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| author |   Lars Ellenberg <lars.ellenberg@linbit.com> | 2016-06-14 00:26:38 +0200 |
|---|---|---|
| committer |   Jens Axboe <axboe@fb.com> | 2016-06-13 21:43:08 -0600 |
| commit | 27ea1d876e16c0ca5ae6335fc85cf4f278f5c98c (patch) | |
| tree | cf6bc0c2019b0b573ca90112003976063d480884 /drivers/block/drbd/drbd_int.h | |
| parent | drbd: finally report ms, not jiffies, in log message (diff) | |
| download | linux-dev-27ea1d876e16c0ca5ae6335fc85cf4f278f5c98c.tar.xz linux-dev-27ea1d876e16c0ca5ae6335fc85cf4f278f5c98c.zip | |
drbd: al_write_transaction: skip re-scanning of bitmap page pointer array
For larger devices, the array of bitmap page pointers can grow very
large (8000 pointers per TB of storage).
For each activity log transaction, we need to flush the associated
bitmap pages to stable storage. Currently, we just "mark" the respective
pages while setting up the transaction, then tell the bitmap code to
write out all marked pages, but skip unchanged pages.
But one such transaction can affect only a small number of bitmap pages,
there is no need to scan the full array of several (ten-)thousand
page pointers to find the few marked ones.
Instead, remember the index numbers of the few affected pages,
and later only re-check those to skip duplicates and unchanged ones.
Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'drivers/block/drbd/drbd_int.h')
| -rw-r--r-- | drivers/block/drbd/drbd_int.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/block/drbd/drbd_int.h b/drivers/block/drbd/drbd_int.h index 2c9194dc2ec2..352fbe031b98 100644 --- a/drivers/block/drbd/drbd_int.h +++ b/drivers/block/drbd/drbd_int.h @@ -1378,6 +1378,7 @@ extern int drbd_bm_e_weight(struct drbd_device *device, unsigned long enr); extern int drbd_bm_read(struct drbd_device *device) __must_hold(local); extern void drbd_bm_mark_for_writeout(struct drbd_device *device, int page_nr); extern int drbd_bm_write(struct drbd_device *device) __must_hold(local); +extern void drbd_bm_reset_al_hints(struct drbd_device *device) __must_hold(local); extern int drbd_bm_write_hinted(struct drbd_device *device) __must_hold(local); extern int drbd_bm_write_lazy(struct drbd_device *device, unsigned upper_idx) __must_hold(local); extern int drbd_bm_write_all(struct drbd_device *device) __must_hold(local); |