From: Arjan van de Ven <arjan@linux.intel.com>
To: Tim Chen <tim.c.chen@linux.intel.com>,
Peter Zijlstra <peterz@infradead.org>,
Andy Lutomirski <luto@kernel.org>
Cc: LKML <linux-kernel@vger.kernel.org>,
KarimAllah Ahmed <karahmed@amazon.de>,
Andi Kleen <ak@linux.intel.com>,
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>,
Laura Abbott <labbott@redhat.com>,
Linus Torvalds <torvalds@linux-foundation.org>,
Masami Hiramatsu <mhiramat@kernel.org>,
Paolo Bonzini <pbonzini@redhat.com>,
Radim Krcmar <rkrcmar@redhat.com>,
Thomas Gleixner <tglx@linutronix.de>,
Tom Lendacky <thomas.lendacky@amd.com>, X86 ML <x86@kernel.org>
Subject: Re: [RFC PATCH 1/2] x86/ibpb: Skip IBPB when we switch back to same user process
Date: Thu, 25 Jan 2018 11:34:13 -0800 [thread overview]
Message-ID: <679180a8-cd7c-9200-224e-a93f0af77db7@linux.intel.com> (raw)
In-Reply-To: <aa7cfe53-d8ee-9f56-a5c7-775d878cee15@linux.intel.com>
>
> This patch tries to address the case when we do switch to init_mm and back.
> Do you still have objections to the approach in this patch
> to save the last active mm before switching to init_mm?
how do you know the last active mm did not go away and started a new process with new content?
(other than taking a reference which has other side effects)
next prev parent reply other threads:[~2018-01-25 19:34 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 [this message]
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
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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