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| author | Nathan Scott <nathans@sgi.com> | 2006-09-28 11:02:09 +1000 |
|---|---|---|
| committer | Tim Shimmin <tes@sgi.com> | 2006-09-28 11:02:09 +1000 |
| commit | bb3c7d2936b6db6f5ded9abf4d215abe97af8372 (patch) | |
| tree | 0958e0102e703cceb42c4d4947227ac29642456e /fs/xfs | |
| parent | 2627509330323efc88b5818065cba737e000de5c (diff) | |
| download | linux-bb3c7d2936b6db6f5ded9abf4d215abe97af8372.tar.bz2 | |
[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: Nathan Scott <nathans@sgi.com>
Signed-off-by: Tim Shimmin <tes@sgi.com>
Diffstat (limited to 'fs/xfs')
| -rw-r--r-- | fs/xfs/xfs_itable.c | 22 |
1 files changed, 16 insertions, 6 deletions
diff --git a/fs/xfs/xfs_itable.c b/fs/xfs/xfs_itable.c index e6dbe6ba6fbd..315c9bcd3be3 100644 --- a/fs/xfs/xfs_itable.c +++ b/fs/xfs/xfs_itable.c @@ -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) { /* |