[PATCH 09/27] blk-iocost: use WEIGHT_ONE based fixed point number for weights

[Tejun Heo]

To improve weight donations, we want to able to scale inuse with a greater
accuracy and down below 1. Let's make non-hierarchical weights to use
WEIGHT_ONE based fixed point numbers too like hierarchical ones.

This doesn't cause any behavior changes yet.

Signed-off-by: Tejun Heo <t...@kernel.org>
---
 block/blk-iocost.c | 25 +++++++++++++------------
 1 file changed, 13 insertions(+), 12 deletions(-)

diff --git a/block/blk-iocost.c b/block/blk-iocost.c
index 5e6d56eec1c9..00c5a3ad2b5b 100644
--- a/block/blk-iocost.c
+++ b/block/blk-iocost.c
@@ -984,8 +984,8 @@ static void current_hweight(struct ioc_gq *iocg, u32 
*hw_activep, u32 *hw_inusep
        for (lvl = 0; lvl <= iocg->level - 1; lvl++) {
                struct ioc_gq *parent = iocg->ancestors[lvl];
                struct ioc_gq *child = iocg->ancestors[lvl + 1];
-               u32 active_sum = READ_ONCE(parent->child_active_sum);
-               u32 inuse_sum = READ_ONCE(parent->child_inuse_sum);
+               u64 active_sum = READ_ONCE(parent->child_active_sum);
+               u64 inuse_sum = READ_ONCE(parent->child_inuse_sum);
                u32 active = READ_ONCE(child->active);
                u32 inuse = READ_ONCE(child->inuse);
 
@@ -993,11 +993,11 @@ static void current_hweight(struct ioc_gq *iocg, u32 
*hw_activep, u32 *hw_inusep
                if (!active_sum || !inuse_sum)
                        continue;
 
-               active_sum = max(active, active_sum);
-               hwa = hwa * active / active_sum;        /* max 16bits * 10000 */
+               active_sum = max_t(u64, active, active_sum);
+               hwa = div64_u64((u64)hwa * active, active_sum);
 
-               inuse_sum = max(inuse, inuse_sum);
-               hwi = hwi * inuse / inuse_sum;          /* max 16bits * 10000 */
+               inuse_sum = max_t(u64, inuse, inuse_sum);
+               hwi = div64_u64((u64)hwi * inuse, inuse_sum);
        }
 
        iocg->hweight_active = max_t(u32, hwa, 1);
@@ -1022,7 +1022,8 @@ static void weight_updated(struct ioc_gq *iocg)
        weight = iocg->cfg_weight ?: iocc->dfl_weight;
        if (weight != iocg->weight && iocg->active)
                propagate_weights(iocg, weight,
-                       DIV64_U64_ROUND_UP(iocg->inuse * weight, iocg->weight));
+                                 DIV64_U64_ROUND_UP((u64)iocg->inuse * weight,
+                                                    iocg->weight));
        iocg->weight = weight;
 }
 
@@ -2050,7 +2051,7 @@ static struct blkcg_policy_data *ioc_cpd_alloc(gfp_t gfp)
        if (!iocc)
                return NULL;
 
-       iocc->dfl_weight = CGROUP_WEIGHT_DFL;
+       iocc->dfl_weight = CGROUP_WEIGHT_DFL * WEIGHT_ONE;
        return &iocc->cpd;
 }
 
@@ -2136,7 +2137,7 @@ static u64 ioc_weight_prfill(struct seq_file *sf, struct 
blkg_policy_data *pd,
        struct ioc_gq *iocg = pd_to_iocg(pd);
 
        if (dname && iocg->cfg_weight)
-               seq_printf(sf, "%s %u\n", dname, iocg->cfg_weight);
+               seq_printf(sf, "%s %u\n", dname, iocg->cfg_weight / WEIGHT_ONE);
        return 0;
 }
 
@@ -2146,7 +2147,7 @@ static int ioc_weight_show(struct seq_file *sf, void *v)
        struct blkcg *blkcg = css_to_blkcg(seq_css(sf));
        struct ioc_cgrp *iocc = blkcg_to_iocc(blkcg);
 
-       seq_printf(sf, "default %u\n", iocc->dfl_weight);
+       seq_printf(sf, "default %u\n", iocc->dfl_weight / WEIGHT_ONE);
        blkcg_print_blkgs(sf, blkcg, ioc_weight_prfill,
                          &blkcg_policy_iocost, seq_cft(sf)->private, false);
        return 0;
@@ -2172,7 +2173,7 @@ static ssize_t ioc_weight_write(struct kernfs_open_file 
*of, char *buf,
                        return -EINVAL;
 
                spin_lock(&blkcg->lock);
-               iocc->dfl_weight = v;
+               iocc->dfl_weight = v * WEIGHT_ONE;
                hlist_for_each_entry(blkg, &blkcg->blkg_list, blkcg_node) {
                        struct ioc_gq *iocg = blkg_to_iocg(blkg);
 
@@ -2203,7 +2204,7 @@ static ssize_t ioc_weight_write(struct kernfs_open_file 
*of, char *buf,
        }
 
        spin_lock(&iocg->ioc->lock);
-       iocg->cfg_weight = v;
+       iocg->cfg_weight = v * WEIGHT_ONE;
        weight_updated(iocg);
        spin_unlock(&iocg->ioc->lock);
 
-- 
2.26.2