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| author | Tejun Heo <tj@kernel.org> | 2011-01-13 22:59:59 +0300 |
|---|---|---|
| committer | Alasdair G Kergon <agk@redhat.com> | 2011-01-13 22:59:59 +0300 |
| commit | 239c8dd533e74de4a7f3c85c4f9f430eb08867c1 (patch) | |
| tree | 0dfb9e39aad0f2ab09a4f278a6e7f1b46bf64307 | |
| parent | 9c4376de98719d2768dd919553843de34bb094a6 (diff) | |
| download | linux-239c8dd533e74de4a7f3c85c4f9f430eb08867c1.tar.xz | |
dm snapshot: persistent make metadata_wq multithreaded
metadata_wq serves on-stack work items from chunk_io(). Even if
multiple chunk_io() are simultaneously in progress, each is
independent and queued only once, so multithreaded workqueue can be
safely used.
Switch metadata_wq to multithread and flush the work item instead of
the workqueue in chunk_io().
Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
| -rw-r--r-- | drivers/md/dm-snap-persistent.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/md/dm-snap-persistent.c b/drivers/md/dm-snap-persistent.c index d3021a69c857..95891dfcbca0 100644 --- a/drivers/md/dm-snap-persistent.c +++ b/drivers/md/dm-snap-persistent.c @@ -256,7 +256,7 @@ static int chunk_io(struct pstore *ps, void *area, chunk_t chunk, int rw, */ INIT_WORK_ONSTACK(&req.work, do_metadata); queue_work(ps->metadata_wq, &req.work); - flush_workqueue(ps->metadata_wq); + flush_work(&req.work); return req.result; } @@ -818,7 +818,7 @@ static int persistent_ctr(struct dm_exception_store *store, atomic_set(&ps->pending_count, 0); ps->callbacks = NULL; - ps->metadata_wq = alloc_ordered_workqueue("ksnaphd", WQ_MEM_RECLAIM); + ps->metadata_wq = alloc_workqueue("ksnaphd", WQ_MEM_RECLAIM, 0); if (!ps->metadata_wq) { kfree(ps); DMERR("couldn't start header metadata update thread"); |