7/9: cpu_shares_n_stats
Adds routine to change share values and show statistics.
Signed-off-by: MAEDA Naoaki <[email protected]>
Signed-off-by: Kurosawa Takahiro <[email protected]>
kernel/res_group/cpu.c | 120 +++++++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 120 insertions(+)
Index: linux-2.6.17-rc3/kernel/res_group/cpu.c
===================================================================
--- linux-2.6.17-rc3.orig/kernel/res_group/cpu.c
+++ linux-2.6.17-rc3/kernel/res_group/cpu.c
@@ -113,12 +113,132 @@ static void cpu_free_shares_struct(struc
kfree(res);
}
+static int recalc_shares(int self_shares, int parent_shares, int parent_divisor)
+{
+ u64 numerator;
+
+ if (parent_divisor == 0)
+ return 0;
+ numerator = (u64) self_shares * parent_shares;
+ do_div(numerator, parent_divisor);
+ return numerator;
+}
+
+static int recalc_unused_shares(int self_cnt_min_shares,
+ int self_unused_min_shares, int self_divisor)
+{
+ u64 numerator;
+
+ if (self_divisor == 0)
+ return 0;
+ numerator = (u64) self_unused_min_shares * self_cnt_min_shares;
+ do_div(numerator, self_divisor);
+ return numerator;
+}
+
+static void recalc_self(struct cpu_res *res, struct cpu_res *parres)
+{
+ struct res_shares *par = &parres->shares;
+ struct res_shares *self = &res->shares;
+ u64 cnt_total, cnt_min_shares;
+
+ /* calculate total and current min_shares */
+ cnt_total = recalc_shares(self->min_shares,
+ parres->cnt_total_min_shares,
+ par->child_shares_divisor);
+ cnt_min_shares = recalc_unused_shares(self->unused_min_shares,
+ cnt_total,
+ par->child_shares_divisor);
+ cpu_rc_set_share(&res->cpu_rc, (int) cnt_min_shares);
+ res->cnt_total_min_shares = (int) cnt_total;
+}
+
+static void
+recalc_and_propagate(struct cpu_res *res)
+{
+ struct resource_group *child = NULL;
+ struct cpu_res *parres, *childres;
+
+ parres = get_res_group_cpu(res->rgroup->parent);
+
+ if (parres)
+ recalc_self(res, parres);
+
+ /* propagate to children */
+ spin_lock(&res->rgroup->group_lock);
+ for_each_child(child, res->rgroup) {
+ childres = get_res_group_cpu(child);
+ if (childres)
+ recalc_and_propagate(childres);
+ }
+ spin_unlock(&res->rgroup->group_lock);
+ return;
+}
+
+static void cpu_shares_changed(struct res_shares *my_res)
+{
+ struct cpu_res *parres, *res;
+ struct res_shares *cur, *par;
+ u64 temp = 0;
+
+ res = get_shares_cpu(my_res);
+ if (!res)
+ return;
+ cur = &res->shares;
+
+ if (!is_res_group_root(res->rgroup)) {
+ spin_lock(&res->rgroup->parent->group_lock);
+ parres = get_res_group_cpu(res->rgroup->parent);
+ par = &parres->shares;
+ } else {
+ par = NULL;
+ parres = NULL;
+ }
+
+ if (parres) {
+ /* adjust parent's unused min_shares */
+ temp = recalc_unused_shares(parres->cnt_total_min_shares,
+ par->unused_min_shares,
+ par->child_shares_divisor);
+ cpu_rc_set_share(&parres->cpu_rc, temp);
+ } else {
+ /* adjust root resouce group's unused min_shares */
+ temp = recalc_unused_shares(SHARE_DEFAULT_DIVISOR,
+ cur->unused_min_shares,
+ cur->child_shares_divisor);
+ cpu_rc_set_share(&res->cpu_rc, temp);
+ }
+ recalc_and_propagate(res);
+
+ if (!is_res_group_root(res->rgroup))
+ spin_unlock(&res->rgroup->parent->group_lock);
+}
+
+static ssize_t cpu_show_stats(struct res_shares *my_res, char *buf,
+ size_t buf_size)
+{
+ struct cpu_res *res;
+ unsigned int load = 0;
+ ssize_t i;
+
+ res = get_shares_cpu(my_res);
+ if (!res)
+ return -EINVAL;
+
+ load = cpu_rc_load(&res->cpu_rc);
+ i = snprintf(buf, buf_size, "%s:effective_min_shares=%d, load=%d\n",
+ res_ctlr_name, res->cpu_rc.share, load);
+ return i;
+}
+
struct res_controller cpu_ctlr = {
.name = res_ctlr_name,
.depth_supported = 3,
.ctlr_id = NO_RES_ID,
.alloc_shares_struct = cpu_alloc_shares_struct,
.free_shares_struct = cpu_free_shares_struct,
+ .shares_changed = cpu_shares_changed,
+ .show_stats = cpu_show_stats,
};
int __init init_cpu_res(void)
-
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