mcxtfuncs.c File Reference

#include "postgres.h"
#include "funcapi.h"
#include "mb/pg_wchar.h"
#include "storage/proc.h"
#include "storage/procarray.h"
#include "utils/builtins.h"

Include dependency graph for mcxtfuncs.c:

Go to the source code of this file.

Macros
#define	MEMORY_CONTEXT_IDENT_DISPLAY_SIZE   1024
#define	PG_GET_BACKEND_MEMORY_CONTEXTS_COLS   9

Functions
static void	PutMemoryContextsStatsTupleStore (Tuplestorestate *tupstore, TupleDesc tupdesc, MemoryContext context, const char *parent, int level)
Datum	pg_get_backend_memory_contexts (PG_FUNCTION_ARGS)
Datum	pg_log_backend_memory_contexts (PG_FUNCTION_ARGS)

Macro Definition Documentation

MEMORY_CONTEXT_IDENT_DISPLAY_SIZE

#define MEMORY_CONTEXT_IDENT_DISPLAY_SIZE   1024

Definition at line 28 of file mcxtfuncs.c.

PG_GET_BACKEND_MEMORY_CONTEXTS_COLS

#define PG_GET_BACKEND_MEMORY_CONTEXTS_COLS   9

Function Documentation

pg_get_backend_memory_contexts()

Datum pg_get_backend_memory_contexts

(

PG_FUNCTION_ARGS

)

Definition at line 119 of file mcxtfuncs.c.

{
    ReturnSetInfo *rsinfo = (ReturnSetInfo *) fcinfo->resultinfo;
 
    InitMaterializedSRF(fcinfo, 0);
    PutMemoryContextsStatsTupleStore(rsinfo->setResult, rsinfo->setDesc,
                                     TopMemoryContext, NULL, 0);
 
    return (Datum) 0;
}

References InitMaterializedSRF(), PutMemoryContextsStatsTupleStore(), ReturnSetInfo::setDesc, ReturnSetInfo::setResult, and TopMemoryContext.

pg_log_backend_memory_contexts()

Datum pg_log_backend_memory_contexts

(

PG_FUNCTION_ARGS

)

Definition at line 144 of file mcxtfuncs.c.

{
    int         pid = PG_GETARG_INT32(0);
    PGPROC     *proc;
    ProcNumber  procNumber = INVALID_PROC_NUMBER;
 
    /*
     * See if the process with given pid is a backend or an auxiliary process.
     */
    proc = BackendPidGetProc(pid);
    if (proc == NULL)
        proc = AuxiliaryPidGetProc(pid);
 
    /*
     * BackendPidGetProc() and AuxiliaryPidGetProc() return NULL if the pid
     * isn't valid; but by the time we reach kill(), a process for which we
     * get a valid proc here might have terminated on its own.  There's no way
     * to acquire a lock on an arbitrary process to prevent that. But since
     * this mechanism is usually used to debug a backend or an auxiliary
     * process running and consuming lots of memory, that it might end on its
     * own first and its memory contexts are not logged is not a problem.
     */
    if (proc == NULL)
    {
        /*
         * This is just a warning so a loop-through-resultset will not abort
         * if one backend terminated on its own during the run.
         */
        ereport(WARNING,
                (errmsg("PID %d is not a PostgreSQL server process", pid)));
        PG_RETURN_BOOL(false);
    }
 
    procNumber = GetNumberFromPGProc(proc);
    if (SendProcSignal(pid, PROCSIG_LOG_MEMORY_CONTEXT, procNumber) < 0)
    {
        /* Again, just a warning to allow loops */
        ereport(WARNING,
                (errmsg("could not send signal to process %d: %m", pid)));
        PG_RETURN_BOOL(false);
    }
 
    PG_RETURN_BOOL(true);
}

References AuxiliaryPidGetProc(), BackendPidGetProc(), ereport, errmsg(), GetNumberFromPGProc, INVALID_PROC_NUMBER, PG_GETARG_INT32, PG_RETURN_BOOL, PROCSIG_LOG_MEMORY_CONTEXT, SendProcSignal(), and WARNING.

PutMemoryContextsStatsTupleStore()

static void PutMemoryContextsStatsTupleStore ( Tuplestorestate *  tupstore, TupleDesc  tupdesc, MemoryContext  context, const char *  parent, int  level  )

static

Definition at line 35 of file mcxtfuncs.c.

{
#define PG_GET_BACKEND_MEMORY_CONTEXTS_COLS 9
 
    Datum       values[PG_GET_BACKEND_MEMORY_CONTEXTS_COLS];
    bool        nulls[PG_GET_BACKEND_MEMORY_CONTEXTS_COLS];
    MemoryContextCounters stat;
    MemoryContext child;
    const char *name;
    const char *ident;
 
    Assert(MemoryContextIsValid(context));
 
    name = context->name;
    ident = context->ident;
 
    /*
     * To be consistent with logging output, we label dynahash contexts with
     * just the hash table name as with MemoryContextStatsPrint().
     */
    if (ident && strcmp(name, "dynahash") == 0)
    {
        name = ident;
        ident = NULL;
    }
 
    /* Examine the context itself */
    memset(&stat, 0, sizeof(stat));
    (*context->methods->stats) (context, NULL, (void *) &level, &stat, true);
 
    memset(values, 0, sizeof(values));
    memset(nulls, 0, sizeof(nulls));
 
    if (name)
        values[0] = CStringGetTextDatum(name);
    else
        nulls[0] = true;
 
    if (ident)
    {
        int         idlen = strlen(ident);
        char        clipped_ident[MEMORY_CONTEXT_IDENT_DISPLAY_SIZE];
 
        /*
         * Some identifiers such as SQL query string can be very long,
         * truncate oversize identifiers.
         */
        if (idlen >= MEMORY_CONTEXT_IDENT_DISPLAY_SIZE)
            idlen = pg_mbcliplen(ident, idlen, MEMORY_CONTEXT_IDENT_DISPLAY_SIZE - 1);
 
        memcpy(clipped_ident, ident, idlen);
        clipped_ident[idlen] = '\0';
        values[1] = CStringGetTextDatum(clipped_ident);
    }
    else
        nulls[1] = true;
 
    if (parent)
        values[2] = CStringGetTextDatum(parent);
    else
        nulls[2] = true;
 
    values[3] = Int32GetDatum(level);
    values[4] = Int64GetDatum(stat.totalspace);
    values[5] = Int64GetDatum(stat.nblocks);
    values[6] = Int64GetDatum(stat.freespace);
    values[7] = Int64GetDatum(stat.freechunks);
    values[8] = Int64GetDatum(stat.totalspace - stat.freespace);
    tuplestore_putvalues(tupstore, tupdesc, values, nulls);
 
    for (child = context->firstchild; child != NULL; child = child->nextchild)
    {
        PutMemoryContextsStatsTupleStore(tupstore, tupdesc,
                                         child, name, level + 1);
    }
}

References Assert, context, CStringGetTextDatum, ident, Int32GetDatum(), Int64GetDatum(), MEMORY_CONTEXT_IDENT_DISPLAY_SIZE, MemoryContextIsValid, name, MemoryContextData::nextchild, PG_GET_BACKEND_MEMORY_CONTEXTS_COLS, pg_mbcliplen(), stat, tuplestore_putvalues(), and values.

Referenced by pg_get_backend_memory_contexts().