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authorJoe Thornber <ejt@redhat.com>2014-03-03 15:37:24 (GMT)
committerMike Snitzer <snitzer@redhat.com>2014-03-27 20:56:23 (GMT)
commit428e4698642794444cdb26c148a827f22c28d546 (patch)
treecf554886d6d1f9434a58a3e139c5b7d4ee8a6ab5 /drivers/md
parenteec40579d84873dfb7021eb24c50360f073237c5 (diff)
downloadlinux-428e4698642794444cdb26c148a827f22c28d546.tar.xz
dm bitset: only flush the current word if it has been dirtied
This change offers a big performance boost for dm-era. Signed-off-by: Joe Thornber <ejt@redhat.com> Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Diffstat (limited to 'drivers/md')
-rw-r--r--drivers/md/persistent-data/dm-bitset.c10
-rw-r--r--drivers/md/persistent-data/dm-bitset.h1
2 files changed, 10 insertions, 1 deletions
diff --git a/drivers/md/persistent-data/dm-bitset.c b/drivers/md/persistent-data/dm-bitset.c
index cd9a86d..36f7cc2 100644
--- a/drivers/md/persistent-data/dm-bitset.c
+++ b/drivers/md/persistent-data/dm-bitset.c
@@ -65,7 +65,7 @@ int dm_bitset_flush(struct dm_disk_bitset *info, dm_block_t root,
int r;
__le64 value;
- if (!info->current_index_set)
+ if (!info->current_index_set || !info->dirty)
return 0;
value = cpu_to_le64(info->current_bits);
@@ -77,6 +77,8 @@ int dm_bitset_flush(struct dm_disk_bitset *info, dm_block_t root,
return r;
info->current_index_set = false;
+ info->dirty = false;
+
return 0;
}
EXPORT_SYMBOL_GPL(dm_bitset_flush);
@@ -94,6 +96,8 @@ static int read_bits(struct dm_disk_bitset *info, dm_block_t root,
info->current_bits = le64_to_cpu(value);
info->current_index_set = true;
info->current_index = array_index;
+ info->dirty = false;
+
return 0;
}
@@ -126,6 +130,8 @@ int dm_bitset_set_bit(struct dm_disk_bitset *info, dm_block_t root,
return r;
set_bit(b, (unsigned long *) &info->current_bits);
+ info->dirty = true;
+
return 0;
}
EXPORT_SYMBOL_GPL(dm_bitset_set_bit);
@@ -141,6 +147,8 @@ int dm_bitset_clear_bit(struct dm_disk_bitset *info, dm_block_t root,
return r;
clear_bit(b, (unsigned long *) &info->current_bits);
+ info->dirty = true;
+
return 0;
}
EXPORT_SYMBOL_GPL(dm_bitset_clear_bit);
diff --git a/drivers/md/persistent-data/dm-bitset.h b/drivers/md/persistent-data/dm-bitset.h
index e1b9bea..c2287d6 100644
--- a/drivers/md/persistent-data/dm-bitset.h
+++ b/drivers/md/persistent-data/dm-bitset.h
@@ -71,6 +71,7 @@ struct dm_disk_bitset {
uint64_t current_bits;
bool current_index_set:1;
+ bool dirty:1;
};
/*