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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /include/asm-ia64/shmparam.h
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Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'include/asm-ia64/shmparam.h')
-rw-r--r--include/asm-ia64/shmparam.h12
1 files changed, 12 insertions, 0 deletions
diff --git a/include/asm-ia64/shmparam.h b/include/asm-ia64/shmparam.h
new file mode 100644
index 000000000000..d07508dc54ae
--- /dev/null
+++ b/include/asm-ia64/shmparam.h
@@ -0,0 +1,12 @@
+#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 */