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authorRaghavendra G <raghavendra@gluster.com>2009-09-22 01:38:12 +0000
committerAnand V. Avati <avati@dev.gluster.com>2009-09-22 06:13:10 -0700
commit8a0d85eb936f9483a5d23d67cf5989351d5f86d7 (patch)
tree8f59fec1755469d16a53bf0912bed02a55fe584a
parentecb8f4dfce0bfdba8d14532231a7596a73def38e (diff)
performance/write-behind: Aggregate adjacent contiguous write-buffers into single iobuf.
Signed-off-by: Anand V. Avati <avati@dev.gluster.com> BUG: 276 (write behind needs to be optimized.) URL: http://bugs.gluster.com/cgi-bin/bugzilla3/show_bug.cgi?id=276
-rw-r--r--xlators/performance/write-behind/src/write-behind.c78
1 files changed, 77 insertions, 1 deletions
diff --git a/xlators/performance/write-behind/src/write-behind.c b/xlators/performance/write-behind/src/write-behind.c
index d5eefed233e..b38f1665b0b 100644
--- a/xlators/performance/write-behind/src/write-behind.c
+++ b/xlators/performance/write-behind/src/write-behind.c
@@ -53,6 +53,7 @@ typedef struct wb_file {
int32_t op_ret;
int32_t op_errno;
list_head_t request;
+ list_head_t passive_requests;
fd_t *fd;
gf_lock_t lock;
xlator_t *this;
@@ -262,6 +263,7 @@ wb_file_create (xlator_t *this, fd_t *fd)
}
INIT_LIST_HEAD (&file->request);
+ INIT_LIST_HEAD (&file->passive_requests);
/*
fd_ref() not required, file should never decide the existance of
@@ -1596,6 +1598,70 @@ out:
}
+/* this procedure assumes that write requests have only one vector to write */
+void
+__wb_collapse_write_bufs (list_head_t *requests, size_t page_size)
+{
+
+ off_t offset_expected = 0;
+ size_t space_left = 0, length = 0, *iov_len = NULL;
+ char *ptr = NULL, first_request = 1;
+ wb_request_t *request = NULL, *tmp = NULL;
+
+ list_for_each_entry_safe (request, tmp, requests, list) {
+ if ((request->stub->fop != GF_FOP_WRITE)
+ || (request->flags.write_request.stack_wound)) {
+ space_left = 0;
+ ptr = NULL;
+ first_request = 1;
+ continue;
+ }
+
+ if (request->flags.write_request.write_behind) {
+ length = iov_length (request->stub->args.writev.vector,
+ request->stub->args.writev.count);
+
+ if (first_request) {
+ first_request = 0;
+ offset_expected = request->stub->args.writev.off;
+ }
+
+ if (request->stub->args.writev.off != offset_expected) {
+ offset_expected = request->stub->args.writev.off + length;
+ space_left = page_size - length;
+ ptr = request->stub->args.writev.vector[0].iov_base
+ + length;
+ iov_len = &request->stub->args.writev.vector[0].iov_len;
+ continue;
+ }
+
+ if (space_left >= length) {
+ iov_unload (ptr,
+ request->stub->args.writev.vector,
+ request->stub->args.writev.count);
+ space_left -= length;
+ ptr += length;
+ *iov_len = *iov_len + length;
+
+ list_move_tail (&request->list,
+ &request->file->passive_requests);
+
+ __wb_request_unref (request);
+ } else {
+ space_left = page_size - length;
+ ptr = request->stub->args.writev.vector[0].iov_base
+ + length;
+ iov_len = &request->stub->args.writev.vector[0].iov_len;
+ }
+ } else {
+ break;
+ }
+
+ offset_expected += length;
+ }
+}
+
+
int32_t
wb_process_queue (call_frame_t *frame, wb_file_t *file, char flush_all)
{
@@ -1617,6 +1683,17 @@ wb_process_queue (call_frame_t *frame, wb_file_t *file, char flush_all)
size = conf->aggregate_size;
LOCK (&file->lock);
{
+ /*
+ * make sure requests are marked for unwinding and adjacent
+ * continguous write buffers (each of size less than that of
+ * an iobuf) are packed properly so that iobufs are filled to
+ * their maximum capacity, before calling __wb_mark_winds.
+ */
+ __wb_mark_unwinds (&file->request, &unwinds, conf->window_size);
+
+ __wb_collapse_write_bufs (&file->request,
+ file->this->ctx->page_size);
+
count = __wb_get_other_requests (&file->request,
&other_requests);
@@ -1625,7 +1702,6 @@ wb_process_queue (call_frame_t *frame, wb_file_t *file, char flush_all)
flush_all);
}
- __wb_mark_unwinds (&file->request, &unwinds, conf->window_size);
}
UNLOCK (&file->lock);