: local linestats entry for fn_oid %u "
"not found", func->fn_oid);
return;
}
/* Loop through each line of source code and update the stats */
for(i = 1; i < profiler_info->line_count; i++)
{
entry->line_info[i].exec_count +=
profiler_info->line_info[i].exec_count;
entry->line_info[i].us_total +=
profiler_info->line_info[i].us_total;
if (profiler_info->line_info[i].us_max > entry->line_info[i].us_max)
entry->line_info[i].us_max =
profiler_info->line_info[i].us_max;
}
/*
* Pop the call stack. This also does the time accounting
* for call graphs.
*/
callgraph_pop(func->fn_oid);
/*
* Finally if a plprofiler.collect_interval is configured, save and reset
* the stats if the interval has elapsed.
*/
if (profiler_shared_state != NULL &&
(profiler_shared_state->profiler_enabled_global ||
MyProcPid == profiler_shared_state->profiler_enabled_pid) &&
profiler_shared_state->profiler_collect_interval > 0)
{
time_t now = time(NULL);
if (now >= last_collect_time +
profiler_shared_state->profiler_collect_interval)
{
profiler_collect_data();
last_collect_time = now;
}
}
}
/* -------------------------------------------------------------------
* profiler_stmt_beg()
*
* This hook function is called by the PL/pgSQL interpreter just before
* executing a statement (stmt).
*
* Prior to executing each statement, we record the current time and
* the current values of all of the performance counters.
* -------------------------------------------------------------------
*/
static void
profiler_stmt_beg(PLpgSQL_execstate *estate, PLpgSQL_stmt *stmt)
{
profilerLineInfo *line_info;
profilerInfo *profiler_info;
if (!profiler_active)
return;
/* Ignore anonymous code block. */
if (estate->plugin_info == NULL)
return;
/* Set the start time of the statement */
profiler_info = (profilerInfo *)estate->plugin_info;
if (stmt->lineno < profiler_info->line_count)
{
line_info = profiler_info->line_info + stmt->lineno;
INSTR_TIME_SET_CURRENT(line_info->start_time);
}
/* Check the call graph stack. */
callgraph_check(profiler_info->fn_oid);
}
/* -------------------------------------------------------------------
* profiler_stmt_end()
*
* This hook function is called by the PL/pgSQL interpreter just after
* it executes a statement (stmt).
*
* We use this hook to 'delta' the before and after performance counters
* and record the differences in the profilerStmtInfo structure associated
* with this statement.
* -------------------------------------------------------------------
*/
static void
profiler_stmt_end(PLpgSQL_execstate *estate, PLpgSQL_stmt *stmt)
{
profilerLineInfo *line_info;
profilerInfo *profiler_info;
instr_time end_time;
uint64 elapsed;
if (!profiler_active)
return;
/* Ignore anonymous code block. */
if (estate->plugin_info == NULL)
return;
profiler_info = (profilerInfo *)estate->plugin_info;
/*
* Ignore out of bounds line numbers. Someone is apparently
* profiling while executing DDL ... not much use in that.
