netdev - Re: [External] Re: [PATCH] mm: proc: add Sock to /proc/meminfo

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Message-ID: <20201013151215.GG4251@kernel.org>
Date:   Tue, 13 Oct 2020 18:12:15 +0300
From:   Mike Rapoport <rppt@...nel.org>
To:     Randy Dunlap <rdunlap@...radead.org>
Cc:     Muchun Song <songmuchun@...edance.com>,
        Eric Dumazet <eric.dumazet@...il.com>,
        Eric Dumazet <edumazet@...gle.com>,
        Cong Wang <xiyou.wangcong@...il.com>,
        Greg KH <gregkh@...uxfoundation.org>, rafael@...nel.org,
        "Michael S. Tsirkin" <mst@...hat.com>,
        Jason Wang <jasowang@...hat.com>,
        David Miller <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Alexey Dobriyan <adobriyan@...il.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Alexey Kuznetsov <kuznet@....inr.ac.ru>,
        Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
        Steffen Klassert <steffen.klassert@...unet.com>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        Shakeel Butt <shakeelb@...gle.com>,
        Will Deacon <will@...nel.org>, Michal Hocko <mhocko@...e.com>,
        Roman Gushchin <guro@...com>, Neil Brown <neilb@...e.de>,
        Sami Tolvanen <samitolvanen@...gle.com>,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        Feng Tang <feng.tang@...el.com>,
        Paolo Abeni <pabeni@...hat.com>,
        Willem de Bruijn <willemb@...gle.com>,
        Florian Westphal <fw@...len.de>, gustavoars@...nel.org,
        Pablo Neira Ayuso <pablo@...filter.org>,
        Dexuan Cui <decui@...rosoft.com>,
        Jakub Sitnicki <jakub@...udflare.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Christian Brauner <christian.brauner@...ntu.com>,
        "Eric W. Biederman" <ebiederm@...ssion.com>,
        Thomas Gleixner <tglx@...utronix.de>, dave@...olabs.net,
        Michel Lespinasse <walken@...gle.com>,
        Jann Horn <jannh@...gle.com>, chenqiwu@...omi.com,
        christophe.leroy@....fr, Minchan Kim <minchan@...nel.org>,
        Martin KaFai Lau <kafai@...com>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Miaohe Lin <linmiaohe@...wei.com>,
        Kees Cook <keescook@...omium.org>,
        LKML <linux-kernel@...r.kernel.org>,
        virtualization@...ts.linux-foundation.org,
        Linux Kernel Network Developers <netdev@...r.kernel.org>,
        linux-fsdevel <linux-fsdevel@...r.kernel.org>,
        linux-mm <linux-mm@...ck.org>,
        Michael Kerrisk <mtk.manpages@...il.com>
Subject: Re: [External] Re: [PATCH] mm: proc: add Sock to /proc/meminfo

On Tue, Oct 13, 2020 at 07:43:59AM -0700, Randy Dunlap wrote:
> On 10/13/20 1:09 AM, Mike Rapoport wrote:
> > On Mon, Oct 12, 2020 at 05:53:01PM +0800, Muchun Song wrote:
> >> On Mon, Oct 12, 2020 at 5:24 PM Eric Dumazet <eric.dumazet@...il.com> wrote:
> >>>
> >>> On 10/12/20 10:39 AM, Muchun Song wrote:
> >>>> On Mon, Oct 12, 2020 at 3:42 PM Eric Dumazet <edumazet@...gle.com> wrote:
> >>
> >> We are not complaining about TCP using too much memory, but how do
> >> we know that TCP uses a lot of memory. When I firstly face this problem,
> >> I do not know who uses the 25GB memory and it is not shown in the /proc/meminfo.
> >> If we can know the amount memory of the socket buffer via /proc/meminfo, we
> >> may not need to spend a lot of time troubleshooting this problem. Not everyone
> >> knows that a lot of memory may be used here. But I believe many people
> >> should know /proc/meminfo to confirm memory users.
> > 
> > If I undestand correctly, the problem you are trying to solve is to
> > simplify troubleshooting of memory usage for people who may not be aware
> > that networking stack can be a large memory consumer.
> > 
> > For that a paragraph in 'man 5 proc' maybe a good start:
> > 
> >>From ddbcf38576d1a2b0e36fe25a27350d566759b664 Mon Sep 17 00:00:00 2001
> > From: Mike Rapoport <rppt@...ux.ibm.com>
> > Date: Tue, 13 Oct 2020 11:07:35 +0300
> > Subject: [PATCH] proc.5: meminfo: add not anout network stack memory
> >  consumption
> > 
> > Signed-off-by: Mike Rapoport <rppt@...ux.ibm.com>
> > ---
> >  man5/proc.5 | 8 ++++++++
> >  1 file changed, 8 insertions(+)
> > 
> > diff --git a/man5/proc.5 b/man5/proc.5
> > index ed309380b..8414676f1 100644
> > --- a/man5/proc.5
> > +++ b/man5/proc.5
> > @@ -3478,6 +3478,14 @@ Except as noted below,
> >  all of the fields have been present since at least Linux 2.6.0.
> >  Some fields are displayed only if the kernel was configured
> >  with various options; those dependencies are noted in the list.
> > +.IP
> > +Note that significant part of memory allocated by the network stack
> > +is not accounted in the file.
> > +The memory consumption of the network stack can be queried
> > +using
> > +.IR /proc/net/sockstat
> > +or
> > +.BR ss (8)
> >  .RS
> >  .TP
> >  .IR MemTotal " %lu"
> 
> Hi Mike,
> 
> Could you tell us what units those values are in?
> or is that already explained somewhere else?

It is described a few lines above and anyway, "MemTotal" is a part of
the diff context ;-)

> thanks.
> -- 
> ~Randy
> 
> 

-- 
Sincerely yours,
Mike.