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    Subject[patch 05/13] io-accounting: read accounting
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    Date
    From: Andrew Morton <akpm@osdl.org>

    Wire up read accounting for block devices, within submit_bio().

    Cc: Jay Lan <jlan@sgi.com>
    Cc: Shailabh Nagar <nagar@watson.ibm.com>
    Cc: Balbir Singh <balbir@in.ibm.com>
    Cc: Chris Sturtivant <csturtiv@sgi.com>
    Cc: Tony Ernst <tee@sgi.com>
    Cc: Guillaume Thouvenin <guillaume.thouvenin@bull.net>
    Cc: David Wright <daw@sgi.com>
    Signed-off-by: Andrew Morton <akpm@osdl.org>
    ---

    block/ll_rw_blk.c | 7 +++++--
    1 file changed, 5 insertions(+), 2 deletions(-)

    diff -puN block/ll_rw_blk.c~io-accounting-read-accounting-2 block/ll_rw_blk.c
    --- a/block/ll_rw_blk.c~io-accounting-read-accounting-2
    +++ a/block/ll_rw_blk.c
    @@ -25,6 +25,7 @@
    #include <linux/slab.h>
    #include <linux/swap.h>
    #include <linux/writeback.h>
    +#include <linux/task_io_accounting_ops.h>
    #include <linux/interrupt.h>
    #include <linux/cpu.h>
    #include <linux/blktrace_api.h>
    @@ -3235,10 +3236,12 @@ void submit_bio(int rw, struct bio *bio)
    BIO_BUG_ON(!bio->bi_size);
    BIO_BUG_ON(!bio->bi_io_vec);
    bio->bi_rw |= rw;
    - if (rw & WRITE)
    + if (rw & WRITE) {
    count_vm_events(PGPGOUT, count);
    - else
    + } else {
    + task_io_account_read(bio->bi_size);
    count_vm_events(PGPGIN, count);
    + }

    if (unlikely(block_dump)) {
    char b[BDEVNAME_SIZE];
    _
    -
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