[PATCH] aio: remove ki_retried debugging member

Remove the ki_retried member from struct kiocb.  I think the idea was
bounced around a while back, but Arnaldo pointed out another reason that we
should dig it up when he pointed out that the last cacheline of struct
kiocb only contains 4 bytes.  By removing the debugging member, we save
more than the 8 byte on 64 bit machines.

Signed-off-by: Benjamin LaHaise <bcrl@kvack.org>
Acked-by: Ken Chen <kenneth.w.chen@intel.com>
Acked-by: Zach Brown <zach.brown@oracle.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

diff --git a/fs/aio.c b/fs/aio.c
index f02ad26..d3a6ec2 100644 (file)
--- a/fs/aio.c
+++ b/fs/aio.c
@@ -666,17 +666,6 @@ static ssize_t aio_run_iocb(struct kiocb *iocb)
        ssize_t (*retry)(struct kiocb *);
        ssize_t ret;
 
-       if (iocb->ki_retried++ > 1024*1024) {
-               printk("Maximal retry count.  Bytes done %Zd\n",
-                       iocb->ki_nbytes - iocb->ki_left);
-               return -EAGAIN;
-       }
-
-       if (!(iocb->ki_retried & 0xff)) {
-               pr_debug("%ld retry: %zd of %zd\n", iocb->ki_retried,
-                       iocb->ki_nbytes - iocb->ki_left, iocb->ki_nbytes);
-       }
-
        if (!(retry = iocb->ki_retry)) {
                printk("aio_run_iocb: iocb->ki_retry = NULL\n");
                return 0;
@@ -1005,9 +994,6 @@ int fastcall aio_complete(struct kiocb *iocb, long res, long res2)
        kunmap_atomic(ring, KM_IRQ1);
 
        pr_debug("added to ring %p at [%lu]\n", iocb, tail);
-
-       pr_debug("%ld retries: %zd of %zd\n", iocb->ki_retried,
-               iocb->ki_nbytes - iocb->ki_left, iocb->ki_nbytes);
 put_rq:
        /* everything turned out well, dispose of the aiocb. */
        ret = __aio_put_req(ctx, iocb);
@@ -1590,7 +1576,6 @@ int fastcall io_submit_one(struct kioctx *ctx, struct iocb __user *user_iocb,
        req->ki_opcode = iocb->aio_lio_opcode;
        init_waitqueue_func_entry(&req->ki_wait, aio_wake_function);
        INIT_LIST_HEAD(&req->ki_wait.task_list);
-       req->ki_retried = 0;
 
        ret = aio_setup_iocb(req);
 

diff --git a/include/linux/aio.h b/include/linux/aio.h
index 9e350fd..3372ec6 100644 (file)
--- a/include/linux/aio.h
+++ b/include/linux/aio.h
@@ -111,7 +111,6 @@ struct kiocb {
        size_t                  ki_nbytes;      /* copy of iocb->aio_nbytes */
        char                    __user *ki_buf; /* remaining iocb->aio_buf */
        size_t                  ki_left;        /* remaining bytes */
-       long                    ki_retried;     /* just for testing */
        struct iovec            ki_inline_vec;  /* inline vector */
        struct iovec            *ki_iovec;
        unsigned long           ki_nr_segs;
@@ -238,7 +237,6 @@ do {                                                                        \
 } while (0)
 
 #define io_wait_to_kiocb(wait) container_of(wait, struct kiocb, ki_wait)
-#define is_retried_kiocb(iocb) ((iocb)->ki_retried > 1)
 
 #include <linux/aio_abi.h>