diff options
Diffstat (limited to 'src/backend/access/transam/xlog.c')
| -rw-r--r-- | src/backend/access/transam/xlog.c | 43 |
1 files changed, 26 insertions, 17 deletions
diff --git a/src/backend/access/transam/xlog.c b/src/backend/access/transam/xlog.c index f731dd66b7a..84a0d0df5b6 100644 --- a/src/backend/access/transam/xlog.c +++ b/src/backend/access/transam/xlog.c @@ -7,7 +7,7 @@ * Portions Copyright (c) 1996-2005, PostgreSQL Global Development Group * Portions Copyright (c) 1994, Regents of the University of California * - * $PostgreSQL: pgsql/src/backend/access/transam/xlog.c,v 1.208 2005/07/08 04:07:26 tgl Exp $ + * $PostgreSQL: pgsql/src/backend/access/transam/xlog.c,v 1.209 2005/07/23 15:29:47 momjian Exp $ * *------------------------------------------------------------------------- */ @@ -48,46 +48,55 @@ /* + * Becauase O_DIRECT bypasses the kernel buffers, and because we never + * read those buffers except during crash recovery, it seems like + * a win to use it in all cases. + */ +#ifdef O_DIRECT +#define PG_O_DIRECT O_DIR(enableFsync ? (open_sync_bit | O_DIRECT) : 0) +#else + +/* * This chunk of hackery attempts to determine which file sync methods * are available on the current platform, and to choose an appropriate * default method. We assume that fsync() is always available, and that * configure determined whether fdatasync() is. */ #if defined(O_SYNC) -#define OPEN_SYNC_FLAG O_SYNC +#define OPEN_SYNC_FLAG O_SYNC #else #if defined(O_FSYNC) -#define OPEN_SYNC_FLAG O_FSYNC +#define OPEN_SYNC_FLAG O_FSYNC #endif #endif #if defined(O_DSYNC) #if defined(OPEN_SYNC_FLAG) #if O_DSYNC != OPEN_SYNC_FLAG -#define OPEN_DATASYNC_FLAG O_DSYNC +#define OPEN_DATASYNC_FLAG O_DSYNC #endif #else /* !defined(OPEN_SYNC_FLAG) */ /* Win32 only has O_DSYNC */ -#define OPEN_DATASYNC_FLAG O_DSYNC +#define OPEN_DATASYNC_FLAG O_DSYNC #endif #endif #if defined(OPEN_DATASYNC_FLAG) -#define DEFAULT_SYNC_METHOD_STR "open_datasync" -#define DEFAULT_SYNC_METHOD SYNC_METHOD_OPEN -#define DEFAULT_SYNC_FLAGBIT OPEN_DATASYNC_FLAG +#define DEFAULT_SYNC_METHOD_STR "open_datasync" +#define DEFAULT_SYNC_METHOD SYNC_METHOD_OPEN +#define DEFAULT_SYNC_FLAGBIT OPEN_DATASYNC_FLAG #elif defined(HAVE_FDATASYNC) -#define DEFAULT_SYNC_METHOD_STR "fdatasync" -#define DEFAULT_SYNC_METHOD SYNC_METHOD_FDATASYNC -#define DEFAULT_SYNC_FLAGBIT 0 +#define DEFAULT_SYNC_METHOD_STR "fdatasync" +#define DEFAULT_SYNC_METHOD SYNC_METHOD_FDATASYNC +#define DEFAULT_SYNC_FLAGBIT 0 #elif !defined(HAVE_FSYNC_WRITETHROUGH_ONLY) -#define DEFAULT_SYNC_METHOD_STR "fsync" -#define DEFAULT_SYNC_METHOD SYNC_METHOD_FSYNC -#define DEFAULT_SYNC_FLAGBIT 0 +#define DEFAULT_SYNC_METHOD_STR "fsync" +#define DEFAULT_SYNC_METHOD SYNC_METHOD_FSYNC +#define DEFAULT_SYNC_FLAGBIT 0 #else -#define DEFAULT_SYNC_METHOD_STR "fsync_writethrough" -#define DEFAULT_SYNC_METHOD SYNC_METHOD_FSYNC_WRITETHROUGH -#define DEFAULT_SYNC_FLAGBIT 0 +#define DEFAULT_SYNC_METHOD_STR "fsync_writethrough" +#define DEFAULT_SYNC_METHOD SYNC_METHOD_FSYNC_WRITETHROUGH +#define DEFAULT_SYNC_FLAGBIT 0 #endif |