From: Andi Kleen <ak@linux.intel.com>
To: Andy Lutomirski <luto@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>,
Tim Chen <tim.c.chen@linux.intel.com>,
Arjan van de Ven <arjan@linux.intel.com>,
LKML <linux-kernel@vger.kernel.org>,
KarimAllah Ahmed <karahmed@amazon.de>,
Andrea Arcangeli <aarcange@redhat.com>,
Ashok Raj <ashok.raj@intel.com>,
Asit Mallick <asit.k.mallick@intel.com>,
Borislav Petkov <bp@suse.de>,
Dan Williams <dan.j.williams@intel.com>,
Dave Hansen <dave.hansen@intel.com>,
David Woodhouse <dwmw@amazon.co.uk>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
"H . Peter Anvin" <hpa@zytor.com>,
Ingo Molnar <mingo@redhat.com>,
Janakarajan Natarajan <Janakarajan.Natarajan@amd.com>,
Joerg Roedel <joro@8bytes.org>,
Jun Nakajima <jun.nakajima@intel.com>
Subject: Re: [RFC PATCH 1/2] x86/ibpb: Skip IBPB when we switch back to same user process
Date: Thu, 25 Jan 2018 13:57:49 -0800 [thread overview]
Message-ID: <87h8r9k3du.fsf@linux.intel.com> (raw)
In-Reply-To: <CALCETrUGDeHse24sOygh5EcsXuZHPtZnw3adhzADfn+yKgcOzg@mail.gmail.com> (Andy Lutomirski's message of "Thu, 25 Jan 2018 13:04:23 -0800")
Andy Lutomirski <luto@kernel.org> writes:
>
> That being said, just stashing last_user_mm without any refcounting
> should be fine.
If last_user_mm is freed and reallocated by a different process,
then that would miss the IPBP incorrectly.
-Andi
next prev parent reply other threads:[~2018-01-25 21:57 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-01-25 0:36 [RFC PATCH 1/2] x86/ibpb: Skip IBPB when we switch back to same user process Tim Chen
2018-01-25 0:36 ` [RFC PATCH 2/2] x86/ibpb: Prevent missed IBPB flush Tim Chen
2018-01-25 8:20 ` David Woodhouse
2018-01-25 16:56 ` Tim Chen
2018-01-25 8:58 ` [RFC PATCH 1/2] x86/ibpb: Skip IBPB when we switch back to same user process Peter Zijlstra
2018-01-25 9:22 ` Peter Zijlstra
2018-01-25 13:21 ` Arjan van de Ven
2018-01-25 13:50 ` Peter Zijlstra
2018-01-25 14:07 ` Arjan van de Ven
2018-01-25 16:41 ` Peter Zijlstra
2018-01-25 17:04 ` Andy Lutomirski
2018-01-25 18:18 ` Peter Zijlstra
2018-01-25 19:32 ` Tim Chen
2018-01-25 19:34 ` Arjan van de Ven
2018-01-25 19:45 ` Dave Hansen
2018-01-25 20:46 ` Peter Zijlstra
2018-01-25 21:04 ` Andy Lutomirski
2018-01-25 21:57 ` Andi Kleen [this message]
2018-01-25 22:01 ` Andy Lutomirski
2018-01-25 23:07 ` Tim Chen
2018-01-26 0:01 ` Peter Zijlstra
2018-01-25 17:24 ` Arjan van de Ven
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