netdev - Re: [PATCH 2/2] sctp: implement memory accounting on rx path

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Date:   Wed, 6 May 2020 08:47:17 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     ashwin-h <ashwinh@...are.com>
Cc:     vyasevich@...il.com, nhorman@...driver.com, davem@...emloft.net,
        linux-sctp@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, srivatsab@...are.com,
        srivatsa@...il.mit.edu, rostedt@...dmis.org, srostedt@...are.com,
        ashwin.hiranniah@...il.com, Xin Long <lucien.xin@...il.com>
Subject: Re: [PATCH 2/2] sctp: implement memory accounting on rx path

On Wed, May 06, 2020 at 07:50:54PM +0530, ashwin-h wrote:
> From: Xin Long <lucien.xin@...il.com>
> 
> commit 9dde27de3e5efa0d032f3c891a0ca833a0d31911 upstream.
> 
> sk_forward_alloc's updating is also done on rx path, but to be consistent
> we change to use sk_mem_charge() in sctp_skb_set_owner_r().
> 
> In sctp_eat_data(), it's not enough to check sctp_memory_pressure only,
> which doesn't work for mem_cgroup_sockets_enabled, so we change to use
> sk_under_memory_pressure().
> 
> When it's under memory pressure, sk_mem_reclaim() and sk_rmem_schedule()
> should be called on both RENEGE or CHUNK DELIVERY path exit the memory
> pressure status as soon as possible.
> 
> Note that sk_rmem_schedule() is using datalen to make things easy there.
> 
> Reported-by: Matteo Croce <mcroce@...hat.com>
> Tested-by: Matteo Croce <mcroce@...hat.com>
> Acked-by: Neil Horman <nhorman@...driver.com>
> Acked-by: Marcelo Ricardo Leitner <marcelo.leitner@...il.com>
> Signed-off-by: Xin Long <lucien.xin@...il.com>
> Signed-off-by: David S. Miller <davem@...emloft.net>
> Signed-off-by: Ashwin H <ashwinh@...are.com>
> ---
>  include/net/sctp/sctp.h |  2 +-
>  net/sctp/sm_statefuns.c |  6 ++++--
>  net/sctp/ulpevent.c     | 19 ++++++++-----------
>  net/sctp/ulpqueue.c     |  3 ++-
>  4 files changed, 15 insertions(+), 15 deletions(-)

<formletter>

This is not the correct way to submit patches for inclusion in the
stable kernel tree.  Please read:
    https://www.kernel.org/doc/html/latest/process/stable-kernel-rules.html
for how to do this properly.

</formletter>