diff options
Diffstat (limited to 'src/backend/utils/mmgr/mcxt.c')
| -rw-r--r-- | src/backend/utils/mmgr/mcxt.c | 35 |
1 files changed, 34 insertions, 1 deletions
diff --git a/src/backend/utils/mmgr/mcxt.c b/src/backend/utils/mmgr/mcxt.c index 709bd74d328..6b77736a3bc 100644 --- a/src/backend/utils/mmgr/mcxt.c +++ b/src/backend/utils/mmgr/mcxt.c @@ -14,7 +14,7 @@ * * * IDENTIFICATION - * $Header: /cvsroot/pgsql/src/backend/utils/mmgr/mcxt.c,v 1.31 2002/08/10 20:29:18 momjian Exp $ + * $Header: /cvsroot/pgsql/src/backend/utils/mmgr/mcxt.c,v 1.32 2002/08/12 00:36:12 tgl Exp $ * *------------------------------------------------------------------------- */ @@ -225,6 +225,39 @@ MemoryContextResetAndDeleteChildren(MemoryContext context) } /* + * GetMemoryChunkSpace + * Given a currently-allocated chunk, determine the total space + * it occupies (including all memory-allocation overhead). + * + * This is useful for measuring the total space occupied by a set of + * allocated chunks. + */ +Size +GetMemoryChunkSpace(void *pointer) +{ + StandardChunkHeader *header; + + /* + * Try to detect bogus pointers handed to us, poorly though we can. + * Presumably, a pointer that isn't MAXALIGNED isn't pointing at an + * allocated chunk. + */ + Assert(pointer != NULL); + Assert(pointer == (void *) MAXALIGN(pointer)); + + /* + * OK, it's probably safe to look at the chunk header. + */ + header = (StandardChunkHeader *) + ((char *) pointer - STANDARDCHUNKHEADERSIZE); + + AssertArg(MemoryContextIsValid(header->context)); + + return (*header->context->methods->get_chunk_space) (header->context, + pointer); +} + +/* * MemoryContextStats * Print statistics about the named context and all its descendants. * |