From: "Chen, Kenneth W" <kenneth.w.chen@intel.com>
To: linux-ia64@vger.kernel.org
Subject: [patch 1/6] align kenrel rbs on 128 byte
Date: Tue, 31 Jan 2006 08:48:28 +0000 [thread overview]
Message-ID: <200601310848.k0V8mbg11087@unix-os.sc.intel.com> (raw)
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 <kenneth.w.chen@intel.com>
--- ./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
next reply other threads:[~2006-01-31 8:48 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-01-31 8:48 Chen, Kenneth W [this message]
2006-01-31 8:57 ` [patch 1/6] align kenrel rbs on 128 byte Keith Owens
2006-01-31 9:42 ` Chen, Kenneth W
2006-01-31 10:15 ` Andreas Schwab
2006-01-31 11:00 ` Jes Sorensen
2006-01-31 15:26 ` Russ Anderson
2006-01-31 16:25 ` Chen, Kenneth W
2006-01-31 19:58 ` Richard Harke
2006-01-31 19:59 ` Chen, Kenneth W
2006-01-31 20:16 ` Richard Harke
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