From 26436c7da5e546cf112e9f8ecc90d59cc2e1bedf Mon Sep 17 00:00:00 2001 From: Nathan Bossart Date: Tue, 26 Dec 2023 22:25:45 -0600 Subject: [PATCH v6 3/3] use dsm registry for pg_prewarm --- contrib/pg_prewarm/autoprewarm.c | 46 +++++++++++--------------------- 1 file changed, 15 insertions(+), 31 deletions(-) diff --git a/contrib/pg_prewarm/autoprewarm.c b/contrib/pg_prewarm/autoprewarm.c index 9085a409db..9ea6c2252a 100644 --- a/contrib/pg_prewarm/autoprewarm.c +++ b/contrib/pg_prewarm/autoprewarm.c @@ -32,12 +32,12 @@ #include "access/xact.h" #include "catalog/pg_class.h" #include "catalog/pg_type.h" -#include "miscadmin.h" #include "pgstat.h" #include "postmaster/bgworker.h" #include "postmaster/interrupt.h" #include "storage/buf_internals.h" #include "storage/dsm.h" +#include "storage/dsm_registry.h" #include "storage/fd.h" #include "storage/ipc.h" #include "storage/latch.h" @@ -95,8 +95,6 @@ static void apw_start_database_worker(void); static bool apw_init_shmem(void); static void apw_detach_shmem(int code, Datum arg); static int apw_compare_blockinfo(const void *p, const void *q); -static void autoprewarm_shmem_request(void); -static shmem_request_hook_type prev_shmem_request_hook = NULL; /* Pointer to shared-memory state. */ static AutoPrewarmSharedState *apw_state = NULL; @@ -140,26 +138,11 @@ _PG_init(void) MarkGUCPrefixReserved("pg_prewarm"); - prev_shmem_request_hook = shmem_request_hook; - shmem_request_hook = autoprewarm_shmem_request; - /* Register autoprewarm worker, if enabled. */ if (autoprewarm) apw_start_leader_worker(); } -/* - * Requests any additional shared memory required for autoprewarm. - */ -static void -autoprewarm_shmem_request(void) -{ - if (prev_shmem_request_hook) - prev_shmem_request_hook(); - - RequestAddinShmemSpace(MAXALIGN(sizeof(AutoPrewarmSharedState))); -} - /* * Main entry point for the leader autoprewarm process. Per-database workers * have a separate entry point. @@ -767,6 +750,16 @@ autoprewarm_dump_now(PG_FUNCTION_ARGS) PG_RETURN_INT64((int64) num_blocks); } +static void +apw_init_state(void *ptr) +{ + AutoPrewarmSharedState *state = (AutoPrewarmSharedState *) ptr; + + LWLockInitialize(&state->lock, LWLockNewTrancheId()); + state->bgworker_pid = InvalidPid; + state->pid_using_dumpfile = InvalidPid; +} + /* * Allocate and initialize autoprewarm related shared memory, if not already * done, and set up backend-local pointer to that state. Returns true if an @@ -777,19 +770,10 @@ apw_init_shmem(void) { bool found; - LWLockAcquire(AddinShmemInitLock, LW_EXCLUSIVE); - apw_state = ShmemInitStruct("autoprewarm", - sizeof(AutoPrewarmSharedState), - &found); - if (!found) - { - /* First time through ... */ - LWLockInitialize(&apw_state->lock, LWLockNewTrancheId()); - apw_state->bgworker_pid = InvalidPid; - apw_state->pid_using_dumpfile = InvalidPid; - } - LWLockRelease(AddinShmemInitLock); - + apw_state = GetNamedDSMSegment("autoprewarm", + sizeof(AutoPrewarmSharedState), + apw_init_state, + &found); LWLockRegisterTranche(apw_state->lock.tranche, "autoprewarm"); return found; -- 2.25.1