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Message-ID: <20190329173723.GB23683@redhat.com>
Date: Fri, 29 Mar 2019 18:37:23 +0100
From: Oleg Nesterov <oleg@...hat.com>
To: Joel Fernandes <joel@...lfernandes.org>
Cc: Jann Horn <jannh@...gle.com>, Kees Cook <keescook@...omium.org>,
"Eric W. Biederman" <ebiederm@...ssion.com>,
LKML <linux-kernel@...r.kernel.org>,
Android Kernel Team <kernel-team@...roid.com>,
Kernel Hardening <kernel-hardening@...ts.openwall.com>,
Andrew Morton <akpm@...ux-foundation.org>,
Matthew Wilcox <willy@...radead.org>,
Michal Hocko <mhocko@...e.com>,
"Reshetova, Elena" <elena.reshetova@...el.com>
Subject: Re: [PATCH] Convert struct pid count to refcount_t
On 03/28, Joel Fernandes wrote:
>
> Also Oleg, why not just call refcount_dec_and_test like below?
Of course we can, this is just optimization to avoid the atomic op if possible.
Does this optimization really help? I have no idea ;)
But as you can see, it surely helps to provoke the interesting discussions!
Oleg.
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