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    Subject[PATCH 07/21] mm: mm_struct hiwaters moved
    Slight and timid rearrangement of mm_struct: hiwater_rss and hiwater_vm
    were tacked on the end, but it seems better to keep them near _file_rss,
    _anon_rss and total_vm, in the same cacheline on those arches verified.

    There are likely to be more profitable rearrangements, but less obvious
    (is it good or bad that saved_auxv[AT_VECTOR_SIZE] isolates cpu_vm_mask
    and context from many others?), needing serious instrumentation.

    Signed-off-by: Hugh Dickins <hugh@veritas.com>
    ---

    include/linux/sched.h | 19 +++++++++----------
    1 files changed, 9 insertions(+), 10 deletions(-)

    --- mm06/include/linux/sched.h 2005-10-11 23:54:33.000000000 +0100
    +++ mm07/include/linux/sched.h 2005-10-11 23:55:22.000000000 +0100
    @@ -280,16 +280,19 @@ struct mm_struct {
    * by mmlist_lock
    */

    - unsigned long start_code, end_code, start_data, end_data;
    - unsigned long start_brk, brk, start_stack;
    - unsigned long arg_start, arg_end, env_start, env_end;
    - unsigned long total_vm, locked_vm, shared_vm;
    - unsigned long exec_vm, stack_vm, reserved_vm, def_flags, nr_ptes;
    -
    /* Special counters protected by the page_table_lock */
    mm_counter_t _file_rss;
    mm_counter_t _anon_rss;

    + unsigned long hiwater_rss; /* High-watermark of RSS usage */
    + unsigned long hiwater_vm; /* High-water virtual memory usage */
    +
    + unsigned long total_vm, locked_vm, shared_vm, exec_vm;
    + unsigned long stack_vm, reserved_vm, def_flags, nr_ptes;
    + unsigned long start_code, end_code, start_data, end_data;
    + unsigned long start_brk, brk, start_stack;
    + unsigned long arg_start, arg_end, env_start, env_end;
    +
    unsigned long saved_auxv[AT_VECTOR_SIZE]; /* for /proc/PID/auxv */

    unsigned dumpable:2;
    @@ -309,11 +312,7 @@ struct mm_struct {
    /* aio bits */
    rwlock_t ioctx_list_lock;
    struct kioctx *ioctx_list;
    -
    struct kioctx default_kioctx;
    -
    - unsigned long hiwater_rss; /* High-water RSS usage */
    - unsigned long hiwater_vm; /* High-water virtual memory usage */
    };

    struct sighand_struct {
    -
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