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-rw-r--r--arch/ia64/include/asm/shmparam.h13
1 files changed, 13 insertions, 0 deletions
diff --git a/arch/ia64/include/asm/shmparam.h b/arch/ia64/include/asm/shmparam.h
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+++ b/arch/ia64/include/asm/shmparam.h
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+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _ASM_IA64_SHMPARAM_H
+#define _ASM_IA64_SHMPARAM_H
+
+/*
+ * SHMLBA controls minimum alignment at which shared memory segments
+ * get attached. The IA-64 architecture says that there may be a
+ * performance degradation when there are virtual aliases within 1MB.
+ * To reduce the chance of this, we set SHMLBA to 1MB. --davidm 00/12/20
+ */
+#define SHMLBA (1024*1024)
+
+#endif /* _ASM_IA64_SHMPARAM_H */