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Add huge_page_size setting for use on Linux.

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This allows the huge page size to be set explicitly.  The default is 0,
meaning it will use the system default, as before.

Author: Odin Ugedal <odin@ugedal.com>
Discussion: https://postgr.es/m/20200608154639.20254-1-odin%40ugedal.com
This commit is contained in:
Thomas Munro
2020-07-17 14:33:00 +12:00
parent d66b23b032
commit d2bddc2500
6 changed files with 141 additions and 38 deletions
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32
src/backend/utils/misc/guc.c
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@ -20,11 +20,14 @@
#include <float.h>
#include <math.h>
#include <limits.h>
#include <unistd.h>
#ifndef WIN32
#include <sys/mman.h>
#endif
#include <sys/stat.h>
#ifdef HAVE_SYSLOG
#include <syslog.h>
#endif
#include <unistd.h>
#include "access/commit_ts.h"
#include "access/gin.h"
@ -198,6 +201,7 @@ 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 bool check_huge_page_size(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);
@ -576,6 +580,7 @@ int ssl_renegotiation_limit;
* need to be duplicated in all the different implementations of pg_shmem.c.
*/
int huge_pages;
int huge_page_size;
/*
* These variables are all dummies that don't do anything, except in some
@ -3381,6 +3386,17 @@ static struct config_int ConfigureNamesInt[] =
NULL, assign_tcp_user_timeout, show_tcp_user_timeout
},
{
{"huge_page_size", PGC_POSTMASTER, RESOURCES_MEM,
gettext_noop("The size of huge page that should be requested."),
NULL,
GUC_UNIT_KB
},
&huge_page_size,
0, 0, INT_MAX,
check_huge_page_size, NULL, NULL
},
/* End-of-list marker */
{
{NULL, 0, 0, NULL, NULL}, NULL, 0, 0, 0, NULL, NULL, NULL
@ -11565,6 +11581,20 @@ check_maintenance_io_concurrency(int *newval, void **extra, GucSource source)
return true;
}
static bool
check_huge_page_size(int *newval, void **extra, GucSource source)
{
#if !(defined(MAP_HUGE_MASK) && defined(MAP_HUGE_SHIFT))
/* Recent enough Linux only, for now. See GetHugePageSize(). */
if (*newval != 0)
{
GUC_check_errdetail("huge_page_size must be 0 on this platform.");
return false;
}
#endif
return true;
}
static void
assign_pgstat_temp_directory(const char *newval, void *extra)
{