lkml.org 
[lkml]   [2012]   [Nov]   [28]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    Patch in this message
    /
    From
    Subject[PATCH 04/13] cpuset: introduce CS_ONLINE
    Date
    Add CS_ONLINE which is set from css_online() and cleared from
    css_offline(). This will enable using generic cgroup iterator while
    allowing decoupling cpuset from cgroup internal locking.

    Signed-off-by: Tejun Heo <tj@kernel.org>
    ---
    kernel/cpuset.c | 11 ++++++++++-
    1 file changed, 10 insertions(+), 1 deletion(-)

    diff --git a/kernel/cpuset.c b/kernel/cpuset.c
    index 70197ba..22b521d 100644
    --- a/kernel/cpuset.c
    +++ b/kernel/cpuset.c
    @@ -138,6 +138,7 @@ static inline bool task_has_mempolicy(struct task_struct *task)

    /* bits in struct cpuset flags field */
    typedef enum {
    + CS_ONLINE,
    CS_CPU_EXCLUSIVE,
    CS_MEM_EXCLUSIVE,
    CS_MEM_HARDWALL,
    @@ -154,6 +155,11 @@ enum hotplug_event {
    };

    /* convenient tests for these bits */
    +static inline bool is_cpuset_online(const struct cpuset *cs)
    +{
    + return test_bit(CS_ONLINE, &cs->flags);
    +}
    +
    static inline int is_cpu_exclusive(const struct cpuset *cs)
    {
    return test_bit(CS_CPU_EXCLUSIVE, &cs->flags);
    @@ -190,7 +196,8 @@ static inline int is_spread_slab(const struct cpuset *cs)
    }

    static struct cpuset top_cpuset = {
    - .flags = ((1 << CS_CPU_EXCLUSIVE) | (1 << CS_MEM_EXCLUSIVE)),
    + .flags = ((1 << CS_ONLINE) | (1 << CS_CPU_EXCLUSIVE) |
    + (1 << CS_MEM_EXCLUSIVE)),
    };

    /*
    @@ -1822,6 +1829,7 @@ static int cpuset_css_online(struct cgroup *cgrp)
    if (!parent)
    return 0;

    + set_bit(CS_ONLINE, &cs->flags);
    if (is_spread_page(parent))
    set_bit(CS_SPREAD_PAGE, &cs->flags);
    if (is_spread_slab(parent))
    @@ -1871,6 +1879,7 @@ static void cpuset_css_offline(struct cgroup *cgrp)
    update_flag(CS_SCHED_LOAD_BALANCE, cs, 0);

    number_of_cpusets--;
    + clear_bit(CS_ONLINE, &cs->flags);

    cgroup_unlock();
    }
    --
    1.7.11.7


    \
     
     \ /
      Last update: 2012-11-28 23:21    [W:4.704 / U:0.360 seconds]
    ©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site