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dm bitset: only flush the current word if it has been dirtied

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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>
This commit is contained in:
Joe Thornber 2014-03-03 10:37:24 -05:00 committed by Mike Snitzer
parent eec40579d8
commit 428e469864
2 changed files with 10 additions and 1 deletions
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10
drivers/md/persistent-data/dm-bitset.c
View file

@ -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);

1
drivers/md/persistent-data/dm-bitset.h
View file

@ -71,6 +71,7 @@ struct dm_disk_bitset {
uint64_t current_bits;
bool current_index_set:1;
bool dirty:1;
};
/*