diff options
Diffstat (limited to 'src/backend/access/transam/xlog.c')
| -rw-r--r-- | src/backend/access/transam/xlog.c | 12 |
1 files changed, 7 insertions, 5 deletions
diff --git a/src/backend/access/transam/xlog.c b/src/backend/access/transam/xlog.c index 57a8d1833d8..85618fcf01c 100644 --- a/src/backend/access/transam/xlog.c +++ b/src/backend/access/transam/xlog.c @@ -7,7 +7,7 @@ * Portions Copyright (c) 1996-2006, PostgreSQL Global Development Group * Portions Copyright (c) 1994, Regents of the University of California * - * $PostgreSQL: pgsql/src/backend/access/transam/xlog.c,v 1.239 2006/06/16 04:11:48 momjian Exp $ + * $PostgreSQL: pgsql/src/backend/access/transam/xlog.c,v 1.240 2006/06/18 18:30:20 tgl Exp $ * *------------------------------------------------------------------------- */ @@ -2147,11 +2147,13 @@ XLogFileClose(void) { Assert(openLogFile >= 0); -#ifdef POSIX_FADV_DONTNEED +#if defined(HAVE_DECL_POSIX_FADVISE) && defined(POSIX_FADV_DONTNEED) /* - * WAL caches will not be accessed in the future, so we advise OS to - * free them. But we will not do so if WAL archiving is active, - * because archivers might use the caches to read the WAL segment. + * 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(). */ |