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authorAnand Avati <avati@redhat.com>2013-07-19 08:31:41 -0700
committerVijay Bellur <vbellur@redhat.com>2013-07-23 06:11:12 -0700
commit37ac6bdca826046cbcb0d50727af29baf9407950 (patch)
treeb899eb81a70c7719c5d7e4328697cc314da24b97 /xlators/mgmt/glusterd/src/glusterd-volume-set.c
parentcee1f9b5c7917bba220f1156b342bf07cac4ad38 (diff)
storage/posix: implement batched fsync in a single thread
Because of the extra fsync()s issued by AFR transaction, they could potentially "clog" all the io-threads denying unrelated operations from making progress. This patch assigns a dedicated thread to issues fsyncs, as an experimental feature to understand performance characteristics with the approach. As a basis, incoming individual fsync requests are grouped into batches, falling in the same @batch-fsync-delay-usec window of time. These windows can extend in practice, as processing of the previous batch can take longer than @batch-fsync-delay-usec while new requests are getting batched. The feature support three modes (similar to the -S modes of fs_mark) - syncfs: In this mode one syncfs() is issued per batch, instead of N fsync()s (one per file.) - syncfs-single-fsync: In this mode one syncfs() is issued per batch (which, on Linux, guarantees the completion of write-out of dirty pages in the filesystem up to that point) and one single fsync() to synchronize or flush the controller/drive cache. This corresponds to -S 2 of fsmark. - syncfs-reverse-fsync: In this mode, one syncfs() is issued per batch, and all the open files in that batch are fsync()'ed in the reverse order of the queue. This corresponds to -S 4 of fsmark. - reverse-fsync: In this mode, no syncfs() is issued and all the files in the batch are fsync()'ed in the reverse order. This corresponds to -S 3 of fsmark. Change-Id: Ia1e170a810c780c8d80e02cf910accc4170c4cd4 BUG: 927146 Signed-off-by: Anand Avati <avati@redhat.com> Reviewed-on: http://review.gluster.org/4746 Tested-by: Gluster Build System <jenkins@build.gluster.com> Reviewed-by: Vijay Bellur <vbellur@redhat.com>
Diffstat (limited to 'xlators/mgmt/glusterd/src/glusterd-volume-set.c')
-rw-r--r--xlators/mgmt/glusterd/src/glusterd-volume-set.c8
1 files changed, 8 insertions, 0 deletions
diff --git a/xlators/mgmt/glusterd/src/glusterd-volume-set.c b/xlators/mgmt/glusterd/src/glusterd-volume-set.c
index 6575e252..245b29af 100644
--- a/xlators/mgmt/glusterd/src/glusterd-volume-set.c
+++ b/xlators/mgmt/glusterd/src/glusterd-volume-set.c
@@ -1201,6 +1201,14 @@ struct volopt_map_entry glusterd_volopt_map[] = {
.voltype = "storage/posix",
.op_version = 1
},
+ { .key = "storage.batch-fsync-mode",
+ .voltype = "storage/posix",
+ .op_version = 3
+ },
+ { .key = "storage.batch-fsync-delay-usec",
+ .voltype = "storage/posix",
+ .op_version = 3
+ },
{ .key = "storage.owner-uid",
.voltype = "storage/posix",
.option = "brick-uid",