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-rw-r--r--src/backend/utils/misc/guc.c32
1 files changed, 32 insertions, 0 deletions
diff --git a/src/backend/utils/misc/guc.c b/src/backend/utils/misc/guc.c
index 326e773b25f..68082315acd 100644
--- a/src/backend/utils/misc/guc.c
+++ b/src/backend/utils/misc/guc.c
@@ -196,6 +196,7 @@ static bool check_autovacuum_max_workers(int *newval, void **extra, GucSource so
static bool check_max_wal_senders(int *newval, void **extra, GucSource source);
static bool check_autovacuum_work_mem(int *newval, void **extra, GucSource source);
static bool check_effective_io_concurrency(int *newval, void **extra, GucSource source);
+static bool check_maintenance_io_concurrency(int *newval, void **extra, GucSource source);
static void assign_pgstat_temp_directory(const char *newval, void *extra);
static bool check_application_name(char **newval, void **extra, GucSource source);
static void assign_application_name(const char *newval, void *extra);
@@ -2885,6 +2886,24 @@ static struct config_int ConfigureNamesInt[] =
},
{
+ {"maintenance_io_concurrency",
+ PGC_USERSET,
+ RESOURCES_ASYNCHRONOUS,
+ gettext_noop("A variant of effective_io_concurrency that is used for maintenance work."),
+ NULL,
+ GUC_EXPLAIN
+ },
+ &maintenance_io_concurrency,
+#ifdef USE_PREFETCH
+ 10,
+#else
+ 0,
+#endif
+ 0, MAX_IO_CONCURRENCY,
+ check_maintenance_io_concurrency, NULL, NULL
+ },
+
+ {
{"backend_flush_after", PGC_USERSET, RESOURCES_ASYNCHRONOUS,
gettext_noop("Number of pages after which previously performed writes are flushed to disk."),
NULL,
@@ -11466,6 +11485,19 @@ check_effective_io_concurrency(int *newval, void **extra, GucSource source)
return true;
}
+static bool
+check_maintenance_io_concurrency(int *newval, void **extra, GucSource source)
+{
+#ifndef USE_PREFETCH
+ if (*newval != 0)
+ {
+ GUC_check_errdetail("maintenance_io_concurrency must be set to 0 on platforms that lack posix_fadvise().");
+ return false;
+ }
+#endif /* USE_PREFETCH */
+ return true;
+}
+
static void
assign_pgstat_temp_directory(const char *newval, void *extra)
{