*/
if (stmt->lineno >= profiler_info->line_count)
return;
/* Tell collect_data() that new information has arrived locally. */
have_new_local_data = true;
line_info = profiler_info->line_info + stmt->lineno;
INSTR_TIME_SET_CURRENT(end_time);
INSTR_TIME_SUBTRACT(end_time, line_info->start_time);
elapsed = INSTR_TIME_GET_MICROSEC(end_time);
if (elapsed > line_info->us_max)
line_info->us_max = elapsed;
line_info->us_total += elapsed;
line_info->exec_count++;
}
/**********************************************************************
* Helper functions
**********************************************************************/
/* -------------------------------------------------------------------
* init_hash_tables()
*
* Initialize hash table
* -------------------------------------------------------------------
*/
static void
init_hash_tables(void)
{
HASHCTL hash_ctl;
/* Create the memory context for our data */
if (profiler_mcxt != NULL)
{
if (profiler_mcxt->isReset)
return;
MemoryContextReset(profiler_mcxt);
}
else
{
profiler_mcxt = AllocSetContextCreate(TopMemoryContext,
"PL/pgSQL profiler",
ALLOCSET_DEFAULT_MINSIZE,
ALLOCSET_DEFAULT_INITSIZE,
ALLOCSET_DEFAULT_MAXSIZE);
}
/* Create the hash table for line stats */
MemSet(&hash_ctl, 0, sizeof(hash_ctl));
hash_ctl.keysize = sizeof(linestatsHashKey);
hash_ctl.entrysize = sizeof(linestatsEntry);
hash_ctl.hash = line_hash_fn;
hash_ctl.match = line_match_fn;
hash_ctl.hcxt = profiler_mcxt;
functions_hash = hash_create("Function Lines",
10000,
&hash_ctl,
HASH_ELEM | HASH_FUNCTION | HASH_COMPARE);
/* Create the hash table for call stats */
MemSet(&hash_ctl, 0, sizeof(hash_ctl));
hash_ctl.keysize = sizeof(callGraphKey);
hash_ctl.entrysize = sizeof(callGraphEntry);
hash_ctl.hash = callgraph_hash_fn;
hash_ctl.match = callgraph_match_fn;
hash_ctl.hcxt = profiler_mcxt;
callgraph_hash = hash_create("Function Call Graphs",
1000,
&hash_ctl,
HASH_ELEM | HASH_FUNCTION | HASH_COMPARE);
}
#if PG_VERSION_NUM >= 150000
static void
profiler_shmem_request(void)
{
if (prev_shmem_request_hook)
prev_shmem_request_hook();
RequestAddinShmemSpace(profiler_shmem_size());
RequestNamedLWLockTranche("plprofiler", 1);
}
#endif
static void
profiler_shmem_startup(void)
{
bool found;
profilerSharedState *plpss;
Size plpss_size = 0;
HASHCTL hash_ctl;
if (prev_shmem_startup_hook)
prev_shmem_startup_hook();
/* Reset in case of restart inside of the postmaster. */
profiler_shared_state = NULL;
functions_shared = NULL;
callgraph_shared = NULL;
LWLockAcquire(AddinShmemInitLock, LW_EXCLUSIVE);
/* Create or attach to the shared state */
plpss_size = add_size(plpss_size,
offsetof(profilerSharedState, line_info));
plpss_size = add_size(plpss_size,
sizeof(linestatsLineInfo) * profiler_max_lines);
profiler_shared_state = ShmemInitStruct("plprofiler state", plpss_size,
&found);
plpss = profiler_shared_state;
if (!found)
{
memset(plpss, 0, offsetof(profilerSharedState, line_info) +
sizeof(linestatsLineInfo) * profiler_max_lines);
#if PG_VERSION_NUM >= 90600
plpss->lock = &(GetNamedLWLockTranche("plprofiler"))->lock;
#else
plpss->lock = LWLockAssign();
#endif
}
/* (Re)Initialize local hash tables. */
init_hash_tables();
/* Create or attache to the shared functions hash table */
memset(&hash_ctl, 0, sizeof(hash_ctl));
hash_ctl.keysize = sizeof(linestatsHashKey);
hash_ctl.entrysize = sizeof(linestatsEntry);
hash_ctl.hash = line_hash_fn;
hash_ctl.match = line_match_fn;
functions_shared = ShmemInitHash("plprofiler functions",
profiler_max_functions,
profiler_max_functions,
&hash_ctl,
HASH_ELEM | HASH_FUNCTION | HASH_COMPARE);
/* Create or attache to the shared callgraph hash table */
memset(&hash_ctl, 0, sizeof(hash_ctl));
hash_ctl.keysize = sizeof(callGraphKey);
hash_ctl.entrysize = sizeof(callGraphEntry);
hash_ctl.hash = callgraph_hash_fn;
hash_ctl.match = callgraph_match_fn;
callgraph_shared = ShmemInitHash("plprofiler callgraph",
profiler_max_callgraph,
profiler_max_callgraph,
&hash_ctl,
HASH_ELEM | HASH_FUNCTION | HASH_COMPARE);
LWLockRelease(AddinShmemInitLock);
}
/* -------------------------------------------------------------------
* find_source()
*
* This function locates and returns a pointer to a null-terminated string
* that contains the source code for the given function.
