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Message-ID: <20060820174256.GC13917@in.ibm.com>
Date: Sun, 20 Aug 2006 23:12:56 +0530
From: Srivatsa Vaddagiri <vatsa@...ibm.com>
To: Ingo Molnar <mingo@...e.hu>, Nick Piggin <nickpiggin@...oo.com.au>
Cc: Sam Vilain <sam@...ain.net>, linux-kernel@...r.kernel.org,
Kirill Korotaev <dev@...nvz.org>,
Mike Galbraith <efault@....de>,
Balbir Singh <balbir@...ibm.com>, sekharan@...ibm.com,
Andrew Morton <akpm@...l.org>, nagar@...son.ibm.com,
matthltc@...ibm.com, dipankar@...ibm.com
Subject: [PATCH 2/7] CPU controller V1 - define group operations
Define these operations for a task-group:
- create new group
- destroy existing group
- assign bandwidth (quota) for a group
- get bandwidth (quota) of a group
Signed-off-by : Srivatsa Vaddagiri <vatsa@...ibm.com>
include/linux/sched.h | 13 +++++++
kernel/sched.c | 85 ++++++++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 98 insertions(+)
diff -puN kernel/sched.c~cpu_ctlr_grp_ops kernel/sched.c
--- linux-2.6.18-rc3/kernel/sched.c~cpu_ctlr_grp_ops 2006-08-20 21:54:17.000000000 +0530
+++ linux-2.6.18-rc3-root/kernel/sched.c 2006-08-20 21:55:28.000000000 +0530
@@ -7066,3 +7066,88 @@ void set_curr_task(int cpu, struct task_
}
#endif
+
+#ifdef CONFIG_CPUMETER
+
+/* Allocate runqueue structures for the new task-group */
+void *sched_alloc_group(void)
+{
+ struct task_grp *tg;
+ struct task_grp_rq *tgrq;
+ int i;
+
+ tg = kzalloc(sizeof(*tg), GFP_KERNEL);
+ if (!tg)
+ return NULL;
+
+ tg->ticks = -1; /* No limit */
+
+ for_each_possible_cpu(i) {
+ tgrq = kzalloc(sizeof(*tgrq), GFP_KERNEL);
+ if (!tgrq)
+ goto oom;
+ tg->rq[i] = tgrq;
+ task_grp_rq_init(tgrq, tg);
+ }
+
+ return tg;
+oom:
+ while (i--)
+ kfree(tg->rq[i]);
+
+ kfree(tg);
+ return NULL;
+}
+
+/* Deallocate runqueue structures */
+void sched_dealloc_group(struct task_grp *tg)
+{
+ int i;
+
+ for_each_possible_cpu(i)
+ kfree(tg->rq[i]);
+
+ kfree(tg);
+}
+
+/* Assign quota to this group */
+void sched_assign_quota(struct task_grp *tg, int quota)
+{
+ int i;
+
+ /* xxx: check validity of quota */
+ tg->ticks = (quota * 5 * HZ) / 100;
+
+ for_each_possible_cpu(i)
+ tg->rq[i]->ticks = tg->ticks;
+
+}
+
+static inline int cpu_quota(struct task_grp *tg)
+{
+ int val;
+
+ if (tg->ticks == -1)
+ val = 100;
+ else
+ val = (tg->ticks * 100) / (5 * HZ);
+
+ return val;
+}
+
+/* Return assigned quota for this group */
+int sched_get_quota(struct task_grp *tg)
+{
+ return cpu_quota(tg);
+}
+
+static struct task_grp_ops sched_grp_ops = {
+ .alloc_group = sched_alloc_group,
+ .dealloc_group = sched_dealloc_group,
+ .assign_quota = sched_assign_quota,
+ .get_quota = sched_get_quota,
+};
+
+struct task_grp_ops *cpu_ctlr = &sched_grp_ops;
+
+#endif /* CONFIG_CPUMETER */
diff -puN include/linux/sched.h~cpu_ctlr_grp_ops include/linux/sched.h
--- linux-2.6.18-rc3/include/linux/sched.h~cpu_ctlr_grp_ops 2006-08-20 21:54:17.000000000 +0530
+++ linux-2.6.18-rc3-root/include/linux/sched.h 2006-08-20 21:54:17.000000000 +0530
@@ -1604,6 +1604,19 @@ static inline void thaw_processes(void)
static inline int try_to_freeze(void) { return 0; }
#endif /* CONFIG_PM */
+
+#ifdef CONFIG_CPUMETER
+struct task_grp;
+struct task_grp_ops {
+ void *(*alloc_group)(void);
+ void (*dealloc_group)(struct task_grp *grp);
+ void (*assign_quota)(struct task_grp *grp, int quota);
+ int (*get_quota)(struct task_grp *grp);
+};
+
+extern struct task_grp_ops *cpu_ctlr;
+#endif
+
#endif /* __KERNEL__ */
#endif
_
--
Regards,
vatsa
-
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