From: Yu Kuai <yukuai3@xxxxxxxxxx>
The background is that currently bitmap is using a global spin_lock,
cauing lock contention and huge IO performance degration for all raid
levels.
However, it's impossible to implement a new lock free bitmap with
current situation that md-bitmap exposes the internal implementation
with lots of exported apis. Hence bitmap_operations is invented, to
describe bitmap core implementation, and a new bitmap can be introduced
with a new bitmap_operations, we only need to switch to the new one
during initialization.
And with this we can build bitmap as kernel module, but that's not
our concern for now.
Noted I just compile this patchset, not tested yet.
Yu Kuai (26):
md/md-bitmap: introduce struct bitmap_operations
md/md-bitmap: merge md_bitmap_create() into bitmap_operations
md/md-bitmap: merge md_bitmap_load() into bitmap_operations
md/md-bitmap: merge md_bitmap_destroy() into bitmap_operations
md/md-bitmap: merge md_bitmap_flush() into bitmap_operations
md/md-bitmap: don't expose md_bitmap_print_sb()
md/md-bitmap: merge md_bitmap_update_sb() into bitmap_operations
md/md-bitmap: merge md_bitmap_status() into bitmap_operations
md/md-bitmap: remove md_bitmap_setallbits()
md/md-bitmap: merge bitmap_write_all() into bitmap_operations
md/md-bitmap: merge md_bitmap_dirty_bits() into bitmap_operations
md/md-bitmap: merge md_bitmap_startwrite() into bitmap_operations
md/md-bitmap: merge md_bitmap_endwrite() into bitmap_operations
md/md-bitmap: merge md_bitmap_start_sync() into bitmap_operations
md/md-bitmap: merge md_bitmap_end_sync() into bitmap_operations
md/md-bitmap: merge md_bitmap_close_sync() into bitmap_operations
md/md-bitmap: mrege md_bitmap_cond_end_sync() into bitmap_operations
md/md-bitmap: merge bitmap_sync_with_cluster() into bitmap_operations
md/md-bitmap: merge md_bitmap_resize() into bitmap_operations
md/md-bitmap: merge get_bitmap_from_slot() into bitmap_operations
md/md-bitmap: merge md_bitmap_copy_from_slot() into bitmap_operations
md/md-bitmap: merge md_bitmap_free() into bitmap_operations
md/md-bitmap: merge md_bitmap_wait_behind_writes() into
bitmap_operations
md/md-bitmap: merge md_bitmap_daemon_work() into bitmap_operations
md/md-bitmap: merge md_bitmap_unplug() and md_bitmap_unplug_async()
md/md-bitmap: merge bitmap_unplug() into bitmap_operations
drivers/md/dm-raid.c | 2 +-
drivers/md/md-bitmap.c | 216 +++++++++++++++++---------------
drivers/md/md-bitmap.h | 259 ++++++++++++++++++++++++++++++++++-----
drivers/md/md-cluster.c | 21 ++--
drivers/md/md.c | 13 +-
drivers/md/md.h | 1 +
drivers/md/raid1-10.c | 7 +-
drivers/md/raid1.c | 22 ++--
drivers/md/raid10.c | 32 +++--
drivers/md/raid5-cache.c | 2 +-
drivers/md/raid5.c | 25 ++--
11 files changed, 401 insertions(+), 199 deletions(-)
--
2.39.2
