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Date:   Wed, 9 Dec 2020 10:25:43 -0800
From:   Jakub Kicinski <>
To:     Vladimir Oltean <>
Cc:     "David S . Miller" <>,
        "" <>,
        "" <>,
        Alexandre Belloni <>,
        Andrew Lunn <>,
        Florian Fainelli <>,
        Vivien Didelot <>,
        Horatiu Vultur <>,
        "Allan W . Nielsen" <>,
        Claudiu Manoil <>,
        Steen Hegelund <>
Subject: Re: [PATCH v3 net-next] net: mscc: ocelot: install MAC addresses in
 .ndo_set_rx_mode from process context

On Wed, 9 Dec 2020 01:56:14 +0000 Vladimir Oltean wrote:
> On Mon, Dec 07, 2020 at 05:09:37PM -0800, Jakub Kicinski wrote:
> > > +	ocelot->owq = alloc_ordered_workqueue("ocelot-owq", WQ_MEM_RECLAIM);  
> >
> > Why MEM_RECLAIM ?  
> Ok, fine, I admit, I copied it.
> After reading the documentation a bit more thoroughly, I am still as
> clear about the guidelines as before. The original logic was, I am
> allocating a memory area and then freeing it from the work item. So it
> must be beneficial for the kernel to want to flush this workqueue during
> the memory reclaim process / under memory pressure, because I am doing
> no memory allocation, and I am also freeing some memory in fact.
> The thing is, there are already a lot of users of WQ_MEM_RECLAIM. Many
> outside of the filesystem/block subsystems. Not sure if all of them
> misuse it, or how to even tell which one constitutes a correct example
> of usage for WQ_MEM_RECLAIM.

Agreed, I wasn't 100% sure either.

I double checked with Tejun, he says it's only needed if the work 
queue is directly used in memory reclaim paths, like writing pages 
out to swap and such.

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