Revert function to get memory context stats for processes

Due to concerns raised about the approach, and memory leaks found
in sensitive contexts the functionality is reverted. This reverts
commits 45e7e8ca9, f8c115a6c, d2a1ed172, 55ef7abf8 and 042a66291
for v18 with an intent to revisit this patch for v19.

Discussion: https://postgr.es/m/594293.1747708165@sss.pgh.pa.us

1 files changed, 0 insertions, 82 deletions

diff --git a/src/include/utils/memutils.h b/src/include/utils/memutils.h
index c0987dca155..8abc26abce2 100644
--- a/src/include/utils/memutils.h
+++ b/src/include/utils/memutils.h
@@ -18,9 +18,6 @@
 #define MEMUTILS_H
 
 #include "nodes/memnodes.h"
-#include "storage/condition_variable.h"
-#include "storage/lmgr.h"
-#include "utils/dsa.h"
 
 
 /*
@@ -51,23 +48,6 @@
 
 #define AllocHugeSizeIsValid(size)	((Size) (size) <= MaxAllocHugeSize)
 
-/*
- * Memory Context reporting size limits.
- */
-
-/* Max length of context name and ident */
-#define MEMORY_CONTEXT_IDENT_SHMEM_SIZE 64
-/* Maximum size (in bytes) of DSA area per process */
-#define MEMORY_CONTEXT_REPORT_MAX_PER_BACKEND  ((size_t) (1 * 1024 * 1024))
-
-/*
- * Maximum size per context. Actual size may be lower as this assumes the worst
- * case of deepest path and longest identifiers (name and ident, thus the
- * multiplication by 2). The path depth is limited to 100 like for memory
- * context logging.
- */
-#define MAX_MEMORY_CONTEXT_STATS_SIZE (sizeof(MemoryStatsEntry) + \
-	(100 * sizeof(int)) + (2 * MEMORY_CONTEXT_IDENT_SHMEM_SIZE))
 
 /*
  * Standard top-level memory contexts.
@@ -339,66 +319,4 @@ pg_memory_is_all_zeros(const void *ptr, size_t len)
 	return true;
 }
 
-/* Dynamic shared memory state for statistics per context */
-typedef struct MemoryStatsEntry
-{
-	dsa_pointer name;
-	dsa_pointer ident;
-	dsa_pointer path;
-	NodeTag		type;
-	int			path_length;
-	int			levels;
-	int64		totalspace;
-	int64		nblocks;
-	int64		freespace;
-	int64		freechunks;
-	int			num_agg_stats;
-} MemoryStatsEntry;
-
-/*
- * Static shared memory state representing the DSA area created for memory
- * context statistics reporting.  A single DSA area is created and used by all
- * the processes, each having its specific DSA allocations for sharing memory
- * statistics, tracked by per backend static shared memory state.
- */
-typedef struct MemoryStatsCtl
-{
-	dsa_handle	memstats_dsa_handle;
-	LWLock		lw_lock;
-} MemoryStatsCtl;
-
-/*
- * Per backend static shared memory state for memory context statistics
- * reporting.
- */
-typedef struct MemoryStatsBackendState
-{
-	ConditionVariable memcxt_cv;
-	LWLock		lw_lock;
-	int			proc_id;
-	int			total_stats;
-	bool		summary;
-	dsa_pointer memstats_dsa_pointer;
-	TimestampTz stats_timestamp;
-} MemoryStatsBackendState;
-
-
-/*
- * Used for storage of transient identifiers for pg_get_backend_memory_contexts
- */
-typedef struct MemoryStatsContextId
-{
-	MemoryContext context;
-	int			context_id;
-} MemoryStatsContextId;
-
-extern PGDLLIMPORT MemoryStatsBackendState *memCxtState;
-extern PGDLLIMPORT MemoryStatsCtl *memCxtArea;
-extern PGDLLIMPORT dsa_area *MemoryStatsDsaArea;
-extern void ProcessGetMemoryContextInterrupt(void);
-extern const char *ContextTypeToString(NodeTag type);
-extern void HandleGetMemoryContextInterrupt(void);
-extern Size MemoryContextReportingShmemSize(void);
-extern void MemoryContextReportingShmemInit(void);
-extern void AtProcExit_memstats_cleanup(int code, Datum arg);
 #endif							/* MEMUTILS_H */