*
* In addition to returning a pointer to the requested source code, this
* function sets *tup to point to a HeapTuple (that you must release when
* you are finished with it) and sets *funcName to point to the name of
* the given function.
* -------------------------------------------------------------------
*/
static char *
find_source(Oid oid, HeapTuple *tup, char **funcName)
{
bool isNull;
*tup = SearchSysCache(PROCOID, ObjectIdGetDatum(oid), 0, 0, 0);
if(!HeapTupleIsValid(*tup))
elog(ERROR, "plprofiler: cache lookup for function %u failed", oid);
if (funcName != NULL)
*funcName = NameStr(((Form_pg_proc)GETSTRUCT(*tup))->proname);
return DatumGetCString(DirectFunctionCall1(textout,
SysCacheGetAttr(PROCOID,
*tup,
Anum_pg_proc_prosrc,
&isNull)));
}
/* -------------------------------------------------------------------
* count_source_lines()
*
* This function scans through the source code for a given function
* and counts the number of lines of code present in the string.
* -------------------------------------------------------------------
*/
static int
count_source_lines(const char *src)
{
int line_count = 1;
const char *cp = src;
while(cp != NULL)
{
line_count++;
cp = strchr(cp, '\n');
if (cp)
cp++;
}
return line_count;
}
static uint32
line_hash_fn(const void *key, Size keysize)
{
const linestatsHashKey *k = (const linestatsHashKey *) key;
return hash_uint32((uint32) k->fn_oid) ^
hash_uint32((uint32) k->db_oid);
}
static int
line_match_fn(const void *key1, const void *key2, Size keysize)
{
const linestatsHashKey *k1 = (const linestatsHashKey *)key1;
const linestatsHashKey *k2 = (const linestatsHashKey *)key2;
if (k1->fn_oid == k2->fn_oid &&
k1->db_oid == k2->db_oid)
return 0;
else
return 1;
}
static uint32
callgraph_hash_fn(const void *key, Size keysize)
{
return hash_any(key, keysize);
}
static int
callgraph_match_fn(const void *key1, const void *key2, Size keysize)
{
callGraphKey *stack1 = (callGraphKey *)key1;
callGraphKey *stack2 = (callGraphKey *)key2;
int i;
if (stack1->db_oid != stack2->db_oid)
return 1;
for (i = 0; i < PL_MAX_STACK_DEPTH && stack1->stack[i] != InvalidOid; i++)
if (stack1->stack[i] != stack2->stack[i])
return 1;
return 0;
}
static void
callgraph_push(Oid func_oid)
{
/*
* We only track function Oids in the call stack up to PL_MAX_STACK_DEPTH.
* Beyond that we just count the current stack depth.
*/
if (graph_stack_pt < PL_MAX_STACK_DEPTH)
{
/*
* Push this function Oid onto the stack, remember the entry time and
* set the time spent in children to zero.
*/
graph_stack.stack[graph_stack_pt] = func_oid;
INSTR_TIME_SET_CURRENT(graph_stack_entry[graph_stack_pt]);
graph_stack_child_time[graph_stack_pt] = 0;
}
graph_stack_pt++;
}
static void
callgraph_pop_one(void)
{
instr_time now;
uint64 us_elapsed;
uint64 us_self;
linestatsHashKey key;
linestatsEntry *entry;
/* Check for call stack underrun. */
if (graph_stack_pt <= 0)
{
elog(DEBUG1, "plprofiler: call graph stack underrun");
return;
}
/* Remove one level from the call stack. */
graph_stack_pt--;
/* Calculate the time spent in this function and record it. */
INSTR_TIME_SET_CURRENT(now);
INSTR_TIME_SUBTRACT(now, graph_stack_entry[graph_stack_pt]);
us_elapsed = INSTR_TIME_GET_MICROSEC(now);
us_self = us_elapsed - graph_stack_child_time[graph_stack_pt];
callgraph_collect(us_elapsed, us_self,
graph_stack_child_time[graph_stack_pt]);
/* If we have a caller, add our own time to the time of its children. */
if (graph_stack_pt > 0)
graph_stack_child_time[graph_stack_pt - 1] += us_elapsed;
/*
* We also collect per function global counts in the pseudo line number
* zero. The line stats are cumulative (for example a FOR ... LOOP
* statement has the entire execution time of all statements in its
* block), so this can't be derived from the actual per line data.
