LU-13799 clio: Implement real list splice

Lustre's list_splice is actually just a slightly
depressing list_for_each; let's use a real list_splice.

This saves significant time in AIO/DIO page submission,
getting a several % performance boost.

This patch reduces i/o time in ms/GiB by:
Write: 16 ms/GiB
Read: 14 ms/GiB

Totals:
Write: 220 ms/GiB
Read: 209 ms/GiB

mpirun -np 1  $IOR -w -r -t 64M -b 64G -o ./iorfile --posix.odirect

With previous patches in series:
write     4326 MiB/s
read      4587 MiB/s

With this patch:
write     4647 MiB/s
read      4888 MiB/s

Lustre-change: https://review.whamcloud.com/39439
Lustre-commit: dfe2d225b86d4215cbd09e863e8de7547f0d4dae

Signed-off-by: Patrick Farrell <farr0186@gmail.com>
Change-Id: Icfd4a3d9dd6f162b011b402a1c88d7dae53eff40
Reviewed-on: https://review.whamcloud.com/39439
Reviewed-by: Wang Shilong <wshilong@whamcloud.com>
Reviewed-by: Bobi Jam <bobijam@hotmail.com>
Tested-by: jenkins <devops@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-on: https://review.whamcloud.com/44440

diff --git a/lustre/obdclass/cl_io.c b/lustre/obdclass/cl_io.c
index 80fb8e1..32e4b00 100644 (file)
--- a/lustre/obdclass/cl_io.c
+++ b/lustre/obdclass/cl_io.c
@@ -905,15 +905,24 @@ EXPORT_SYMBOL(cl_page_list_move_head);
 /**
  * splice the cl_page_list, just as list head does
  */
-void cl_page_list_splice(struct cl_page_list *list, struct cl_page_list *head)
+void cl_page_list_splice(struct cl_page_list *src, struct cl_page_list *dst)
 {
+#ifdef USE_LU_REF
        struct cl_page *page;
        struct cl_page *tmp;
 
 
        ENTRY;
        cl_page_list_for_each_safe(page, tmp, list)
-               cl_page_list_move(head, list, page);
+               lu_ref_set_at(&page->cp_reference, &page->cp_queue_ref,
+                             "queue", src, dst);
+#else
+       ENTRY;
+#endif
+       dst->pl_nr += src->pl_nr;
+       src->pl_nr = 0;
+       list_splice_tail_init(&src->pl_pages, &dst->pl_pages);
+
        EXIT;
 }
 EXPORT_SYMBOL(cl_page_list_splice);