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    Subject[PATCH v3 06/11] mm/page_alloc: when handling percpu_pagelist_fraction, don't unneedly recalulate high
    Date
    Simply moves calculation of the new 'high' value outside the
    for_each_possible_cpu() loop, as it does not depend on the cpu.

    Signed-off-by: Cody P Schafer <cody@linux.vnet.ibm.com>
    ---
    mm/page_alloc.c | 10 ++++------
    1 file changed, 4 insertions(+), 6 deletions(-)

    diff --git a/mm/page_alloc.c b/mm/page_alloc.c
    index 5c54a08..3447a4b 100644
    --- a/mm/page_alloc.c
    +++ b/mm/page_alloc.c
    @@ -5509,7 +5509,6 @@ int lowmem_reserve_ratio_sysctl_handler(ctl_table *table, int write,
    * cpu. It is the fraction of total pages in each zone that a hot per cpu pagelist
    * can have before it gets flushed back to buddy allocator.
    */
    -
    int percpu_pagelist_fraction_sysctl_handler(ctl_table *table, int write,
    void __user *buffer, size_t *length, loff_t *ppos)
    {
    @@ -5523,12 +5522,11 @@ int percpu_pagelist_fraction_sysctl_handler(ctl_table *table, int write,

    mutex_lock(&pcp_batch_high_lock);
    for_each_populated_zone(zone) {
    - for_each_possible_cpu(cpu) {
    - unsigned long high;
    - high = zone->managed_pages / percpu_pagelist_fraction;
    + unsigned long high;
    + high = zone->managed_pages / percpu_pagelist_fraction;
    + for_each_possible_cpu(cpu)
    setup_pagelist_highmark(
    - per_cpu_ptr(zone->pageset, cpu), high);
    - }
    + per_cpu_ptr(zone->pageset, cpu), high);
    }
    mutex_unlock(&pcp_batch_high_lock);
    return 0;
    --
    1.8.2.1


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