From: "Linus Lüssing" <linus.luessing@c0d3.blue>
To: The list for a Better Approach To Mobile Ad-hoc Networking
<b.a.t.m.a.n@lists.open-mesh.org>
Cc: Marek Lindner <mareklindner@neomailbox.ch>
Subject: Re: [B.A.T.M.A.N.] [PATCH v2 6/7] batman-adv: ELP - use tp meter to estimate the throughput if otherwise not available
Date: Mon, 21 May 2018 16:48:55 +0200 [thread overview]
Message-ID: <20180521144854.GO7162@otheros> (raw)
In-Reply-To: <20180518014754.23644-7-mareklindner@neomailbox.ch>
On Fri, May 18, 2018 at 09:47:53AM +0800, Marek Lindner wrote:
> +/**
> + * batadv_v_elp_tp_start() - start a tp meter session for a neighbor
> + * @neigh: neighbor to run tp meter on
> + */
> +static void batadv_v_elp_tp_start(struct batadv_hardif_neigh_node *neigh)
> +{
> + struct batadv_hard_iface *hard_iface = neigh->if_incoming;
> + struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
> +
> + neigh->bat_v.tp_meter_running = true;
> + batadv_tp_start(bat_priv, neigh->addr, neigh, 10, NULL, BATADV_TP_ELP);
> +}
This seems racy here? We have no ordering constraints between
the assigment and batadv_tp_start() which might lead to...
> @@ -152,6 +192,25 @@ static u32 batadv_v_elp_get_throughput(struct batadv_hardif_neigh_node *neigh)
> return throughput * 10;
> }
>
> +fallback_throughput:
> + last_tp_run_jiffies = jiffies - neigh->bat_v.last_tp_meter_run;
> + last_tp_run_msecs = jiffies_to_msecs(last_tp_run_jiffies);
> +
> + /* check the tp_meter_running flag before checking the timestamp to
> + * avoid a race condition where a new tp meter session is scheduled
> + * right after the previous tp meter session has completed
> + */
> + if (!neigh->bat_v.tp_meter_running &&
> + last_tp_run_msecs > BATADV_ELP_TP_RUN_INTERVAL)
> + batadv_v_elp_tp_start(neigh);
...multiple instances potentially being started at the same time here?
next prev parent reply other threads:[~2018-05-21 14:48 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-05-18 1:47 [B.A.T.M.A.N.] [PATCH v2 0/7] B.A.T.M.A.N. V - fallback to tp meter estimation if throughput otherwise not available Marek Lindner
2018-05-18 1:47 ` [B.A.T.M.A.N.] [PATCH v2 1/7] batman-adv: tp_meter - prevent concurrent tp_meter sessions by using workqueue Marek Lindner
2018-08-29 6:56 ` Sven Eckelmann
2018-05-18 1:47 ` [B.A.T.M.A.N.] [PATCH v2 2/7] batman-adv: tp_meter - don't check for existing session Marek Lindner
2018-05-18 1:47 ` [B.A.T.M.A.N.] [PATCH v2 3/7] batman-adv: tp_meter - allow up to 10 queued sessions Marek Lindner
2018-05-18 1:47 ` [B.A.T.M.A.N.] [PATCH v2 4/7] batman-adv: tp_meter - add caller distinction Marek Lindner
2018-05-18 1:47 ` [B.A.T.M.A.N.] [PATCH v2 5/7] batman-adv: tp_meter - add option to perform one-hop test Marek Lindner
2018-05-18 1:47 ` [B.A.T.M.A.N.] [PATCH v2 6/7] batman-adv: ELP - use tp meter to estimate the throughput if otherwise not available Marek Lindner
2018-05-21 13:17 ` Linus Lüssing
2018-05-21 17:51 ` Sven Eckelmann
2018-05-21 19:06 ` Sven Eckelmann
2018-08-04 9:31 ` Antonio Quartulli
2018-05-21 14:43 ` Linus Lüssing
2018-08-04 9:35 ` Marek Lindner
2018-05-21 14:48 ` Linus Lüssing [this message]
2018-08-04 9:39 ` Antonio Quartulli
2018-05-21 15:01 ` Linus Lüssing
2018-08-04 8:59 ` Antonio Quartulli
2018-05-21 16:36 ` Sven Eckelmann
2018-05-18 1:47 ` [B.A.T.M.A.N.] [PATCH v2 7/7] batman-adv: ELP - add throughput meter test duration attribute Marek Lindner
2018-05-21 13:46 ` Linus Lüssing
2018-05-21 13:57 ` Linus Lüssing
2018-08-04 9:05 ` Marek Lindner
2018-05-21 14:34 ` Sven Eckelmann
2018-08-04 8:41 ` Antonio Quartulli
2018-08-04 9:02 ` Sven Eckelmann
2018-08-04 9:08 ` Antonio Quartulli
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