Add support for the iomem_align option
This allows detailed control of the alignment of the IO buffers
that fio uses.
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
diff --git a/fio.c b/fio.c
index 4927f1c..63d9a1b 100644
--- a/fio.c
+++ b/fio.c
@@ -42,7 +42,8 @@
unsigned long page_mask;
unsigned long page_size;
-#define ALIGN(buf) \
+
+#define PAGE_ALIGN(buf) \
(char *) (((unsigned long) (buf) + page_mask) & ~page_mask)
int groupid = 0;
@@ -790,8 +791,8 @@
if (allocate_io_mem(td))
return 1;
- if (td->o.odirect)
- p = ALIGN(td->orig_buffer);
+ if (td->o.mem_align)
+ p = PAGE_ALIGN(td->orig_buffer) + td->o.mem_align;
else
p = td->orig_buffer;
@@ -811,9 +812,11 @@
io_u = ptr;
memset(io_u, 0, sizeof(*io_u));
INIT_FLIST_HEAD(&io_u->list);
+ dprint(FD_MEM, "io_u alloc %p, index %u\n", io_u, i);
if (!(td->io_ops->flags & FIO_NOIO)) {
io_u->buf = p + max_bs * i;
+ dprint(FD_MEM, "io_u %p, mem %p\n", io_u, io_u->buf);
if (td_write(td) && !td->o.refill_buffers)
io_u_fill_buffer(td, io_u, max_bs);