From: Mel Gorman <mgorman@techsingularity.net>
To: Xie He <xie.he.0141@gmail.com>
Cc: Mel Gorman <mgorman@suse.de>,
jslaby@suse.cz, Neil Brown <neilb@suse.de>,
Peter Zijlstra <a.p.zijlstra@chello.nl>,
Mike Christie <michaelc@cs.wisc.edu>,
Eric B Munson <emunson@mgebm.net>,
Eric Dumazet <eric.dumazet@gmail.com>,
Sebastian Andrzej Siewior <sebastian@breakpoint.cc>,
Christoph Lameter <cl@linux.com>,
Andrew Morton <akpm@linux-foundation.org>,
"David S. Miller" <davem@davemloft.net>,
Jakub Kicinski <kuba@kernel.org>,
Linux Kernel Network Developers <netdev@vger.kernel.org>,
LKML <linux-kernel@vger.kernel.org>
Subject: Re: Problem in pfmemalloc skb handling in net/core/dev.c
Date: Fri, 9 Apr 2021 08:30:46 +0100 [thread overview]
Message-ID: <20210409073046.GI3697@techsingularity.net> (raw)
In-Reply-To: <CAJht_ENNvG=VrD_Z4w+G=4_TCD0Rv--CQAkFUrHWTh4Cz_NT2Q@mail.gmail.com>
On Thu, Apr 08, 2021 at 11:52:01AM -0700, Xie He wrote:
> Hi Mel Gorman,
>
> I may have found a problem in pfmemalloc skb handling in
> net/core/dev.c. I see there are "if" conditions checking for
> "sk_memalloc_socks() && skb_pfmemalloc(skb)", and when the condition
> is true, the skb is handled specially as a pfmemalloc skb, otherwise
> it is handled as a normal skb.
>
> However, if "sk_memalloc_socks()" is false and "skb_pfmemalloc(skb)"
> is true, the skb is still handled as a normal skb. Is this correct?
Under what circumstances do you expect sk_memalloc_socks() to be false
and skb_pfmemalloc() to be true that would cause a problem?
--
Mel Gorman
SUSE Labs
next prev parent reply other threads:[~2021-04-09 7:30 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-04-08 18:52 Problem in pfmemalloc skb handling in net/core/dev.c Xie He
2021-04-09 7:30 ` Mel Gorman [this message]
2021-04-09 8:33 ` Xie He
2021-04-09 8:44 ` Mel Gorman
2021-04-09 9:14 ` Xie He
2021-04-09 9:58 ` Mel Gorman
2021-04-09 10:08 ` Xie He
2021-04-09 10:04 ` Eric Dumazet
2021-04-09 10:14 ` Xie He
2021-04-09 11:50 ` Eric Dumazet
2021-04-09 19:12 ` Xie He
2021-04-12 20:40 ` Xie He
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