From 5a024cbbc3261454c49d8a77afd121605abc3390 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?C=C3=A9dric=20Villemain?= Date: Thu, 26 May 2011 00:46:03 +0200 Subject: [PATCH 4/7] Add a Hook to handle OSCache stats The hook is in RelationGetRelationOSCacheInFork --- src/backend/storage/buffer/bufmgr.c | 9 +++++++++ src/include/storage/bufmgr.h | 7 +++++++ src/tools/pgindent/typedefs.list | 1 + 3 files changed, 17 insertions(+), 0 deletions(-) diff --git a/src/backend/storage/buffer/bufmgr.c b/src/backend/storage/buffer/bufmgr.c new file mode 100644 index 670dbdf..9bfa78c *** a/src/backend/storage/buffer/bufmgr.c --- b/src/backend/storage/buffer/bufmgr.c *************** static volatile BufferDesc *BufferAlloc( *** 106,111 **** --- 106,116 ---- static void FlushBuffer(volatile BufferDesc *buf, SMgrRelation reln); static void AtProcExit_Buffers(int code, Datum arg); + /* + * Hooks for plugin to get control in + * RelationGetRelationOSCacheInFork + */ + oscache_hook_type OSCache_hook = NULL; /* * PrefetchBuffer -- initiate asynchronous read of a block of a relation *************** RelationGetRelationOSCacheInFork(Relatio *** 1938,1943 **** --- 1943,1952 ---- { float4 percent = 0; + /* if a plugin is present, let it manage things */ + if (OSCache_hook) + percent = (*OSCache_hook) (relation, forkNum); + return percent; } diff --git a/src/include/storage/bufmgr.h b/src/include/storage/bufmgr.h new file mode 100644 index 7d22b5a..3098275 *** a/src/include/storage/bufmgr.h --- b/src/include/storage/bufmgr.h *************** extern void AtProcExit_LocalBuffers(void *** 217,220 **** --- 217,227 ---- extern BufferAccessStrategy GetAccessStrategy(BufferAccessStrategyType btype); extern void FreeAccessStrategy(BufferAccessStrategy strategy); + /* + * Hooks for plugin to get control in + * RelationGetRelationOSCacheInFork + */ + typedef float4 (*oscache_hook_type) (Relation relation, ForkNumber forkNum); + extern PGDLLIMPORT oscache_hook_type OSCache_hook; + #endif diff --git a/src/tools/pgindent/typedefs.list b/src/tools/pgindent/typedefs.list new file mode 100644 index f2982cd..a1bf8fe *** a/src/tools/pgindent/typedefs.list --- b/src/tools/pgindent/typedefs.list *************** OprCacheKey *** 963,968 **** --- 963,969 ---- OprInfo OprProofCacheEntry OprProofCacheKey + OSCache_hook_type OutputContext OverrideSearchPath OverrideStackEntry -- 1.7.5.3