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R. Silva" , Peter Zijlstra , Palmer Dabbelt , Dominik Brodowski , Oleg Nesterov , "H. Peter Anvin" , "sparclinux@vger.kernel.org" , "linux-riscv@lists.infradead.org" , Ingo Molnar , "linux-arch@vger.kernel.org" , "linux-s390@vger.kernel.org" , "linux-c6x-dev@linux-c6x.org" , "linux-sh@vger.kernel.org" , "linux-hexagon@vger.kernel.org" , "x86@kernel.org" , Ingo Molnar , "linux-snps-arc@lists.infradead.org" , Dave Martin , "uclinux-h8-devel@lists.sourceforge.jp" , "linux-xtensa@linux-xtensa.org" , Kees Cook , Roland McGrath , "linux-um@lists.infradead.org" , "linux-mips@vger.kernel.org" , "openrisc@lists.librecores.org" , Borislav Petkov , Andy Lutomirski , Thomas Gleixner , "Dmitry V. Levin" , "linux-arm-kernel@lists.infradead.org" , "linux-parisc@vger.kernel.org" , "linuxppc-dev@lists.ozlabs.org" , "linux-kernel@vger.kernel.org" , Andy Lutomirski , "Eric W. Biederman" , "nios2-dev@lists.rocketboards.org" , Andrew Morton , Linus Torvalds Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-riscv" Errors-To: linux-riscv-bounces+infradead-linux-riscv=archiver.kernel.org@lists.infradead.org Hi Steven, On Mon, Apr 01, 2019 at 09:41:09AM -0400, Steven Rostedt wrote: > From: "Steven Rostedt (Red Hat)" > > 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/20161107213233.754809394@goodmis.org > > Cc: Oleg Nesterov > Cc: Thomas Gleixner > Cc: Kees Cook > Cc: Andy Lutomirski > Cc: Dominik Brodowski > Cc: Dave Martin > Cc: "Dmitry V. Levin" > Cc: x86@kernel.org > Cc: linux-snps-arc@lists.infradead.org > Cc: linux-kernel@vger.kernel.org > Cc: linux-arm-kernel@lists.infradead.org > Cc: linux-c6x-dev@linux-c6x.org > Cc: uclinux-h8-devel@lists.sourceforge.jp > Cc: linux-hexagon@vger.kernel.org > Cc: linux-ia64@vger.kernel.org > Cc: linux-mips@vger.kernel.org > Cc: nios2-dev@lists.rocketboards.org > Cc: openrisc@lists.librecores.org > Cc: linux-parisc@vger.kernel.org > Cc: linuxppc-dev@lists.ozlabs.org > Cc: linux-riscv@lists.infradead.org > Cc: linux-s390@vger.kernel.org > Cc: linux-sh@vger.kernel.org > Cc: sparclinux@vger.kernel.org > Cc: linux-um@lists.infradead.org > Cc: linux-xtensa@linux-xtensa.org > Cc: linux-arch@vger.kernel.org > Reported-by: Andy Lutomirski > Signed-off-by: Steven Rostedt (VMware) Acked-by: Paul Burton # MIPS parts Thanks, Paul _______________________________________________ linux-riscv mailing list linux-riscv@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-riscv