Hi Steven,
On Mon, Apr 01, 2019 at 09:41:09AM -0400, Steven Rostedt wrote:
> From: "Steven Rostedt (Red Hat)" <rost...@goodmis.org>
>
> At Linux Plumbers, Andy Lutomirski approached me and pointed out that the
> function call syscall_get_arguments() implemented in x86 was horribly
> written and not optimized for the standard case of passing in 0 and 6 for
> the starting index and the number of system calls to get. When looking at
> all the users of this function, I discovered that all instances pass in only
> 0 and 6 for these arguments. Instead of having this function handle
> different cases that are never used, simply rewrite it to return the first 6
> arguments of a system call.
>
> This should help out the performance of tracing system calls by ptrace,
> ftrace and perf.
>
> Link: http://lkml.kernel.org/r/20161107213233.754809...@goodmis.org
>
> Cc: Oleg Nesterov <o...@redhat.com>
> Cc: Thomas Gleixner <t...@linutronix.de>
> Cc: Kees Cook <keesc...@chromium.org>
> Cc: Andy Lutomirski <l...@amacapital.net>
> Cc: Dominik Brodowski <li...@dominikbrodowski.net>
> Cc: Dave Martin <dave.mar...@arm.com>
> Cc: "Dmitry V. Levin" <l...@altlinux.org>
> Cc: x...@kernel.org
> Cc: linux-snps-arc@lists.infradead.org
> Cc: linux-ker...@vger.kernel.org
> Cc: linux-arm-ker...@lists.infradead.org
> Cc: linux-c6x-...@linux-c6x.org
> Cc: uclinux-h8-de...@lists.sourceforge.jp
> Cc: linux-hexa...@vger.kernel.org
> Cc: linux-i...@vger.kernel.org
> Cc: linux-m...@vger.kernel.org
> Cc: nios2-...@lists.rocketboards.org
> Cc: openr...@lists.librecores.org
> Cc: linux-par...@vger.kernel.org
> Cc: linuxppc-...@lists.ozlabs.org
> Cc: linux-ri...@lists.infradead.org
> Cc: linux-s...@vger.kernel.org
> Cc: linux...@vger.kernel.org
> Cc: sparcli...@vger.kernel.org
> Cc: linux...@lists.infradead.org
> Cc: linux-xte...@linux-xtensa.org
> Cc: linux-a...@vger.kernel.org
> Reported-by: Andy Lutomirski <l...@amacapital.net>
> Signed-off-by: Steven Rostedt (VMware) <rost...@goodmis.org>
Acked-by: Paul Burton <paul.bur...@mips.com> # MIPS parts
Thanks,
Paul
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