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First phase of memory management rewrite (see backend/utils/mmgr/README
for details). It doesn't really do that much yet, since there are no short-term memory contexts in the executor, but the infrastructure is in place and long-term contexts are handled reasonably. A few long- standing bugs have been fixed, such as 'VACUUM; anything' in a single query string crashing. Also, out-of-memory is now considered a recoverable ERROR, not FATAL. Eliminate a large amount of crufty, now-dead code in and around memory management. Fix problem with holding off SIGTRAP, SIGSEGV, etc in postmaster and backend startup.
This commit is contained in:
Tom Lane
@@ -7,100 +7,88 @@
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* Portions Copyright (c) 1996-2000, PostgreSQL, Inc
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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* $Id: memnodes.h,v 1.16 2000/01/26 05:58:16 momjian Exp $
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* $Id: memnodes.h,v 1.17 2000/06/28 03:33:15 tgl Exp $
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*
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* XXX the typedefs in this file are different from the other ???nodes.h;
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* they are pointers to structures instead of the structures themselves.
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* If you're wondering, this is plain laziness. I don't want to touch
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* the memory context code which should be revamped altogether some day.
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* - ay 10/94
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*-------------------------------------------------------------------------
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*/
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#ifndef MEMNODES_H
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#define MEMNODES_H
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#include "lib/fstack.h"
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#include "nodes/nodes.h"
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#include "utils/memutils.h"
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/*
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* MemoryContext
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* A logical context in which memory allocations occur.
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*
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* The types of memory contexts can be thought of as members of the
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* following inheritance hierarchy with properties summarized below.
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* MemoryContext itself is an abstract type that can have multiple
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* implementations, though for now we have only AllocSetContext.
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* The function pointers in MemoryContextMethods define one specific
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* implementation of MemoryContext --- they are a virtual function table
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* in C++ terms.
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*
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* Node
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* |
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* MemoryContext___
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* / \
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* GlobalMemory PortalMemoryContext
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* / \
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* PortalVariableMemory PortalHeapMemory
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* Node types that are actual implementations of memory contexts must
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* begin with the same fields as MemoryContext.
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*
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* Flushed at Flushed at Checkpoints
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* Transaction Portal
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* Commit Close
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*
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* GlobalMemory n n n
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* PortalVariableMemory n y n
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* PortalHeapMemory y y y
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* Note: for largely historical reasons, typedef MemoryContext is a pointer
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* to the context struct rather than the struct type itself.
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*/
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typedef struct MemoryContextMethodsData
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typedef struct MemoryContextMethods
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{
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Pointer (*alloc) ();
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void (*free_p) (); /* need to use free as a #define, so can't
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* use free */
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Pointer (*realloc) ();
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char *(*getName) ();
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void (*dump) ();
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} *MemoryContextMethods;
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void *(*alloc) (MemoryContext context, Size size);
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/* call this free_p in case someone #define's free() */
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void (*free_p) (MemoryContext context, void *pointer);
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void *(*realloc) (MemoryContext context, void *pointer, Size size);
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void (*init) (MemoryContext context);
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void (*reset) (MemoryContext context);
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void (*delete) (MemoryContext context);
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void (*stats) (MemoryContext context);
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} MemoryContextMethods;
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typedef struct MemoryContextData
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{
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NodeTag type;
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MemoryContextMethods method;
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NodeTag type; /* identifies exact kind of context */
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MemoryContextMethods *methods; /* virtual function table */
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MemoryContext parent; /* NULL if no parent (toplevel context) */
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MemoryContext firstchild; /* head of linked list of children */
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MemoryContext nextchild; /* next child of same parent */
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char *name; /* context name (just for debugging) */
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} MemoryContextData;
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/* utils/mcxt.h contains typedef struct MemoryContextData *MemoryContext */
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/* utils/palloc.h contains typedef struct MemoryContextData *MemoryContext */
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/* think about doing this right some time but we'll have explicit fields
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for now -ay 10/94 */
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typedef struct GlobalMemoryData
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/*
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* AllocSetContext is our standard implementation of MemoryContext.
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*/
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typedef struct AllocBlockData *AllocBlock; /* internal to aset.c */
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typedef struct AllocChunkData *AllocChunk;
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typedef struct AllocSetContext
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{
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NodeTag type;
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MemoryContextMethods method;
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AllocSetData setData;
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char *name;
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OrderedElemData elemData;
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} GlobalMemoryData;
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MemoryContextData header; /* Standard memory-context fields */
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/* Info about storage allocated in this context: */
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AllocBlock blocks; /* head of list of blocks in this set */
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#define ALLOCSET_NUM_FREELISTS 8
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AllocChunk freelist[ALLOCSET_NUM_FREELISTS]; /* free chunk lists */
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/* Allocation parameters for this context: */
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Size initBlockSize; /* initial block size */
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Size maxBlockSize; /* maximum block size */
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AllocBlock keeper; /* if not NULL, keep this block
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* over resets */
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} AllocSetContext;
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/* utils/mcxt.h contains typedef struct GlobalMemoryData *GlobalMemory */
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typedef struct MemoryContextData *PortalMemoryContext;
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typedef struct PortalVariableMemoryData
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{
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NodeTag type;
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MemoryContextMethods method;
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AllocSetData setData;
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} *PortalVariableMemory;
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typedef struct PortalHeapMemoryData
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{
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NodeTag type;
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MemoryContextMethods method;
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Pointer block;
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FixedStackData stackData;
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} *PortalHeapMemory;
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/*
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* MemoryContextIsValid
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* True iff memory context is valid.
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*
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* Add new context types to the set accepted by this macro.
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*/
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#define MemoryContextIsValid(context) \
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(IsA(context,MemoryContext) || IsA(context,GlobalMemory) || \
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IsA(context,PortalVariableMemory) || IsA(context,PortalHeapMemory))
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((context) != NULL && \
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(IsA((context), AllocSetContext)))
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#endif /* MEMNODES_H */
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@@ -7,7 +7,7 @@
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* Portions Copyright (c) 1996-2000, PostgreSQL, Inc
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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* $Id: nodes.h,v 1.69 2000/06/18 22:44:31 tgl Exp $
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* $Id: nodes.h,v 1.70 2000/06/28 03:33:15 tgl Exp $
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*
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*-------------------------------------------------------------------------
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*/
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@@ -122,10 +122,7 @@ typedef enum NodeTag
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*---------------------
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*/
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T_MemoryContext = 400,
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T_GlobalMemory,
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T_PortalMemoryContext,
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T_PortalVariableMemory,
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T_PortalHeapMemory,
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T_AllocSetContext,
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/*---------------------
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* TAGS FOR VALUE NODES (pg_list.h)
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