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[PATCH] ocfs2: Remove expensive bitmap scanning

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Enable expensive bitmap scanning only if DEBUG option is enabled.
The bitmap scanning quite loads the CPU and on my machine the write
throughput of dd if=/dev/zero of=/ocfs2/file bs=1M count=500 conv=sync
improves from 37 MB/s to 45.4 MB/s in local mode...

Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Mark Fasheh <mark.fasheh@oracle.com>
This commit is contained in:
Jan Kara 2007-11-13 19:59:33 +01:00 committed by Mark Fasheh
parent a46043e08f
commit 5a58c3ef22
2 changed files with 12 additions and 2 deletions
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9
fs/Kconfig
View File

@ -459,6 +459,15 @@ config OCFS2_DEBUG_MASKLOG
This option will enlarge your kernel, but it allows debugging of
ocfs2 filesystem issues.
config OCFS2_DEBUG_FS
bool "OCFS2 expensive checks"
depends on OCFS2_FS
default n
help
This option will enable expensive consistency checks. Enable
this option for debugging only as it is likely to decrease
performance of the filesystem.
config MINIX_FS
tristate "Minix fs support"
help

5
fs/ocfs2/localalloc.c
View File

@ -484,6 +484,7 @@ int ocfs2_reserve_local_alloc_bits(struct ocfs2_super *osb,
alloc = (struct ocfs2_dinode *) osb->local_alloc_bh->b_data;
#ifdef OCFS2_DEBUG_FS
if (le32_to_cpu(alloc->id1.bitmap1.i_used) !=
ocfs2_local_alloc_count_bits(alloc)) {
ocfs2_error(osb->sb, "local alloc inode %llu says it has "
@ -494,6 +495,7 @@ int ocfs2_reserve_local_alloc_bits(struct ocfs2_super *osb,
status = -EIO;
goto bail;
}
#endif
free_bits = le32_to_cpu(alloc->id1.bitmap1.i_total) -
le32_to_cpu(alloc->id1.bitmap1.i_used);
@ -712,9 +714,8 @@ static int ocfs2_sync_local_to_main(struct ocfs2_super *osb,
void *bitmap;
struct ocfs2_local_alloc *la = OCFS2_LOCAL_ALLOC(alloc);
mlog_entry("total = %u, COUNT = %u, used = %u\n",
mlog_entry("total = %u, used = %u\n",
le32_to_cpu(alloc->id1.bitmap1.i_total),
ocfs2_local_alloc_count_bits(alloc),
le32_to_cpu(alloc->id1.bitmap1.i_used));
if (!alloc->id1.bitmap1.i_total) {