index 820b92c642f27901bf659bf7f1e5fb24f907a974..5d85213a8778bfcd5158dd519b56f906d07b9907 100755 (executable)
-for ac_func in cbrt dlopen fcvt fdatasync getpeereid getpeerucred getrlimit memmove poll pstat readlink setproctitle setsid sigprocmask symlink sysconf towlower utime utimes waitpid wcstombs
+
+for ac_func in cbrt dlopen fcvt fdatasync getpeereid getpeerucred getrlimit memmove poll posix_fadvise pstat readlink setproctitle setsid sigprocmask symlink sysconf towlower utime utimes waitpid wcstombs
do
as_ac_var=`echo "ac_cv_func_$ac_func" | $as_tr_sh`
{ echo "$as_me:$LINENO: checking for $ac_func" >&5
index 52a8db226cb11cd7049b0c978b9b50d0bbd16633..38c26f219403f5c061ca556112d5b7e5ca368708 100644 (file)
dnl Process this file with autoconf to produce a configure script.
-dnl $PostgreSQL: pgsql/configure.in,v 1.584 2009年01月07日 10:38:44 petere Exp $
+dnl $PostgreSQL: pgsql/configure.in,v 1.585 2009年01月11日 18:02:17 tgl Exp $
dnl
dnl Developers, please strive to achieve this order:
dnl
AC_FUNC_ACCEPT_ARGTYPES
PGAC_FUNC_GETTIMEOFDAY_1ARG
-AC_CHECK_FUNCS([cbrt dlopen fcvt fdatasync getpeereid getpeerucred getrlimit memmove poll pstat readlink setproctitle setsid sigprocmask symlink sysconf towlower utime utimes waitpid wcstombs])
+AC_CHECK_FUNCS([cbrt dlopen fcvt fdatasync getpeereid getpeerucred getrlimit memmove poll posix_fadvise pstat readlink setproctitle setsid sigprocmask symlink sysconf towlower utime utimes waitpid wcstombs])
AC_CHECK_DECLS(fdatasync, [], [], [#include <unistd.h>])
AC_CHECK_DECLS(posix_fadvise, [], [], [#include <fcntl.h>])
index daea9fafdfbad239e83292f554ba6d6b503c2d9d..9a2b3308b1eed996d33fd9c8fdf7aeffbfa24907 100644 (file)
* Portions Copyright (c) 1996-2009, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
- * $PostgreSQL: pgsql/src/backend/access/transam/xlog.c,v 1.326 2009年01月01日 17:23:36 momjian Exp $
+ * $PostgreSQL: pgsql/src/backend/access/transam/xlog.c,v 1.327 2009年01月11日 18:02:17 tgl Exp $
*
*-------------------------------------------------------------------------
*/
#include <ctype.h>
#include <signal.h>
#include <time.h>
+#include <fcntl.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <sys/wait.h>
{
Assert(openLogFile >= 0);
- /*
- * posix_fadvise is problematic on many platforms: on older x86 Linux it
- * just dumps core, and there are reports of problems on PPC platforms as
- * well. The following is therefore disabled for the time being. We could
- * consider some kind of configure test to see if it's safe to use, but
- * since we lack hard evidence that there's any useful performance gain to
- * be had, spending time on that seems unprofitable for now.
- */
-#ifdef NOT_USED
-
/*
* WAL segment files will not be re-read in normal operation, so we advise
- * OS to release any cached pages. But do not do so if WAL archiving is
- * active, because archiver process could use the cache to read the WAL
- * segment.
- *
- * While O_DIRECT works for O_SYNC, posix_fadvise() works for fsync() and
- * O_SYNC, and some platforms only have posix_fadvise().
- */
-#if defined(HAVE_DECL_POSIX_FADVISE) && defined(POSIX_FADV_DONTNEED)
- if (!XLogArchivingActive())
- posix_fadvise(openLogFile, 0, 0, POSIX_FADV_DONTNEED);
+ * the OS to release any cached pages. But do not do so if WAL archiving
+ * is active, because archiver process could use the cache to read the WAL
+ * segment. Also, don't bother with it if we are using O_DIRECT, since
+ * the kernel is presumably not caching in that case.
+ */
+#if defined(USE_POSIX_FADVISE) && defined(POSIX_FADV_DONTNEED)
+ if (!XLogArchivingActive() &&
+ (get_sync_bit(sync_method) & PG_O_DIRECT) == 0)
+ (void) posix_fadvise(openLogFile, 0, 0, POSIX_FADV_DONTNEED);
#endif
-#endif /* NOT_USED */
if (close(openLogFile))
ereport(PANIC,
index 308f2bb6a31aa69d60ef3287dd671f0dcc88fc8a..3cc7c7ce6a88d0ab8fd4804330e87a2b416b8fa2 100644 (file)
/* Define to 1 if you have the <poll.h> header file. */
#undef HAVE_POLL_H
+/* Define to 1 if you have the `posix_fadvise' function. */
+#undef HAVE_POSIX_FADVISE
+
/* Define to 1 if you have the POSIX signal interface. */
#undef HAVE_POSIX_SIGNALS
index 3c1c1c0b8e60ee00a36e2f0962f6a7374b01d916..ff9d6ce45decd23ebeeb96e7b940ac9a36355988 100644 (file)
* for developers. If you edit any of these, be sure to do a *full*
* rebuild (and an initdb if noted).
*
- * $PostgreSQL: pgsql/src/include/pg_config_manual.h,v 1.35 2008年07月12日 02:28:43 tgl Exp $
+ * $PostgreSQL: pgsql/src/include/pg_config_manual.h,v 1.36 2009年01月11日 18:02:17 tgl Exp $
*------------------------------------------------------------------------
*/
#define ALIGNOF_BUFFER 32
/*
- * Disable UNIX sockets for those operating system.
+ * Disable UNIX sockets for certain operating systems.
*/
#if defined(WIN32)
#undef HAVE_UNIX_SOCKETS
#define HAVE_WORKING_LINK 1
#endif
+/*
+ * USE_POSIX_FADVISE controls whether Postgres will attempt to use the
+ * posix_fadvise() kernel call. Usually the automatic configure tests are
+ * sufficient, but some older Linux distributions had broken versions of
+ * posix_fadvise(). If necessary you can remove the #define here.
+ */
+#if HAVE_DECL_POSIX_FADVISE && defined(HAVE_POSIX_FADVISE)
+#define USE_POSIX_FADVISE
+#endif
+
/*
* This is the default directory in which AF_UNIX socket files are
* placed. Caution: changing this risks breaking your existing client