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| author | Lars Ellenberg <lars.ellenberg@linbit.com> | 2015-05-18 14:08:46 +0200 |
|---|---|---|
| committer | Jens Axboe <axboe@fb.com> | 2015-11-25 17:22:03 +0100 |
| commit | f85d9f2d02cdcd1b79e00fccd667b37b251ba3ac (patch) | |
| tree | 44a62bbab00dc8eecfbdd9ab312eb4686994704c /drivers/block/drbd/drbd_int.h | |
| parent | drbd: fix memory leak in drbd_adm_resize (diff) | |
| download | linux-f85d9f2d02cdcd1b79e00fccd667b37b251ba3ac.tar.xz linux-f85d9f2d02cdcd1b79e00fccd667b37b251ba3ac.zip | |
drbd: fix "endless" transfer log walk in protocol A
Don't remember a DRBD request as ack_pending, if it is not.
In protocol A, we usually clear RQ_NET_PENDING at the same time we set
RQ_NET_SENT, so when deciding to remember it as ack_pending,
mod_rq_state needs to look at the current request state,
not at the previous state before the current modification was applied.
This should prevent advance_conn_req_ack_pending() from walking the full
transfer log just to find NULL in protocol A, which would cause serious
performance degradation with many "in-flight" requests, e.g. when
working via DRBD-proxy, or with a huge bandwidth-delay product.
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')
0 files changed, 0 insertions, 0 deletions