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Date: Fri, 01 Aug 2014 11:35:13 -0700
From: "H. Peter Anvin" <hpa@zytor.com>
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To: Denys Vlasenko <dvlasenk@redhat.com>, linux-kernel@vger.kernel.org
CC: Oleg Nesterov <oleg@redhat.com>, Andy Lutomirski <luto@amacapital.net>,
        Frederic Weisbecker <fweisbec@gmail.com>, X86 ML <x86@kernel.org>,
        Alexei Starovoitov <ast@plumgrid.com>, Will Drewry <wad@chromium.org>,
        Kees Cook <keescook@chromium.org>
Subject: Re: [PATCH 4/5] x86: entry_64.S: always allocate complete "struct
 pt_regs"
References: <1406904498-21647-1-git-send-email-dvlasenk@redhat.com> <1406904498-21647-4-git-send-email-dvlasenk@redhat.com>
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On 08/01/2014 07:48 AM, Denys Vlasenko wrote:
> 
> Patch was run-tested: 64-bit executables, 32-bit executables,
> strace works.
> 

Could you please try to see if there is a measurable change in the
latency of a trivial syscall?

	-hpa