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[XFS] choose single default logbuf count & size 

Remove sizing of logbuf size & count based on physical memory; this was
never a very good gauge as it's looking at global memory, but deciding on
sizing per-filesystem; no account is made of the total number of
filesystems, for example.

For now just take the largest "default" case, as was set for machines with
>400MB - 8 x 32k buffers. This can always be tuned higher or lower with
mount options if necessary. Removes one more user of xfs_physmem.

SGI-PV: 968563
SGI-Modid: xfs-linux-melb:xfs-kern:29323a

Signed-off-by: Eric Sandeen <sandeen@sandeen.net>
Signed-off-by: David Chinner <dgc@sgi.com>
Signed-off-by: Tim Shimmin <tes@sgi.com>
This commit is contained in:
Eric Sandeen 2007-08-16 16:24:43 +10:00 committed by Tim Shimmin
parent 40906630f1
commit 1cb5125875
2 changed files with 7 additions and 27 deletions
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33
fs/xfs/xfs_log.c
View File

@ -1025,10 +1025,7 @@ xlog_bdstrat_cb(struct xfs_buf *bp)
/*
* Return size of each in-core log record buffer.
*
* Low memory machines only get 2 16KB buffers. We don't want to waste
* memory here. However, all other machines get at least 2 32KB buffers.
* The number is hard coded because we don't care about the minimum
* memory size, just 32MB systems.
* All machines get 8 x 32KB buffers by default, unless tuned otherwise.
*
* If the filesystem blocksize is too large, we may need to choose a
* larger size since the directory code currently logs entire blocks.
@ -1041,17 +1038,10 @@ xlog_get_iclog_buffer_size(xfs_mount_t *mp,
int size;
int xhdrs;
if (mp->m_logbufs <= 0) {
if (xfs_physmem <= btoc(128*1024*1024)) {
log->l_iclog_bufs = XLOG_MIN_ICLOGS;
} else if (xfs_physmem <= btoc(400*1024*1024)) {
log->l_iclog_bufs = XLOG_MED_ICLOGS;
} else { /* 256K with 32K bufs */
log->l_iclog_bufs = XLOG_MAX_ICLOGS;
}
} else {
if (mp->m_logbufs <= 0)
log->l_iclog_bufs = XLOG_MAX_ICLOGS;
else
log->l_iclog_bufs = mp->m_logbufs;
}
/*
* Buffer size passed in from mount system call.
@ -1082,18 +1072,9 @@ xlog_get_iclog_buffer_size(xfs_mount_t *mp,
goto done;
}
/*
* Special case machines that have less than 32MB of memory.
* All machines with more memory use 32KB buffers.
*/
if (xfs_physmem <= btoc(32*1024*1024)) {
/* Don't change; min configuration */
log->l_iclog_size = XLOG_RECORD_BSIZE; /* 16k */
log->l_iclog_size_log = XLOG_RECORD_BSHIFT;
} else {
log->l_iclog_size = XLOG_BIG_RECORD_BSIZE; /* 32k */
log->l_iclog_size_log = XLOG_BIG_RECORD_BSHIFT;
}
/* All machines use 32KB buffers by default. */
log->l_iclog_size = XLOG_BIG_RECORD_BSIZE;
log->l_iclog_size_log = XLOG_BIG_RECORD_BSHIFT;
/* the default log size is 16k or 32k which is one header sector */
log->l_iclog_hsize = BBSIZE;

1
fs/xfs/xfs_log_priv.h
View File

@ -30,7 +30,6 @@ struct xfs_mount;
*/
#define XLOG_MIN_ICLOGS 2
#define XLOG_MED_ICLOGS 4
#define XLOG_MAX_ICLOGS 8
#define XLOG_HEADER_MAGIC_NUM 0xFEEDbabe /* Invalid cycle number */
#define XLOG_VERSION_1 1