netdev - Re: [PATCH v2 0/2] net/sctp: Avoid allocating high order memory with kmalloc()

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Message-ID: <20180803203009.GG5482@localhost.localdomain>
Date:   Fri, 3 Aug 2018 17:30:09 -0300
From:   Marcelo Ricardo Leitner <marcelo.leitner@...il.com>
To:     David Laight <David.Laight@...lab.com>
Cc:     'Konstantin Khorenko' <khorenko@...tuozzo.com>,
        "oleg.babin@...il.com" <oleg.babin@...il.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-sctp@...r.kernel.org" <linux-sctp@...r.kernel.org>,
        "David S . Miller" <davem@...emloft.net>,
        Vlad Yasevich <vyasevich@...il.com>,
        Neil Horman <nhorman@...driver.com>,
        Xin Long <lucien.xin@...il.com>,
        Andrey Ryabinin <aryabinin@...tuozzo.com>,
        Michael Tuexen <michael.tuexen@...chi.franken.de>
Subject: Re: [PATCH v2 0/2] net/sctp: Avoid allocating high order memory with
 kmalloc()

On Fri, Aug 03, 2018 at 04:43:28PM +0000, David Laight wrote:
> From: Konstantin Khorenko
> > Sent: 03 August 2018 17:21
> > 
> > Each SCTP association can have up to 65535 input and output streams.
> > For each stream type an array of sctp_stream_in or sctp_stream_out
> > structures is allocated using kmalloc_array() function. This function
> > allocates physically contiguous memory regions, so this can lead
> > to allocation of memory regions of very high order, i.e.:
> ...
> 
> Given how useless SCTP streams are, does anything actually use
> more than about 4?

Maybe Michael can help us with that. I'm also curious now.

  Marcelo