*/
key.fn_oid = graph_stack.stack[graph_stack_pt];
key.db_oid = MyDatabaseId;
entry = (linestatsEntry *)hash_search(functions_hash, &key, HASH_FIND, NULL);
if (entry)
{
entry->line_info[0].exec_count += 1;
entry->line_info[0].us_total += us_elapsed;
if (us_elapsed > entry->line_info[0].us_max)
entry->line_info[0].us_max = us_elapsed;
}
else
{
elog(DEBUG1, "plprofiler: local linestats entry for fn_oid %u "
"not found", graph_stack.stack[graph_stack_pt]);
}
/* Zap the oid from the call stack. */
graph_stack.stack[graph_stack_pt] = InvalidOid;
}
static void
callgraph_pop(Oid func_oid)
{
callgraph_check(func_oid);
callgraph_pop_one();
}
static void
callgraph_check(Oid func_oid)
{
/*
* Unwind the call stack until our own func_oid appears on the top.
*
* In case of an exception, the pl executor does not call the
* func_end callback, so we record now as the end of the function
* calls, that were left on the stack.
*/
while (graph_stack_pt > 0
&& graph_stack.stack[graph_stack_pt - 1] != func_oid)
{
elog(DEBUG1, "plprofiler: unwinding excess call graph stack entry for %u in %u",
graph_stack.stack[graph_stack_pt - 1], func_oid);
callgraph_pop_one();
}
}
static void
callgraph_collect(uint64 us_elapsed, uint64 us_self, uint64 us_children)
{
callGraphEntry *entry;
bool found;
graph_stack.db_oid = MyDatabaseId;
entry = (callGraphEntry *)hash_search(callgraph_hash, &graph_stack,
HASH_ENTER, &found);
if (!found)
{
entry->callCount = 1;
entry->totalTime = us_elapsed;
entry->childTime = us_children;
entry->selfTime = us_self;
}
else
{
entry->callCount++;
entry->totalTime = entry->totalTime + us_elapsed;
entry->childTime = entry->childTime + us_children;
entry->selfTime = entry->selfTime + us_self;
}
}
static int32
profiler_collect_data(void)
{
HASH_SEQ_STATUS hash_seq;
callGraphEntry *cge1;
callGraphEntry *cge2;
linestatsEntry *lse1;
linestatsEntry *lse2;
profilerSharedState *plpss = profiler_shared_state;
bool have_exclusive_lock = false;
bool found;
int i;
/*
* Return without doing anything if the plprofiler extension
* was not loaded via shared_preload_libraries. We don't have
* any shared memory state in that case.
*/
if (plpss == NULL)
return -1;
/*
* Don't waste any time here if there was no new data recorded
* since the last collect_data() call.
*/
if (!have_new_local_data)
return 0;
have_new_local_data = false;
/*
* Acquire a shared lock on the shared hash tables. We escalate
* to an exclusive lock later in case we need to add a new entry.
*/
LWLockAcquire(plpss->lock, LW_SHARED);
/* Collect the callgraph data into shared memory. */
hash_seq_init(&hash_seq, callgraph_hash);
while ((cge1 = hash_seq_search(&hash_seq)) != NULL)
{
cge2 = hash_search(callgraph_shared, &(cge1->key),
HASH_FIND, NULL);
if (cge2 == NULL)
{
/*
* This callgraph is not yet known in shared memory.
* Need to escalate the lock to exclusive.
*/
if (!have_exclusive_lock)
{
LWLockRelease(plpss->lock);
LWLockAcquire(plpss->lock, LW_EXCLUSIVE);
have_exclusive_lock = true;
}
cge2 = hash_search(callgraph_shared, &(cge1->key),
HASH_ENTER, &found);
if (cge2 == NULL)
{
/*