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Commit bb3c7d29 authored by Nathan Scott's avatar Nathan Scott Committed by Tim Shimmin
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[XFS] Increase the size of the buffer holding the local inode cluster 


list, to increase our potential readahead window and in turn improve
bulkstat performance.

SGI-PV: 944409
SGI-Modid: xfs-linux-melb:xfs-kern:26607a

Signed-off-by: default avatarNathan Scott <nathans@sgi.com>
Signed-off-by: default avatarTim Shimmin <tes@sgi.com>
parent 26275093

fs/xfs/xfs_itable.c

+16 −6
Original line number Diff line number Diff line
@@ -324,6 +324,8 @@ xfs_bulkstat( 
	xfs_agino_t		gino;	/* current btree rec's start inode */

	int			i;	/* loop index */

	int			icount;	/* count of inodes good in irbuf */

	int			irbsize; /* size of irec buffer in bytes */

	unsigned int		kmflags; /* flags for allocating irec buffer */

	xfs_ino_t		ino;	/* inode number (filesystem) */

	xfs_inobt_rec_incore_t	*irbp;	/* current irec buffer pointer */

	xfs_inobt_rec_incore_t	*irbuf;	/* start of irec buffer */
@@ -369,12 +371,20 @@ xfs_bulkstat( 
	nimask = ~(nicluster - 1);

	nbcluster = nicluster >> mp->m_sb.sb_inopblog;

	/*

	 * Allocate a page-sized buffer for inode btree records.

	 * We could try allocating something smaller, but for normal

	 * calls we'll always (potentially) need the whole page.

	 * Allocate a local buffer for inode cluster btree records.

	 * This caps our maximum readahead window (so don't be stingy)

	 * but we must handle the case where we can't get a contiguous

	 * multi-page buffer, so we drop back toward pagesize; the end

	 * case we ensure succeeds, via appropriate allocation flags.

	 */

	irbuf = kmem_alloc(NBPC, KM_SLEEP);

	nirbuf = NBPC / sizeof(*irbuf);

	irbsize = NBPP * 4;

	kmflags = KM_SLEEP | KM_MAYFAIL;

	while (!(irbuf = kmem_alloc(irbsize, kmflags))) {

		if ((irbsize >>= 1) <= NBPP)

			kmflags = KM_SLEEP;

	}

	nirbuf = irbsize / sizeof(*irbuf);



	/*

	 * Loop over the allocation groups, starting from the last

	 * inode returned; 0 means start of the allocation group.
@@ -672,7 +682,7 @@ xfs_bulkstat( 
	/*

	 * Done, we're either out of filesystem or space to put the data.

	 */

	kmem_free(irbuf, NBPC);

	kmem_free(irbuf, irbsize);

	*ubcountp = ubelem;

	if (agno >= mp->m_sb.sb_agcount) {

		/*