softirqs: Free up pf flag PF_KSOFTIRQD

Cleanup patch, freeing up PF_KSOFTIRQD and use per_cpu ksoftirqd pointer
instead, as suggested by Eric Dumazet.

Tested-by: Shaun Ruffell <sruffell@digium.com>
Signed-off-by: Venkatesh Pallipadi <venki@google.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <1292980144-28796-2-git-send-email-venki@google.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

diff --git a/include/linux/interrupt.h b/include/linux/interrupt.h
index 55e0d42..a1382b9 100644 (file)
--- a/include/linux/interrupt.h
+++ b/include/linux/interrupt.h
@@ -426,6 +426,13 @@ extern void raise_softirq(unsigned int nr);
  */
 DECLARE_PER_CPU(struct list_head [NR_SOFTIRQS], softirq_work_list);
 
+DECLARE_PER_CPU(struct task_struct *, ksoftirqd);
+
+static inline struct task_struct *this_cpu_ksoftirqd(void)
+{
+       return this_cpu_read(ksoftirqd);
+}
+
 /* Try to send a softirq to a remote cpu.  If this cannot be done, the
  * work will be queued to the local cpu.
  */

diff --git a/include/linux/sched.h b/include/linux/sched.h
index d747f94..af6e15f 100644 (file)
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -1715,7 +1715,6 @@ extern void thread_group_times(struct task_struct *p, cputime_t *ut, cputime_t *
 /*
  * Per process flags
  */
-#define PF_KSOFTIRQD   0x00000001      /* I am ksoftirqd */
 #define PF_STARTING    0x00000002      /* being created */
 #define PF_EXITING     0x00000004      /* getting shut down */
 #define PF_EXITPIDONE  0x00000008      /* pi exit done on shut down */

diff --git a/kernel/sched.c b/kernel/sched.c
index 6820b5b..8b89b3b 100644 (file)
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -1880,7 +1880,7 @@ void account_system_vtime(struct task_struct *curr)
         */
        if (hardirq_count())
                __this_cpu_add(cpu_hardirq_time, delta);
-       else if (in_serving_softirq() && !(curr->flags & PF_KSOFTIRQD))
+       else if (in_serving_softirq() && curr != this_cpu_ksoftirqd())
                __this_cpu_add(cpu_softirq_time, delta);
 
        irq_time_write_end();

diff --git a/kernel/softirq.c b/kernel/softirq.c
index 68eb5ef..0cee504 100644 (file)
--- a/kernel/softirq.c
+++ b/kernel/softirq.c
@@ -54,7 +54,7 @@ EXPORT_SYMBOL(irq_stat);
 
 static struct softirq_action softirq_vec[NR_SOFTIRQS] __cacheline_aligned_in_smp;
 
-static DEFINE_PER_CPU(struct task_struct *, ksoftirqd);
+DEFINE_PER_CPU(struct task_struct *, ksoftirqd);
 
 char *softirq_to_name[NR_SOFTIRQS] = {
        "HI", "TIMER", "NET_TX", "NET_RX", "BLOCK", "BLOCK_IOPOLL",
@@ -721,7 +721,6 @@ static int run_ksoftirqd(void * __bind_cpu)
 {
        set_current_state(TASK_INTERRUPTIBLE);
 
-       current->flags |= PF_KSOFTIRQD;
        while (!kthread_should_stop()) {
                preempt_disable();
                if (!local_softirq_pending()) {