redonkable/alistair23-linux
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[XFS] Increase the size of the buffer holding the local inode cluster

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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: Nathan Scott <nathans@sgi.com>
Signed-off-by: Tim Shimmin <tes@sgi.com>
This commit is contained in:
Nathan Scott 2006-09-28 11:02:09 +10:00 committed by Tim Shimmin
parent 2627509330
commit bb3c7d2936
1 changed files with 16 additions and 6 deletions
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22
fs/xfs/xfs_itable.c
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@ -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) {
/*