netdev - Re: [Bug 106241] New: shutdown(3)/close(3) behaviour is incorrect for sockets in accept(3)

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Message-ID: <1446043677.7476.68.camel@edumazet-glaptop2.roam.corp.google.com>
Date:	Wed, 28 Oct 2015 07:47:57 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Al Viro <viro@...IV.linux.org.uk>
Cc:	David Miller <davem@...emloft.net>, stephen@...workplumber.org,
	netdev@...r.kernel.org,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	dhowells@...hat.com, linux-fsdevel@...r.kernel.org
Subject: Re: [Bug 106241] New: shutdown(3)/close(3) behaviour is incorrect
 for sockets in accept(3)

On Wed, 2015-10-28 at 06:24 -0700, Eric Dumazet wrote:

> Before I take a deep look at your suggestion, are you sure plain use of
> include/linux/percpu-refcount.h infra is not possible for struct cred ?

BTW, I am not convinced we need to spend so much energy and per-cpu
memory for struct cred refcount.

The big problem is fd array spinlock of course and bitmap search for
POSIX compliance.

The cache line trashing in struct cred is a minor one ;)



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