From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Chen, Kenneth W" Date: Tue, 31 Jan 2006 08:48:28 +0000 Subject: [patch 1/6] align kenrel rbs on 128 byte Message-Id: <200601310848.k0V8mbg11087@unix-os.sc.intel.com> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: linux-ia64@vger.kernel.org The bottom of kernel rbs stack is the memory used to spill user dirty stack register partition when entering the kernel. This space is heavily used on every kernel entry and exit. It deserve having its own dedicated cache line and not to share with tail end of thread_info which is not used heavily. Align the bottom of kernel rbs stack to 128 byte boundary. Signed-off-by: Ken Chen --- ./include/asm-ia64/ptrace.h.orig 2006-01-19 16:45:49.695591377 -0800 +++ ./include/asm-ia64/ptrace.h 2006-01-20 02:24:05.985205410 -0800 @@ -75,7 +75,7 @@ # define KERNEL_STACK_SIZE_ORDER 0 #endif -#define IA64_RBS_OFFSET ((IA64_TASK_SIZE + IA64_THREAD_INFO_SIZE + 15) & ~15) +#define IA64_RBS_OFFSET ((IA64_TASK_SIZE + IA64_THREAD_INFO_SIZE + 127) & ~127) #define IA64_STK_OFFSET ((1 << KERNEL_STACK_SIZE_ORDER)*PAGE_SIZE) #define KERNEL_STACK_SIZE IA64_STK_OFFSET