sched: Add a comment to effective_load() since it's a pain

Every time I have to stare at this function I need to completely
reverse engineer its workings, about time I write a comment
explaining the thing.

Collected bits and pieces from previous changelogs, mostly:

  4be9daaa1b33701f011f4117f22dc1e45a3e6e34
  83378269a5fad98f562ebc0f09c349575e6cbfe1

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1318518057.27731.2.camel@twins
Signed-off-by: Ingo Molnar <mingo@elte.hu>

diff --git a/kernel/sched_fair.c b/kernel/sched_fair.c
index 5c9e67923b7cfd7826903c17322c3f0c55de5d74..aba20f495188f89c2609dbc74730b8caa414b292 100644 (file)
--- a/kernel/sched_fair.c
+++ b/kernel/sched_fair.c
@@ -772,19 +772,32 @@ static void update_cfs_load(struct cfs_rq *cfs_rq, int global_update)
                list_del_leaf_cfs_rq(cfs_rq);
 }
 
+static inline long calc_tg_weight(struct task_group *tg, struct cfs_rq *cfs_rq)
+{
+       long tg_weight;
+
+       /*
+        * Use this CPU's actual weight instead of the last load_contribution
+        * to gain a more accurate current total weight. See
+        * update_cfs_rq_load_contribution().
+        */
+       tg_weight = atomic_read(&tg->load_weight);
+       tg_weight -= cfs_rq->load_contribution;
+       tg_weight += cfs_rq->load.weight;
+
+       return tg_weight;
+}
+
 static long calc_cfs_shares(struct cfs_rq *cfs_rq, struct task_group *tg)
 {
-       long load_weight, load, shares;
+       long tg_weight, load, shares;
 
+       tg_weight = calc_tg_weight(tg, cfs_rq);
        load = cfs_rq->load.weight;
 
-       load_weight = atomic_read(&tg->load_weight);
-       load_weight += load;
-       load_weight -= cfs_rq->load_contribution;
-
        shares = (tg->shares * load);
-       if (load_weight)
-               shares /= load_weight;
+       if (tg_weight)
+               shares /= tg_weight;
 
        if (shares < MIN_SHARES)
                shares = MIN_SHARES;
@@ -2036,36 +2049,100 @@ static void task_waking_fair(struct task_struct *p)
  * Adding load to a group doesn't make a group heavier, but can cause movement
  * of group shares between cpus. Assuming the shares were perfectly aligned one
  * can calculate the shift in shares.
+ *
+ * Calculate the effective load difference if @wl is added (subtracted) to @tg
+ * on this @cpu and results in a total addition (subtraction) of @wg to the
+ * total group weight.
+ *
+ * Given a runqueue weight distribution (rw_i) we can compute a shares
+ * distribution (s_i) using:
+ *
+ *   s_i = rw_i / \Sum rw_j                                            (1)
+ *
+ * Suppose we have 4 CPUs and our @tg is a direct child of the root group and
+ * has 7 equal weight tasks, distributed as below (rw_i), with the resulting
+ * shares distribution (s_i):
+ *
+ *   rw_i = {   2,   4,   1,   0 }
+ *   s_i  = { 2/7, 4/7, 1/7,   0 }
+ *
+ * As per wake_affine() we're interested in the load of two CPUs (the CPU the
+ * task used to run on and the CPU the waker is running on), we need to
+ * compute the effect of waking a task on either CPU and, in case of a sync
+ * wakeup, compute the effect of the current task going to sleep.
+ *
+ * So for a change of @wl to the local @cpu with an overall group weight change
+ * of @wl we can compute the new shares distribution (s'_i) using:
+ *
+ *   s'_i = (rw_i + @wl) / (@wg + \Sum rw_j)                           (2)
+ *
+ * Suppose we're interested in CPUs 0 and 1, and want to compute the load
+ * differences in waking a task to CPU 0. The additional task changes the
+ * weight and shares distributions like:
+ *
+ *   rw'_i = {   3,   4,   1,   0 }
+ *   s'_i  = { 3/8, 4/8, 1/8,   0 }
+ *
+ * We can then compute the difference in effective weight by using:
+ *
+ *   dw_i = S * (s'_i - s_i)                                           (3)
+ *
+ * Where 'S' is the group weight as seen by its parent.
+ *
+ * Therefore the effective change in loads on CPU 0 would be 5/56 (3/8 - 2/7)
+ * times the weight of the group. The effect on CPU 1 would be -4/56 (4/8 -
+ * 4/7) times the weight of the group.
  */
 static long effective_load(struct task_group *tg, int cpu, long wl, long wg)
 {
        struct sched_entity *se = tg->se[cpu];
 
-       if (!tg->parent)
+       if (!tg->parent)        /* the trivial, non-cgroup case */
                return wl;
 
        for_each_sched_entity(se) {
-               long lw, w;
+               long w, W;
 
                tg = se->my_q->tg;
-               w = se->my_q->load.weight;
 
-               /* use this cpu's instantaneous contribution */
-               lw = atomic_read(&tg->load_weight);
-               lw -= se->my_q->load_contribution;
-               lw += w + wg;
+               /*
+                * W = @wg + \Sum rw_j
+                */
+               W = wg + calc_tg_weight(tg, se->my_q);
 
-               wl += w;
+               /*
+                * w = rw_i + @wl
+                */
+               w = se->my_q->load.weight + wl;
 
-               if (lw > 0 && wl < lw)
-                       wl = (wl * tg->shares) / lw;
+               /*
+                * wl = S * s'_i; see (2)
+                */
+               if (W > 0 && w < W)
+                       wl = (w * tg->shares) / W;
                else
                        wl = tg->shares;
 
-               /* zero point is MIN_SHARES */
+               /*
+                * Per the above, wl is the new se->load.weight value; since
+                * those are clipped to [MIN_SHARES, ...) do so now. See
+                * calc_cfs_shares().
+                */
                if (wl < MIN_SHARES)
                        wl = MIN_SHARES;
+
+               /*
+                * wl = dw_i = S * (s'_i - s_i); see (3)
+                */
                wl -= se->load.weight;
+
+               /*
+                * Recursively apply this logic to all parent groups to compute
+                * the final effective load change on the root group. Since
+                * only the @tg group gets extra weight, all parent groups can
+                * only redistribute existing shares. @wl is the shift in shares
+                * resulting from this level per the above.
+                */
                wg = 0;
        }