linux-kernel - Re: [PATCH] interconnect: Aggregate bandwidth votes for unused nodes in sync

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Date:   Mon, 21 Jun 2021 09:33:19 -0700
From:   Matthias Kaehlcke <mka@...omium.org>
To:     Odelu Kukatla <okukatla@...eaurora.org>
Cc:     georgi.djakov@...aro.org, bjorn.andersson@...aro.org,
        evgreen@...gle.com, Georgi Djakov <djakov@...nel.org>,
        linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org,
        sboyd@...nel.org, mdtipton@...eaurora.org, sibis@...eaurora.org,
        saravanak@...gle.com, seansw@....qualcomm.com, elder@...aro.org,
        linux-arm-msm@...r.kernel.org, linux-arm-msm-owner@...r.kernel.org
Subject: Re: [PATCH] interconnect: Aggregate bandwidth votes for unused nodes
 in sync_state()

On Sat, Jun 19, 2021 at 10:38:29PM +0530, Odelu Kukatla wrote:
> When removing the initial bandwidth votes in sync_state(), make sure
> to call the aggregate() function for nodes which don't have any
> clients yet. aggregate_requests() does not invoke aggregate()
> for unused nodes.
> 
> Signed-off-by: Odelu Kukatla <okukatla@...eaurora.org>

It seems this should have a 'Fixes' tag for b1d681d8d324 ("interconnect:
Add sync state support")', to make sure the change makes it into the
stable trees.

> ---
>  drivers/interconnect/core.c | 11 ++++++++++-
>  1 file changed, 10 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/interconnect/core.c b/drivers/interconnect/core.c
> index 8a1e70e..1d9a00a 100644
> --- a/drivers/interconnect/core.c
> +++ b/drivers/interconnect/core.c
> @@ -1106,7 +1106,16 @@ void icc_sync_state(struct device *dev)
>  		dev_dbg(p->dev, "interconnect provider is in synced state\n");
>  		list_for_each_entry(n, &p->nodes, node_list) {
>  			if (n->init_avg || n->init_peak) {
> -				aggregate_requests(n);
> +				if (hlist_empty(&n->req_list)) {

nit: consider handling the common case in the 'if' branch and the exception of
the initial votes in 'else'.

> +					if (p->pre_aggregate)
> +						p->pre_aggregate(n);
> +
> +					p->aggregate(n, 0, 0, 0, &n->avg_bw,
> +						&n->peak_bw);
> +				} else {
> +					aggregate_requests(n);
> +				}
> +
>  				p->set(n, n);
>  			}
>  		}